Varanus acanthurus. Photo by Jeff Lemm.
... I ask readers to indulge me and permit some opinions and editorializing. The incomplete fossil record shows that lizards first appeared 150 million years ago—since then many clades have appeared and some have gone extinct (Evans 2003). The oldest varanoid fossils date from about 90 million years ago ...
... I ask readers to indulge me and permit some opinions and editorializing. The incomplete fossil record shows that lizards first appeared 150 million years ago—since then many clades have appeared and some have gone extinct (Evans 2003). The oldest varanoid fossils date from about 90 million years ago ...
Predictors of species sensitivity to fragmentation
... et al. 1994), few studies have directly tested this prediction (Table 3). These tests have yielded variable, controversial results. The hypothesis was supported by a study controlling variability experimentally and by a study that measured population variability for the same length of time for extan ...
... et al. 1994), few studies have directly tested this prediction (Table 3). These tests have yielded variable, controversial results. The hypothesis was supported by a study controlling variability experimentally and by a study that measured population variability for the same length of time for extan ...
“Human activities are generally concentrated in areas of high
... Metro Vancouver supports a diverse range of species. However, human activity over the past 150 years has significantly transformed the land and habitat value. Land use planning influences the amount, patch size, connectivity, and spatial distribution of natural habitat. Urban and suburban developmen ...
... Metro Vancouver supports a diverse range of species. However, human activity over the past 150 years has significantly transformed the land and habitat value. Land use planning influences the amount, patch size, connectivity, and spatial distribution of natural habitat. Urban and suburban developmen ...
Insect communities and biotic interactions on
... 2.1. Species diversity increases with habitat area and decreases with habitat isolation Although species–area relationships are generally a well known and often described ecological pattern, only a few studies of insect communities on calcareous grasslands exist. Zschokke et al. (2000) analysed shor ...
... 2.1. Species diversity increases with habitat area and decreases with habitat isolation Although species–area relationships are generally a well known and often described ecological pattern, only a few studies of insect communities on calcareous grasslands exist. Zschokke et al. (2000) analysed shor ...
a haunting legacy from isoclines: mammal
... Many of OUf concepts about species coexistence are rooted finnly in the analysis of competitor isoclines whose slopes estimate the average magnitude of competition. Realistically, competition will vary among habitats, and habitat selection will be a major contributor to coexistence. Competition will ...
... Many of OUf concepts about species coexistence are rooted finnly in the analysis of competitor isoclines whose slopes estimate the average magnitude of competition. Realistically, competition will vary among habitats, and habitat selection will be a major contributor to coexistence. Competition will ...
How stable are habitat associations through a breeding season?
... each observation. We ranked and compared models using Akaike’s information criterion corrected for small sample size (AICc, Hurvich and Tsai 1989) and included the model with the lowest AICc value in all subsequent models. Next, we modeled occupancy within the first survey period (i.e., initial occu ...
... each observation. We ranked and compared models using Akaike’s information criterion corrected for small sample size (AICc, Hurvich and Tsai 1989) and included the model with the lowest AICc value in all subsequent models. Next, we modeled occupancy within the first survey period (i.e., initial occu ...
Monitoring Wood Thrush Habitat using Geographical Information
... of the Wood Thrush. In smaller more confined habitats (< 2 hectares) less than 51% of females’ time produce more than 2 offspring. Whereas in larger habitats (~15 hectares) females produced a lot more young and have proven to be more successful. Studies also show that larger habitat patches have low ...
... of the Wood Thrush. In smaller more confined habitats (< 2 hectares) less than 51% of females’ time produce more than 2 offspring. Whereas in larger habitats (~15 hectares) females produced a lot more young and have proven to be more successful. Studies also show that larger habitat patches have low ...
Habitat use, selection and preference
... plant association may promote high fitness in one animal species but not another ...
... plant association may promote high fitness in one animal species but not another ...
8 Habitat matrix effects on the structure and dynamic
... The metacommunity perspective differs from metapopulation perspectives, in that the principal issue in metapopulation theory is to address what determines the persistence of a metapopulation in a system of connected habitats, whereas metacommunity studies address what regulates the coexistence of mu ...
... The metacommunity perspective differs from metapopulation perspectives, in that the principal issue in metapopulation theory is to address what determines the persistence of a metapopulation in a system of connected habitats, whereas metacommunity studies address what regulates the coexistence of mu ...
Cytologist_an_endgered_species-BAC_13-09
... – By then he had exceeded 10,000 hours of computer programming in previous 7 years ...
... – By then he had exceeded 10,000 hours of computer programming in previous 7 years ...
(Introduced) species
... are poorly understood by a lot of people, nature's “cogs and wheels” are going missing at an alarming rate — on the order of 100 to 1000 times the background rate, estimated from fossil records to be from one to ten species/year (Pimm, et al., 1995 and others). Some estimates of current rates are mu ...
... are poorly understood by a lot of people, nature's “cogs and wheels” are going missing at an alarming rate — on the order of 100 to 1000 times the background rate, estimated from fossil records to be from one to ten species/year (Pimm, et al., 1995 and others). Some estimates of current rates are mu ...
draft cover letter to science
... species in the history of life, humans cause extinctions, change ecosystems, and affect the very future of evolution (9-13), and they surely will continue to do so by default or design (14). Here, we outline an alternative vision for 21st century conservation biology that is based on our late Pleist ...
... species in the history of life, humans cause extinctions, change ecosystems, and affect the very future of evolution (9-13), and they surely will continue to do so by default or design (14). Here, we outline an alternative vision for 21st century conservation biology that is based on our late Pleist ...
Interspecific competition in metapopulations
... unambiguously shown that this is the case. In Tvarminne (Pajunen, 1986) as well as on the Swedish coast (Bengtsson, 1989), 10-20% of the populations became extinct each year, and colonizations of empty pools occurred at a similar rate. Although resting eggs of freshwater crustaceans can survive more ...
... unambiguously shown that this is the case. In Tvarminne (Pajunen, 1986) as well as on the Swedish coast (Bengtsson, 1989), 10-20% of the populations became extinct each year, and colonizations of empty pools occurred at a similar rate. Although resting eggs of freshwater crustaceans can survive more ...
SHALOM: a landscape simulation model for understanding animal
... each has a resource-proportion of 0.5). A patch is the area composed of all adjacent cells sharing a habitat type where the local-scale processes take place. Individuals of a species in one patch (population) interact among themselves independently of individuals in adjacent patches. Dispersal may ...
... each has a resource-proportion of 0.5). A patch is the area composed of all adjacent cells sharing a habitat type where the local-scale processes take place. Individuals of a species in one patch (population) interact among themselves independently of individuals in adjacent patches. Dispersal may ...
Community Ecology (Bio 3TT3) - McMaster Department of Biology
... while the realized niche is often seen as being reduced by biotic factors such as competition or predation. For example, leopards can and often do hunt during both the day and night. However, in areas of high lion density, a species that strongly competes with leopards and kills them whenever possib ...
... while the realized niche is often seen as being reduced by biotic factors such as competition or predation. For example, leopards can and often do hunt during both the day and night. However, in areas of high lion density, a species that strongly competes with leopards and kills them whenever possib ...
Habitat Selection
... • Use of different portions of the stream pools by large and small Notonecta appears to reflect compromises between selecting habitats with abundant food and avoiding cannibalistic predation by adults • Instars 1-3 avoid adults and forage at the edge while adults forage at the center of pools (and u ...
... • Use of different portions of the stream pools by large and small Notonecta appears to reflect compromises between selecting habitats with abundant food and avoiding cannibalistic predation by adults • Instars 1-3 avoid adults and forage at the edge while adults forage at the center of pools (and u ...
Moving beyond static species distribution models in support of
... applied in the case of shifting habitat under climate change. Several studies have used a cellular automata (CA) modelling framework for spatially explicit simulations of species migration in response to climate change effects on habitat distribution. CA models are matrix simulations that apply rule ...
... applied in the case of shifting habitat under climate change. Several studies have used a cellular automata (CA) modelling framework for spatially explicit simulations of species migration in response to climate change effects on habitat distribution. CA models are matrix simulations that apply rule ...
Reproductive dynamics of three amphibian species in
... 1. Although the influence of water availability and precipitation regimes on amphibians has been studied at large scales, whether and how interannual rainfall and hydrological variations affect amphibians dynamics at a local scale have rarely been addressed. In this respect, accounting for variation ...
... 1. Although the influence of water availability and precipitation regimes on amphibians has been studied at large scales, whether and how interannual rainfall and hydrological variations affect amphibians dynamics at a local scale have rarely been addressed. In this respect, accounting for variation ...
Life in the Aftermath of Mass Extinctions
... rates globally or in rarely to never fossilized clades. Even in well-fossilized clades, it can be difficult to assess whether a species is extinct or just rare, as rare species have a low chance of being discovered as fossils [14]. Consequently, at a global scale all that is known for certain is tha ...
... rates globally or in rarely to never fossilized clades. Even in well-fossilized clades, it can be difficult to assess whether a species is extinct or just rare, as rare species have a low chance of being discovered as fossils [14]. Consequently, at a global scale all that is known for certain is tha ...
Coupled Logistic Map for Symbiotic Relations
... A logistic map which describes the population dynamics of a species would be the most famous nonlinear difference equation. The map would have dual significance as an instructive example of the nonlinear dynamics and as an ecological model [1]. In spite of its simple form, it could show us the essen ...
... A logistic map which describes the population dynamics of a species would be the most famous nonlinear difference equation. The map would have dual significance as an instructive example of the nonlinear dynamics and as an ecological model [1]. In spite of its simple form, it could show us the essen ...
The Central American land bridge: evolution at work
... the increased isolation and divergence of species across the developing barrier and shifts in diversity due to differential extinction and origination rates. The study of past and present day communities and their relationships in such a well documented setup can be used for a better understanding o ...
... the increased isolation and divergence of species across the developing barrier and shifts in diversity due to differential extinction and origination rates. The study of past and present day communities and their relationships in such a well documented setup can be used for a better understanding o ...
The Phanerozoic Eon - Jutzi
... • Laurasia and Gondwanaland broke up into the today’s continents, but they were not yet in their present positions • The Cretaceous and the entire Mesozoic Era came to an end with an asteroid impact near the present‐day Yucatan Peninsula ...
... • Laurasia and Gondwanaland broke up into the today’s continents, but they were not yet in their present positions • The Cretaceous and the entire Mesozoic Era came to an end with an asteroid impact near the present‐day Yucatan Peninsula ...
Effect of Elevation and Type of Habitat on the Abundance and
... 2 points right and left of the bar at 1-m intervals. Total plant cover at each site was expressed as a percentage of contacts with vegetation. Also, plant cover (percentage) at different 10-cm-height intervals, from 0-10 cm to 250 cm and above, was estimated at each of the contacts mentioned above. ...
... 2 points right and left of the bar at 1-m intervals. Total plant cover at each site was expressed as a percentage of contacts with vegetation. Also, plant cover (percentage) at different 10-cm-height intervals, from 0-10 cm to 250 cm and above, was estimated at each of the contacts mentioned above. ...
The Extinction of the Glaucus Macaw
... macaws prefer to eat palm seeds that are slightly smaller than the width of the hard cutting surface of their lower mandibles. By measuring the chisel width of museum specimens of Glaucus Macaws, Yamashita predicted that they should have fed on palms less than about 19 mm in diameter. From studies o ...
... macaws prefer to eat palm seeds that are slightly smaller than the width of the hard cutting surface of their lower mandibles. By measuring the chisel width of museum specimens of Glaucus Macaws, Yamashita predicted that they should have fed on palms less than about 19 mm in diameter. From studies o ...
Small-mammal abundance at three elevations on a mountain in
... structure of forest ¯oor small mammals is limited. Mice of the genus Peromyscus are widespread across North America (Baker, 1968; Hooper, 1968; Smith, 1989) and across New England (DeGraaf and Rudis, 1987). They are among the most common, if not the most common small mammal in the northeastern decid ...
... structure of forest ¯oor small mammals is limited. Mice of the genus Peromyscus are widespread across North America (Baker, 1968; Hooper, 1968; Smith, 1989) and across New England (DeGraaf and Rudis, 1987). They are among the most common, if not the most common small mammal in the northeastern decid ...