File - Mr. Greening`s Science
... 26. Two different species of insect-eating birds feed and nest at different levels in the same evergreen tree. In this way they avoid A) predators ...
... 26. Two different species of insect-eating birds feed and nest at different levels in the same evergreen tree. In this way they avoid A) predators ...
THE IMPORTANCE OF ORGANIC DETRITUS IN LOTIC
... shredder populations associated not only with introduced litter traps, but in the streambed between traps. They concluded that resource limitation may be a decisive factor in controlling populations of invertebrates in low-order streams. On the practical consequences of the trophic interactions I ha ...
... shredder populations associated not only with introduced litter traps, but in the streambed between traps. They concluded that resource limitation may be a decisive factor in controlling populations of invertebrates in low-order streams. On the practical consequences of the trophic interactions I ha ...
752-4740-1-SP - Oecologia Australis
... observations on resource sharing. The reason for such studies seems to be the classical theory of competition, which predicted that two species could not occupy the same niche or coexist unless there were some differences in the way they used resources (Schoener 1982). During this period, many entom ...
... observations on resource sharing. The reason for such studies seems to be the classical theory of competition, which predicted that two species could not occupy the same niche or coexist unless there were some differences in the way they used resources (Schoener 1982). During this period, many entom ...
Meadow viper Vipera ursinii
... Loss of habitat is the principal cause of decline. Human persecution and illegal collection are also very important and may now be major threats in areas where at least the habitat is safeguarded. • Habitat destruction: This has been particularly important in lowland populations, where most of the s ...
... Loss of habitat is the principal cause of decline. Human persecution and illegal collection are also very important and may now be major threats in areas where at least the habitat is safeguarded. • Habitat destruction: This has been particularly important in lowland populations, where most of the s ...
Fulltext PDF
... particularly in the tropics, the search for keystone species in the food webs of different ecosystems is crucial in restoration ecology. Stiling [3] warns us, ‘however, we should remain aware of the potential pitfalls of the imperfectly known webs’. Hence, there is a need to study food webs in depth ...
... particularly in the tropics, the search for keystone species in the food webs of different ecosystems is crucial in restoration ecology. Stiling [3] warns us, ‘however, we should remain aware of the potential pitfalls of the imperfectly known webs’. Hence, there is a need to study food webs in depth ...
Chapter 18: Interactions of Living Things
... All organisms, from the smallest bacteria to a blue whale, interact with their environment. Ecology is the study of the interactions among organisms and their environment. Ecologists, such as the one in Figure 1, are scientists who study these relationships. Ecologists organize the environmental fac ...
... All organisms, from the smallest bacteria to a blue whale, interact with their environment. Ecology is the study of the interactions among organisms and their environment. Ecologists, such as the one in Figure 1, are scientists who study these relationships. Ecologists organize the environmental fac ...
SHIFTING PARADIGMS OF THE EVOLUTION OF CAVE LIFE
... for the estimation of selection coefficients using regression models. They did not measure overall selection but rather the components connected to mating and fecundity. Predictions can be made about the direction of natural selection in both cave and spring populations. Large size should be selecte ...
... for the estimation of selection coefficients using regression models. They did not measure overall selection but rather the components connected to mating and fecundity. Predictions can be made about the direction of natural selection in both cave and spring populations. Large size should be selecte ...
The biology and ecology of narrow endemic and
... Third, narrow endemic species may harbour significantly lower genetic diversity at the population level than their widespread congeners (Karron 1997, Gitzendanner and Soltis 2000). Hence, endemic species may exhibit reproductive traits likely to reduce outcrossing rates, such as fewer and smaller fl ...
... Third, narrow endemic species may harbour significantly lower genetic diversity at the population level than their widespread congeners (Karron 1997, Gitzendanner and Soltis 2000). Hence, endemic species may exhibit reproductive traits likely to reduce outcrossing rates, such as fewer and smaller fl ...
Grasshopper Outbreaks
... during years with above normal precipitation. Access to radiant heat from the sun is not limiting the grasshopper population growth at any time in these arid regions because of the relatively low vegetation canopy, however, the available food supply usually limits the grasshopper density except duri ...
... during years with above normal precipitation. Access to radiant heat from the sun is not limiting the grasshopper population growth at any time in these arid regions because of the relatively low vegetation canopy, however, the available food supply usually limits the grasshopper density except duri ...
Declining interspecific competition during character displacement
... indicate that the character displacement hypothesis is wrong or at best incomplete. For example, in the laboratory, benthics are more aggressive than intermediates (D. Schluter, personal observation), behaviour that may result in a strong impact on fitness of marines despite greater ecological diverg ...
... indicate that the character displacement hypothesis is wrong or at best incomplete. For example, in the laboratory, benthics are more aggressive than intermediates (D. Schluter, personal observation), behaviour that may result in a strong impact on fitness of marines despite greater ecological diverg ...
Tyto alba (Barn Owl) Prey Preference Based on
... sacrificed by the predator. (O’Donnell, 2013). Multiple studies on the flighted predator have shown no prey selection based on size or sex (Boonstra 1977; Vargas et al. 1988, as cited in Trejo and Guthmann 2003). Within birds, optimal foraging is either selective or opportunistic (Altringham 1996, a ...
... sacrificed by the predator. (O’Donnell, 2013). Multiple studies on the flighted predator have shown no prey selection based on size or sex (Boonstra 1977; Vargas et al. 1988, as cited in Trejo and Guthmann 2003). Within birds, optimal foraging is either selective or opportunistic (Altringham 1996, a ...
Query sequence
... and for each of those the derivation of a table of similar tripeptides: number is only fraction of total number possible. • Quickly scans a database of protein sequences for ungapped regions showing high similarity, which are called high-scoring segment pairs (HSP), using the tables of similar pepti ...
... and for each of those the derivation of a table of similar tripeptides: number is only fraction of total number possible. • Quickly scans a database of protein sequences for ungapped regions showing high similarity, which are called high-scoring segment pairs (HSP), using the tables of similar pepti ...
Ecology and conservation of small carnivores in tropical rainforests
... around each of these sites. Systematic monthly survey for scats was carried out in Sengaltheri during 1998 and 1999, and these data are analyzed separately. As the surveyed area was much larger than the home range of individual civets [10], and visits to the same trail were usually spaced many days ...
... around each of these sites. Systematic monthly survey for scats was carried out in Sengaltheri during 1998 and 1999, and these data are analyzed separately. As the surveyed area was much larger than the home range of individual civets [10], and visits to the same trail were usually spaced many days ...
Examining the Extinction of the Pleistocene Megafauna
... cycles to the changing environmental cycles. The “lost” time should have been used to produce offspring, but was instead wasted waiting for favorable breeding cues. This problem is magnified in large species with long gestation periods because more time is lost. Reduced reproductive success in these ...
... cycles to the changing environmental cycles. The “lost” time should have been used to produce offspring, but was instead wasted waiting for favorable breeding cues. This problem is magnified in large species with long gestation periods because more time is lost. Reduced reproductive success in these ...
Progress in Physical Geography
... rates of angiosperm diversification in the tropics. Diversification is not only present at the species level but also at higher taxonomic levels such as the family and genus (Chown and Gaston, 2000). This lends credence to a long time-frame of evolutionary change. Primitive tree species that are com ...
... rates of angiosperm diversification in the tropics. Diversification is not only present at the species level but also at higher taxonomic levels such as the family and genus (Chown and Gaston, 2000). This lends credence to a long time-frame of evolutionary change. Primitive tree species that are com ...
RG report - Norges forskningsråd
... Main objective To investigate the roles of environmental and social forces in shaping the current geographic variation in reindeer density and production in Finnmark and its consequenses for ecosystem sustainability. Subobjectives - To provide an analysis of spatial and temporal variation in reindee ...
... Main objective To investigate the roles of environmental and social forces in shaping the current geographic variation in reindeer density and production in Finnmark and its consequenses for ecosystem sustainability. Subobjectives - To provide an analysis of spatial and temporal variation in reindee ...
VonHolle_Simberloff_2005 - UCF College of Sciences
... the manipulated subplots along the flooding gradient. After a two-week period to allow for rerooting of the manipulated resident plants, the experimental subplots were planted with 10 adults and/or seedlings (,0.5 m) of individual invader species randomly chosen from widespread native and introduced ...
... the manipulated subplots along the flooding gradient. After a two-week period to allow for rerooting of the manipulated resident plants, the experimental subplots were planted with 10 adults and/or seedlings (,0.5 m) of individual invader species randomly chosen from widespread native and introduced ...
A Biodiversity Primer for Ontario
... Genetic diversity. It’s what fuels evolution – the variability among individuals within a species, based on variations in genes, that natural selection can act on. That variability increases the chance that a species will adapt to changing environmental conditions or impacts, since some individuals ...
... Genetic diversity. It’s what fuels evolution – the variability among individuals within a species, based on variations in genes, that natural selection can act on. That variability increases the chance that a species will adapt to changing environmental conditions or impacts, since some individuals ...
V C F
... 1. Determine what facets of the temperature regime (such as temperature maxima and averages) are biologically significant and what data must be collected to feed into developing metrics. 2. Develop a suite of metrics that characterize the suitability of the summer temperature regime for coldwater fi ...
... 1. Determine what facets of the temperature regime (such as temperature maxima and averages) are biologically significant and what data must be collected to feed into developing metrics. 2. Develop a suite of metrics that characterize the suitability of the summer temperature regime for coldwater fi ...
BioScience - Oxford Academic
... and function of many species may be altered through time via processes including domestication and hybridization, potentially leading to speciation events. We discuss the ecological and management importance of such possibilities, using gray wolves and other large carnivores as case studies. We iden ...
... and function of many species may be altered through time via processes including domestication and hybridization, potentially leading to speciation events. We discuss the ecological and management importance of such possibilities, using gray wolves and other large carnivores as case studies. We iden ...
Environmental Fitness for Sustained Population Dynamics
... sun light in the canopy of tropical forests may explain part of their observed diversity. But this cannot be the whole story. Complex behaviors appear even when there is no scarcity of resources. For example, bees may arguably compete against other insects for access to pollen. But this resource is ...
... sun light in the canopy of tropical forests may explain part of their observed diversity. But this cannot be the whole story. Complex behaviors appear even when there is no scarcity of resources. For example, bees may arguably compete against other insects for access to pollen. But this resource is ...
Will Small Population Sizes Warn Us of Impending Extinctions?
... deteriorating conditions (van Horne 1983; Doak 1994). Such knowledge is important, given the key role of population size in current schemes for classifying species as endangered (IUCN 2001) and because changes in numbers are the key measure used to quantify population viability in most situations (e ...
... deteriorating conditions (van Horne 1983; Doak 1994). Such knowledge is important, given the key role of population size in current schemes for classifying species as endangered (IUCN 2001) and because changes in numbers are the key measure used to quantify population viability in most situations (e ...
Chapter 55
... • Habitat fragmentation concerns biologists for several reasons: 1. Habitat fragmentation can reduce habitats to a size that is too small to support some species. 2. Fragmentation reduces the ability of individuals to disperse from one habitat to another. Small, isolated populations may be more vuln ...
... • Habitat fragmentation concerns biologists for several reasons: 1. Habitat fragmentation can reduce habitats to a size that is too small to support some species. 2. Fragmentation reduces the ability of individuals to disperse from one habitat to another. Small, isolated populations may be more vuln ...
Evolutionary responses to conditionality in species
... low gene flow along a stress gradient where interactions grade towards mutualistic. Beneficial ...
... low gene flow along a stress gradient where interactions grade towards mutualistic. Beneficial ...
Natural Selection and Ecological Speciation in Sticklebacks
... parasites, courtship costs, increased predation risk, etc.), and so those individuals that mate within their own population have a higher fitness. In contrast to reinforcement, here the fitness cost is borne by the mating individual and is not determined by the viability or fertility of its offspring. ...
... parasites, courtship costs, increased predation risk, etc.), and so those individuals that mate within their own population have a higher fitness. In contrast to reinforcement, here the fitness cost is borne by the mating individual and is not determined by the viability or fertility of its offspring. ...