Islands as an Invasion Pathway for the Rusty Crayfish, Orconectes
... of these invaders have little impact, but some cause major changes in aquatic food webs and the habitats that they invade. These invaders have been called nuisance nonindigenous species (NIS) because they can cause major problems. In freshwater habitats introductions of non-indigenous species can be ...
... of these invaders have little impact, but some cause major changes in aquatic food webs and the habitats that they invade. These invaders have been called nuisance nonindigenous species (NIS) because they can cause major problems. In freshwater habitats introductions of non-indigenous species can be ...
Translocation Protocol for the Ord`s Kangaroo Rat
... nocturnally-active rodent in the family Heteromyidae. The species has a limited distribution in Alberta (Figure 1). The core of the Alberta range is the Middle Sand Hills region, and peripheral sub-populations exist in adjacent regions, particularly the Dune Point sand dunes near Bindloss, AB and th ...
... nocturnally-active rodent in the family Heteromyidae. The species has a limited distribution in Alberta (Figure 1). The core of the Alberta range is the Middle Sand Hills region, and peripheral sub-populations exist in adjacent regions, particularly the Dune Point sand dunes near Bindloss, AB and th ...
Fear in Wildlife Food Webs: Large Carnivore Predation Risk
... Figure 2.2. Shrub- and ground-nesting songbird (a) and corvid (b) abundance per hectare on raccoon-present (grey bars) and raccoon-absent (white bars) islands. Values are means ± SE. The asterisk denotes a significant difference of P < 0.05. .................... 24 Figure 2.3. (a) Prickleback and (b ...
... Figure 2.2. Shrub- and ground-nesting songbird (a) and corvid (b) abundance per hectare on raccoon-present (grey bars) and raccoon-absent (white bars) islands. Values are means ± SE. The asterisk denotes a significant difference of P < 0.05. .................... 24 Figure 2.3. (a) Prickleback and (b ...
THE RELATIONSHIP BETWEEN PRODUCTIVITY AND SPECIES
... of existing functional groups. Lawton (102) proposed a model in which species may have strong, idiosyncratic effects on ecosystems. If this is the case, there is no predictable effect of species richness per se on ecosystem function. However, if the properties or functional traits of individual spec ...
... of existing functional groups. Lawton (102) proposed a model in which species may have strong, idiosyncratic effects on ecosystems. If this is the case, there is no predictable effect of species richness per se on ecosystem function. However, if the properties or functional traits of individual spec ...
THE RELATIONSHIP BETWEEN PRODUCTIVITY AND SPECIES
... of existing functional groups. Lawton (102) proposed a model in which species may have strong, idiosyncratic effects on ecosystems. If this is the case, there is no predictable effect of species richness per se on ecosystem function. However, if the properties or functional traits of individual spec ...
... of existing functional groups. Lawton (102) proposed a model in which species may have strong, idiosyncratic effects on ecosystems. If this is the case, there is no predictable effect of species richness per se on ecosystem function. However, if the properties or functional traits of individual spec ...
Game Structures in Mutualistic Interactions: What Can
... explaining how the investment behavior promotes benefits that outweigh the costs. Note that kin selection theory too starts with the observation of one animal investing into another, and then explains this oddity away with the concept of relatedness. The same is true for reciprocity based on the ite ...
... explaining how the investment behavior promotes benefits that outweigh the costs. Note that kin selection theory too starts with the observation of one animal investing into another, and then explains this oddity away with the concept of relatedness. The same is true for reciprocity based on the ite ...
Invasive Species Management Plan
... The National Invasive Species Council, established by Executive Order 13112, estimates that invasive species cost the U.S. at least $132 billion per year. The Council, established on the federal level to provide leadership and coordinate federal efforts to manage invasive species, developed a Nation ...
... The National Invasive Species Council, established by Executive Order 13112, estimates that invasive species cost the U.S. at least $132 billion per year. The Council, established on the federal level to provide leadership and coordinate federal efforts to manage invasive species, developed a Nation ...
Environmental filtering of crustacean zooplankton
... there is evidence that they may preferentially prey on large-bodied species (Wissel and Benndorf, 1998; Pagano et al., 2003). This is be particularly true when larger chaoborids (e.g. C. trivittatus) are the dominant predators (Young and Riessen, 2005). Probably, small body size is actually a compet ...
... there is evidence that they may preferentially prey on large-bodied species (Wissel and Benndorf, 1998; Pagano et al., 2003). This is be particularly true when larger chaoborids (e.g. C. trivittatus) are the dominant predators (Young and Riessen, 2005). Probably, small body size is actually a compet ...
Compensation masks trophic cascades in complex food
... where Bpost and Bpre are aggregate producer community biomasses summed over all nR producers and averaged over the final 100 time steps after and before predator invasions respectively. Biomasses were averaged in order to measure cascades for systems with oscillatory behavior in the steady state, wh ...
... where Bpost and Bpre are aggregate producer community biomasses summed over all nR producers and averaged over the final 100 time steps after and before predator invasions respectively. Biomasses were averaged in order to measure cascades for systems with oscillatory behavior in the steady state, wh ...
Distribution of sympatric seahorse species along a gradient of
... flats exposed to increased tidal flow and water depth. Despite conservation concern (Santos et al. 1995, Foster & Vincent 2004, IUCN 2004), this is one of few ecological studies of either H. guttulatus or H. hippocampus. Our objectives were to (1) estimate local population abundances, (2) quantify d ...
... flats exposed to increased tidal flow and water depth. Despite conservation concern (Santos et al. 1995, Foster & Vincent 2004, IUCN 2004), this is one of few ecological studies of either H. guttulatus or H. hippocampus. Our objectives were to (1) estimate local population abundances, (2) quantify d ...
Chapter 2 Diatoms in the pelagic and benthic environment
... concept refers to the linkages between benthic and pelagic environments, which play a major role (along with terrigenous input and upwelling) in determining the production and biological structure of aquatic systems (Sommer 1989, Valiela 1995). However, most studies on benthic-pelagic coupling have ...
... concept refers to the linkages between benthic and pelagic environments, which play a major role (along with terrigenous input and upwelling) in determining the production and biological structure of aquatic systems (Sommer 1989, Valiela 1995). However, most studies on benthic-pelagic coupling have ...
2008 ICTWS Meeting Program - Idaho Chapter of the Wildlife Society
... Dale Goble is the Margaret Wilson Schimke Distinguished Professor of Law at the University of Idaho. He earned an A.B. in philosophy from Columbia College and a J.D. from the University of Oregon. Following law school, he taught at Oregon for a year before joining the Solicitor's Office at the Depar ...
... Dale Goble is the Margaret Wilson Schimke Distinguished Professor of Law at the University of Idaho. He earned an A.B. in philosophy from Columbia College and a J.D. from the University of Oregon. Following law school, he taught at Oregon for a year before joining the Solicitor's Office at the Depar ...
Is there a relationship between herbaceous species richness and
... Abstract Cenchrus ciliaris L. (buffel grass) (Poaceae) is recognized as one of Australia’s most serious environmental weeds. This introduced grass has been associated with loss of native species and alteration of fire regimes. However, it is also highly valued as a pasture species for arid and semia ...
... Abstract Cenchrus ciliaris L. (buffel grass) (Poaceae) is recognized as one of Australia’s most serious environmental weeds. This introduced grass has been associated with loss of native species and alteration of fire regimes. However, it is also highly valued as a pasture species for arid and semia ...
Diversity analysis: A fresh Approach
... to coincide with a biologically meaningful concept of diversity. Imagine a community with a million equally common species. Its Gini-Simpson index is 0.999999. A plague attacks this community and eliminates 99.99% of the species, leaving only a hundred species untouched. Ecologists and conservation ...
... to coincide with a biologically meaningful concept of diversity. Imagine a community with a million equally common species. Its Gini-Simpson index is 0.999999. A plague attacks this community and eliminates 99.99% of the species, leaving only a hundred species untouched. Ecologists and conservation ...
MF2222 Biological control of Insect Pests on Field Crops in Kansas
... includes the use of microbial insecticides as well as many specific uses of predators and parasitic insects. On the other hand, many natural enemies that are sold do not control the intended target pest(s). Although the reasons for poor control can be very complex, probably the most common cause of ...
... includes the use of microbial insecticides as well as many specific uses of predators and parasitic insects. On the other hand, many natural enemies that are sold do not control the intended target pest(s). Although the reasons for poor control can be very complex, probably the most common cause of ...
2. Guidelines for Identifying Threats
... strategies to mitigate or alleviate threats. This step focuses on evaluating the body of evidence indicating whether certain actions or approaches are actually effective in reducing the threat. All threats will likely not have an equivalent impact upon a species and these impacts may be altered by i ...
... strategies to mitigate or alleviate threats. This step focuses on evaluating the body of evidence indicating whether certain actions or approaches are actually effective in reducing the threat. All threats will likely not have an equivalent impact upon a species and these impacts may be altered by i ...
Patterns of trophic niche divergence between invasive
... invasive species are essential for robust risk assessment (Britton, Davies & Brazier 2010; Britton, Gozlan & Copp 2011). A long-standing paradigm of freshwater invasion ecology is that ecological impacts often develop through increased interspecific competition for food resources occurring between i ...
... invasive species are essential for robust risk assessment (Britton, Davies & Brazier 2010; Britton, Gozlan & Copp 2011). A long-standing paradigm of freshwater invasion ecology is that ecological impacts often develop through increased interspecific competition for food resources occurring between i ...
Options and limitations of statistical modelling as a tool for
... brackish water to change for example their feeding behaviour might also affect the capability to detect occurring functional changes along other natural or anthropogenic induced gradients. The second aim of the thesis was the development of quantitative distribution maps and their linkage with singl ...
... brackish water to change for example their feeding behaviour might also affect the capability to detect occurring functional changes along other natural or anthropogenic induced gradients. The second aim of the thesis was the development of quantitative distribution maps and their linkage with singl ...
Practical implementation of species` recovery plans
... priority accorded to them, the money available and various practical obstacles all failed to explain the target levels achieved. However qualitative data from both the interviews and the survey highlight possible implementation obstacles: competing interests with other conservation actions and the l ...
... priority accorded to them, the money available and various practical obstacles all failed to explain the target levels achieved. However qualitative data from both the interviews and the survey highlight possible implementation obstacles: competing interests with other conservation actions and the l ...
Managing proteCted areas For BiologiCal diversitY and
... Biological diversity, or biodiversity for short, means the variability among living organisms from all sources including terrestrial, marine and other aquatic ecosystems and the ecological complexes of which they are part; this includes diversity within species, between species and of ecosystems. Bi ...
... Biological diversity, or biodiversity for short, means the variability among living organisms from all sources including terrestrial, marine and other aquatic ecosystems and the ecological complexes of which they are part; this includes diversity within species, between species and of ecosystems. Bi ...
keeping options alive - World Resources Report
... "conservation" has a narrower meaningmaintenance or preservation. But "maintenance" or "preservation" seem most useful when confined to practices that keep an ecosystem or population in its existing state. The broader definition used here, in contrast, entails a variety of objectives. A national bio ...
... "conservation" has a narrower meaningmaintenance or preservation. But "maintenance" or "preservation" seem most useful when confined to practices that keep an ecosystem or population in its existing state. The broader definition used here, in contrast, entails a variety of objectives. A national bio ...
eucalyptus porosa grassy woodlands
... Dead and fallen timber is known to provide critical habitat for a large number of mammals, birds, reptiles and invertebrates. Unfortunately, many people still have the misconception that dead trees and fallen branches are only useful as firewood or should at least be tidied up. Leaving dead trees an ...
... Dead and fallen timber is known to provide critical habitat for a large number of mammals, birds, reptiles and invertebrates. Unfortunately, many people still have the misconception that dead trees and fallen branches are only useful as firewood or should at least be tidied up. Leaving dead trees an ...
Evolution of Lake Malawi Cichlid Fishes (Perciformes: Teleostei)
... almost all of the endemic cichlid species and genera of Malawi and Victoria originated within the lakes proper (Mayr 1984); intralacustrine speciation is extensive in Tanganyika, though this lake was clearly seeded several times (Sturmbauer et al. 1997). However, despite a wealth of recent theoretic ...
... almost all of the endemic cichlid species and genera of Malawi and Victoria originated within the lakes proper (Mayr 1984); intralacustrine speciation is extensive in Tanganyika, though this lake was clearly seeded several times (Sturmbauer et al. 1997). However, despite a wealth of recent theoretic ...
Island restoration
The ecological restoration of islands, or island restoration, is the application of the principles of ecological restoration to islands and island groups. Islands, due to their isolation, are home to many of the world's endemic species, as well as important breeding grounds for seabirds and some marine mammals. Their ecosystems are also very vulnerable to human disturbance and particularly to introduced species, due to their small size. Island groups such as New Zealand and Hawaii have undergone substantial extinctions and losses of habitat. Since the 1950s several organisations and government agencies around the world have worked to restore islands to their original states; New Zealand has used them to hold natural populations of species that would otherwise be unable to survive in the wild. The principal components of island restoration are the removal of introduced species and the reintroduction of native species.