Biodiversity: Patterns, Processes, Loss and Value
... "Intriguingly, I have never seen anybody discuss what we actually know about the 1.7 million (species) that do have names. Overwhelmingly the answer will be nothing, except where they were collected and what they look like." ...
... "Intriguingly, I have never seen anybody discuss what we actually know about the 1.7 million (species) that do have names. Overwhelmingly the answer will be nothing, except where they were collected and what they look like." ...
Comparative Population Ecology of Eleven Species
... diverse species to persist and coexist in highly variable desert environments. Here we present eight years of data comparing the population ecology of the 11 species of common heteromyid and murid (cricetid) rodents that coexist on - 20 ha of Chihuahuan Desert in southeastern Arizona. On the one han ...
... diverse species to persist and coexist in highly variable desert environments. Here we present eight years of data comparing the population ecology of the 11 species of common heteromyid and murid (cricetid) rodents that coexist on - 20 ha of Chihuahuan Desert in southeastern Arizona. On the one han ...
Is a healthy ecosystem one that is rich in parasites?
... process of apparent competition, but specialist parasites can act to increase biodiversity. The Janzen–Connell hypothesis [25,26] proposes that high biodiversity in rainforests occurs because strong levels of local frequency-dependent predation reduce the probability that plants of the same species ...
... process of apparent competition, but specialist parasites can act to increase biodiversity. The Janzen–Connell hypothesis [25,26] proposes that high biodiversity in rainforests occurs because strong levels of local frequency-dependent predation reduce the probability that plants of the same species ...
Lake Victoria - University of Liverpool
... Barbus sp.), Bagrus sp. , Schilbe sp. , Clarias sp. all catfish and some Haplochromis spp. Since 1985 food fish catches have fallen and remained low Combined pressure exerted by these species on stocks in lakes not considered significant as they are only part time predators and no problems in ...
... Barbus sp.), Bagrus sp. , Schilbe sp. , Clarias sp. all catfish and some Haplochromis spp. Since 1985 food fish catches have fallen and remained low Combined pressure exerted by these species on stocks in lakes not considered significant as they are only part time predators and no problems in ...
latin american farming.wpd
... generated and maintainable inputs, favorable energy input/output ratios, and articulation with both subsistence and market needs, comprises an effective approach to achieve food security, income generation, and environmental conservation (Pretty, 1997; Altieri et al., 1998). As it will be argued in ...
... generated and maintainable inputs, favorable energy input/output ratios, and articulation with both subsistence and market needs, comprises an effective approach to achieve food security, income generation, and environmental conservation (Pretty, 1997; Altieri et al., 1998). As it will be argued in ...
Abstracts PDF - California and Nevada Amphibian Populations Task
... of Herpetology, Los Angeles, CA and Department of Biology, La Sierra University, Riverside, CA; 3U.S. Geological Survey, Western Ecological Research Center, San Diego Field Station, San Diego, CA. The Value of Museum Collections: The Examination of Museum Specimens Leads to a Contraction of the Know ...
... of Herpetology, Los Angeles, CA and Department of Biology, La Sierra University, Riverside, CA; 3U.S. Geological Survey, Western Ecological Research Center, San Diego Field Station, San Diego, CA. The Value of Museum Collections: The Examination of Museum Specimens Leads to a Contraction of the Know ...
The Aegean archipelago: a natural laboratory of
... and has been the stage for a very long interaction between human civilizations and local ecosystems. This work presents insights that have been gained from past and current relevant research in the area, highlighting also the importance of the Aegean archipelago as a useful model to address many maj ...
... and has been the stage for a very long interaction between human civilizations and local ecosystems. This work presents insights that have been gained from past and current relevant research in the area, highlighting also the importance of the Aegean archipelago as a useful model to address many maj ...
The acid taste of climate change: 20th century acidification is
... extreme events like extensive droughts (Smith and Wood 2002, Wood et al. 2010) as these hybrid ecosystems linking groundwater to the uppermost section of surface running waters are commonly reported to exhibit very constant abiotic environments in terms of discharge, temperature and water chemistry ...
... extreme events like extensive droughts (Smith and Wood 2002, Wood et al. 2010) as these hybrid ecosystems linking groundwater to the uppermost section of surface running waters are commonly reported to exhibit very constant abiotic environments in terms of discharge, temperature and water chemistry ...
MPA Monitoring Metrics: Kelp and Shallow Rock Ecosystems (0
... As a step towards implementation of the 1999 California Marine Life Protection Act, the California Fish and Game Commission adopted a MPA network for the South Coast region on December 15, 2010. MPA monitoring in this region is guided by the South Coast MPA Monitoring Plan. The plan has been develop ...
... As a step towards implementation of the 1999 California Marine Life Protection Act, the California Fish and Game Commission adopted a MPA network for the South Coast region on December 15, 2010. MPA monitoring in this region is guided by the South Coast MPA Monitoring Plan. The plan has been develop ...
Impact: toward a framework for understanding
... given to defining what we mean by impact, or connecting ecological theory with particular measures of impact. The resulting lack of generalizations regarding invasion impacts is more than an academic problem; we need to be able to distinguish invaders with minor effects from those with large effects ...
... given to defining what we mean by impact, or connecting ecological theory with particular measures of impact. The resulting lack of generalizations regarding invasion impacts is more than an academic problem; we need to be able to distinguish invaders with minor effects from those with large effects ...
Food Web Control of Primary Production in Lakes
... abundance of zooplantivorous fishes and small species of zooplankton grazers. In another study lake dominated by piscivorous fish and large-bodied grazers, primary production was contained below predicted models of nutrient loading, with the exception of nuisance (inedible) bluegreen algae. It was c ...
... abundance of zooplantivorous fishes and small species of zooplankton grazers. In another study lake dominated by piscivorous fish and large-bodied grazers, primary production was contained below predicted models of nutrient loading, with the exception of nuisance (inedible) bluegreen algae. It was c ...
Unit Two - Friends of the Boundary Waters Wilderness
... BAC KG R O U N D ( 1 O F 2 ) Think of all the different plants and animals which live in your backyard: squirrels; birds; mice; voles; mosquitoes; wasps; grass; dandelions; daisies; maple trees; an oak tree; or a willow tree. If you looked carefully you would find many different species, or types of ...
... BAC KG R O U N D ( 1 O F 2 ) Think of all the different plants and animals which live in your backyard: squirrels; birds; mice; voles; mosquitoes; wasps; grass; dandelions; daisies; maple trees; an oak tree; or a willow tree. If you looked carefully you would find many different species, or types of ...
Coastal Douglas-fir Zone - Ministry of Forests, Lands and Natural
... Wildfires were once common in the Coastal Douglas-fir Zone and played an important role in shaping its ecosystems. For example, there is evidence that 300 or 400 years ago, large fires burned away much of the forest on Vancouver Island’s east coast, from Victoria to Campbell River. Today, forest fir ...
... Wildfires were once common in the Coastal Douglas-fir Zone and played an important role in shaping its ecosystems. For example, there is evidence that 300 or 400 years ago, large fires burned away much of the forest on Vancouver Island’s east coast, from Victoria to Campbell River. Today, forest fir ...
Public Sector OR in Japan: Education, Research, and Applications
... [1] H. Takasakura and T. Oyama, 1994; “Optimization of collection and transportation system of city wastes”, Communications of Operations Research, Operations Research Society of Japan, Vol.39, No.12, pp.653-658 (in Japanese). [2] T. Oyama and T. Ichimori, 1995. "On the Unbiasedness of the Parametr ...
... [1] H. Takasakura and T. Oyama, 1994; “Optimization of collection and transportation system of city wastes”, Communications of Operations Research, Operations Research Society of Japan, Vol.39, No.12, pp.653-658 (in Japanese). [2] T. Oyama and T. Ichimori, 1995. "On the Unbiasedness of the Parametr ...
Translocation strategies for multiple species depend on interspecific
... For competitive and mutualistic interactions, we use models by Wang et al. (1999). Here, the population growth of two competitors, C1 and C2, is defined by their birth rates, bC1 and bC2, and their death rates, dC1 and dC2, respectively (Eqs. 2a, 2b). Both species are linked through competition by i ...
... For competitive and mutualistic interactions, we use models by Wang et al. (1999). Here, the population growth of two competitors, C1 and C2, is defined by their birth rates, bC1 and bC2, and their death rates, dC1 and dC2, respectively (Eqs. 2a, 2b). Both species are linked through competition by i ...
Impact: Toward a Framework for Understanding the Ecological
... given to defining what we mean by impact, or connecting ecological theory with particular measures of impact. The resulting lack of generalizations regarding invasion impacts is more than an academic problem; we need to be able to distinguish invaders with minor effects from those with large effects ...
... given to defining what we mean by impact, or connecting ecological theory with particular measures of impact. The resulting lack of generalizations regarding invasion impacts is more than an academic problem; we need to be able to distinguish invaders with minor effects from those with large effects ...
Bill Analysis - Texas Legislature Online
... Current law allows for such land to be designated as "qualified open-space land" for purposes of property tax appraisal. What the law does not provide is any guidance about how much ecological research must be conducted for land to qualify for this tax exemption nor any guidance on how to appraise t ...
... Current law allows for such land to be designated as "qualified open-space land" for purposes of property tax appraisal. What the law does not provide is any guidance about how much ecological research must be conducted for land to qualify for this tax exemption nor any guidance on how to appraise t ...
Chapter 52 lecture outline
... Until about 16,000 years ago, continental glaciers covered much of North America and Eurasia. As the climate warmed and the glaciers melted, the distribution of trees expanded northward. o A detailed record of these migrations is captured in fossil pollen in lake and pond sediments. ...
... Until about 16,000 years ago, continental glaciers covered much of North America and Eurasia. As the climate warmed and the glaciers melted, the distribution of trees expanded northward. o A detailed record of these migrations is captured in fossil pollen in lake and pond sediments. ...
Comments
... nipulated by the experimenter (venue and density in this case), or uncontrolled factors are distributed among experimental units by a strict process of randomization or can reasonably be assumed to be randomly distributed across experimental units and hence treatments (Fisher 1956, Hurlbert 1984). A ...
... nipulated by the experimenter (venue and density in this case), or uncontrolled factors are distributed among experimental units by a strict process of randomization or can reasonably be assumed to be randomly distributed across experimental units and hence treatments (Fisher 1956, Hurlbert 1984). A ...
A growth cline in encrusting benthos along a latitudinal gradient
... suspension-feeding activity (Barnes & Clarke 1995). Neither ideas on temperature or food-supply limitation have effectively been tested within the range of conditions encountered in polar environments or using the same species. The field data obtained here, whilst not representing a controlled exper ...
... suspension-feeding activity (Barnes & Clarke 1995). Neither ideas on temperature or food-supply limitation have effectively been tested within the range of conditions encountered in polar environments or using the same species. The field data obtained here, whilst not representing a controlled exper ...
Trophic resource partitioning within a shorebird community feeding
... different sizes, with larger-bodied species feeding on larger prey of wider size range and small-bodied species feeding on smaller prey with less variability in their selection. Different methods such as stomach content or faeces analysis have previously been used to describe the diet and consequent ...
... different sizes, with larger-bodied species feeding on larger prey of wider size range and small-bodied species feeding on smaller prey with less variability in their selection. Different methods such as stomach content or faeces analysis have previously been used to describe the diet and consequent ...
Theoretical ecology
Theoretical ecology is the scientific discipline devoted to the study of ecological systems using theoretical methods such as simple conceptual models, mathematical models, computational simulations, and advanced data analysis. Effective models improve understanding of the natural world by revealing how the dynamics of species populations are often based on fundamental biological conditions and processes. Further, the field aims to unify a diverse range of empirical observations by assuming that common, mechanistic processes generate observable phenomena across species and ecological environments. Based on biologically realistic assumptions, theoretical ecologists are able to uncover novel, non-intuitive insights about natural processes. Theoretical results are often verified by empirical and observational studies, revealing the power of theoretical methods in both predicting and understanding the noisy, diverse biological world.The field is broad and includes foundations in applied mathematics, computer science, biology, statistical physics, genetics, chemistry, evolution, and conservation biology. Theoretical ecology aims to explain a diverse range of phenomena in the life sciences, such as population growth and dynamics, fisheries, competition, evolutionary theory, epidemiology, animal behavior and group dynamics, food webs, ecosystems, spatial ecology, and the effects of climate change.Theoretical ecology has further benefited from the advent of fast computing power, allowing the analysis and visualization of large-scale computational simulations of ecological phenomena. Importantly, these modern tools provide quantitative predictions about the effects of human induced environmental change on a diverse variety of ecological phenomena, such as: species invasions, climate change, the effect of fishing and hunting on food network stability, and the global carbon cycle.