![Mammalogy - Virginia Tech](http://s1.studyres.com/store/data/004591889_1-995bb9e6c4f854a7c44bdb0f30b4212e-300x300.png)
Mammalogy - Virginia Tech
... in most of the eastern United States since the early 1900s. The snowshoe hare is on the list; however, that species has not been recorded in several years. The common porcupine is not on the list. The occasional records of porcupines over the years likely represent vagrant individuals of this someti ...
... in most of the eastern United States since the early 1900s. The snowshoe hare is on the list; however, that species has not been recorded in several years. The common porcupine is not on the list. The occasional records of porcupines over the years likely represent vagrant individuals of this someti ...
Linking species abundance distributions and body size in
... however, it remains a better surrogate measure of body size than a linear measure such as length. Because monogeneans are flatworms and because the method used to flatten the worms before measurements was the same for all specimens, body surface area measured this way is a very close equivalent of b ...
... however, it remains a better surrogate measure of body size than a linear measure such as length. Because monogeneans are flatworms and because the method used to flatten the worms before measurements was the same for all specimens, body surface area measured this way is a very close equivalent of b ...
Dan Cogălniceanu • Biodiversity
... and famine. These major challenges to our well-being and even survival, despite being apparently unrelated, are all the result of our unfair, unsustainable way of life. History offers many examples of human societies that made major changes to their environment. They had to adapt to the changes they ...
... and famine. These major challenges to our well-being and even survival, despite being apparently unrelated, are all the result of our unfair, unsustainable way of life. History offers many examples of human societies that made major changes to their environment. They had to adapt to the changes they ...
Markov Chain Analysis of Succession in a Rocky Subtidal Community
... (e.g., Caswell and Cohen 1991a, 1991b). In another class of models, points are occupied by single individuals rather than populations. Such models have been applied to forests (Waggoner and Stephens 1970; Horn 1975; Runkle 1981; Masaki et al. 1992), plant communities (Isagi and Nakagoshi 1990; Aavik ...
... (e.g., Caswell and Cohen 1991a, 1991b). In another class of models, points are occupied by single individuals rather than populations. Such models have been applied to forests (Waggoner and Stephens 1970; Horn 1975; Runkle 1981; Masaki et al. 1992), plant communities (Isagi and Nakagoshi 1990; Aavik ...
can unwanted suburban tortoises rescue native hawaiian plants?
... island tortoises, but the niches were apparently still there. Giant flightless ducks and geese evolved on these islands with tortoise-like beaks and other adaptations as terrestrial “meso-herbivores.” Dating of these remarkable fossil remains shows that they went extinct soon after the arrival of Po ...
... island tortoises, but the niches were apparently still there. Giant flightless ducks and geese evolved on these islands with tortoise-like beaks and other adaptations as terrestrial “meso-herbivores.” Dating of these remarkable fossil remains shows that they went extinct soon after the arrival of Po ...
Host Plant Utilization by Grasshoppers
... Diet breadths for each grasshopper species are presented in Table 1. The average number of categories in the diet is 13.7 and the average value of B is 8.3. Confidence intervals (95%) allow the comparison of diet breadths among species. The fewest number of plants species in a diet was found in Erit ...
... Diet breadths for each grasshopper species are presented in Table 1. The average number of categories in the diet is 13.7 and the average value of B is 8.3. Confidence intervals (95%) allow the comparison of diet breadths among species. The fewest number of plants species in a diet was found in Erit ...
Dasyurus maculatus - profile (PDF 630 KB)
... occurs in a small isolated population in north Queensland, while D. m. maculatus occurs along the remainder of the east coast (NPWS in prep.) from south-east Queensland to Tasmania. This subspecies previously ranged over both sides of the Great Dividing Range from Queensland to South Australia and T ...
... occurs in a small isolated population in north Queensland, while D. m. maculatus occurs along the remainder of the east coast (NPWS in prep.) from south-east Queensland to Tasmania. This subspecies previously ranged over both sides of the Great Dividing Range from Queensland to South Australia and T ...
Fact Sheet: "Can We Stop Aquatic Hitchhikers? Yes ..." (pdf)
... Can We Stop Aquatic Hitchhikers? Yes, Here’s How – A Primer on AIS Prevention and Control Methods by New York Sea Grant Launch Steward Clinton A. Whittaker, Jr. Aquatic invasive species (AIS) are nonnative species that can cause harm to the environment, economy or human health. AIS are an increasing ...
... Can We Stop Aquatic Hitchhikers? Yes, Here’s How – A Primer on AIS Prevention and Control Methods by New York Sea Grant Launch Steward Clinton A. Whittaker, Jr. Aquatic invasive species (AIS) are nonnative species that can cause harm to the environment, economy or human health. AIS are an increasing ...
JVS 2391 Cavieres
... 1997; Brooker & Callaghan 1998) have proposed that positive effects between species are more likely to be seen in disturbed or stressful environments. The reasoning was that harsh environments may restrict plants from acquiring resources, and any amelioration of these conditions will favour growth t ...
... 1997; Brooker & Callaghan 1998) have proposed that positive effects between species are more likely to be seen in disturbed or stressful environments. The reasoning was that harsh environments may restrict plants from acquiring resources, and any amelioration of these conditions will favour growth t ...
Chesson, P, and Kuang, J.J. 2008. The interaction between
... allow their extension. This new understanding suggests a classification of coexistence mechanisms as competition-based (when intraspecific competition exceeds interspecific competition), predationbased (when intraspecific density feedback through predators is stronger than interspecific density feed ...
... allow their extension. This new understanding suggests a classification of coexistence mechanisms as competition-based (when intraspecific competition exceeds interspecific competition), predationbased (when intraspecific density feedback through predators is stronger than interspecific density feed ...
Ch55Test_File - Milan Area Schools
... a. the number of species will be changed by the presence of the sea star, but the direction of change cannot be predicted. b. the variety of species will be unaffected by the presence or absence of the sea star. c. the variety of species will be greater when the sea star is present than when it is ...
... a. the number of species will be changed by the presence of the sea star, but the direction of change cannot be predicted. b. the variety of species will be unaffected by the presence or absence of the sea star. c. the variety of species will be greater when the sea star is present than when it is ...
УДК 635
... environments, uses the large variety of new plants from different geographical areas. The analysis of specific variety of these cultures from the introduced in Ukraine testifies that for the landscape integrated collections are suitable over 400 kinds and big number of their cultivars. In this relat ...
... environments, uses the large variety of new plants from different geographical areas. The analysis of specific variety of these cultures from the introduced in Ukraine testifies that for the landscape integrated collections are suitable over 400 kinds and big number of their cultivars. In this relat ...
A mechanistic verification of the competitive exclusion principle
... Our models completely satisfy to all these conditions (Figs 3-5, S1 and S2; Movies S1-S4). The known hypotheses of natural richness are based on non-compliance with one or more of these conditions3,30,31. Let us cite three of the most known formulations of the competitive exclusion principle: “n sp ...
... Our models completely satisfy to all these conditions (Figs 3-5, S1 and S2; Movies S1-S4). The known hypotheses of natural richness are based on non-compliance with one or more of these conditions3,30,31. Let us cite three of the most known formulations of the competitive exclusion principle: “n sp ...
Phloem-feeding specialists sharing a host tree: resource partitioning
... pairs o f species at three hierarchial levels: shoots within trees, leaves within shoots, and leaflets within leaves, and calculated niche breadth ( B ) for each species when alone and when co-habiting with another. Competition will be indicated i f B o f at least one species is smaller when co-habi ...
... pairs o f species at three hierarchial levels: shoots within trees, leaves within shoots, and leaflets within leaves, and calculated niche breadth ( B ) for each species when alone and when co-habiting with another. Competition will be indicated i f B o f at least one species is smaller when co-habi ...
The role of plant species size in invasibility: a
... although this correspondence was slightly reduced with the loss of some monoculture species (Fig. S1b; see below for explanation). Treatments were assigned to plots according to a stratiWed random design, so that species were evenly represented among rows and randomly placed within columns. The numb ...
... although this correspondence was slightly reduced with the loss of some monoculture species (Fig. S1b; see below for explanation). Treatments were assigned to plots according to a stratiWed random design, so that species were evenly represented among rows and randomly placed within columns. The numb ...
b10vrv2042
... An organism’s niche describes not only the environment where it lives, but how it interacts with biotic and abiotic factors in the environment. In other words, an organism’s niche includes not only the physical and biological aspects of its environment, but also the way in which the organism uses th ...
... An organism’s niche describes not only the environment where it lives, but how it interacts with biotic and abiotic factors in the environment. In other words, an organism’s niche includes not only the physical and biological aspects of its environment, but also the way in which the organism uses th ...
Niches and Community Interactions
... An organism’s niche describes not only the environment where it lives, but how it interacts with biotic and abiotic factors in the environment. In other words, an organism’s niche includes not only the physical and biological aspects of its environment, but also the way in which the organism uses th ...
... An organism’s niche describes not only the environment where it lives, but how it interacts with biotic and abiotic factors in the environment. In other words, an organism’s niche includes not only the physical and biological aspects of its environment, but also the way in which the organism uses th ...
Weak and variable relationships between environmental severity
... indicators, such as germination, growth or survival, is well known to have potentially profound effects on experimental outcomes (Goldberg et al. 1999; Maestre et al. 2005), more subtle differences among studies may also cause variability, but are often disregarded. Such differences include the supp ...
... indicators, such as germination, growth or survival, is well known to have potentially profound effects on experimental outcomes (Goldberg et al. 1999; Maestre et al. 2005), more subtle differences among studies may also cause variability, but are often disregarded. Such differences include the supp ...
Increasing deterministic control of primary succession on Mount St
... (ter Braak & Šmilauer 2007). Both samples and species were centered and standardized, and species scores were square-root-transformed. I used redundancy analysis (RDA) (ter Braak & Šmilauer 2007) to explore the relationship between species composition and the explanatory variables. RDA was used be ...
... (ter Braak & Šmilauer 2007). Both samples and species were centered and standardized, and species scores were square-root-transformed. I used redundancy analysis (RDA) (ter Braak & Šmilauer 2007) to explore the relationship between species composition and the explanatory variables. RDA was used be ...
Chapter 3 Environment: The Science behind the Stories 4th Edition
... Population characteristics • Population density = the number of individuals in a population per unit area • Large organisms usually have low densities - They need many resources and a large area to survive • High densities make it easier to find mates - But increase competition and vulnerability to ...
... Population characteristics • Population density = the number of individuals in a population per unit area • Large organisms usually have low densities - They need many resources and a large area to survive • High densities make it easier to find mates - But increase competition and vulnerability to ...
Chapter 4
... independently to its own limiting factors - Species join or leave communities without greatly altering the community’s composition - The most widely accepted view of ecologists today © 2011 Pearson Education, Inc. ...
... independently to its own limiting factors - Species join or leave communities without greatly altering the community’s composition - The most widely accepted view of ecologists today © 2011 Pearson Education, Inc. ...
Human-aided admixture may fuel ecosystem transformation during biological invasions: theoretical and
... For years, the study of invasive species has focused on testing specific hypotheses about the ecological mechanisms leading to dominance of introduced invasive species (e.g., enemy release hypothesis, novel weapons hypothesis, and the accumulation of local pathogens hypothesis) (Callaway and Ridenou ...
... For years, the study of invasive species has focused on testing specific hypotheses about the ecological mechanisms leading to dominance of introduced invasive species (e.g., enemy release hypothesis, novel weapons hypothesis, and the accumulation of local pathogens hypothesis) (Callaway and Ridenou ...
Time-of-day bias in diurnal raptor abundance and richness
... activity and thus on their detectability (see Bunn et al. 1995). However, despite the widespread use of road surveys to estimate raptor abundances, very few studies have ever addressed the impact of this bias on the accuracy of the method. As well, previous studies have found that the time of day af ...
... activity and thus on their detectability (see Bunn et al. 1995). However, despite the widespread use of road surveys to estimate raptor abundances, very few studies have ever addressed the impact of this bias on the accuracy of the method. As well, previous studies have found that the time of day af ...
Species disc. Concept
... in case no other information were available. If they had more information than morphology, they adapted their species concepts accordingly. ...
... in case no other information were available. If they had more information than morphology, they adapted their species concepts accordingly. ...
Introduced species
![](https://commons.wikimedia.org/wiki/Special:FilePath/Melilotus_alba_bgiu.jpg?width=300)
An introduced, alien, exotic, non-indigenous, or non-native species, or simply an introduction, is a species living outside its native distributional range, which has arrived there by human activity, either deliberate or accidental. Non-native species can have various effects on the local ecosystem. Introduced species that become established and spread beyond the place of introduction are called invasive species. Some have a negative effect on a local ecosystem. Some introduced species may have no negative effect or only minor impact. Some species have been introduced intentionally to combat pests. They are called biocontrols and may be regarded as beneficial as an alternative to pesticides in agriculture for example. In some instances the potential for being beneficial or detrimental in the long run remains unknown. A list of some introduced species is given in a separate article.The effects of introduced species on natural environments have gained much scrutiny from scientists, governments, farmers and others.