Biological invasions: are they dependent on disturbance?
... natural range expansion, though circumvention of geographic distribution 'filters' by humans can effect tremendous expansion of species' realized ranges. For example, in only 1 decade the zebra mussel has achieved widespread distribution in lakes and rivers throughout eastern North America after be ...
... natural range expansion, though circumvention of geographic distribution 'filters' by humans can effect tremendous expansion of species' realized ranges. For example, in only 1 decade the zebra mussel has achieved widespread distribution in lakes and rivers throughout eastern North America after be ...
F2009B00248 F2009B00248 - Federal Register of Legislation
... Criteria (c). The extent to which the habitat is used by important populations. NB: An important population is one that is necessary for a species’ long-term survival and recovery. This may include populations that are: key source populations either for breeding or dispersal, populations that are ne ...
... Criteria (c). The extent to which the habitat is used by important populations. NB: An important population is one that is necessary for a species’ long-term survival and recovery. This may include populations that are: key source populations either for breeding or dispersal, populations that are ne ...
Aboveground Invertebrate Responses to Land Management
... Kemp et al. 1990, Oliver and Beattie 1993, New 1997). For example, Murphy and Wilcox (1986) found that butterßy diversity on habitat “islands” in the Great Basin Desert was more sensitive to local fragmentation than bird diversity, even though the regional diversity patterns of both groups were corr ...
... Kemp et al. 1990, Oliver and Beattie 1993, New 1997). For example, Murphy and Wilcox (1986) found that butterßy diversity on habitat “islands” in the Great Basin Desert was more sensitive to local fragmentation than bird diversity, even though the regional diversity patterns of both groups were corr ...
Fifty years of change in northern upland forest understories: Identity
... test the null hypothesis that the proportion of quadrats occupied by each species did not change over time. Using sites as replicates, we calculated Gtotal, Gpooled, and Gheterogeniety teststatistics for each understory species to determine if shifts in quadrat frequency over time are significant ac ...
... test the null hypothesis that the proportion of quadrats occupied by each species did not change over time. Using sites as replicates, we calculated Gtotal, Gpooled, and Gheterogeniety teststatistics for each understory species to determine if shifts in quadrat frequency over time are significant ac ...
Opportunistic exploitation - School of Environmental and Forest
... could make a living by targeting elephants, which were ten times more abundant, while poaching black rhinoceroses when they were encountered [20]. By the end of the 20th century, black rhinoceroses were extinct not just in the Luangwa Valley, but in all of Zambia [21]. Similarly, hunters in the Indo ...
... could make a living by targeting elephants, which were ten times more abundant, while poaching black rhinoceroses when they were encountered [20]. By the end of the 20th century, black rhinoceroses were extinct not just in the Luangwa Valley, but in all of Zambia [21]. Similarly, hunters in the Indo ...
On the evolutionary ecology of species` ranges - People
... genetic variation in dispersal rates, individuals with higher dispersal rates will tend to be found in increasing frequency near the range limits (simply because they move more), hence the rate of range expansion will tend to increase over time. Many introductions have an initial lag, during which i ...
... genetic variation in dispersal rates, individuals with higher dispersal rates will tend to be found in increasing frequency near the range limits (simply because they move more), hence the rate of range expansion will tend to increase over time. Many introductions have an initial lag, during which i ...
Threatened Species Conservation Regulation 2010
... undergo within a time span appropriate to the life cycle and habitat characteristics of its component species: (a) for critically endangered ecological communities—a very large reduction in ecological function, or (b) for endangered ecological communities—a large reduction in ecological function, or ...
... undergo within a time span appropriate to the life cycle and habitat characteristics of its component species: (a) for critically endangered ecological communities—a very large reduction in ecological function, or (b) for endangered ecological communities—a large reduction in ecological function, or ...
habitat and landscape characteristics underlying anuran
... examine patterns in anuran community structure and identify the most important variables associated with those patterns. Urban density at the landscape scale had a significant negative influence on overall anuran abundance and diversity. While every species exhibited a decrease in abundance with incre ...
... examine patterns in anuran community structure and identify the most important variables associated with those patterns. Urban density at the landscape scale had a significant negative influence on overall anuran abundance and diversity. While every species exhibited a decrease in abundance with incre ...
Predicting ecosystem stability from community
... at all levels of species diversity (Fig. 1, left panels). At high levels of connectance and interspecific competition, the match was still present but was less strong (Fig. 1, right panels). Recall that our prediction includes the effect of interspecific competition on average species abundances, bu ...
... at all levels of species diversity (Fig. 1, left panels). At high levels of connectance and interspecific competition, the match was still present but was less strong (Fig. 1, right panels). Recall that our prediction includes the effect of interspecific competition on average species abundances, bu ...
13.1 Ecologists Study Relationships
... Ecological research methods include observation, experimentation, and modeling. • Observation is the act of carefully watching something ...
... Ecological research methods include observation, experimentation, and modeling. • Observation is the act of carefully watching something ...
Practice Exam 4
... 3) When two different populations in a community benefit from their relationship with each other, the result is called a. predation. b. partnership. c. mutualism. d. herbivory. e. competition. 4) The sum total of a population's use of the biotic and abiotic resources of its habitat constitutes its a ...
... 3) When two different populations in a community benefit from their relationship with each other, the result is called a. predation. b. partnership. c. mutualism. d. herbivory. e. competition. 4) The sum total of a population's use of the biotic and abiotic resources of its habitat constitutes its a ...
Natural Selection - Ms Williams
... • 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 predation - Increased transmission of diseases • Low densities make it harder to find mates - But individu ...
... • 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 predation - Increased transmission of diseases • Low densities make it harder to find mates - But individu ...
Study Guide - KSU Web Home
... • 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 predation - Increased transmission of diseases • Low densities make it harder to find mates - But individu ...
... • 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 predation - Increased transmission of diseases • Low densities make it harder to find mates - But individu ...
Chapter 3 - Santa Rosa County School District
... • 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 predation - Increased transmission of diseases • Low densities make it harder to find mates - But individu ...
... • 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 predation - Increased transmission of diseases • Low densities make it harder to find mates - But individu ...
Amphibian Monitoring
... amphibian populations may be due in part to natural fluctuations, but more likely suggest that humans are impacting the environment at a greater rate than amphibian species can sustain. Their complex life cycle and permeable skin make amphibians particularly sensitive to environmental disturbances s ...
... amphibian populations may be due in part to natural fluctuations, but more likely suggest that humans are impacting the environment at a greater rate than amphibian species can sustain. Their complex life cycle and permeable skin make amphibians particularly sensitive to environmental disturbances s ...
An empirical evaluation of the African elephant as a focal species for
... 2008), the focal species concept is now a staple of landscape planning for wildlife management and conservation because it allows action with incomplete knowledge. Increasingly, the approach is used not only to design protected areas (e.g. Noss et al., 1999) but also to plan wildlife linkages (i.e. ...
... 2008), the focal species concept is now a staple of landscape planning for wildlife management and conservation because it allows action with incomplete knowledge. Increasingly, the approach is used not only to design protected areas (e.g. Noss et al., 1999) but also to plan wildlife linkages (i.e. ...
Microbial interactions: from networks to models
... ecological webs can have a positive impact (that is, a win), a negative impact (that is, a loss) or no impact on the species involved. The possible combinations of win, loss and neutral outcomes for two interaction partners allow the classification of various interaction types1 (FIG. 1). For instanc ...
... ecological webs can have a positive impact (that is, a win), a negative impact (that is, a loss) or no impact on the species involved. The possible combinations of win, loss and neutral outcomes for two interaction partners allow the classification of various interaction types1 (FIG. 1). For instanc ...
Interactions between granivorous and omnivorous ants in a desert
... 1.8 ants/plot on bait/colony on Removal and Control plots while granivores averaged 9.8 and 7.0 ants/plot on bait/colony. Following the initiation of the experiment, the number of granivore colonies decreased on Removal plots by about 40% (20 vs. 33.9 colonies/616 m2) as did granivore worker activit ...
... 1.8 ants/plot on bait/colony on Removal and Control plots while granivores averaged 9.8 and 7.0 ants/plot on bait/colony. Following the initiation of the experiment, the number of granivore colonies decreased on Removal plots by about 40% (20 vs. 33.9 colonies/616 m2) as did granivore worker activit ...
Germination and establishment of invasive and native Impatiens
... a species at a site thus crucially depends on regular seed production, which may be endangered at sites where I. noli-tangere prevails because they are too shaded and wet. Despite their generally good performance in new habitats, invasive plants may suffer from occasional but catastrophic events (Go ...
... a species at a site thus crucially depends on regular seed production, which may be endangered at sites where I. noli-tangere prevails because they are too shaded and wet. Despite their generally good performance in new habitats, invasive plants may suffer from occasional but catastrophic events (Go ...
Spatial distribution patterns of the dominant canopy dipterocarp
... Population structure and spatial patterns were examined for four species of canopy dipterocarps (Anisoptera costata, Dipterocarpus alatus, Hopea odorata, Vatica cinerea) in a 50 ha plot in seasonal dry evergreen forest at the Huai Kha Khaeng Wildlife Sanctuary in western Thailand. Spatial dispersion ...
... Population structure and spatial patterns were examined for four species of canopy dipterocarps (Anisoptera costata, Dipterocarpus alatus, Hopea odorata, Vatica cinerea) in a 50 ha plot in seasonal dry evergreen forest at the Huai Kha Khaeng Wildlife Sanctuary in western Thailand. Spatial dispersion ...
the usefulness of ecological niche concepts in understanding plant
... been done in order to prove the concept of ecological niche. The results of those studies do suggest that plants segregate along various environmental niche axes. However, this concept has been challenged by the neutral theory (see Bell (2000; 2001) and Hubbell (2001) for more discussion on the theo ...
... been done in order to prove the concept of ecological niche. The results of those studies do suggest that plants segregate along various environmental niche axes. However, this concept has been challenged by the neutral theory (see Bell (2000; 2001) and Hubbell (2001) for more discussion on the theo ...
File - International Census of Marine Microbes
... problematic. Bill outlined recent studies on soil fungi and salt marsh bacteria in which the taxa-area relationships were used to extrapolate from local to regional scales. The slopes of these relationships were low, indicating that taxonomic richness is not greatly dissimilar at different scales, s ...
... problematic. Bill outlined recent studies on soil fungi and salt marsh bacteria in which the taxa-area relationships were used to extrapolate from local to regional scales. The slopes of these relationships were low, indicating that taxonomic richness is not greatly dissimilar at different scales, s ...
Community Patterns in Source
... studies have provided strong evidence that the regional dimension of species interactions could promote the local coexistence of competing species through a transfer of the effects of regional habitat heterogeneity to the local scale (Levin 1974; Amarasekare and Nisbet 2001; Mouquet and Loreau 2002) ...
... studies have provided strong evidence that the regional dimension of species interactions could promote the local coexistence of competing species through a transfer of the effects of regional habitat heterogeneity to the local scale (Levin 1974; Amarasekare and Nisbet 2001; Mouquet and Loreau 2002) ...
Marine Seaweed Invasions – Fucus Sofia A. Wikström
... species’ range to an area where it has previously not been found. The definition includes range expansion following climatic change as well as longdistance dispersal, natural or human-mediated, but excludes species arrival during succession (at least secondary succession). I use the terms introduced ...
... species’ range to an area where it has previously not been found. The definition includes range expansion following climatic change as well as longdistance dispersal, natural or human-mediated, but excludes species arrival during succession (at least secondary succession). I use the terms introduced ...