Species extinctions in food webs – local and regional processes Anna Eklöf
... Loss of biodiversity is one of the most severe threats to the ecosystems of the world. The major causes behind the high population and species extinction rates are anthropogenic activities such as overharvesting of natural populations, pollution, climate change and destruction and fragmentation of n ...
... Loss of biodiversity is one of the most severe threats to the ecosystems of the world. The major causes behind the high population and species extinction rates are anthropogenic activities such as overharvesting of natural populations, pollution, climate change and destruction and fragmentation of n ...
Seafarers or castaways: ecological traits associated with rafting
... even if the flotsam itself provides no resources. The ‘indicator-log’ hypothesis, for example, proposes that fishes are attracted to rafts because they originate in and remain within resource-rich areas (i.e. river mouth, mangrove swamps) or aggregate in frontal zones and convergences where plankton ...
... even if the flotsam itself provides no resources. The ‘indicator-log’ hypothesis, for example, proposes that fishes are attracted to rafts because they originate in and remain within resource-rich areas (i.e. river mouth, mangrove swamps) or aggregate in frontal zones and convergences where plankton ...
Kerim Aydin Alaska Fisheries Science Center
... – A number of the Fishery Management Councils have demonstrated significant progress in integrating ecosystem considerations in fisheries management using the existing authorities provided under this [MSFCMA]. ...
... – A number of the Fishery Management Councils have demonstrated significant progress in integrating ecosystem considerations in fisheries management using the existing authorities provided under this [MSFCMA]. ...
Conservation issues for Darwin`s finches in the Galápagos
... (young) males in 2006, which suggests unsuccessful breeding in the previous year(s). No Black 5 (old) males were observed in either study year……………………………45! Figure 3.1 Map of Floreana Island, Galápagos Archipelago, Ecuador. The highland zone includes elevations above the 300m contour, within which t ...
... (young) males in 2006, which suggests unsuccessful breeding in the previous year(s). No Black 5 (old) males were observed in either study year……………………………45! Figure 3.1 Map of Floreana Island, Galápagos Archipelago, Ecuador. The highland zone includes elevations above the 300m contour, within which t ...
Cayman`s blue iguanas moves to “endangered” from “critically
... summation of monitored iguana locations. This area may increase slightly in the next decade, but is currently not predicted to reach one km² (using the recommended grid size of 2×2 km for estimating AOO increases the area to 12 km², a figure which is well within the Endangered threshold and very cl ...
... summation of monitored iguana locations. This area may increase slightly in the next decade, but is currently not predicted to reach one km² (using the recommended grid size of 2×2 km for estimating AOO increases the area to 12 km², a figure which is well within the Endangered threshold and very cl ...
An Introduction To Ecology
... http://www.apsnet.org/education/illustratedglossary/PhotosE-H/forestdecline.htm ...
... http://www.apsnet.org/education/illustratedglossary/PhotosE-H/forestdecline.htm ...
Effects of some natural and artificial substrata on sessile marine
... algae occupied less space on perspex plates than on plates of the other 4 types of substrata. In contrast, the coralline crust LUlothamn~onsp. was most abundant on perspex and concrete in the lagoon. Results demonstrate that type of substratum plays an important role in determining the abundance of ...
... algae occupied less space on perspex plates than on plates of the other 4 types of substrata. In contrast, the coralline crust LUlothamn~onsp. was most abundant on perspex and concrete in the lagoon. Results demonstrate that type of substratum plays an important role in determining the abundance of ...
Long-billed Curlew (Numenius americanus)
... limiting factor for Long-billed Curlews and cited evidence for increasing numbers of coyotes in Saskatchewan and Alberta. Although data on coyote populations are lacking for Alberta (D. Prescott pers. comm. 2010) and Saskatchewan, count data from Nature Saskatchewan show a decline in numbers from 20 ...
... limiting factor for Long-billed Curlews and cited evidence for increasing numbers of coyotes in Saskatchewan and Alberta. Although data on coyote populations are lacking for Alberta (D. Prescott pers. comm. 2010) and Saskatchewan, count data from Nature Saskatchewan show a decline in numbers from 20 ...
3. Project Outputs and Rationale
... diversity has yielded an “outstanding range of biodiversity and ecosystems” (WWF). This biological significance includes over 3,200 plant species per 10,000 km2 (Royal Government of Bhutan, Planning Commission, 2002) and important populations of endangered mammals, birds and plants (BIMS). With thre ...
... diversity has yielded an “outstanding range of biodiversity and ecosystems” (WWF). This biological significance includes over 3,200 plant species per 10,000 km2 (Royal Government of Bhutan, Planning Commission, 2002) and important populations of endangered mammals, birds and plants (BIMS). With thre ...
bakersfield cactus - Bakersfield Habitat Conservation Plan
... populations of the cactus. They have seen firsthand the damage caused by dumping, trespassing and offroad vehicle use. Because almost all of the known sites are on private land, the couple would like to see more protection to make up with what has been lost. “We have both devoted our careers to the ...
... populations of the cactus. They have seen firsthand the damage caused by dumping, trespassing and offroad vehicle use. Because almost all of the known sites are on private land, the couple would like to see more protection to make up with what has been lost. “We have both devoted our careers to the ...
Multiple scale composition and spatial distribution patterns of the
... landscape-scale spatial patterns in forests largely undisturbed by human activities. Undisturbed forest is restricted to small remnant patches and, even in boreal forests where human disturbance is minimal in some places, little is known about spatial patterns. Gustafson (1998) suggests that there a ...
... landscape-scale spatial patterns in forests largely undisturbed by human activities. Undisturbed forest is restricted to small remnant patches and, even in boreal forests where human disturbance is minimal in some places, little is known about spatial patterns. Gustafson (1998) suggests that there a ...
Two Pines Tract - Charleston County Parks
... conversion to loblolly pine for wood production. The predominate specie here is loblolly pine with scattered clumps or pockets of live oak (Quercus virginiana), cabbage palm, (Sabal palmetto), southern red cedar (Juniperus silicicola), and magnolia (Magnolia grandiflora) in the overstory and wax myr ...
... conversion to loblolly pine for wood production. The predominate specie here is loblolly pine with scattered clumps or pockets of live oak (Quercus virginiana), cabbage palm, (Sabal palmetto), southern red cedar (Juniperus silicicola), and magnolia (Magnolia grandiflora) in the overstory and wax myr ...
Jepsen Breeding J Ornithology 157
... received much attention in the scientific literature, particularly with respect to climate change and its implications for vulnerable species (e.g., Chen et al. 2011; McClure et al. 2012). Physical factors (e.g., climate) are recognised as being the principal drivers of species ranges at regional an ...
... received much attention in the scientific literature, particularly with respect to climate change and its implications for vulnerable species (e.g., Chen et al. 2011; McClure et al. 2012). Physical factors (e.g., climate) are recognised as being the principal drivers of species ranges at regional an ...
press perturbations and the predictability of ecological interactions
... directional indeterminacy means, for example, that the addition of predators to a community will not necessarily result in fewer prey species (Yodzis 1988). The inverse of the community matrix offers a useful theoretical benchmark to begin assessing the likelihood of indeterminacy in the outcome of ...
... directional indeterminacy means, for example, that the addition of predators to a community will not necessarily result in fewer prey species (Yodzis 1988). The inverse of the community matrix offers a useful theoretical benchmark to begin assessing the likelihood of indeterminacy in the outcome of ...
Herbivory in arid and semi-arid regions of Argentina
... As I will show later, there are indications There is evidence that the dynamics, sta- that all these factors play a relevant role in bility and resilience of semi-arid ecosystems the vast semi-arid ecosystems of Argentina. (particularly savannas) can be significantly Unfortunately, and because of th ...
... As I will show later, there are indications There is evidence that the dynamics, sta- that all these factors play a relevant role in bility and resilience of semi-arid ecosystems the vast semi-arid ecosystems of Argentina. (particularly savannas) can be significantly Unfortunately, and because of th ...
Forest Restoration Ecology - College of Tropical Agriculture and
... – 2nd most important cause of loss of biodiversity – In the U.S., >1/2 of the species listed as threatened or endangered are at risk due to competition with or predation by nonnative species ...
... – 2nd most important cause of loss of biodiversity – In the U.S., >1/2 of the species listed as threatened or endangered are at risk due to competition with or predation by nonnative species ...
Great Basin Fact Sheet No. 8: Establishing Big Sagebrush and Other
... flat or rolling topography that is not rocky. Transplanters are most economically used on large projects with good access. Capabilities vary among models. Monitoring Post-planting monitoring should be employed to evaluate seedling establishment and inform future restoration practices. Standard metho ...
... flat or rolling topography that is not rocky. Transplanters are most economically used on large projects with good access. Capabilities vary among models. Monitoring Post-planting monitoring should be employed to evaluate seedling establishment and inform future restoration practices. Standard metho ...
D3.1 Annex 8b Section 6 Environmental impact pests
... In this question we rate the current environmental impact in other invaded regions that can be used as indicator for determining the potential environmental impact in the PRA area (Q. 6.09). If the species has not invaded any other area, or if the invasion is too recent and too little is known about ...
... In this question we rate the current environmental impact in other invaded regions that can be used as indicator for determining the potential environmental impact in the PRA area (Q. 6.09). If the species has not invaded any other area, or if the invasion is too recent and too little is known about ...
Effects of stocking-up freshwater food webs
... recreational fisheries through authorized and unauthorized stocking into freshwater systems is a global phenomenon. Stocked fishes are often top predators that either replace native top predators or increase the species richness of top predators. Many direct effects of stocking have been documented, ...
... recreational fisheries through authorized and unauthorized stocking into freshwater systems is a global phenomenon. Stocked fishes are often top predators that either replace native top predators or increase the species richness of top predators. Many direct effects of stocking have been documented, ...
Marshak Marine Ecol Conch Lecture
... Juveniles are settling/recruiting into both shallow seagrass and deeper algal sand habitats, but higher proportions and densities are found within seagrasses. ...
... Juveniles are settling/recruiting into both shallow seagrass and deeper algal sand habitats, but higher proportions and densities are found within seagrasses. ...
Biogeography and the structure of coral reef fish communities on
... the balance of rates of colonization, local extinction and speciation (MacArthur & Wilson, 1963, 1967). Dispersal ability affects colonization (Diamond et al., 1976), while rates of extinction and in situ speciation are influenced by an island’s isolation, size, age and environmental stability (MacA ...
... the balance of rates of colonization, local extinction and speciation (MacArthur & Wilson, 1963, 1967). Dispersal ability affects colonization (Diamond et al., 1976), while rates of extinction and in situ speciation are influenced by an island’s isolation, size, age and environmental stability (MacA ...
Full text in pdf format
... important populations, such as those supporting commercial and recreational fisheries, although some decisions on pollution will be based on risks to human health, or in some instances on maintaining species diversity. Nevertheless, the issue of how a given effect of pollution relates to production ...
... important populations, such as those supporting commercial and recreational fisheries, although some decisions on pollution will be based on risks to human health, or in some instances on maintaining species diversity. Nevertheless, the issue of how a given effect of pollution relates to production ...
Extent and ecological consequences of hunting
... Wildlife species are not equally affected by hunting, although some general ecological rules are clear: large, low-density, slow-reproducing and specialist species, such as elephants, will be more vulnerable to increases in predation pressure than smaller, fast-reproducing and high-density generalis ...
... Wildlife species are not equally affected by hunting, although some general ecological rules are clear: large, low-density, slow-reproducing and specialist species, such as elephants, will be more vulnerable to increases in predation pressure than smaller, fast-reproducing and high-density generalis ...
407 terrestrial activity patterns of wild cats from camera
... (Laidlaw & Shaharuddin, 1998; Kawanishi & Sunquist, 2004). Such data can be used to study processes shaping ecological communities, especially whether potentially competing species overlap or avoid each other temporally, and how larger species might influence activity of their smaller cohorts in the ...
... (Laidlaw & Shaharuddin, 1998; Kawanishi & Sunquist, 2004). Such data can be used to study processes shaping ecological communities, especially whether potentially competing species overlap or avoid each other temporally, and how larger species might influence activity of their smaller cohorts in the ...
Biological Dynamics of Forest Fragments Project
The Biological Dynamics of Forest Fragments Project, originally called the Minimum Critical Size of Ecosystems Project is a large-scale ecological experiment looking at the effects of habitat fragmentation on tropical rainforest; it is one of the most expensive biology experiments ever run. The experiment, which was established in 1979 is located near Manaus, in the Brazilian Amazon. The project is jointly managed by the Smithsonian Institution and INPA, the Brazilian Institute for Research in the Amazon.The project was initiated in 1979 by Thomas Lovejoy to investigate the SLOSS debate. Initially named the Minimum Critical Size of Ecosystems Project, the project created forest fragments of sizes 1 hectare (2 acres), 10 hectares (25 acres), and 100 hectares (247 acres). Data were collected prior to the creation of the fragments and studies of the effects of fragmentation now exceed 25 years.As of October 2010 562 publications and 143 graduate dissertations and theses had emerged from the project.