Effects of density and ontogeny on size and growth
... across space or over time affect successional trajectories in forests and are theoretically important for maintaining species coexistence (Grime 1979; Tilman 1982; Chesson 1985), yet we do not fully understand the complex controls over community dynamics in mixed-species stands because long-term exp ...
... across space or over time affect successional trajectories in forests and are theoretically important for maintaining species coexistence (Grime 1979; Tilman 1982; Chesson 1985), yet we do not fully understand the complex controls over community dynamics in mixed-species stands because long-term exp ...
AP Biology Reading Guide Chapter 50 An Introduction To
... 18. According to the energetic hypothesis, why are food chains limited in length? How much energy is typically transferred to each higher level? 19. What is a dominant species? For the area where you live, what would be considered a dominant tree species? 20. How is a keystone species different from ...
... 18. According to the energetic hypothesis, why are food chains limited in length? How much energy is typically transferred to each higher level? 19. What is a dominant species? For the area where you live, what would be considered a dominant tree species? 20. How is a keystone species different from ...
A Field Atlas of the Seashore
... compare the two photos, right, to see where they might fit on the scale. Both were taken a mid-tide level but still it is possible to judge their position on the scale. The one to the right is around BES 7 and the left one is BES 3. ...
... compare the two photos, right, to see where they might fit on the scale. Both were taken a mid-tide level but still it is possible to judge their position on the scale. The one to the right is around BES 7 and the left one is BES 3. ...
REPTILE RAP NL 8 Dec 2007 final
... inframarginal or inguinal regions, when turtles are disturbed. It is hypothesized that these secretions repel predators because of their offensive smell (e.g. Ehrenfeld & Ehrenfeld, 1973). Moll et al. (1986) described two forms of defensive behaviour in the Cochin forest cane turtle. In the first fo ...
... inframarginal or inguinal regions, when turtles are disturbed. It is hypothesized that these secretions repel predators because of their offensive smell (e.g. Ehrenfeld & Ehrenfeld, 1973). Moll et al. (1986) described two forms of defensive behaviour in the Cochin forest cane turtle. In the first fo ...
a full - British Ecological Society
... We intend to address the saturation question here by arguing that Type I assemblages are ubiquitous and that even Type II assemblages may not show hard limits to diversity over evolutionary time-scales. First, we review various community theories concerned with the maintenance of local richness in e ...
... We intend to address the saturation question here by arguing that Type I assemblages are ubiquitous and that even Type II assemblages may not show hard limits to diversity over evolutionary time-scales. First, we review various community theories concerned with the maintenance of local richness in e ...
Dispersal Rates Affect Species Composition in Metacommunities of
... smithii was present, which may have resulted from the direct affect of predation on extinction rates or the success of invasion (Shurin 2001; Miller et al. 2002). The model predicts that very high rates of dispersal should lead to reduced local diversity as some species begin to dominate across all ...
... smithii was present, which may have resulted from the direct affect of predation on extinction rates or the success of invasion (Shurin 2001; Miller et al. 2002). The model predicts that very high rates of dispersal should lead to reduced local diversity as some species begin to dominate across all ...
A distance-based framework for measuring functional diversity from
... spread) of the S species in the T-dimensional space. In univariate statistics, dispersion can be estimated by measures such as the mean absolute deviation, the sum of squared deviations from the mean (SS), the variance, the standard deviation, or the range, among others. Villéger et al. (2008) prop ...
... spread) of the S species in the T-dimensional space. In univariate statistics, dispersion can be estimated by measures such as the mean absolute deviation, the sum of squared deviations from the mean (SS), the variance, the standard deviation, or the range, among others. Villéger et al. (2008) prop ...
Species interactions, local and regional processes, and limits to the
... We intend to address the saturation question here by arguing that Type I assemblages are ubiquitous and that even Type II assemblages may not show hard limits to diversity over evolutionary time-scales. First, we review various community theories concerned with the maintenance of local richness in e ...
... We intend to address the saturation question here by arguing that Type I assemblages are ubiquitous and that even Type II assemblages may not show hard limits to diversity over evolutionary time-scales. First, we review various community theories concerned with the maintenance of local richness in e ...
Translocation strategies for multiple species depend on interspecific
... Although ignored in translocation guidelines, multispecies translocations already occur frequently. Predator-free areas are scarce and expensive to create (Bode and Wintle 2010), and the increasing number of threatened species encourages managers to move competing species into the same reserves. In ...
... Although ignored in translocation guidelines, multispecies translocations already occur frequently. Predator-free areas are scarce and expensive to create (Bode and Wintle 2010), and the increasing number of threatened species encourages managers to move competing species into the same reserves. In ...
FULL ACCOUNT FOR: Python bivittatus Global Invasive Species
... The international pet trade has turned the Burmese python into a valuable merchandise, various morphs in different colors and patterns have been developed which are assigned high prices. More than 144,000 Burmese pythons have been imported into the United States for exotic pet trade from 2000-2005 ( ...
... The international pet trade has turned the Burmese python into a valuable merchandise, various morphs in different colors and patterns have been developed which are assigned high prices. More than 144,000 Burmese pythons have been imported into the United States for exotic pet trade from 2000-2005 ( ...
MECHANISMS OF MAINTENANCE OF SPECIES DIVERSITY Peter
... ki − ks would not be zero, and if sufficiently large, this fitness difference would counteract the stabilizing effect of low resource overlap, causing competitive exclusion. This result would occur because the advantaged species would be at such high density that it would consume too much of the res ...
... ki − ks would not be zero, and if sufficiently large, this fitness difference would counteract the stabilizing effect of low resource overlap, causing competitive exclusion. This result would occur because the advantaged species would be at such high density that it would consume too much of the res ...
cheatgrass Bromus tectorum L.
... Description Cheatgrass is an annual or winter annual grass that grows 13 to 58 cm tall. Stems are smooth, slender, and erect. They protrude from a much branched base. Leaf blades are flat, 5 to 15 inches long, and soft-hairy. As the plants and seeds reach maturity, the leaves turn purplish-tan. Pani ...
... Description Cheatgrass is an annual or winter annual grass that grows 13 to 58 cm tall. Stems are smooth, slender, and erect. They protrude from a much branched base. Leaf blades are flat, 5 to 15 inches long, and soft-hairy. As the plants and seeds reach maturity, the leaves turn purplish-tan. Pani ...
Seasonal species interactions minimize the impact of species
... has reached up to 96 cm and covered the ground from November until April. The temperature in January, the coldest month, averages −4.8°C. June, July, and August are the warmest months with mean daily temperatures of 17°C, and the highest insolation, on average 7 h/d compared to 48 min/d in December ...
... has reached up to 96 cm and covered the ground from November until April. The temperature in January, the coldest month, averages −4.8°C. June, July, and August are the warmest months with mean daily temperatures of 17°C, and the highest insolation, on average 7 h/d compared to 48 min/d in December ...
An Ecological Assessment of
... pasture in DL341. Canopy cover (by layer) was determined using a standard Daubenmire frame (20x50 cm). One line was set-up 5 m from the fence in the pasture (hay/grazed area) area and the other was set-up 5 m outside the fence on the ungrazed side. Both lines started at the east end of the pasture a ...
... pasture in DL341. Canopy cover (by layer) was determined using a standard Daubenmire frame (20x50 cm). One line was set-up 5 m from the fence in the pasture (hay/grazed area) area and the other was set-up 5 m outside the fence on the ungrazed side. Both lines started at the east end of the pasture a ...
Invasiveness, invasibility and the role of environmental
... Invasion ecology, the study of how organisms spread in habitats to which they are not native, asks both about the invasiveness of species and the invasibility of habitats: Which species are most likely to become invasive? Which habitats are most susceptible to invasion? To set the stage for consider ...
... Invasion ecology, the study of how organisms spread in habitats to which they are not native, asks both about the invasiveness of species and the invasibility of habitats: Which species are most likely to become invasive? Which habitats are most susceptible to invasion? To set the stage for consider ...
Hydrological niches in terrestrial plant communities: A review
... gas-exchange rate, its photosynthetic rate and thus its relative growth rate (RGR) ...
... gas-exchange rate, its photosynthetic rate and thus its relative growth rate (RGR) ...
Ecology - Zanichelli online
... conditions it requires to survive, grow, and reproduce. A niche is therefore partly defined by the resources available in the environment. ...
... conditions it requires to survive, grow, and reproduce. A niche is therefore partly defined by the resources available in the environment. ...
ppt
... What about character displacement? “Under certain circumstances, where new niches are encountered (e.g., on islands) or where competition with an ecologically similar species is strong and predictable, particular ecological traits of an organism may change adaptively over time… leading to a breakdow ...
... What about character displacement? “Under certain circumstances, where new niches are encountered (e.g., on islands) or where competition with an ecologically similar species is strong and predictable, particular ecological traits of an organism may change adaptively over time… leading to a breakdow ...
Global Biodiversity Change Indicators
... typically constrained in their adequate geographic representation, the level of disaggregation they allow, their temporal resolution, and their scientific underpinning and transparency. The Species Habitat Indices are part of a new generation of indicators that address these limitations by utilizing ...
... typically constrained in their adequate geographic representation, the level of disaggregation they allow, their temporal resolution, and their scientific underpinning and transparency. The Species Habitat Indices are part of a new generation of indicators that address these limitations by utilizing ...
Biodiversity, productivity and the temporal stability of
... productivity exceeds the expected value based on productivity in monocultures, because this increases the mean relative to the variance of productivity (Lehman & Tilman 2000). Species asynchrony effects increase temporal stability when species fluctuations are not perfectly synchronized, because thi ...
... productivity exceeds the expected value based on productivity in monocultures, because this increases the mean relative to the variance of productivity (Lehman & Tilman 2000). Species asynchrony effects increase temporal stability when species fluctuations are not perfectly synchronized, because thi ...
Pollination Biology
... welfare today. Most human food comes from cereal grains (Poaceae) and legumes (Fabaceae) all of which result from pollination. Nearly all edible fruits would not exist without pollination. ...
... welfare today. Most human food comes from cereal grains (Poaceae) and legumes (Fabaceae) all of which result from pollination. Nearly all edible fruits would not exist without pollination. ...
Bifrenaria
Bifrenaria, abbreviated Bif. in horticultural trade, is a genus of plant in family Orchidaceae. It contains 20 species found in Panama, Trinidad and South America. There are no known uses for them, but their abundant, and at first glance artificial, flowers, make them favorites of orchid growers.The genus can be split in two clearly distinct groups: one of highly robust plants with large flowers, that encompass the first species to be classified under the genus Bifrenaria; other of more delicate plants with smaller flowers occasionally classified as Stenocoryne or Adipe. There are two additional species that are normally classified as Bifrenaria, but which molecular analysis indicate to belong to different orchid groups entirely. One is Bifrenaria grandis which is endemic to Bolívia and which is now placed in Lacaena, and Bifrenaria steyermarkii, an inhabitant of the northern Amazon Forest, which does not have an alternative classification.