Extinction thresholds: insights from simple models
... The concept of extinction threshold illustrated by Eq. 6 is very general. Even when we have focused our discussion in a metapopulation context, models like Eq. 5 have been used in epidemiology, a comparison emphasized by Nee (1994), Lawton et al. (1994), and Bascompte and Rodríguez-Trelles (1998). I ...
... The concept of extinction threshold illustrated by Eq. 6 is very general. Even when we have focused our discussion in a metapopulation context, models like Eq. 5 have been used in epidemiology, a comparison emphasized by Nee (1994), Lawton et al. (1994), and Bascompte and Rodríguez-Trelles (1998). I ...
What role do birds play in dispersal of invasive plants? - SE-EPPC
... means that many seeds are not dispersed, and those that are dispersed may not make it very far. This could be a consideration if one were to attempt to model the speed at which Chinese tallow expands its range. Moreover, because this is a novel dispersal system, the naive native birds may have taken ...
... means that many seeds are not dispersed, and those that are dispersed may not make it very far. This could be a consideration if one were to attempt to model the speed at which Chinese tallow expands its range. Moreover, because this is a novel dispersal system, the naive native birds may have taken ...
MATING SYSTEMS, PHILOPATRY AND DISPERSAL IN BIRDS
... to individuals which have not yet reproduced, breeding dispersal to those which have reproduced. Such an unambiguous separation cannot always be made from the data available. This is particularly true for small mammals where the age, size or reproductive condition of a disperser does not necessarily ...
... to individuals which have not yet reproduced, breeding dispersal to those which have reproduced. Such an unambiguous separation cannot always be made from the data available. This is particularly true for small mammals where the age, size or reproductive condition of a disperser does not necessarily ...
Malleefowl Iconic Species Project
... population on Yathong NR; from past knowledge there may be up to 12 or 15 mounds active during a good breeding season. The SOS Iconic Species Project has the potential to monitor up to 15 mounds (i.e. up to 100% of the active population). Currently the project aims to capture data from an entire bre ...
... population on Yathong NR; from past knowledge there may be up to 12 or 15 mounds active during a good breeding season. The SOS Iconic Species Project has the potential to monitor up to 15 mounds (i.e. up to 100% of the active population). Currently the project aims to capture data from an entire bre ...
The dance of the invading jelly-fish
... the periodicity of such phenomena has been relatively well-known (sometimes several centuries!), the mechanisms involved are relatively unknown. It is to be noted that the physiology of these "Cnidaria", which are sometimes smaller than is generally thought, remains an important area for scientific ...
... the periodicity of such phenomena has been relatively well-known (sometimes several centuries!), the mechanisms involved are relatively unknown. It is to be noted that the physiology of these "Cnidaria", which are sometimes smaller than is generally thought, remains an important area for scientific ...
Habitat and habitat selection: theory, tests, and implications.
... semistabilized or stabilized habitat. The pattern of giving-up-densities in standard foraging patches revealed a greater cost of predation in stabilized habitat. The cost decayed with increasing density. Thus the gerbils appear to manage risk by exporting safety in numbers from one habitat to anothe ...
... semistabilized or stabilized habitat. The pattern of giving-up-densities in standard foraging patches revealed a greater cost of predation in stabilized habitat. The cost decayed with increasing density. Thus the gerbils appear to manage risk by exporting safety in numbers from one habitat to anothe ...
Two Perspectives on the Origin of the Standard Genetic Code
... and using the method of stepwise fragment condensation of the randomly generated 10-mers available in the library. Even in such cases, yields can be low depending upon the conditions, with the synthesized oligomers showing no similarity with known proteins. These results highlight the difficulty of ...
... and using the method of stepwise fragment condensation of the randomly generated 10-mers available in the library. Even in such cases, yields can be low depending upon the conditions, with the synthesized oligomers showing no similarity with known proteins. These results highlight the difficulty of ...
Adults - Gopher Tortoise Day
... look like in 2060 if the human population growth rate remains the same. Increases in development and human population will continue to cause habitat fragmentation and degradation. Additionally, disease and illegal harvest have also contributed to the gopher tortoise population decline. ...
... look like in 2060 if the human population growth rate remains the same. Increases in development and human population will continue to cause habitat fragmentation and degradation. Additionally, disease and illegal harvest have also contributed to the gopher tortoise population decline. ...
Are Species Adapted to Their Regeneration Niche, Adult Niche, or
... Species-specific leaf traits measured in the seedling, sapling, and adult stages were correlated to the crown exposure of 2-m-tall plants (the regeneration niche), the crown exposure at maximal height (the adult niche), and Hmax. This was done for all species combined and shade tolerants and pioneer ...
... Species-specific leaf traits measured in the seedling, sapling, and adult stages were correlated to the crown exposure of 2-m-tall plants (the regeneration niche), the crown exposure at maximal height (the adult niche), and Hmax. This was done for all species combined and shade tolerants and pioneer ...
Spatial patterns of an endemic Mediterranean palm recolonizing old
... Chamaerops humilis L. and determined their sex and sizes. We used techniques of spatial point pattern analysis (SPPA) to precisely quantify the spatial structure of these C. humilis populations. The objective was to identify potential processes generating the patterns and their likely consequences ...
... Chamaerops humilis L. and determined their sex and sizes. We used techniques of spatial point pattern analysis (SPPA) to precisely quantify the spatial structure of these C. humilis populations. The objective was to identify potential processes generating the patterns and their likely consequences ...
Common Name: TALLAPOOSA CRAYFISH Scientific Name
... respectively. No females with eggs have been collected. The largest female specimen collected is about 90 mm (3.5 inches) in length. Survey Recommendations: Since this species is usually found in swift water, it is most easily collected by holding a net perpendicular to the current downstream of a l ...
... respectively. No females with eggs have been collected. The largest female specimen collected is about 90 mm (3.5 inches) in length. Survey Recommendations: Since this species is usually found in swift water, it is most easily collected by holding a net perpendicular to the current downstream of a l ...
First Black-footed Ferret Born in New Mexico in 75 years
... The hatchlings were found by Rosalinda Palomo Ramos, a New Mexico State University graduate student, who is studying the diet of the tortoises. The three wild hatchlings have now joined seven of their 2009 siblings, which had hatched from eggs that were collected on the ranch and were then placed in ...
... The hatchlings were found by Rosalinda Palomo Ramos, a New Mexico State University graduate student, who is studying the diet of the tortoises. The three wild hatchlings have now joined seven of their 2009 siblings, which had hatched from eggs that were collected on the ranch and were then placed in ...
Chapter 44 Ecology of Populations Notes
... Population Density - Number of individuals per unit area or volume. Population Distribution - Pattern of dispersal of individuals within the area of interest. – Ecologists want to analyze and discover what causes the spatial and temporal “patchiness” of organisms. Limiting Factors are factors that ...
... Population Density - Number of individuals per unit area or volume. Population Distribution - Pattern of dispersal of individuals within the area of interest. – Ecologists want to analyze and discover what causes the spatial and temporal “patchiness” of organisms. Limiting Factors are factors that ...
Population Ecology
... Population Density - Number of individuals per unit area or volume. Population Distribution - Pattern of dispersal of individuals within the area of interest. – Ecologists want to analyze and discover what causes the spatial and temporal “patchiness” of organisms. Limiting Factors are factors that ...
... Population Density - Number of individuals per unit area or volume. Population Distribution - Pattern of dispersal of individuals within the area of interest. – Ecologists want to analyze and discover what causes the spatial and temporal “patchiness” of organisms. Limiting Factors are factors that ...
Scatter-and clump-dispersal and seedling demography
... of many plant species, resulting in dense clusters of establishing seeds and ultimately saplings (Alexandre 1978). Most clump-dispersal is by mammals, but some frugivorous birds commonly leave seeds in large clumps. Large flightless birds such as the cassowary (C. easuarius; 29-58 kg) and emu (Droma ...
... of many plant species, resulting in dense clusters of establishing seeds and ultimately saplings (Alexandre 1978). Most clump-dispersal is by mammals, but some frugivorous birds commonly leave seeds in large clumps. Large flightless birds such as the cassowary (C. easuarius; 29-58 kg) and emu (Droma ...
How Wild is Vild Campus - Det Natur
... When establishing urban nature, it is usually done with the purpose of raising the biodiversity in the city. The Vild Campus initiative, a part of the Center for Macro ecology, Evolution and Climate at Copenhagen University, created five biotopes with four different types of native habitat, a meadow ...
... When establishing urban nature, it is usually done with the purpose of raising the biodiversity in the city. The Vild Campus initiative, a part of the Center for Macro ecology, Evolution and Climate at Copenhagen University, created five biotopes with four different types of native habitat, a meadow ...
Towards a cohesive, holistic view of top predation: a definition
... vertebrate predators such as large diurnal raptors and owls, seabirds, herons, mammalian carnivores, cetaceans and pinnipeds, sharks and other large predatory fishes, as well as many large snakes, crocodiles and varanids. However, it also encompasses invertebrates in contexts in which they can exert ...
... vertebrate predators such as large diurnal raptors and owls, seabirds, herons, mammalian carnivores, cetaceans and pinnipeds, sharks and other large predatory fishes, as well as many large snakes, crocodiles and varanids. However, it also encompasses invertebrates in contexts in which they can exert ...
The sequence of the tms transcript 2 locus of the A. tumefaciens
... Whether or not the transcript 2 region is transcribed and translated in A. tumefaciens or has a role in the bacteria is unknown. However, the recent results of Schroder et.al.(34) suggest that this is a possibility. They have shown that the Hind III fragment 22e produces at low levels, a 49 Kd prote ...
... Whether or not the transcript 2 region is transcribed and translated in A. tumefaciens or has a role in the bacteria is unknown. However, the recent results of Schroder et.al.(34) suggest that this is a possibility. They have shown that the Hind III fragment 22e produces at low levels, a 49 Kd prote ...
Species Coexistence and Pathogens with
... in another species and perhaps to its extinction. Therefore, an epidemic on one species may result because of a contextual change in the community without any numerical or genetic change in the host or pathogen. Studying only the target species or the abiotic environment would not reveal the cause o ...
... in another species and perhaps to its extinction. Therefore, an epidemic on one species may result because of a contextual change in the community without any numerical or genetic change in the host or pathogen. Studying only the target species or the abiotic environment would not reveal the cause o ...
Studies and reconstructions of dire wolf (Canis dirus) and Grey wolf
... Canids have a relatively unreduced dental formula of 3142/3143 [numbers in sequence represent incisors, canines, premolars, and molars in the upper (left half before the oblique) and the lower (right half after the oblique) teeth] and relatively unmodified molars except for the morphology of the car ...
... Canids have a relatively unreduced dental formula of 3142/3143 [numbers in sequence represent incisors, canines, premolars, and molars in the upper (left half before the oblique) and the lower (right half after the oblique) teeth] and relatively unmodified molars except for the morphology of the car ...