ASPECTS OF HABITAT FRAGMENTATION – ANALYSING A
... recommended for monitoring habitat and vegetation structure, and the presence of indicators of local distinctiveness. We had applied this method along the main canal to observe the red duck. Aerial photographs can offer a convenient means of rapidly assessing these habitats. The methodology used to ...
... recommended for monitoring habitat and vegetation structure, and the presence of indicators of local distinctiveness. We had applied this method along the main canal to observe the red duck. Aerial photographs can offer a convenient means of rapidly assessing these habitats. The methodology used to ...
Population demographics and trade
... same sub-genus (Rubus), share many life-history characteristics, and often grow together in the same sites in the Pacific Northwest United States (PNW). A recent study compared the reproductive effort between these species (McDowell and Turner 2002). Reproduction in the noninvasive species was associa ...
... same sub-genus (Rubus), share many life-history characteristics, and often grow together in the same sites in the Pacific Northwest United States (PNW). A recent study compared the reproductive effort between these species (McDowell and Turner 2002). Reproduction in the noninvasive species was associa ...
Late Quaternary Extinctions: State of the Debate
... indirect (competition, habitat alteration) impacts, but that the timing and geography of extinction might have been different and the worldwide magnitude less, had not climatic change coincided with human impacts in many places. ...
... indirect (competition, habitat alteration) impacts, but that the timing and geography of extinction might have been different and the worldwide magnitude less, had not climatic change coincided with human impacts in many places. ...
sample
... from more than 20 different locations. Toads were collected from areas close to agriculture; both large-scale and small-scale farms as well as from suburbs. At collection sites where 50-97% of the adjacent land was farmed, males showed high levels of feminization. Feminized male toads were similar i ...
... from more than 20 different locations. Toads were collected from areas close to agriculture; both large-scale and small-scale farms as well as from suburbs. At collection sites where 50-97% of the adjacent land was farmed, males showed high levels of feminization. Feminized male toads were similar i ...
wildlife matters - Australian Wildlife Conservancy
... scientists, including several AWC ecologists, they have compiled the first ever review of the conservation status of all Australian terrestrial and marine mammals. It contains detailed species accounts for all threatened, near threatened and data deficient species as well as an overall analysis by t ...
... scientists, including several AWC ecologists, they have compiled the first ever review of the conservation status of all Australian terrestrial and marine mammals. It contains detailed species accounts for all threatened, near threatened and data deficient species as well as an overall analysis by t ...
Mesopredator Release and Prey Abundance: Reply to Litvaitis
... and raccoons because wolves were extirpated nearly two centuries ago. However, decline or extinction of other potential intraguild predators of foxes and raccoons should also have been considered before speculating on the subject. For example, foxes and raccoons could be killed by coyotes (RaIls & ...
... and raccoons because wolves were extirpated nearly two centuries ago. However, decline or extinction of other potential intraguild predators of foxes and raccoons should also have been considered before speculating on the subject. For example, foxes and raccoons could be killed by coyotes (RaIls & ...
DOC. SC37-29 - The Ramsar Convention on Wetlands
... Recalling that the conservation and wise use of waterbirds is a shared responsibility of nations and peoples and a common concern of humankind; Recalling also the long history of international cooperation for waterbird conservation developed over a hundred years with treaties such as that concerned ...
... Recalling that the conservation and wise use of waterbirds is a shared responsibility of nations and peoples and a common concern of humankind; Recalling also the long history of international cooperation for waterbird conservation developed over a hundred years with treaties such as that concerned ...
Allee effects, extinctions, and chaotic transients in simple population
... which a population persists for intermediate initial densities and otherwise goes extinct, extinction for all initial densities, and essential extinction in which ‘‘almost every’’ initial density leads to extinction. For fast-growing populations, these models show populations can persist at high lev ...
... which a population persists for intermediate initial densities and otherwise goes extinct, extinction for all initial densities, and essential extinction in which ‘‘almost every’’ initial density leads to extinction. For fast-growing populations, these models show populations can persist at high lev ...
climate change and connectivity: are corridors the solution?
... are considered in light of current and ongoing climatic changes like rising temperatures and an increased fluctuation in weather patterns. The chosen studies examine the different roles of corridors: immigration, movement, prevention of genetic drift, and reducing the effects of demographic stochast ...
... are considered in light of current and ongoing climatic changes like rising temperatures and an increased fluctuation in weather patterns. The chosen studies examine the different roles of corridors: immigration, movement, prevention of genetic drift, and reducing the effects of demographic stochast ...
- Wiley Online Library
... death adder Acanthophis praelongus and their feeding responses to cane toads. In the laboratory, death adders from all size classes and sexes readily consumed frogs and cane toads. Diets of free ranging A. praelongus from the Adelaide River floodplain were more heterogeneous. Juvenile snakes ate mai ...
... death adder Acanthophis praelongus and their feeding responses to cane toads. In the laboratory, death adders from all size classes and sexes readily consumed frogs and cane toads. Diets of free ranging A. praelongus from the Adelaide River floodplain were more heterogeneous. Juvenile snakes ate mai ...
Unit 5 test Answer Section
... B) a decrease in birth rates C) an increase in emigration D) a decrease in environmental pressures E) a reproductive time lag between birth and death rates Which of the following would exhibit primary succession? A) a rock exposed by a retreating glacier B) an abandoned farm C) a clear-cut forest D) ...
... B) a decrease in birth rates C) an increase in emigration D) a decrease in environmental pressures E) a reproductive time lag between birth and death rates Which of the following would exhibit primary succession? A) a rock exposed by a retreating glacier B) an abandoned farm C) a clear-cut forest D) ...
The controversy space on Quaternary megafaunal extinctions
... Controversy spaces are dynamic structures. The foci of discussion may change over time, a process called refocalization. This refocalization can occur for several reasons: a new actor may appear with a new hypothesis, a focus may become part of the common ground (as a result of agreements reached du ...
... Controversy spaces are dynamic structures. The foci of discussion may change over time, a process called refocalization. This refocalization can occur for several reasons: a new actor may appear with a new hypothesis, a focus may become part of the common ground (as a result of agreements reached du ...
The role of animal behaviour in the study of endocrine
... (…) In short, an animal’s behavioural integrity is a proxy of its health. Behavioural measures have another indisputable advantage over physiological or morphological bioindicators: the tools needed to evaluate behaviour are relatively inexpensive. Individual- and Population-level Effects of EDCs He ...
... (…) In short, an animal’s behavioural integrity is a proxy of its health. Behavioural measures have another indisputable advantage over physiological or morphological bioindicators: the tools needed to evaluate behaviour are relatively inexpensive. Individual- and Population-level Effects of EDCs He ...
application for
... State and Commonwealth laws. A species will only be considered as a candidate for translocation if possession of the species does not conflict with the restrictions imposed under the legislation. Such legislation may relate to the survival of a species or to the ecosystem in which it occurs or where ...
... State and Commonwealth laws. A species will only be considered as a candidate for translocation if possession of the species does not conflict with the restrictions imposed under the legislation. Such legislation may relate to the survival of a species or to the ecosystem in which it occurs or where ...
Gamebird hunting and biodiversity conservation: synthesis
... Strong differences between countries exist in relation to hunting patterns, main hunted species, and the socio-economic value of hunting. In this respect, it is worth highlighting the case of Finland, where hunting pressure and thus the economic importance of hunting is low. This is associated with ...
... Strong differences between countries exist in relation to hunting patterns, main hunted species, and the socio-economic value of hunting. In this respect, it is worth highlighting the case of Finland, where hunting pressure and thus the economic importance of hunting is low. This is associated with ...
Causes of Mass Extinctions - With Special Reference to Vanishing
... characteristics and occurrences of algae in modern aquatic environments and observations from the fossil record propose that toxin-producing algae were present in the geologic past and were an important factor in Phanerozoic mass extinctions. They suggested that the large mass of organic material pr ...
... characteristics and occurrences of algae in modern aquatic environments and observations from the fossil record propose that toxin-producing algae were present in the geologic past and were an important factor in Phanerozoic mass extinctions. They suggested that the large mass of organic material pr ...
Singlespecies metapopulation dynamics
... subpopulations”, and how “the consequences of this spreading of the risk in space will be a relative reduction in the amplitude of fluctuations of animal numbers in the entire population” (den Boer, 1968). The point Andrewartha & Birch (1954) and den Boer (1968) are making is the varying conditions ...
... subpopulations”, and how “the consequences of this spreading of the risk in space will be a relative reduction in the amplitude of fluctuations of animal numbers in the entire population” (den Boer, 1968). The point Andrewartha & Birch (1954) and den Boer (1968) are making is the varying conditions ...
Allee effects, extinctions, and chaotic transients in simple population
... Predator Saturation Perhaps the most common Allee effect occurs in species subject to predation by a generalist predator with a saturating functional response. Within such populations, an individual’s risk of predation decreases as the population’s density increases. The importance of this form of p ...
... Predator Saturation Perhaps the most common Allee effect occurs in species subject to predation by a generalist predator with a saturating functional response. Within such populations, an individual’s risk of predation decreases as the population’s density increases. The importance of this form of p ...
Plastic responses in juvenile wood frog (Rana sylvatica)
... traits (Relyea 2001, Miner 2005). The accelerated metamorphosis may have created a time lag in the appearance of plastic traits as found in Relyea and Hoverman’s (2003) study. The authors found that plastic effects were not displayed until a month after metamorphosis. A study conducted by Weider and ...
... traits (Relyea 2001, Miner 2005). The accelerated metamorphosis may have created a time lag in the appearance of plastic traits as found in Relyea and Hoverman’s (2003) study. The authors found that plastic effects were not displayed until a month after metamorphosis. A study conducted by Weider and ...
Range fragmentation of the spectacled bear Tremarctos ornatus in
... To estimate potential bear population sizes, we multiplied population densities by the surface area of the habitat blocks. As population density data are unavailable for the spectacled bear, we used data for other species of bear, assuming that ecological similarity justified extrapolation between s ...
... To estimate potential bear population sizes, we multiplied population densities by the surface area of the habitat blocks. As population density data are unavailable for the spectacled bear, we used data for other species of bear, assuming that ecological similarity justified extrapolation between s ...
Evaluating least-cost model predictions with empirical
... persist in human-dominated ecosystems because protected areas constitute a small fraction of the Earth's surface and because anthropogenic habitats may offer more opportunities for conservation than has been previously thought. We investigated how an important functional group, pollinators (bees; Hy ...
... persist in human-dominated ecosystems because protected areas constitute a small fraction of the Earth's surface and because anthropogenic habitats may offer more opportunities for conservation than has been previously thought. We investigated how an important functional group, pollinators (bees; Hy ...
DR on Adoption of Guidance and Definitions Rev1
... f. Whether disturbance effects ultimately impact on population size depends not only on whether these affect survival and/or reproductive success, but also whether density-dependent processes operate within the population. This will determine whether the population will ‘compensate’ for losses throu ...
... f. Whether disturbance effects ultimately impact on population size depends not only on whether these affect survival and/or reproductive success, but also whether density-dependent processes operate within the population. This will determine whether the population will ‘compensate’ for losses throu ...
15Diets, Foraging, and Interactions with Parasites and Predators
... for food (Crossland et al. 2006). Cannibalism provides benefits for adult males of the Puerto Rican frog Eleutherodactylus coqui. Parental male frogs guard their egg clutches, and other males opportunistically raid the nests and consume the eggs if the parental male is not present or is unable to de ...
... for food (Crossland et al. 2006). Cannibalism provides benefits for adult males of the Puerto Rican frog Eleutherodactylus coqui. Parental male frogs guard their egg clutches, and other males opportunistically raid the nests and consume the eggs if the parental male is not present or is unable to de ...
Predicting ecological consequences of marine top predator
... occur via direct predation (so-called lethal effects) on mesoconsumers. Using this framework, the effects of predation could be fully quantified based on the diets, metabolic rates and abundances of predators and data on prey population dynamics [18]. Declines in top predator abundance should releas ...
... occur via direct predation (so-called lethal effects) on mesoconsumers. Using this framework, the effects of predation could be fully quantified based on the diets, metabolic rates and abundances of predators and data on prey population dynamics [18]. Declines in top predator abundance should releas ...
Predicting ecological consequences of marine top predator declines
... occur via direct predation (so-called lethal effects) on mesoconsumers. Using this framework, the effects of predation could be fully quantified based on the diets, metabolic rates and abundances of predators and data on prey population dynamics [18]. Declines in top predator abundance should releas ...
... occur via direct predation (so-called lethal effects) on mesoconsumers. Using this framework, the effects of predation could be fully quantified based on the diets, metabolic rates and abundances of predators and data on prey population dynamics [18]. Declines in top predator abundance should releas ...
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.