MNP Ecology Center

The Regions Forests ForestService

Sun, 18 Sep 2011 04:22:54 GMT

Biotic factors influencing the forest involve animals insects, birds, mammals, etc. , plants fungi, competing vegetation, etc. , and, of course, the trees themselves. In this book, trees are our principal concern, though other biotic components play significant roles in the development of forests. More than 60 forest-cover types have been recognized by the Society of American Foresters as occurring in the South. These are generally grouped into nine classes. The oak-hickory-pine type, the most...

Indirect Negative Effects SoilEcology

Fri, 16 Sep 2011 04:01:29 GMT

FIGURE 2.6. Schematic representation of the positive and negative direct and indirect effects of root exudates on plant growth from Jones et al., 2003 . molecular-weight mucilage secreted by the root cap, III cell-wall breakdown products resulting from separation of thousands of border cells from each other and the root cap, IV other extracellular products secreted by the cap, V other extracellular products secreted by the border cells from Farrar et al., 2003 . molecular-weight mucilage...

The Editors InsectSounds

Fri, 02 Sep 2011 10:26:38 GMT

Sakis Drosopoulos Ph.D. is Professor of Systematics and Biosystematics in the Department of Agricultural Biotechnology of the Agricultural University of Athens. Since 1972 his research has focused on two topics first faunistic and floristic investigations on phytophageous Hemiptera and second biosystematics ecology, ethology, genetics of species complexes, which are difficult to separate only by pure morphological characters. All these still ongoing studies led him to develop his own ideas on...

references and suggested reading Microbiology

Wed, 31 Aug 2011 20:27:38 GMT

Aiken, G. R., McKnight, D. M., Wershaw, R. L., and MacCarthy, P. 1985 . Humic Substances in Soil, Sediment and Water. Wiley, New York. Alef, K., and Nanipieri, P. 1995 . Methods in Applied Soil Microbiology and Biochemistry. Academic Press, London. Alexander, M. 1961, 1977 . Introduction to Soil Microbiology. 2nd ed. Wiley, New York. Atlas, R. M. 1984 . Microbiology Fundamentals and Application. Macmillan, New York. Bada, J. L., and Lazcano, A. 2003 . Prebiotic soup revisiting the Miller...

Waste Minimization WastewaterTreatment

Wed, 31 Aug 2011 06:24:09 GMT

In waste minimization, the objective is to make a process more efficient in its use of raw materials. This objective is achieved through improvements in the reaction and separation systems within the process. Because these systems often require the addition or removal of heat, a design engineer can use pinch technology to identify the cost-effective process modifications. The following example from a fine chemical plant illustrates this use Rossiter, Rutkowski, and McMullen 1991 . Figure 3.11.8...

Competitive Exclusion Population Dynamics 2

Mon, 29 Aug 2011 05:05:30 GMT

Historical development of the niche theory is very closely related to one of the most important topics of ecology, that is, the problem of species competition and coexistence. Since the beginning of the ecological niche concept, it has been assumed that no two species sharing a single niche could locally coexist. Originally, the later Volterra-Gause principle states that ''under constant conditions, no two species utilizing, and limited by, a single resource can coexist in a limited system''...

Description of the Pattern and Timing of Flowering HeracleumMantegazzianum

Mon, 29 Aug 2011 04:25:13 GMT

Flowering plants of H. mantegazzianum have a distinct architecture. The inflorescences are compound umbels of four orders. The main flowering shoot develops as a leafy stem that terminates in a primary first-order umbel, also called 'terminal'. Lateral shoots, which are produced on the stem, terminate in secondary second-order umbels and can be found in a satellite position, surrounding the primary umbel hereafter also called 'satellites' , or in a branch position below them on the stem...

CWs with Duckweed Population Dynamics 2

Sun, 28 Aug 2011 15:26:34 GMT

Duckweeds are tiny free-floating vascular plants with worldwide distribution. Their communities occur, as a rule, in small water bodies, namely in fishponds, ditches, or lagoons. The family Lemnaceae consists of about 35 species in four genera, Lemna, Spirodela, Wolfiella, and Wolffia. Duckweeds are among the fastest growing plants in the world, frequently doubling their biomass under optimal conditions in 2 or 3 days with night growth equaling or exceeding day growth for some species....

Ecology of flea locomotion FleaSpecies

Fri, 26 Aug 2011 14:26:44 GMT

The locomotory patterns of fleas reflect their way of life as parasites of fur- or feather-covered hosts. Fleas are able to move through dense host pelage and withstand the host's anti-parasitic grooming. They also are able to jump, to move through the substrate of a host's burrow or nest and to move on vertical surfaces e.g. fleas parasitic on bats . Here, I briefly review the morphological and physiological aspects of flea locomotory features that facilitate the successful exploitation of...

Wing Reduction and Flightlessness CockroachSpecies

Wed, 24 Aug 2011 18:42:36 GMT

All taxonomic groups of cockroaches include species with variably reduced or absent tegmina and hindwings, ex posing all or part of the dorsal surface of the abdomen. The exceptions are those groups in which the distal portion of the hindwing is set off by a transverse fold e.g., Diplopterinae, Ectobiinae, Anaplectinae Rehn, 1951 . Wing reduction typically affects the hindwings more than the tegmina Peck and Roth, 1992 . Even when they are reduced, wings are always flexibly joined to the...

What Is Ecological Engineering Population Dynamics 2

Wed, 24 Aug 2011 16:10:23 GMT

The most used definition of ecological engineering employs the following formulation ecological engineering is defined as the design of sustainable natural and artificial ecosystems that integrate human society with its natural environment for the benefit of both. It requires, on the one hand, that we understand nature and ensure a sustainable development of natural resources and ecosystems and, on the other hand, that we make use but not abuse of natural resources to the benefit of the human...

Contributors VectorControl

Tue, 23 Aug 2011 12:10:29 GMT

Assaf Anyamba Goddard Space Flight Center, Biospheric Sciences Branch, Greenbelt, MD 20771, USA, Assaf ltpmail.gsfc.nasa.gov Peter W. Atkinson Department of Entomology, Center for Disease Vectors Research, University of California, Riverside, CA 92521, USA, peter.atkinson ucr.edu Barry J. Beaty Arthropod-Borne and Infectious Diseases Laboratory, Colorado State University, Fort Collins, CO 80523, USA, bbeaty colostate.edu Norbert Becker University of Heidelberg, German Mosquito Control...

Info Eyz TreeHoles

Sat, 20 Aug 2011 20:17:45 GMT

occur within them, and the sometimes curious and always interesting ecological interactions and other processes which occur within them form a legitimate base for their continued study. But with the extension of community ecology from the descriptive to the predictive stage that has occurred in recent years, phytotelm studies have come to play a much more central role Pimm 1982, Young 1997 . The multitude of ideas on how natural communities have developed through evolutionary time, how they...

Earthworms phylum Annelida Clitellata Oligochaeta SoilSolution

Fri, 19 Aug 2011 19:17:08 GMT

There are gt 7000 species known from aquatic and terrestrial habitats, and a small number of species are known to inhabit marine sediments. Most species belong to about 20 families adapted for a terrestrial interstitial habitat. Their distribution is limited by absence of soil organic matter and litter on which they feed. They are absent or rare in arid or cold regions, for climatic as well as nutritional reasons. Their present geographical distribution seems to carry the mark of previous...

In Wood CockroachSpecies

Fri, 19 Aug 2011 13:17:29 GMT

Dead wood is a tremendously diverse resource that varies with plant taxon, size branch to bole , location forest floor to suspended in canopy ,degree and type of rot, orientation standing versus prone , presence of other invertebrates, and other factors. Cockroach species from Table 3.2. Examples of cockroaches other than Cryptocercidae and Panesthiinae that have been collected from rotted wood. Table 3.2. Examples of cockroaches other than Cryptocercidae and Panesthiinae that have been...

Acclimation Population Dynamics 2

Wed, 17 Aug 2011 14:05:44 GMT

B Demmig-Adams, M R Dumlao, M K Herzenach, and WW Adams III, University of Colorado, Boulder, CO, USA 2008 Elsevier B.V. All rights reserved. Do Plants Have a Particularly High Potential for Acclimation Acclimation Patterns Depend on Species and the Severity of the Environment Principal Types of Adjustments Plant Form, Function, and Lifecycle Acclimation Responses to Specific Environmental Factors Oxidative Stress and Redox Signaling as Common Denominators in Stress Perception and Response...

Appendix Spatial models OptimalControl

Sun, 14 Aug 2011 19:49:37 GMT

Consider a spatially structured environment consisting of a number of patches of suitable habitat embedded in an inhospitable matrix. There is permanent spatial heterogeneity in habitat quality as would occur if there were differences in soil, nutrient availability, or moisture content that would make some host plant patches or ponds more productive than others. These spatial differences are assumed to occur within a spatial scale that can be traversed by the organisms occupying these habitats....

Interaction Matrix And Simple Checklist Methods WastewaterTreatment

Sun, 14 Aug 2011 06:58:39 GMT

Interaction matrices were one of the earliest methods used. The simple matrix refers to a display of project actions or activities along one axis, with appropriate environmental factors listed along the other axis of the matrix. Many variations of the simple interaction matrix have been used in environmental impact studies, including stepped matrices Economic and Social Commission for Asia and the Pacific 1990, Lohani and Halim 1990, and International Institute for Applied Systems Analysis 1979...

List of Authors NitrogenFixation

Thu, 11 Aug 2011 16:17:40 GMT

DAVID G. ADAMS Department of Microbiology, University of Leeds LS2 9JT, UK d.g.adams leeds.ac.uk REDHAH. AL-HASAN Department of Biological Sciences, Faculty of Science, University of Kuwait, PO Box 5969, Safat 13060,Kuwait redha kuc01.kuniv.edu.kw DEVAKIBHAYA Carnegie Institute of Washington, Department of Plant Biology, 260 Panama St, Stanford, CA 94305, USA devaki andrew.stanford.edu CRISTIANA CALLIERI IstitutoItaliano di Idrobiologia,Largo Tonolli 50, 28922 Verbania Pallanza, Italy...

Part 1 1 ThermalInsulation

Wed, 10 Aug 2011 21:10:13 GMT

Raw materials, see Table 1.1. R renewable Matting glued with polyolefin polyester Matting from fresh fibre, glued with polyolefin polyester Note The table is based on many sources, a.o. Kohleret al., 1994 Weibel etal., 1995 Fossdal, 1995 Gielen, 1997 Motzl etal., 2000 Kroghetal., 2001 Pommer et al., 2001 Thormark, 2001 Nemryetal., 2001 Buschmann, 2003 Jochem et al., 2004 MUhlethaler et al., 2006 Hammond et al., 2006 IBO, 2006. Note The table is based on many sources, a.o. Kohleret al., 1994...

Info Rua PlantSpecies

Tue, 09 Aug 2011 21:52:28 GMT

Includes ice, tundra, desert, towns. Includes ice, tundra, desert, towns. Fig. 1.1 Human population 1950-95. The vertical axes are on log scales, a Whole world. b Europe, O Africa. Data from UN Statistics Yearbook 1995. Fig. 1.1 Human population 1950-95. The vertical axes are on log scales, a Whole world. b Europe, O Africa. Data from UN Statistics Yearbook 1995. We should like, if possible, to make things better, for all the people of the world and for the other species in it too. Some topics...

Tools for Characterization and Measurements of Bioavailability Population Dynamics 2

Tue, 09 Aug 2011 21:48:09 GMT

Because bioavailability processes are embedded in ecosystem health risk frameworks, the development of tools that quantitate bioavailability is important. Environmental assessment tools capable of spatially and temporally resolving contaminant variation are important for assessment of exposure frequencies and levels, episodic spills, and natural and anthropogenic remediation. Conventional methods for ecological exposure assessment involve measuring contaminant concentrations in the ambient...

Fire And European Settlement AcornProduction

Tue, 09 Aug 2011 21:10:57 GMT

European settlers continued Indian burning practices but often increased fire frequency and carried fire into more remote areas Pyne 1982, Cronon 1983, Batek et al. 1999 . In general, during the period 1850 to 1930 somewhat earlier in New England and Atlantic coastal areas , when Europeans were busy converting a North American wilderness into farms and villages, fires were the most frequent in the region's history. At the beginning of the twentieth century, fires burned on average every 5 to 6...

Grand Composite Curve WastewaterTreatment

Tue, 09 Aug 2011 16:07:54 GMT

Composite curves show the scope for energy recovery and the hot and cold utility targets. Generally, several utilities at different temperature levels and of different costs are available to a design engineer. Another pinch technology tool, the grand composite curve, helps the design engineer to select the best individual utility or utility mix. The grand composite curve presents the profile of the horizontal enthalpy separation between the composite curves with a built-in allowance for ATmin....

Indicator Organisms Population Dynamics 2

Tue, 09 Aug 2011 15:23:59 GMT

Different classes of indicator organisms are used for 'biological monitoring', where each class may offer a very different response to pollution. Certain organisms have capacity to accumulate pollutants, whereas others are sensitive to the presence of pollutants and react either negatively or positively. Following are some different classes of indicator organisms used in environmental monitoring 1. Sensitive organisms introduced into the environment to test for early warning of pollution, for...

Disruptions To The Coastal Plain ForestService

Tue, 09 Aug 2011 13:43:30 GMT

The Mississippi Delta A physiographic feature that breaks into the general pattern of the Gulf Coastal Plain is the lower alluvial valley of the Mississippi River, called the Delta locally and in forestry literature. It interrupts the prevailing east-west orientation of the Coastal Plain with a north-south strip of alluvial soils bearing distinctive bottomland hardwood forests. Pioneering settlers seemed to have had an understanding of world geography, especially the similarity of the lower...

Thorn Scrub and Cactus Forests TropicalPlants

Tue, 09 Aug 2011 11:55:27 GMT

Examples comparing the physiognomy of a thorn scrub and a cactus forests are shown in Figs. 3.10 and 3.11. The term cactus forest was coined by Vareschi 1980 . Cactus-forests represent an example of thornbush-succulent forests. This type of forest in Madagascar covers a small area in the south-west of the island see Fig. 2.14 dominated by Didieraceae 11 species in 4 genera , Euphorbiaceae and other succulent and deciduous woody species Fig. 3.12 . It is also characteristic of the Caatinga...

Space and noise PredatorPrey

Tue, 09 Aug 2011 11:01:59 GMT

Populations are rarely structured simply by births and deaths the role of space and spatial structure are central to the patterns of distribution and abundance of predators and prey. Although the direct, explicit inclusion of spatial structure is a relatively recent development Giplin and Hanski, 1991 Hanski and Giplin, 1997 Hanski and Gag-giotti, 2004 , a number of early ecological studies argued that space might affect the persistence of different ecological interactions e.g. Nicholson and...

Global Warming An Added Complication LandscapeStructure

Tue, 09 Aug 2011 04:36:13 GMT

Temporal differences in resource abundance and quality have been influenced globally by climate change, and have had significant effects on wildlife species. The Normalized Difference Vegetation Index NDVI provides a standardized method of comparing vegetation greenness between satellite images. When two or more images are compared over several to many years, it is possible to distinguish changes in vegetation reflectance values that can be represented as a percent change from a long-term...

Africa EurasianOtters

Mon, 08 Aug 2011 23:24:01 GMT

Four species, of which the Eurasian otter occurs only along the fringe of the African continent north of the Sahara it has been described under Europe. Cape clawless otter, Aonyx capensis Fig. 2.22 Just below a large dam in South Africa, the Olifants River runs as a beautiful clear, fast flowing stream through arid country, with bushy vegetation and trees along its banks. When, on a sunny early morning, I creep up to one of its rather stagnant channels, there are two clawless otters foraging in...

B Substrate Conditions in Saltwater Wetlands WetlandPlants

Mon, 08 Aug 2011 21:17:55 GMT

A wetland is considered to be brackish or saline if the salt concentration is greater than 0.5 ppt or about 1.4 the concentration of seawater at an average of 35 ppt NaCl . The average concentrations of the most abundant ions in ocean water are 460 mM sodium Na , 50 mM magnesium Mg2 and 540 mM chloride Cl- other ions are relatively scarce. The salinity of soil pore water in saltwater wetlands may be higher or lower than seawater depending on proximity to the tides and on the ratio of...

Pr0 c0Xc072 ThermodynamicEquilibrium

Mon, 08 Aug 2011 20:02:27 GMT

Since the inorganic component, c0, is very dominant at thermodynamic equilibrium, then c0 gt gt Xn 1 c0, and expression 7.2 can be approximated as As a result of the combination of Eqs. 7.1 and 7.3 , we get The equilibrium constant for the process describing the aerobic presence of oxygen decomposition of detritus at 300 K can be found based upon the above-mentioned values. We could presume that the detritus molecular weight is about 100,000 more accurately 104,400 Morowitz, 1968 and its...

Part I Introduction WetlandPlants

Mon, 08 Aug 2011 18:18:52 GMT

Chapter 1 Introduction to Wetland Plants I. Wetlands and Wetland II. What Is a Wetland III. Types of Wetland Plants A. Emergent B. Submerged C. Floating-Leaved D. Floating IV. Wetland Plant V. The Evolution of Wetland Plants A. Changes in Angiosperm Classification and Phylogeny 17 B. Evolutionary Processes in Wetland VI. Threats to Wetland Plant Species A. Hydrologic B. Exotic Species C. Impacts of Global Change D. Threatened and Endangered Species I. Wetland Plant Habitats II. Wetland...

Stratigraphic Nomenclature MolluscaBivalvia

Mon, 08 Aug 2011 16:29:36 GMT

With the development of stratigraphy, it has been found useful to develop a standard method of nomenclature. The Cambrian System consists of rocks deposited during the Cambrian Period. The system consists of rocks while the period is the time during which these rocks were formed. Both terms have an age connotation. Systems are recognized and defined by the fossils they contain. If the fossils within a system can be shown to change regularly with time, systems can be subdivided into series,...

Raptors and other soaring birds BreedingAreas

Mon, 08 Aug 2011 13:13:23 GMT

if they had continued for a fortnight in the same strength as on that day, we could surely have said that they were in greater number than all the men living on the earth. . . . they are seen to pass in this way as thick as ants, and so to continue for many days. Belon 1555 , writing of the migration of Black Kites Milvus migrans on the Black Sea coast. In some large bird species, the spread wings span a large area relative to body weight, and provide good lift in rising air currents. This is...

D Arthropod Defenses InsectEcology

Mon, 08 Aug 2011 12:29:40 GMT

1. Antipredator Defenses Arthropods also use various defenses against predators and parasites. Physical defenses include hardened exoskeleton, spines, claws, and mandibles. Chemical defenses are nearly as varied as plant defenses. Hence, predaceous species also must be capable of evaluating and exploiting defended prey resources. The compounds used by arthropods, including predaceous species, generally belong to the same categories of compounds described previously for plants. Many insect...

VectorField Plots Population Size 2

Mon, 08 Aug 2011 09:57:59 GMT

A drawback of the above phase-plane plots is that they illustrate how the variables change only along certain trajectories e.g., starting at n, 0 n2 0 10 . A more complete visual representation of the dynamics is possible by 1200 Figure 4.15 Vector-field plot for the two-species Lotka-Volterra model of competition. The change over one generation is shown from a series of different starting positions. All of the parameters are the same as in Figure 4,14 with a12 set to 0. The filled circle...

Contributors InsectSounds

Mon, 08 Aug 2011 09:56:12 GMT

School of Animal Biology University of Western Australia Nedlands, Western Australia wbailey cyllene.uwa.edu.au and Behavioral Sciences Faculty of Life Sciences University of Vienna Vienna, Austria Friedrich.G.Barth univie.ac.at EPHE et MNHN Paris, France mbkcicada01 yahoo.fr Department of Entomology Faculty of Biology M. V. Lomonosov Moscow State University Moscow, Russia dt 3.entomol.bio.msu.ru de l'Insecte Universite de Tours Tours, France casas univ-tours.fr Cardiff University Wales, United...

Fungal Morphogenesis FruitBodies

Mon, 08 Aug 2011 08:39:33 GMT

Within the developing tissues of a fruit body, cells embark on a particular course of differentiation in response to the interaction of their intrinsic genetic programme with external physical signals light, temperature, gravity, humidity , and or chemical signals from other regions of the developing structure. These chemicals may be termed organisers, inducers or morphogens, and may inhibit or stimulate entry to particular states of determination. Chemical signals may contribute to a...

Carbon Allocation Costs Of Development And Maintenance Of Symbiotic Associations With Roots SoilEcology

Mon, 08 Aug 2011 08:33:00 GMT

It is difficult to measure apportioning of energy to roots because accurate measurement of belowground NPP entails a number of precautions, as previously noted. Over the last 2 decades, there have been only a few estimates of the carbon costs that have been exacted by the fungal or rhizobial symbiont upon its root partner. The following are two examples of the sorts of measurements that have proven informative. Pate et al. 1979 compared partitioning and utilization of assimilated carbon and...

Bacteriocin Diversity PositiveBacteria

Mon, 08 Aug 2011 07:44:14 GMT

Surveys of colicin diversity in different collections of E. coli all give rise to similar results - only a small fraction of the known colicins are present in a given collection and, in general, different colicins are detected in different collections Riley and Gordon 1996 Table 2.1 . There are a few exceptions to this general trend - colicins E1 and Ia are often observed Riley and Gordon 1996 Table 2.1 . Colicin Ia is encoded on a conjugative plasmid and therefore is able to transfer among E....

Life Cycles Of Zooplankton WaterQuality

Mon, 08 Aug 2011 03:37:23 GMT

In general, the smallest plankton have the shortest life cycles bacteria and flagellates generally multiply within a few hours to one day. Most mesozoo-plankton have life cycles of a few weeks, while the macro- and megaplankton usually have life cycles spanning many months and longer. Many zooplankton spend their entire life cycle as part of the plankton for example, copepods, salps and some jellyfish and are called holo-plankton. The meroplankton, which are seasonally abundant, especially in...

Allomones Population Dynamics 2

Mon, 08 Aug 2011 00:00:55 GMT

Allomones are allelochemicals that evoke in the receiver ofthe signal a behavioral releaser effect or physiological response primer effect that is adaptively favorable to the sender but not the receiver. This definition includes repellent or toxic compounds, which provide defense against attack or infection e.g., secondary plant metabolites , suppressants, which inhibit competitors e.g., antibiotics, allelopathics , and venoms, which poison prey organisms venoms of predatory animals . Another...

Ice And Snow ThermalInsulation

Sun, 07 Aug 2011 20:27:17 GMT

The potential of snow as an insulating material against walls and on roofs has been used in the north throughout history. One of the main reasons for having a grass roof is that in appropriate climates it retains snow for longer. Ice is also a structural building material of interest in colder climates. The former Soviet Republics have a special category of engineering, 'engineering of glaciology' the design of ice structures such as roads and bridges in areas of permafrost. Many of these...

Meromixis as a special case LakeConstance

Sun, 07 Aug 2011 16:31:58 GMT

Some lakes never mix completely at any time during the year. Such lakes are called meromictic. The depth below which no mixing occurs is the monimolimnion, and the upper water layer that undergoes the circulation according to the climate of the region is the mixolimnion. A strong vertical chemical gradient or chemocline separates these two zones. Meromixis develops when the deep water of a lake becomes so heavy with dissolved substances that its density cannot be equaled by the cooling of the...

Reusing Your Gadgets and Electronics Gear GreenGadgets

Sun, 07 Aug 2011 14:29:40 GMT

In certain instances, reuse and recycle the second and third elements in the three Rs of green gadgets are interchangeable. Reusing gadgets, computers, and other electronic devices rather than throwing them away or sending them to a recycler can help reduce your impact on the planet and on your wallet . When you pass on to others who can use them your still-usable computers or other gadgets you've outgrown, you're practicing the ecofriendly act of reusing. Doing so extends the lives of usable...

The Biological Analogy IndustrialEcology

Sun, 07 Aug 2011 05:20:22 GMT

The biological analogy has been applied principally at the level of facilities, districts and regions, using notions borrowed from ecosystem ecology regarding the flow and especially the cycling of materials, nutrients and energy in ecosystems as a potential model for relationships between facilities and firms. The archetypal example is the industrial symbiosis in Kalundborg, but the search for other such arrangements and even more conspicuously the effort to establish such symbiotic networks...

The Highlands ForestService

Sun, 07 Aug 2011 04:10:00 GMT

Physiography Moving from east to west, upon leaving the Piedmont province one encounters the Blue Ridge and the Ridge and Valley provinces, and the Appalachian plateaus. The Blue Ridge Mountains, a belt 5 to 80 miles wide, extends from beyond the northern extremity of the southern Appalachians in Virginia southward to Georgia. This is the province through which passes the Appalachian Trail, the uninterrupted footpath from Maine's Mt. Katahdin to Springer Mountain in Georgia.12 This is also the...

High Mountains BreedingAreas

Sat, 06 Aug 2011 22:00:37 GMT

As mentioned already, migratory birds regularly cross high mountain ranges, often at extremely high altitudes. The high valleys may be snow-covered and frozen in spring, when they offer little or nothing for passing birds, but in autumn many birds can stop and feed in whatever vegetation is available there. The main problems are the considerable costs of climbing to high altitudes greatest in large birds , and the low temperatures, thin air and low oxygen levels often encountered Chapter 4 ....

Ecology of sexual dimorphism gender differences and sex ratio FleaSpecies

Sat, 06 Aug 2011 19:12:41 GMT

Males and females play complementary yet distinctly different evolutionary roles. They may differ in size and or shape, behaviour and response to environmental factors. As a result, the abundance of males and females in a population may be unequal. This inequality in numbers may have important ecological and evolutionary consequences. This chapter starts with the description of differences in size, behaviour and physiology between male and female fleas. I attempt to understand how these...

sediment input HudsonRiver

Sat, 06 Aug 2011 18:02:57 GMT

The amount of sediment delivered to the Hudson estuary is an important, but elusive number. The most direct measurements are made by periodically sampling the river water, determining the amount of suspended sediment per liter of water, and multiplying that by the discharge around the time of sampling. It can only be done easily above the tidal influence. Because it is an engaging task, it is not done all the time nor has it been done on every tributary. In addition, the sediment delivery is...

Pink Hibiscus Mealybug Population Dynamics 2

Sat, 06 Aug 2011 03:38:57 GMT

Pink hibiscus mealybug Maconellicoccus hirsutus Green Figure 1 invaded the Caribbean nation of Grenada in c. 1993, where it infested young shoots, flowers, and fruits of a wide range of plants, particularly those in the family Malvaceae. Among the important plants affected were ornamental hibiscus Hibiscus rosa-sinensis L. , soursop Annona muricata L. , cotton Gossypium hirsutum L. , cocoa Theobroma cacao L. , and citrus Citrus spp. . The mealybug reached high densities and began to spread...

Soil Water Content Microbiology

Fri, 05 Aug 2011 19:08:13 GMT

Soil water affects the moisture available to organisms as well as soil aeration status, the nature and amount of soluble materials, the osmotic pressure, and the pH of the soil solution. Water acts physically as an agent of transport by mass flow and as a medium through which reactants diffuse to and from sites of reaction. It acts chemically as a solvent, as a reactant in important chemical and biological reactions, and as a chemical buffer fixing the activity of water in soil solution at...

Crustacea MarineEcology

Fri, 05 Aug 2011 18:42:54 GMT

These are the most conspicuous element in the permanent zooplankton, commonly amounting numerically to at least 70 per cent of the total. The predominant class is the Copepoda. These are present in incredible numbers and are represented by many species. There are about 1200 species in the British sea area, of which Calanus Marshall and Orr, 1955 , Acartia, Centropages, Temora, Oithona, Pseudocalanus and Paracalanus are especially common Figure 2.10 . Another abundant group of planktonic...

Soil Temperature Microbiology

Fri, 05 Aug 2011 17:59:07 GMT

Many physical, chemical, and biological processes that occur in soil are influenced by temperature. Increasing temperature enhances mineralization of SOM or decomposition of plant residues by increasing rates of physiological reactions and by accelerating diffusion of soluble substrates in soil. An increase in temperature can also induce a shift in the composition of the microbial community. Whereas rates of molecular diffusion always increase with increasing temperature, solubility of gases in...

GAM in gam and GAM in mgcv CorrelationStructure

Fri, 05 Aug 2011 15:19:53 GMT

The additive model fits a smoothing curve through the data. There are as many smoothing techniques as there are roads to Rome. In R, there are two main packages for GAM The gam package written by Hastie and Tibshirani and the mgcv package produced by Wood. Each package has its own charms. Readers familiar with the classical textbook from Hastie and Tibshirani 1990 may prefer the gam package as it follows the theory described in the book. Estimation of smoothers is done using a method called the...

Ecophysiology of metallophytes IndustrialPollution

Fri, 05 Aug 2011 15:09:30 GMT

Up to now, no investigations have detected any specific metabolites in metal-tolerant ecotypes. Metal tolerances are due to differential gene activities which are up- or down-regulating enzymes. In the case of metal uptake into the roots, there is a down-regulation of the high-affinity phosphate transporter in arsenic-tolerant plants Macnair amp Cumbes 1987 or the elevated expression of Zn transporter genes Assuncao et al. 2001 . Once the metal is in the cell, metal-tolerant plants have...

Restricted Boltzmann Machine Population Dynamics 2

Fri, 05 Aug 2011 11:18:30 GMT

Boltzmann learning underlies an artificial neural network ANN model - the Boltzmann machine - based largely on the Hopfield network model see Hopfield Network with numerous improvements. An understanding of the principles of neural networks in general see Multilayer Perceptron , and Hopfield networks in particular, is highly recommended to better understand this article. Boltzmann learning uses stochastic binary units rather than the deterministic binary threshold units in a Hopfield model. It...

Archamoebae phylum Amoebozoa Conosa Pelobiontida SoilSolution

Fri, 05 Aug 2011 10:22:21 GMT

These common amoebae, such as Mastigella, Mastigina, Mastigamoeba and Pelomyxa, are found active in soils that are transiently anaerobic and rich in dissolved organic matter, and in peat or bogs Fig. 1.12 . They are secondarily amitochondriate, and possess an atypical cilium that appears rudimentary Walker et al., 2001 . The axoneme is reduced, always with a single and unpaired kinetosome. The amoeba in some species becomes rigid and loses its amoeboid motion when there is lack of food Fig....

Conclusion 1 Population Dynamics 2

Fri, 05 Aug 2011 08:43:29 GMT

Natural selection works through responses of individuals within populations to different environments. Therefore, population dynamics is intimately linked to natural selection, and speciation may have its foundations in within-species polymorphisms for resources. Adaptations may serve to either enhance population stability or lead to increased variation in demographic parameters, and are key to species performance across a wide range of environments, such as across latitudes. A new suite of...

The Receiver Operating Characteristic Curve AnimalBehaviour

Fri, 05 Aug 2011 08:41:45 GMT

Now, consider how P Correct Acceptance a and P False Alarm a change as the forager changes the decision threshold a. Suppose that our insectivorous bird picks a threshold a value say, a that leads it to always accept beetles regardless of their color. In this case, our forager will never miss a truly tasty beetle P Correct Acceptance a 1 , but the price of this advantage is that it always incorrectly accepts noxious beetles P False Alarm s 1 . At the other end of the spectrum, imagine that our...

Effect of Temperature Wastewater Treatment 2

Fri, 05 Aug 2011 05:15:09 GMT

At first it would seem that the Arrhenius equation 5.24 would be all that is needed to describe the temperature effect. In fact, it does hold, but only in the lower range of temperatures associated with life. At higher temperatures another reaction occurs the dena-turation of the enzyme. One way to handle this is to treat the denaturation reaction as a simultaneous equilibrium. The dissociation equilibrium constant, Kd, is related to temperature by where AGd, AHd, and ASd are Gibbs free energy,...

Systems Perspective IndustrialEcology

Tue, 02 Aug 2011 14:37:32 GMT

Industrial ecology emphasizes the critical need for a systems perspective in environmental analysis and decision making. The goal is to avoid narrow, partial analyses that can overlook important variables and, more importantly, lead to unintended consequences. The systems orientation is manifested in several different forms use of a life cycle perspective, use of materials and energy flow analysis, use of systems modeling, and sympathy for multidisciplinary and interdisciplinary research and...

Preface to the Second Edition EcologyStructure

Sat, 30 Jul 2011 09:01:42 GMT

The diversity of running water environments is enormous. When one considers torrential mountain brooks, large rivers of lowlands, and great rivers whose basins occupy subcontinents, it is apparent how location-specific environmental factors contribute to the sense of uniqueness and diversity of running waters. At the same time, however, our improved understanding of ecological, biogeochemical, hydrological, and geomorphological processes provides insight into the structural and functional...

Types of Adaptations Relevant to Population Dynamics Population Dynamics 2

Mon, 25 Jul 2011 17:51:34 GMT

Adaptations of feeding, antipredator, and reproductive morphology can directly affect population demography, and if they vary in space or time, can consequently drive variation in population demography. Alternative feeding morphologies in response to increased competition may increase population size but with reduced growth. Considerable variation in morphology associated with resource use is a classic example of local adaptation to the environment, and can therefore lead to variable population...

Responses to Abiotic Conditions InsectEcology

Mon, 25 Jul 2011 11:29:46 GMT

C. Disturbances II. Surviving Variable Abiotic Conditions A. Thermoregulation B Water Balance G Air and Water Chemistry III. ftctors Affecting Dispersal Behavior 45 A. Life History Strategy 45 B. Crowding 45 C Nutritional Status 46 D. Habitat and Resource Condition 46 E. Mechanism of Dispersal 47 IV. Responses to Anthropogenic Changes 49 V. Summary 51 A. Resource Requirements 54 B. Variation in Food Quality 55 C Plant Chemical Defenses 5 E. Factors Affecting Expression of Defenses 69 F....

Ecological Engineering and Environmental Management Ecological Engineering 2

Mon, 25 Jul 2011 10:00:32 GMT

S E Jorgensen, Copenhagen University, Copenhagen, Denmark 2009 Elsevier B.V. All rights reserved. Rachel Carson's book A Silent Spring started in the mid 1960s the first green wave. Pollution problems were able to attract the political attention in line with other impor tant problems such as social problems, traffic problems, economic problems, and educational problems that the society would have to deal with and solve. The pollution problems, often called the environmental problems, could be...

Contents EcosystemTheory

Mon, 25 Jul 2011 06:47:08 GMT

1. Introduction A New Ecology is Needed 1 1.1 Environmental management has changed 1 2. Ecosystems have Openness Thermodynamic 7 2.1 Why must ecosystems be open 7 2.2 An isolated system would die maximum entropy 8 2.4 The second law of thermodynamics interpreted for open systems 18 2.5 Dissipative structure 20 2.6 Quantification of openness and allometric principles 22 2.8 What about the environment 31 3. Ecosystems have Ontic Openness 35 3.2 Why is ontic openness so obscure 36 3.3 Ontic...

Introduction What Is an Adaptive Agent Population Dynamics 2

Mon, 25 Jul 2011 06:41:14 GMT

An 'agent' is an entity in a model that is motivated or goal driven, can adapt its behavior as a function of environmental stimuli, and makes decisions based on local information. An agent may also have memory, allowing it to adapt and make decisions based on past experience. Agents typically represent animals or humans. Due to their decision-making ability and due to the fact that they operate independently, without any top-down, centralized control, agents are often said to be 'autonomous'....

absolute humidity See humidity Carbon Dioxide 2

Mon, 25 Jul 2011 00:21:49 GMT

absorbed dose The amount of energy absorbed by a tissue or other substance from incident radiation. It is measured in grays Gy one gray the transfer of one joule of energy to one kilogram of material. absorption 1. The retention of radiant energy by an object, e.g. by the pigments of a photosynthetic organism. 2. The uptake of small nutrient molecules into the body of an organism. In animals this takes place after digestion of larger food molecules. In plants it includes the uptake of water and...

Preface UpperCretaceous

Sun, 24 Jul 2011 20:04:27 GMT

Popular interest in dinosaurs and other Mesozoic reptiles began during the third decade of the 19th century, and has increased continually since that time. In 1841, the name Dinosauria 'terrible lizards' was proposed by Richard Owen at the annual meeting of the British Association for the Advancement of Science, held in Plymouth it first appeared in print the following year. During subsequent decades, both scientific and popular interest were extended to pterosaurs, mosasaurs, ichthyosaurs and...

Abiotic and Biotic Environments Cause Stress PlantEcology

Sun, 24 Jul 2011 20:01:45 GMT

The environment affects an organism in many ways, at any time. To understand the reactions of a particular organism in a certain situation, individual external influences, so-called environmental factors, are usually considered separately, if at all possible. Environmental factors can be of abiotic and biotic nature. Biotic environmental factors, resulting from interactions with other organisms, are, for example, infection or mechanical damage by herbivory or trampling, as well as effects of...

National Environmental Policy Act WastewaterTreatment

Sun, 24 Jul 2011 14:10:42 GMT

The National Environmental Policy Act 42 USC 4321-4370 40 CFR Parts 1500-1508 . for many policies set forth in other environmental statutes. First, the NEPA 2, 42 USC 4321 sets forth a national policy to encourage productive and enjoyable harmony between man and his environment and to promote efforts which will prevent or eliminate damage to the environment and biosphere and stimulate the health and welfare of man. In addition, the NEPA 101 a , 42 USC 4331 a establishes a continuing federal...

Cambridge University Press BumbleBees

Sat, 23 Jul 2011 14:33:01 GMT

The Edinburgh Building, Cambridge CB2 2RU, UK 40 West 20th Street, New York, NY 10011-4211, USA 477 Williamstown Road, Port Melbourne, VIC 3207, Australia Ruiz de Alarcon 13, 28014 Madrid, Spain Dock House, The Waterfront, Cape Town 8001, South Africa First published in printed format 2001 ISBN 0-511-04097-0 eBook netLibrary ISBN 0-521-78195-7 hardback