Ch 21 ppt
... r-selected organisms produce a lot of offspring and invest little in each offspring. For example, they provide little parental care. Few of the offspring reach adulthood. K-selected organisms produce a few offspring and provide a great deal of investment in each. For example, they provide a lot of p ...
... r-selected organisms produce a lot of offspring and invest little in each offspring. For example, they provide little parental care. Few of the offspring reach adulthood. K-selected organisms produce a few offspring and provide a great deal of investment in each. For example, they provide a lot of p ...
Quantifying predator dependence in the functional
... How predator feeding rates respond to changes in prey abundance underlies the dynamics of all predator-prey interactions (Murdoch & Oaten, 1975). A longstanding and still vigorous debate in the predator-prey literature concerns whether these functional responses are best described by prey-dependent ...
... How predator feeding rates respond to changes in prey abundance underlies the dynamics of all predator-prey interactions (Murdoch & Oaten, 1975). A longstanding and still vigorous debate in the predator-prey literature concerns whether these functional responses are best described by prey-dependent ...
Physical factors affecting the relative abundance
... upstream sites and G. fasciatus becomes proportionally more abundant at sites lower in the system, then this suggests that E. ischnus is replacing G. fasciatus as it spreads downstream. Alternatively, E. ischnus might spread via jump dispersal and subsequent radial population growth from multiple-is ...
... upstream sites and G. fasciatus becomes proportionally more abundant at sites lower in the system, then this suggests that E. ischnus is replacing G. fasciatus as it spreads downstream. Alternatively, E. ischnus might spread via jump dispersal and subsequent radial population growth from multiple-is ...
Evolution in Population Parameters: Density
... merely theoretical curiosities. Yoshida et al. (2003) demonstrated that when experimental populations of a green alga were allowed to evolve in response to grazing by a rotifer, all of the parameters that specified the population dynamics of the rotifer and the alga (damping of oscillations, amplitu ...
... merely theoretical curiosities. Yoshida et al. (2003) demonstrated that when experimental populations of a green alga were allowed to evolve in response to grazing by a rotifer, all of the parameters that specified the population dynamics of the rotifer and the alga (damping of oscillations, amplitu ...
Bacterial colonization and extinction on marine aggregates
... depends on aggregate size and background bacterial density. This deterministic model has been found to describe well the abundance and dynamics of the entire community on the aggregate in terms of density-dependent growth rates, detachment and permanent attachment, and predation from higher trophic ...
... depends on aggregate size and background bacterial density. This deterministic model has been found to describe well the abundance and dynamics of the entire community on the aggregate in terms of density-dependent growth rates, detachment and permanent attachment, and predation from higher trophic ...
Seed germination traits of two plant functional
... species; and Chinnusamy et al. (2005) have reviewed the molecular basis of salt tolerance in plants. However, most previous studies have focused on the responses of plants to salinity within species (e.g., Houle et al. 2001; Megdiche et al. 2007; Rumbaugh et al. 1993). A few studies have been conduc ...
... species; and Chinnusamy et al. (2005) have reviewed the molecular basis of salt tolerance in plants. However, most previous studies have focused on the responses of plants to salinity within species (e.g., Houle et al. 2001; Megdiche et al. 2007; Rumbaugh et al. 1993). A few studies have been conduc ...
A Stoichiometric Model of Early Plant Primary Succession
... cat’s ear (Hypochaeris radicata; a weedy, nonnative composite), Lupinus decreased in biomass, and overall community biomass increased (Gill et al. 2006; Bishop et al. 2010). With additional P, Lupinus biomass increased over the short term, but other plant species experienced longterm benefit from N ...
... cat’s ear (Hypochaeris radicata; a weedy, nonnative composite), Lupinus decreased in biomass, and overall community biomass increased (Gill et al. 2006; Bishop et al. 2010). With additional P, Lupinus biomass increased over the short term, but other plant species experienced longterm benefit from N ...
Growth, development, and life-history strategies in an unpredictable
... increased substrate surface area to water volume (which may promote microbe density). We further predict that intra-specific competition will constrain larval growth under limited resource conditions. Finally, we expect larvae in sub-optimal conditions to have longer development times, but emerge at ...
... increased substrate surface area to water volume (which may promote microbe density). We further predict that intra-specific competition will constrain larval growth under limited resource conditions. Finally, we expect larvae in sub-optimal conditions to have longer development times, but emerge at ...
Ecological processes regulating geographic distributions of
... distributions or narrow zones of sympatry (Bull 1991; Price and Kirkpatrick 2009). The influences of predator-prey, herbivore-primary producer, and facultative mutualism can also limit the ability of a species to expand its distribution. In another instance, hybridization between closely related spe ...
... distributions or narrow zones of sympatry (Bull 1991; Price and Kirkpatrick 2009). The influences of predator-prey, herbivore-primary producer, and facultative mutualism can also limit the ability of a species to expand its distribution. In another instance, hybridization between closely related spe ...
Clarifying competition - University of York File Library
... Specifically, he argued that ‘competition at times may be quite intense, but nonetheless be relatively unimportant if individual fitness or community attributes are determined largely by other factors. Because there may be variation in the degree to which individuals in a population experience compe ...
... Specifically, he argued that ‘competition at times may be quite intense, but nonetheless be relatively unimportant if individual fitness or community attributes are determined largely by other factors. Because there may be variation in the degree to which individuals in a population experience compe ...
Habitat isolation and ecological barriers
... Am ong the huge num ber o f different effects o f habitat fragmentation which are discussed in the literature, at least two groups can be distinguished, i.e. changes in the physical environment, and biogeographic changes (Saunders et al. 1991). C onsidering effects o f fragmentation on different lev ...
... Am ong the huge num ber o f different effects o f habitat fragmentation which are discussed in the literature, at least two groups can be distinguished, i.e. changes in the physical environment, and biogeographic changes (Saunders et al. 1991). C onsidering effects o f fragmentation on different lev ...
Bioeconomics and biodiversity in harvested metacommunities: a
... diversity and profit for multispecies systems. The model keeps track of the presence or absence of species in habitat patches. With this approach, it becomes (relatively) simple to include more species than can typically be included in models that track species population density. We use this patch- ...
... diversity and profit for multispecies systems. The model keeps track of the presence or absence of species in habitat patches. With this approach, it becomes (relatively) simple to include more species than can typically be included in models that track species population density. We use this patch- ...
Role of Biotic Interactions in a Small Mammal Assemblage in
... al. 1979, 1981, Jaksic 1986, Simonetti 1989a, b). Chilean small mammals have about the same dietary overlap as do those in mediterranean California (Meserve 1981a) but have more clearly defined trophic niches (Meserve 198 1b). In the central Chilean mediterranean zone as well as northern semiarid fr ...
... al. 1979, 1981, Jaksic 1986, Simonetti 1989a, b). Chilean small mammals have about the same dietary overlap as do those in mediterranean California (Meserve 1981a) but have more clearly defined trophic niches (Meserve 198 1b). In the central Chilean mediterranean zone as well as northern semiarid fr ...
A Stoichiometric Model of Early Plant Primary Succession
... cat’s ear (Hypochaeris radicata; a weedy, nonnative composite), Lupinus decreased in biomass, and overall community biomass increased (Gill et al. 2006; Bishop et al. 2010). With additional P, Lupinus biomass increased over the short term, but other plant species experienced longterm benefit from N ...
... cat’s ear (Hypochaeris radicata; a weedy, nonnative composite), Lupinus decreased in biomass, and overall community biomass increased (Gill et al. 2006; Bishop et al. 2010). With additional P, Lupinus biomass increased over the short term, but other plant species experienced longterm benefit from N ...
Trait-mediated assembly processes predict successional changes in
... space and time (3). However, the simultaneous effects of different assembly mechanisms on community dynamics have not been wellcharacterized, particularly in diverse communities such as tropical forests. High dynamism of vegetation composition during tropical forest succession creates an ideal oppor ...
... space and time (3). However, the simultaneous effects of different assembly mechanisms on community dynamics have not been wellcharacterized, particularly in diverse communities such as tropical forests. High dynamism of vegetation composition during tropical forest succession creates an ideal oppor ...
Invasion Ecology of Acer platanoides in an Old
... diameter in control, intraspecific, and interspecific competition arrangements. Height growth and photosynthetic rate both decreased significantly with increased shade. Q. rubra had the highest overall photosynthesis rate (mean = 1.98 ± 0.10 µmol CO2 m-2 s-1) and A. saccharum had the greatest change ...
... diameter in control, intraspecific, and interspecific competition arrangements. Height growth and photosynthetic rate both decreased significantly with increased shade. Q. rubra had the highest overall photosynthesis rate (mean = 1.98 ± 0.10 µmol CO2 m-2 s-1) and A. saccharum had the greatest change ...
PDF
... example, is likely to be more costly than giant clam culture. Prawn farmers have to manage the quality of the water and give intensive feeding to achieve higher yield. The types of prawn farming that depend solely on natural food will yield a lower production per unit area (Ling 1973, p. 17; Maguir ...
... example, is likely to be more costly than giant clam culture. Prawn farmers have to manage the quality of the water and give intensive feeding to achieve higher yield. The types of prawn farming that depend solely on natural food will yield a lower production per unit area (Ling 1973, p. 17; Maguir ...
Full Text - Digital Access to Scholarship at Harvard
... richness, or alpha diversity, which describes the number of species that live in a community. There are many factors that influence species richness [2]. For example, island biogeography theory suggests that, all else equal, communities that encompass a large area are also more likely to receive imm ...
... richness, or alpha diversity, which describes the number of species that live in a community. There are many factors that influence species richness [2]. For example, island biogeography theory suggests that, all else equal, communities that encompass a large area are also more likely to receive imm ...
PDF
... regression method is applied to the relationship between latitude and the difference between the Last Glacial Maximum (LGM) and the present temperature but not when present energy-water factors are analysed. When this threshold effect of historic climatic change is partialled out, current energy-wat ...
... regression method is applied to the relationship between latitude and the difference between the Last Glacial Maximum (LGM) and the present temperature but not when present energy-water factors are analysed. When this threshold effect of historic climatic change is partialled out, current energy-wat ...
INTERMEDIATE DISTURBANCE AND ITS RELATIONSHIP TO
... competing model, gradual climate change (Connell, 1978) in lake ecosystems (Padisák, 1994; Wilson, 1994; Reynolds, 1995). In the gradual climate change model, changes in environmental conditions such as those due to seasonality prevent any species from achieving dominance in a community. As conditio ...
... competing model, gradual climate change (Connell, 1978) in lake ecosystems (Padisák, 1994; Wilson, 1994; Reynolds, 1995). In the gradual climate change model, changes in environmental conditions such as those due to seasonality prevent any species from achieving dominance in a community. As conditio ...