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... not too short times and becomes quite good for asymptotic times [32]. Using simulations it can be shown that all these simplifications do not destroy EN: clumps and gaps for SRA remain in the case of a finite linear niche axis no matter whether the niche is non-periodic (i.e., it has borders), or th ...
... not too short times and becomes quite good for asymptotic times [32]. Using simulations it can be shown that all these simplifications do not destroy EN: clumps and gaps for SRA remain in the case of a finite linear niche axis no matter whether the niche is non-periodic (i.e., it has borders), or th ...
complementary feeding niches sustained by size
... supports the hypothesis that one predator population can sustain another as a result of sizeselective predation on the prey of both predators. A highly selective predator excludes its preferred (large) food items and thus favors the presence of suboptimal (smaller-sized) prey populations which are t ...
... supports the hypothesis that one predator population can sustain another as a result of sizeselective predation on the prey of both predators. A highly selective predator excludes its preferred (large) food items and thus favors the presence of suboptimal (smaller-sized) prey populations which are t ...
woody debris in a mixed-oak forest of southern
... Bryophytes are a ubiquitous component of forested ecosystems, but little is known about their community composition and the factors that influence their distribution in many forest types. The goals of this investigation were to identify the members of the bryophyte community found on woody debris in ...
... Bryophytes are a ubiquitous component of forested ecosystems, but little is known about their community composition and the factors that influence their distribution in many forest types. The goals of this investigation were to identify the members of the bryophyte community found on woody debris in ...
Are invasive species a major cause of extinctions?
... Resources (IUCN) Red List [8] for species threatened worldwide. We examined these two sources to evaluate some of the widespread assumptions about invasion and extinction. Generalizing from available information on threats These and other similar data sets are invaluable assets in efforts to begin t ...
... Resources (IUCN) Red List [8] for species threatened worldwide. We examined these two sources to evaluate some of the widespread assumptions about invasion and extinction. Generalizing from available information on threats These and other similar data sets are invaluable assets in efforts to begin t ...
Unit 9 Ecology Chp 54 Community Ecology Notes
... The common spiny mouse (Acomys cahirinus) and the golden spiny mouse (A. russatus) share similar microhabitats and food sources. o Where they co-occur, A. cahirinus is nocturnal (active at night), while A. russatus is diurnal (active during the day). o Laboratory researchers have found that A. russa ...
... The common spiny mouse (Acomys cahirinus) and the golden spiny mouse (A. russatus) share similar microhabitats and food sources. o Where they co-occur, A. cahirinus is nocturnal (active at night), while A. russatus is diurnal (active during the day). o Laboratory researchers have found that A. russa ...
Bornean Orangutans are now officially Critically
... species and its forest habitat would be hugely detrimental to local economies. We can also expect that orangutan extinction would tarnish considerably the international image of both range countries, and would trigger global criticism against industries, practices and parties who are perceived as be ...
... species and its forest habitat would be hugely detrimental to local economies. We can also expect that orangutan extinction would tarnish considerably the international image of both range countries, and would trigger global criticism against industries, practices and parties who are perceived as be ...
Comments - Forest Isbell
... Liberal interpretations of AP as a means to identify and quantify species interactions may have resulted from ambiguous usage of the term ‘‘mechanism’’ in the BEF literature as well as in other areas of ecology. A ‘‘mechanism’’ denotes any lower-level process that contributes to generating a higher- ...
... Liberal interpretations of AP as a means to identify and quantify species interactions may have resulted from ambiguous usage of the term ‘‘mechanism’’ in the BEF literature as well as in other areas of ecology. A ‘‘mechanism’’ denotes any lower-level process that contributes to generating a higher- ...
of the competition kernel a(x)
... there are more opportunities for speciation there are fewer hazards and catastrophes more competitors can be packed closely climate is benign climate is more stable the environment is more complex (more readily subdivided) the environment is more productive there is heavy predation (giving low abund ...
... there are more opportunities for speciation there are fewer hazards and catastrophes more competitors can be packed closely climate is benign climate is more stable the environment is more complex (more readily subdivided) the environment is more productive there is heavy predation (giving low abund ...
Macroecology: more than the division of food and
... statistical analyses, they analysed the relationships between body mass, population density and geographical range. Specifically, their analysis predicted strong competition among species of similar size, higher extinction rates of larger species, and strong energetic constraints on smaller organism ...
... statistical analyses, they analysed the relationships between body mass, population density and geographical range. Specifically, their analysis predicted strong competition among species of similar size, higher extinction rates of larger species, and strong energetic constraints on smaller organism ...
File
... the size of the branches it perches on, the time of day when it is active, and the sizes and kinds of insects it eats. ...
... the size of the branches it perches on, the time of day when it is active, and the sizes and kinds of insects it eats. ...
The Problem of Research on Endangered Species: Are Experiments
... owls are specialist predators which concentrate on northern flying squirrels (Glaucomys sabrinus), bushy-tailed woodrats (Neotoma cinerea), and deer mice (Peromyscus maniculatus) (Forsman et al. 1984; Horoupian et al. 2000). Both owls are similar in size and appear to be susceptible to predation fro ...
... owls are specialist predators which concentrate on northern flying squirrels (Glaucomys sabrinus), bushy-tailed woodrats (Neotoma cinerea), and deer mice (Peromyscus maniculatus) (Forsman et al. 1984; Horoupian et al. 2000). Both owls are similar in size and appear to be susceptible to predation fro ...
Biodiversity and ecosystem functioning: It is time for dispersal
... The experimental study of the relationship between biodiversity and ecosystem function has mainly addressed the effect of species and number of functional groups. In theory, this approach has mainly focused on how extinction affects function, whereas dispersal limitation of ecosystem function has be ...
... The experimental study of the relationship between biodiversity and ecosystem function has mainly addressed the effect of species and number of functional groups. In theory, this approach has mainly focused on how extinction affects function, whereas dispersal limitation of ecosystem function has be ...
Are we in the midst of the sixth mass extinction? A view from the
... where we now stand in a relative sense. Our specific focus, however, is a taxon, the Class Amphibia. Amphibians have been studied intensively since biologists first became aware that we are witnessing a period of their severe global decline. Ironically, awareness of this phenomenon occurred at the s ...
... where we now stand in a relative sense. Our specific focus, however, is a taxon, the Class Amphibia. Amphibians have been studied intensively since biologists first became aware that we are witnessing a period of their severe global decline. Ironically, awareness of this phenomenon occurred at the s ...
The Ecology of Urban Forest Edges - National Center for Smart Growth
... natural areas that go deeper than the edge (Forman 2014). With fragmentation and destruction of core area, species loss can be explained based on edge-related factors. The division of land parcels creates even smaller sections of suitable habitat, limiting available resources. Remaining individuals ...
... natural areas that go deeper than the edge (Forman 2014). With fragmentation and destruction of core area, species loss can be explained based on edge-related factors. The division of land parcels creates even smaller sections of suitable habitat, limiting available resources. Remaining individuals ...
Mathematical Challenges in Spatial Ecology, Volume 48, Number 11
... a spatial model with local interactions is more appropriate and can result in predictions that differ from the well-mixed case. The two most frequently quoted and now classical studies that point to the central role of spatial subdivision are Andrewartha and Birch’s 1954 observations of insect popul ...
... a spatial model with local interactions is more appropriate and can result in predictions that differ from the well-mixed case. The two most frequently quoted and now classical studies that point to the central role of spatial subdivision are Andrewartha and Birch’s 1954 observations of insect popul ...
Recruitment and post-recruit immigration
... H. trimaculatus, and ¹halassoma lunare were not counted, as they were shy and cryptically colored; these species are not analysed in this study. Several groups of congeneric species were combined in the censuses, because the species in each group were similar in appearance. I aggregated the Apogonid ...
... H. trimaculatus, and ¹halassoma lunare were not counted, as they were shy and cryptically colored; these species are not analysed in this study. Several groups of congeneric species were combined in the censuses, because the species in each group were similar in appearance. I aggregated the Apogonid ...
Effects of predation and variation in species relative
... random immigration of individuals from a metacommunity to a community, with no dispersal limitation. Once we establish each neutral community, we simulate random birth, death, and migration, using the community dynamics algorithm described by Hubbell (2001). This algorithm has four parameters: 1) co ...
... random immigration of individuals from a metacommunity to a community, with no dispersal limitation. Once we establish each neutral community, we simulate random birth, death, and migration, using the community dynamics algorithm described by Hubbell (2001). This algorithm has four parameters: 1) co ...
Patterns of plants species diversity following local extinction of the
... on biotic]abiotic interactions. Species such as colonial, burrowing mammals that occur in high densities and occupy the same site for many years are particularly likely to induce long-term changes in communities and ecosystems (Lawton, 1994). For example, studies of black-tailed prairie dog ( Cynomy ...
... on biotic]abiotic interactions. Species such as colonial, burrowing mammals that occur in high densities and occupy the same site for many years are particularly likely to induce long-term changes in communities and ecosystems (Lawton, 1994). For example, studies of black-tailed prairie dog ( Cynomy ...
Patterns in the co-occurrence of fish species in streams: the role of
... Phylogenetic constraints or plasticity of species’ ecology may also influence species co-occurrences (Webb 2000; Silvertown et al. 2001). For these reasons, once a particular species co-occurrence pattern is detected, it is important to investigate further whether this pattern could have arisen for ...
... Phylogenetic constraints or plasticity of species’ ecology may also influence species co-occurrences (Webb 2000; Silvertown et al. 2001). For these reasons, once a particular species co-occurrence pattern is detected, it is important to investigate further whether this pattern could have arisen for ...
WILDLIFE CORRIDORS
... suggest that generalities regarding dimensions of corridors, such as a certain number of metres, are inadequate unless in a homogeneous landscape. They suggest that a more effective approach would be to take into account landform, topography, and the native vegetation present including composition, ...
... suggest that generalities regarding dimensions of corridors, such as a certain number of metres, are inadequate unless in a homogeneous landscape. They suggest that a more effective approach would be to take into account landform, topography, and the native vegetation present including composition, ...
Evolutionary diversification, coevolution between populations and
... their local habitats and partly to the distribution of populations over space within regions. Ecological niche modeling draws attention to the population niche as it is distributed across spatial environmental gradients, whereas phylogenetic community analysis emphasizes the evolutionary diversificat ...
... their local habitats and partly to the distribution of populations over space within regions. Ecological niche modeling draws attention to the population niche as it is distributed across spatial environmental gradients, whereas phylogenetic community analysis emphasizes the evolutionary diversificat ...
Two degrees of separation in complex food webs
... between cannibals, which have d ⫽ 1, and other species, which have d ⫽ 2. Our method alters D among our webs an average of ⬍1% compared with employing the more standard convention. Although there are hundreds of food webs in the literature, the vast majority have been criticized for being incomplete ...
... between cannibals, which have d ⫽ 1, and other species, which have d ⫽ 2. Our method alters D among our webs an average of ⬍1% compared with employing the more standard convention. Although there are hundreds of food webs in the literature, the vast majority have been criticized for being incomplete ...
Biodiversity, Extinction, and Humanity`s Future
... roughly one billion people who experience malnourishment today do so because of problems with food distribution [3]). However, in a future without a viable replacement for fossil fuels or some alternative means of sustainable food production, a lack of food will lead to increased death and/or decrea ...
... roughly one billion people who experience malnourishment today do so because of problems with food distribution [3]). However, in a future without a viable replacement for fossil fuels or some alternative means of sustainable food production, a lack of food will lead to increased death and/or decrea ...
Anthropogenic Disturbance and Edge Effects on
... generated Bray–Curtis similarity matrices for the amphibian data, using the normalized relative abundance of the species in each transect. Using these similarity matrices, we performed a non-parametric two-way analysis of similarity (ANOSIM subroutine) to test the hypotheses regarding the spatial di ...
... generated Bray–Curtis similarity matrices for the amphibian data, using the normalized relative abundance of the species in each transect. Using these similarity matrices, we performed a non-parametric two-way analysis of similarity (ANOSIM subroutine) to test the hypotheses regarding the spatial di ...
Breeding activity patterns, reproductive modes, and habitat use by
... Reproductive modes: (1) eggs and exotrophic tadpoles in lentic water; (8) foam nest and exotrophic tadpoles in lentic water; (18) eggs on leaves above water; exotrophic tadpoles in lentic water; (21) foam nest in subterranean chamber; exotrophic tadpoles in lentic water; (22) foam nest in subterrane ...
... Reproductive modes: (1) eggs and exotrophic tadpoles in lentic water; (8) foam nest and exotrophic tadpoles in lentic water; (18) eggs on leaves above water; exotrophic tadpoles in lentic water; (21) foam nest in subterranean chamber; exotrophic tadpoles in lentic water; (22) foam nest in subterrane ...