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... or reduced larval quality and metamorphic/postmetamorphic success. Low fecundities of clams in GSB relative to other mid-Atlantic south shore estuaries were documented by the HCRI in 2001. • Predation. Analysis of long-term predator surveys showed that the decline in hard clam abundance could not b ...
... or reduced larval quality and metamorphic/postmetamorphic success. Low fecundities of clams in GSB relative to other mid-Atlantic south shore estuaries were documented by the HCRI in 2001. • Predation. Analysis of long-term predator surveys showed that the decline in hard clam abundance could not b ...
The Return of the Wolf
... over the same food resources. Humans play a key role in ecosystem processes through fishing (Steneck, 1998) and hunting (Fryxell et al., 2010). In many ungulate populations, predation by apex predators has been the main mortality factor, often with a regulating effect (Gasaway et al., 1983; Messier, ...
... over the same food resources. Humans play a key role in ecosystem processes through fishing (Steneck, 1998) and hunting (Fryxell et al., 2010). In many ungulate populations, predation by apex predators has been the main mortality factor, often with a regulating effect (Gasaway et al., 1983; Messier, ...
Direct inhibition of leaf dark respiration by elevated CO is
... a short-term change in CO2 concentration between 360 and 700 µmol mol−1 ranged from an apparent 6.4% inhibition in P. villosum to 2.4% stimulation in Agropyron repens (Table 1). However, with the exception of P. villosum, none of the individual species responses at these CO2 concentrations were stat ...
... a short-term change in CO2 concentration between 360 and 700 µmol mol−1 ranged from an apparent 6.4% inhibition in P. villosum to 2.4% stimulation in Agropyron repens (Table 1). However, with the exception of P. villosum, none of the individual species responses at these CO2 concentrations were stat ...
aggregation
... suggesting that individuals may attract each other - but their role in creating egg aggregations is unknown their likely importance is undermined by the same arguements used against the role of quality differences in addition the candidate odours are not entirely species specific and share component ...
... suggesting that individuals may attract each other - but their role in creating egg aggregations is unknown their likely importance is undermined by the same arguements used against the role of quality differences in addition the candidate odours are not entirely species specific and share component ...
scale-dependent responses of plant biodiversity to nitrogen
... Abstract. Experimental studies demonstrating that nitrogen (N) enrichment reduces plant diversity within individual plots have led to the conclusion that anthropogenic N enrichment is a threat to global biodiversity. These conclusions overlook the influence of spatial scale, however, as N enrichment ...
... Abstract. Experimental studies demonstrating that nitrogen (N) enrichment reduces plant diversity within individual plots have led to the conclusion that anthropogenic N enrichment is a threat to global biodiversity. These conclusions overlook the influence of spatial scale, however, as N enrichment ...
Seasonal succession in fishless ponds: effects
... Daphnia populations. However, large Daphnia commonly exhibit midsummer extinctions in ponds lacking planktivorous fish. A number of empirical and theoretical studies suggest that resource competition and its interaction with nutrient enrichment may determine variable dominance by large Daphnia. Low ...
... Daphnia populations. However, large Daphnia commonly exhibit midsummer extinctions in ponds lacking planktivorous fish. A number of empirical and theoretical studies suggest that resource competition and its interaction with nutrient enrichment may determine variable dominance by large Daphnia. Low ...
Seagrass patch size affects fish responses to edges
... 1. Patch area and proximity of patch edge can influence ecological processes across patchy landscapes and may interact with each other. Different patch sizes have different amounts of core habitat, potentially affecting animal abundances at the edge and middle of patches. In this study, we tested if ...
... 1. Patch area and proximity of patch edge can influence ecological processes across patchy landscapes and may interact with each other. Different patch sizes have different amounts of core habitat, potentially affecting animal abundances at the edge and middle of patches. In this study, we tested if ...
Observations of Elk and Deer Competition and Commensalism on
... feedingcraters and stem breakage extended the zone of browse availability for deer vertically in both directions. Additionally, elk trails extended the deer browse zone horizontally to plants that might otherwise have been isolated because of snow accumulations. Potvin and Huot (1983)examined the en ...
... feedingcraters and stem breakage extended the zone of browse availability for deer vertically in both directions. Additionally, elk trails extended the deer browse zone horizontally to plants that might otherwise have been isolated because of snow accumulations. Potvin and Huot (1983)examined the en ...
predator accelerated replacement
... species were competitively equal (Wilbur 1982, Werner et al. 1983, Wilbur et al. 1983, Woodward 1983, Werner 1991). Predators thereby lower the density of inferior species, releasing the dominant species from both inter- and intra-specific competition (Wilbur et al 1983, Case 1996). For example, Eur ...
... species were competitively equal (Wilbur 1982, Werner et al. 1983, Wilbur et al. 1983, Woodward 1983, Werner 1991). Predators thereby lower the density of inferior species, releasing the dominant species from both inter- and intra-specific competition (Wilbur et al 1983, Case 1996). For example, Eur ...
Modeling the Impact of the African Elephant, Loxodonta africana, on
... the Getz Lab has always been a great place to work so thanks to all my lab colleagues past and present (especial thanks to Wes for all the encouraging phone calls as well as the guiding hand as I found my feet here). Logan was the first fellow student I met at Berkeley and has proved a great friend ...
... the Getz Lab has always been a great place to work so thanks to all my lab colleagues past and present (especial thanks to Wes for all the encouraging phone calls as well as the guiding hand as I found my feet here). Logan was the first fellow student I met at Berkeley and has proved a great friend ...
Ecology (Ch. 2-5): TEST PRACTICE Multiple Choice Identify the
... ____ 56. The biome that makes up most of the central part of the United States is a. rain forest. c. tundra. b. temperate grassland. d. deciduous forest. ____ 57. Which of the following is not an adaptation for water conservation found in desert organisms? a. nocturnal lifestyle c. waxy leaf coating ...
... ____ 56. The biome that makes up most of the central part of the United States is a. rain forest. c. tundra. b. temperate grassland. d. deciduous forest. ____ 57. Which of the following is not an adaptation for water conservation found in desert organisms? a. nocturnal lifestyle c. waxy leaf coating ...
The Mutualistic Niche
... The requirement niche can be defined by first identifying the minimum level of a limiting essential resource that is necessary for a given species to maintain a population (Figure 1c). Above this minimum resource level, also known as R∗ , per capita birth rate exceeds per capita death and the popula ...
... The requirement niche can be defined by first identifying the minimum level of a limiting essential resource that is necessary for a given species to maintain a population (Figure 1c). Above this minimum resource level, also known as R∗ , per capita birth rate exceeds per capita death and the popula ...
Issues of Elk Productivity for Research and
... populations. Questions have centered on whether factors that most affect ungulate productivity are density dependent or density independent and if predation can limit elk populations. Following Skogland (1991), we define regulation as any positive density-dependent (effects increase as density incre ...
... populations. Questions have centered on whether factors that most affect ungulate productivity are density dependent or density independent and if predation can limit elk populations. Following Skogland (1991), we define regulation as any positive density-dependent (effects increase as density incre ...
Ingredients for protist coexistence: competition, endosymbiosis and
... It comprises seven treatments that were replicated four times: the three species (P. bursaria, endosymbiont-free P. bursaria and a competitor) in monoculture; two competition treatments (P. bursaria or endosymbiont-free P. bursaria with a competitor) and two allelopathy treatments where P. bursaria ...
... It comprises seven treatments that were replicated four times: the three species (P. bursaria, endosymbiont-free P. bursaria and a competitor) in monoculture; two competition treatments (P. bursaria or endosymbiont-free P. bursaria with a competitor) and two allelopathy treatments where P. bursaria ...
Relative importance of recruitment and other causes of variation in
... (1990) notes that, at least at low densities, settlement and recruitment can be positively correlated whether or not mortality is density dependent. In this paper, I evaluate the relative importance of recruitment density and postrecruitment factors in governing the abundance of solitary sessile inv ...
... (1990) notes that, at least at low densities, settlement and recruitment can be positively correlated whether or not mortality is density dependent. In this paper, I evaluate the relative importance of recruitment density and postrecruitment factors in governing the abundance of solitary sessile inv ...
Trophic Interactions during Primary Succession
... alone is unlikely to explain the decreased lupine spread rates. However, weak dispersal ability coupled with decreased production of seeds could contribute to slower spread rates. The above mechanisms appear inadequate as explanations of the pronounced decrease in lupine population growth rates unde ...
... alone is unlikely to explain the decreased lupine spread rates. However, weak dispersal ability coupled with decreased production of seeds could contribute to slower spread rates. The above mechanisms appear inadequate as explanations of the pronounced decrease in lupine population growth rates unde ...
white rock wind farm pty limited
... The field work was undertaken in sections (please refer to Figure 1 which shows the study area and section numbers). The Little Eagle was recorded during field assessment in Section 1 of the study area. The Little Lorikeet was recorded within Section 3 and the Diamond Firetail was recorded within Se ...
... The field work was undertaken in sections (please refer to Figure 1 which shows the study area and section numbers). The Little Eagle was recorded during field assessment in Section 1 of the study area. The Little Lorikeet was recorded within Section 3 and the Diamond Firetail was recorded within Se ...
Habitat heterogeneity and mammalian predatorprey interactions
... variation in reproduction and mortality rates. Prey can respond to predator presence by avoiding areas or patches with high predator density or perceived risk (Lima & Dill 1990). This type of behavioural response may be particularly strong during certain phases of the individual’s life when its own ...
... variation in reproduction and mortality rates. Prey can respond to predator presence by avoiding areas or patches with high predator density or perceived risk (Lima & Dill 1990). This type of behavioural response may be particularly strong during certain phases of the individual’s life when its own ...
UNIT 2 Practice TEST
... c. Amphibians are experiencing sharp population declines in a variety of habitats. d. Amphibians eat many insects, second in number only to birds. e. They are often considered keystone species. Birds and trout make good a. nonnative species. b. native species. c. keystone species. d. indicator speci ...
... c. Amphibians are experiencing sharp population declines in a variety of habitats. d. Amphibians eat many insects, second in number only to birds. e. They are often considered keystone species. Birds and trout make good a. nonnative species. b. native species. c. keystone species. d. indicator speci ...
ppt
... diversity provided by terrestrial plants… on the whole the problem still remains, but in the new form: Why are there so many kinds of plants?” Hutchinson (1959) “Homage to Santa Rosalia” ...
... diversity provided by terrestrial plants… on the whole the problem still remains, but in the new form: Why are there so many kinds of plants?” Hutchinson (1959) “Homage to Santa Rosalia” ...
