Relative importance of resource quantity, isolation and habitat
... the mean population density of P. coridon. We further reanalysed our data for each study year separately, but show the results only when different patterns emerged. Habitat isolation Habitat isolation was defined as the shortest distance to the nearest P. coridon population. Only patches with at lea ...
... the mean population density of P. coridon. We further reanalysed our data for each study year separately, but show the results only when different patterns emerged. Habitat isolation Habitat isolation was defined as the shortest distance to the nearest P. coridon population. Only patches with at lea ...
CRB_Monit_Frwk_2Nov09-both
... status and trend criteria, specifically Viable Salmonid Population (VSP) metrics (2) artificial production effectiveness, and (3) habitat effectiveness monitoring. These three are components of a broader monitoring framework for anadromous fish in the Columbia River Basin. The accuracy and precision ...
... status and trend criteria, specifically Viable Salmonid Population (VSP) metrics (2) artificial production effectiveness, and (3) habitat effectiveness monitoring. These three are components of a broader monitoring framework for anadromous fish in the Columbia River Basin. The accuracy and precision ...
as a PDF
... The snowshoe hare has a well-documented 10-yr cycle in North America's Boreal Forest; the Arctic hare probably has cyclic fluctuations of comparable periodicity, amplitude and geographic scope within the taiga of USSR. Arctic hare populations have a 3- to 4-yr cycle in the forests of Norway and Swed ...
... The snowshoe hare has a well-documented 10-yr cycle in North America's Boreal Forest; the Arctic hare probably has cyclic fluctuations of comparable periodicity, amplitude and geographic scope within the taiga of USSR. Arctic hare populations have a 3- to 4-yr cycle in the forests of Norway and Swed ...
. Red Swamp Crayfish, Procambarus clarkii Overview Overview
... Studies in Spain and Portugal indicate that small mammals such as red fox and otter, large birds including herons and storks, and fish such as pike and bass predate red swamp crayfish. In Britain it is believed that eels could be important predators. ...
... Studies in Spain and Portugal indicate that small mammals such as red fox and otter, large birds including herons and storks, and fish such as pike and bass predate red swamp crayfish. In Britain it is believed that eels could be important predators. ...
Significant Wildlife Habitat Criteria Schedules For Ecoregion 3E
... Seasonal Concentration Areas are areas where wildlife species occur annually in numbers at certain times of the year, sometimes highly concentrated within relatively small areas. In spring and autumn, migratory wildlife species will concentrate where they can rest and feed. Other wildlife species re ...
... Seasonal Concentration Areas are areas where wildlife species occur annually in numbers at certain times of the year, sometimes highly concentrated within relatively small areas. In spring and autumn, migratory wildlife species will concentrate where they can rest and feed. Other wildlife species re ...
Confounding factors in the detection of species responses to habitat
... We show that confounding factors can mask many fragmentation effects. For instance, there are multiple ways in which species traits like trophic level, dispersal ability and degree of habitat specialisation influence specieslevel responses. The temporal scale of investigation may have a strong influenc ...
... We show that confounding factors can mask many fragmentation effects. For instance, there are multiple ways in which species traits like trophic level, dispersal ability and degree of habitat specialisation influence specieslevel responses. The temporal scale of investigation may have a strong influenc ...
Cane Toad
... Calauang and Pila in Laguna Province, and in the Central Luzon provinces. Within seven years they had become common in these areas. Other introductions to Philippine islands occurred between 1936-1950. By 1949, the toad had spread from Luzon to southern Mindanao, spreading both naturally and with hu ...
... Calauang and Pila in Laguna Province, and in the Central Luzon provinces. Within seven years they had become common in these areas. Other introductions to Philippine islands occurred between 1936-1950. By 1949, the toad had spread from Luzon to southern Mindanao, spreading both naturally and with hu ...
The iconic keystone predator has a pathogen
... But what happens when a keystone predator is threatened by an important new enemy? In recent years, a pathogen of seastars has swept through the northeast Pacific Ocean. Once its characteristic lesions are observed on infected individuals (Figure 2), seastar populations (including those of Pisaster) ...
... But what happens when a keystone predator is threatened by an important new enemy? In recent years, a pathogen of seastars has swept through the northeast Pacific Ocean. Once its characteristic lesions are observed on infected individuals (Figure 2), seastar populations (including those of Pisaster) ...
Management Plan for the Banded Killifish
... area of occupancy, clustered distribution pattern and inability for range expansion makes the species particularly sensitive to catastrophic events or localized perturbations. The Committee on the Status of Endangered Wildlife in Canada (COSEWIC) has identified potential impacts from forestry activi ...
... area of occupancy, clustered distribution pattern and inability for range expansion makes the species particularly sensitive to catastrophic events or localized perturbations. The Committee on the Status of Endangered Wildlife in Canada (COSEWIC) has identified potential impacts from forestry activi ...
Ecological Divergence and Reproductive Isolation in an Amazonian
... species. In contrast temperate North America, Europe and Asia combined support only 1,166 tree species. In the western Amazon rainforest, complex patterns of edaphic heterogeneity have been invoked as potential drivers of plant diversity through local. Numerous studies have demonstrated that physiol ...
... species. In contrast temperate North America, Europe and Asia combined support only 1,166 tree species. In the western Amazon rainforest, complex patterns of edaphic heterogeneity have been invoked as potential drivers of plant diversity through local. Numerous studies have demonstrated that physiol ...
Habitat Loss and Fragmentation
... on multiple food sources than the abundance of beetles that relied on a single food source. They hypothesized that this occurred because the specialist feeders were each limited to specific stand types within a forest and the generalist feeders were more tightly associated with forest cover in gener ...
... on multiple food sources than the abundance of beetles that relied on a single food source. They hypothesized that this occurred because the specialist feeders were each limited to specific stand types within a forest and the generalist feeders were more tightly associated with forest cover in gener ...
Ecotones and Ecological Gradients
... There have been multiple studies on patterns of biodiversity in ecotonal areas, which have led to a range of results. Recent work is providing increasing evidence that boundary regions between ecological communities can be highly diverse at both the within-species and community levels. Ecotones have ...
... There have been multiple studies on patterns of biodiversity in ecotonal areas, which have led to a range of results. Recent work is providing increasing evidence that boundary regions between ecological communities can be highly diverse at both the within-species and community levels. Ecotones have ...
Daviesia ovata 335.16 KB - Department of Parks and Wildlife
... soil-stored seed, however resprouting of some individuals has been observed and these commence flowering within two years. Flowering of plants that germinated from seed following fire in 2005 has not been observed to date, however grazing has been significant. Firebreak maintenance is a potential th ...
... soil-stored seed, however resprouting of some individuals has been observed and these commence flowering within two years. Flowering of plants that germinated from seed following fire in 2005 has not been observed to date, however grazing has been significant. Firebreak maintenance is a potential th ...
hansen2011 - Montana State University
... plains habitats within the park. Both subpopulations are regulated by resident prey. Resident prey are relatively stable in the woodland habitats allowing this habitat to be a net exporter of lions. The plains habitats are subject to the vagaries of weather and migratory prey movements, and lions ca ...
... plains habitats within the park. Both subpopulations are regulated by resident prey. Resident prey are relatively stable in the woodland habitats allowing this habitat to be a net exporter of lions. The plains habitats are subject to the vagaries of weather and migratory prey movements, and lions ca ...
pdf reprint
... was some expectation that larger and more connected fragments would always harbor more species. This expectation was despite logic that showed why these theories may not be applicable, as the same theory could be used to predict that many small fragments of contrasting habitats may conserve more spe ...
... was some expectation that larger and more connected fragments would always harbor more species. This expectation was despite logic that showed why these theories may not be applicable, as the same theory could be used to predict that many small fragments of contrasting habitats may conserve more spe ...
Population Cycles in Forest Lepidoptera Revisited
... whether population cycles are determined by biotic or abiotic or by intrinsic or extrinsic factors has been hotly debated ever since Elton (1927). Initially, most research on insect cycles was carried out by field ecologists, who monitored populations over many generations. Their focus was primarily ...
... whether population cycles are determined by biotic or abiotic or by intrinsic or extrinsic factors has been hotly debated ever since Elton (1927). Initially, most research on insect cycles was carried out by field ecologists, who monitored populations over many generations. Their focus was primarily ...
Collection of Bait Organisms in Estuaries
... both these methods, sediment core disturbance is minimal when compared to the amount of sediment turnover using a spade or long blade. However, it is important to distinguish between the number of bait organisms removed and the longer term effects on the target species, associated benthic communitie ...
... both these methods, sediment core disturbance is minimal when compared to the amount of sediment turnover using a spade or long blade. However, it is important to distinguish between the number of bait organisms removed and the longer term effects on the target species, associated benthic communitie ...
Monitoring data from citizen-science programs
... The world’s grassland ecosystems are shaped in part by a key functional group of social, burrowing, herbivorous mammals. Through herbivory and ecosystem engineering they create distinctive and important habitats for many other species, thereby increasing biodiversity and habitat heterogeneity across ...
... The world’s grassland ecosystems are shaped in part by a key functional group of social, burrowing, herbivorous mammals. Through herbivory and ecosystem engineering they create distinctive and important habitats for many other species, thereby increasing biodiversity and habitat heterogeneity across ...
Lesson Overview
... Herbivore Effects Herbivory can also contribute to changes in population numbers. From a plant’s perspective, herbivores are predators. On parts of Isle Royale, large, dense moose populations can eat so much balsam fir that the population of these favorite food plants drops. When this happens, moose ...
... Herbivore Effects Herbivory can also contribute to changes in population numbers. From a plant’s perspective, herbivores are predators. On parts of Isle Royale, large, dense moose populations can eat so much balsam fir that the population of these favorite food plants drops. When this happens, moose ...
On chaos, transient chaos and ghosts in single population models
... models, very large population densities at time n can give place to very small population numbers at time n + 1. Moreover, there is a population density at time n, namely C , that leads to the maximum population density at n + 1. Two different dynamical regimes can be found for such systems: (i) per ...
... models, very large population densities at time n can give place to very small population numbers at time n + 1. Moreover, there is a population density at time n, namely C , that leads to the maximum population density at n + 1. Two different dynamical regimes can be found for such systems: (i) per ...
Biotic and Abiotic Controls in River and Stream Communities
... Without attempting to be comprehensive in our review, we discuss limits and limitations of our knowledge in these areas. We also suggest types of data and technological development that would advance our understanding. While we appreciate the value and need for empirical and comparative information, ...
... Without attempting to be comprehensive in our review, we discuss limits and limitations of our knowledge in these areas. We also suggest types of data and technological development that would advance our understanding. While we appreciate the value and need for empirical and comparative information, ...
What`s depleting Salmon Populations?
... them to travel than in cooler years. In addition to a delayed return to their spawning grounds, many of the fish experience reduced body size since more energy is required to cover the longer di ...
... them to travel than in cooler years. In addition to a delayed return to their spawning grounds, many of the fish experience reduced body size since more energy is required to cover the longer di ...
Western green lizard (Lacerta bilineata) - GB non
... could do it again at any time, and indeed could already have done so. The chances of other as-yet-undiscovered L. bilineata populations existing are probably quite high. It would probably take at least several years to discover any newly-established population, even with a well-developed herpetologi ...
... could do it again at any time, and indeed could already have done so. The chances of other as-yet-undiscovered L. bilineata populations existing are probably quite high. It would probably take at least several years to discover any newly-established population, even with a well-developed herpetologi ...
Snodgrass, J.W., Hopkins, W.A., Jackson, B.P., Baionno, J.A., and
... or died (301 d). Larvae exposed to mine sediments accumulated significant levels of Pb and Zn, whereas larvae exposed to CCWcontaminated sediment accumulated significant levels of As, Se, Sr, and V. Larvae exposed to mine sediments suffered sublethal effects in the form of reduced growth and size at ...
... or died (301 d). Larvae exposed to mine sediments accumulated significant levels of Pb and Zn, whereas larvae exposed to CCWcontaminated sediment accumulated significant levels of As, Se, Sr, and V. Larvae exposed to mine sediments suffered sublethal effects in the form of reduced growth and size at ...
Decline in amphibian populations
Since the 1980s, declines in amphibian populations, including population crashes and mass localized extinctions, have been noted from locations all over the world. These declines are perceived as one of the most critical threats to global biodiversity, and several causes are believed to be involved, including disease, habitat destruction and modification, exploitation, pollution, pesticide use, introduced species, and ultraviolet-B radiation (UV-B). However, many of the causes of amphibian declines are still poorly understood, and the topic is currently a subject of much ongoing research. Calculations based on extinction rates suggest that the current extinction rate of amphibians could be 211 times greater than the background extinction rate and the estimate goes up to 25,000–45,000 times if endangered species are also included in the computation.