Thresholds of Potential Concern - Learning Center of the American
... invasive plants in Kruger National Park has been undergoing a shift in recent years from a command and control approach (Holling and Meffe 1996) based on the “balance of nature” paradigm of to a more proactive adaptive management philosophy emphasizing biodiversity as a primary goal for KNP (Foxcrof ...
... invasive plants in Kruger National Park has been undergoing a shift in recent years from a command and control approach (Holling and Meffe 1996) based on the “balance of nature” paradigm of to a more proactive adaptive management philosophy emphasizing biodiversity as a primary goal for KNP (Foxcrof ...
Chapter 10 Amphibians
... amount of information available on the Malagasy herpetofauna has increased substantially. In the period between 1990 and 1999, more new species of amphibians were described from Madagascar than in any decade before (Glaw and Vences 2000a). Currently, 199 Malagasy amphibian species are recognized, bu ...
... amount of information available on the Malagasy herpetofauna has increased substantially. In the period between 1990 and 1999, more new species of amphibians were described from Madagascar than in any decade before (Glaw and Vences 2000a). Currently, 199 Malagasy amphibian species are recognized, bu ...
habitat management guidelines for amphibians and reptiles of the
... It does not create or dictate policy. Rather, it provides recommendations and guidelines based on sound science. It is intended to increase communication and cooperation with many diverse groups who have a common interest in amphibians, reptiles, and their habitats. Through documents such as this, P ...
... It does not create or dictate policy. Rather, it provides recommendations and guidelines based on sound science. It is intended to increase communication and cooperation with many diverse groups who have a common interest in amphibians, reptiles, and their habitats. Through documents such as this, P ...
Competition among native and invasive Impatiens species: the roles
... immediately after introduction into a new range the species need to cope with the local environment, especially climatic conditions (Wiens and Graham 2005), later on different mechanisms involving interactions, or their absence, with resident biota come into play. It has been suggested that some inv ...
... immediately after introduction into a new range the species need to cope with the local environment, especially climatic conditions (Wiens and Graham 2005), later on different mechanisms involving interactions, or their absence, with resident biota come into play. It has been suggested that some inv ...
Tabby Go Home
... of all the wildlife affected by urban development and habitat fragmentation, it is the predators that are most vulnerable to local extinction due to their relatively large home ranges, low densities, and "control" (eradication) by their human neighbors. Unless strong reasons exist to do otherwise (s ...
... of all the wildlife affected by urban development and habitat fragmentation, it is the predators that are most vulnerable to local extinction due to their relatively large home ranges, low densities, and "control" (eradication) by their human neighbors. Unless strong reasons exist to do otherwise (s ...
Imported Pathogen: Woolly Adelgid Ecosystem Response
... has concerned the question of whether individual plant or animal species may play a critical role m controlling ecosystem processes and determining major community characteristics-that is, are there really "keystone" species ? In an era when species are being driven either locally or globally extinc ...
... has concerned the question of whether individual plant or animal species may play a critical role m controlling ecosystem processes and determining major community characteristics-that is, are there really "keystone" species ? In an era when species are being driven either locally or globally extinc ...
A World at Your Feet Teachers Guide
... In many parts of the world, the native grassland region is becoming nonexistent. Although Alberta has experienced large losses of native prairie habitat, approximately 40% still exists in an area called the Palliser Triangle. What has happened to the remaining 60% of the native prairie? In the past ...
... In many parts of the world, the native grassland region is becoming nonexistent. Although Alberta has experienced large losses of native prairie habitat, approximately 40% still exists in an area called the Palliser Triangle. What has happened to the remaining 60% of the native prairie? In the past ...
Part I: chapters, but I will cover them rapidly. The outlines will be
... A population ecologist wished to determine the size of a population of white-footed deer mice, Peromyscus leucopus, in a 1-hectare field. Her first trapping yielded 80 mice, all of which were marked with a dab of purple hair dye on the back of the neck. Two weeks later, the trapping was repeated. Th ...
... A population ecologist wished to determine the size of a population of white-footed deer mice, Peromyscus leucopus, in a 1-hectare field. Her first trapping yielded 80 mice, all of which were marked with a dab of purple hair dye on the back of the neck. Two weeks later, the trapping was repeated. Th ...
Community Patterns in Source
... Chesson 1985; Iwasa and Roughgarden 1986; Mouquet and Loreau 2002) and classical Lotka-Voltera competition models (Levin 1974; Amarasekare and Nisbet 2001). These studies have provided strong evidence that the regional dimension of species interactions could promote the local coexistence of competin ...
... Chesson 1985; Iwasa and Roughgarden 1986; Mouquet and Loreau 2002) and classical Lotka-Voltera competition models (Levin 1974; Amarasekare and Nisbet 2001). These studies have provided strong evidence that the regional dimension of species interactions could promote the local coexistence of competin ...
File
... An obligate mutualism is an interaction in which at least one species cannot survive without the presence of the other species; a facultative mutualism is an interaction that benefits both species but is not required by either species. One reason facultative mutualism is more common is that a) in a ...
... An obligate mutualism is an interaction in which at least one species cannot survive without the presence of the other species; a facultative mutualism is an interaction that benefits both species but is not required by either species. One reason facultative mutualism is more common is that a) in a ...
Grasshopper
... Although most grasshoppers are herbivorous, only a few species are important economically as crop pests. Some grasshoppers are adapted to specialized habitats. The South American Marellia remipes spends most of its life on floating vegetation and actively swims and lays eggs on underwater aquatic pl ...
... Although most grasshoppers are herbivorous, only a few species are important economically as crop pests. Some grasshoppers are adapted to specialized habitats. The South American Marellia remipes spends most of its life on floating vegetation and actively swims and lays eggs on underwater aquatic pl ...
Turtles of Michigan - The City of Ann Arbor
... Turtles are reptiles, belonging to the same class as lizards, snakes, and crocodiles. They are lung-breathing, vertebrate animals with dry scales on their skin, claws on their feet, and shells covering most of their body. Turtles live in wetlands, lakes, forests, and even retention ponds, but can tr ...
... Turtles are reptiles, belonging to the same class as lizards, snakes, and crocodiles. They are lung-breathing, vertebrate animals with dry scales on their skin, claws on their feet, and shells covering most of their body. Turtles live in wetlands, lakes, forests, and even retention ponds, but can tr ...
European Code of Conduct on Zoological Gardens and
... most important direct drivers of biodiversity loss and ecosystem service changes. IAS are widely recognised as a major threat to biodiversity on a global scale - together with overexploitation, pollution, habitat destruction and climate change - and the greatest threat to fragile ecosystems such as ...
... most important direct drivers of biodiversity loss and ecosystem service changes. IAS are widely recognised as a major threat to biodiversity on a global scale - together with overexploitation, pollution, habitat destruction and climate change - and the greatest threat to fragile ecosystems such as ...
An updated briefing about Giant Squid
... forsaking smaller prey of relatively low trophic status in favour of larger prey of higher status as they age. ...
... forsaking smaller prey of relatively low trophic status in favour of larger prey of higher status as they age. ...
Colonization in metapopulations: a review of
... In metapopulation dynamics turnover of populations in isolated patches may be frequent. Regional survival of a species in such a system with frequent extinctions hinges on its colonization ability. Colonization is more than just dispersal; when a propagule reaches a new patch i t Faces higher extinc ...
... In metapopulation dynamics turnover of populations in isolated patches may be frequent. Regional survival of a species in such a system with frequent extinctions hinges on its colonization ability. Colonization is more than just dispersal; when a propagule reaches a new patch i t Faces higher extinc ...
Arion vulgaris - the aetiology of an invasive species
... (WIKTOR 2004). Mating occurs when slugs are in the male phase, from July to October, and copulation is a very complex process that can last as long as 4-5 h (KOZŁOWSKI 2007, ROTH et al. 2012, DREIJERS et al. 2013). Slugs begin to lay eggs after maturing to the non-mating female phase (two to four we ...
... (WIKTOR 2004). Mating occurs when slugs are in the male phase, from July to October, and copulation is a very complex process that can last as long as 4-5 h (KOZŁOWSKI 2007, ROTH et al. 2012, DREIJERS et al. 2013). Slugs begin to lay eggs after maturing to the non-mating female phase (two to four we ...
Forest herb colonization of postagricultural forests in central New
... In June–August 1994, forest herbs were sampled in the paired stands at all 25 sites. Within each forest stand (postagricultural or old-woods) at a site, the presence of each forest herb species was recorded for 60 plots along three parallel transects at 25 m, 40 m and 55 m from the edge between the ...
... In June–August 1994, forest herbs were sampled in the paired stands at all 25 sites. Within each forest stand (postagricultural or old-woods) at a site, the presence of each forest herb species was recorded for 60 plots along three parallel transects at 25 m, 40 m and 55 m from the edge between the ...
smooth cordgrass Spartina alterniflora Loisel.
... circular growth pattern. Seeds cannot withstand desiccation and remain viable for only 8 to 12 months; these species do not have persistent seed banks (Daehler 2000, Daehler and Strong 1994, WAPMS 2004). Role of disturbance in establishment: Cordgrass readily colonizes unvegetated intertidal areas. ...
... circular growth pattern. Seeds cannot withstand desiccation and remain viable for only 8 to 12 months; these species do not have persistent seed banks (Daehler 2000, Daehler and Strong 1994, WAPMS 2004). Role of disturbance in establishment: Cordgrass readily colonizes unvegetated intertidal areas. ...
Amphibians of Jamaica
... Two species with SVL up to 40 mm • Genus Osteopilus: one species, SVL up to 80 mm • Genus Calyptahyla: one species, SVL up to 80 mm Some authors consider all four Jamaican hylid frogs to be Osteopilus. ...
... Two species with SVL up to 40 mm • Genus Osteopilus: one species, SVL up to 80 mm • Genus Calyptahyla: one species, SVL up to 80 mm Some authors consider all four Jamaican hylid frogs to be Osteopilus. ...
A snapshot of the Lesser Kestrel
... For six Lesser Kestrel colonies, walls in existing structures were repaired, new holes were opened and nest boxes and clay pots were made available. An additional 21 colonies ...
... For six Lesser Kestrel colonies, walls in existing structures were repaired, new holes were opened and nest boxes and clay pots were made available. An additional 21 colonies ...
How many species of host-specific insects feed on a species of
... 1990). Thomas (1990) further contended that tropical plants do share certain insect species and that Erwin’s estimates must be corrected accordingly. Most authors commented on the actual value of the proportion of specialist insect species that depend on a particular tree species, but few addressed ...
... 1990). Thomas (1990) further contended that tropical plants do share certain insect species and that Erwin’s estimates must be corrected accordingly. Most authors commented on the actual value of the proportion of specialist insect species that depend on a particular tree species, but few addressed ...
Summary of Scientific Findings on Roads and Aquatic Ecosystems
... timed relative to storm patterns (Swift 1984, 1988). This pattern is not unique to the East. There has been a progressive degradation of road drainage structures and function in the Columbia River Basin (Lee et al. 1997) and about 60% of all National Forest System roads are not fully maintained to ...
... timed relative to storm patterns (Swift 1984, 1988). This pattern is not unique to the East. There has been a progressive degradation of road drainage structures and function in the Columbia River Basin (Lee et al. 1997) and about 60% of all National Forest System roads are not fully maintained to ...
PETITION TO LIST THE ACUNA CACTUS
... implemented on the ground, nor are they being monitored. Three sites have had little to no survey work done and are only known to contain a few individuals at this time. Two of these, on lands administered by the Bureau of Land Management, were located as a result of survey work for desert tortoises ...
... implemented on the ground, nor are they being monitored. Three sites have had little to no survey work done and are only known to contain a few individuals at this time. Two of these, on lands administered by the Bureau of Land Management, were located as a result of survey work for desert tortoises ...
Multiple scale composition and spatial distribution patterns of the
... the southern boreal presettlement forest in north-eastern Minnesota, United States of America. Data collected during the General Land Office Survey (GLO) between 1853 and 1917, represents 35 324 samples (each with 1–4 trees) in a 3.2 million-hectare landscape. Nine tree species contributed at least ...
... the southern boreal presettlement forest in north-eastern Minnesota, United States of America. Data collected during the General Land Office Survey (GLO) between 1853 and 1917, represents 35 324 samples (each with 1–4 trees) in a 3.2 million-hectare landscape. Nine tree species contributed at least ...
The Landscape Ecology of Invasive Spread
... scale” ( Urban et al. 1987 ); and (3) the study of the “effect of pattern on process” (Turner 1989). The first two definitions imply that a landscape is an area of broad spatial extent that occurs at a level of organization above ecosystems and communities (but below the biome) in the traditional ec ...
... scale” ( Urban et al. 1987 ); and (3) the study of the “effect of pattern on process” (Turner 1989). The first two definitions imply that a landscape is an area of broad spatial extent that occurs at a level of organization above ecosystems and communities (but below the biome) in the traditional ec ...
Habitat conservation
Habitat conservation is a land management practice that seeks to conserve, protect and restore habitat areas for wild plants and animals, especially conservation reliant species, and prevent their extinction, fragmentation or reduction in range. It is a priority of many groups that cannot be easily characterized in terms of any one ideology.