Freshwater Snails
... • Mystery snails: They are unusual among snails because they are not hermaphroditic—there are separate male and female sexes. They undergo sexual reproduction, which peaks in the spring. The females lay large clumps of pinkish eggs (usually about 200–600 eggs) above the water. This allows the eggs t ...
... • Mystery snails: They are unusual among snails because they are not hermaphroditic—there are separate male and female sexes. They undergo sexual reproduction, which peaks in the spring. The females lay large clumps of pinkish eggs (usually about 200–600 eggs) above the water. This allows the eggs t ...
organic matter flow in stream food webs with reduced detrital
... examined change in food web structure relative to a reference stream. The role of productivity in structuring food webs has been well studied, both theoretically (Oksanen et al. 1981, Sterner et al. 1997) and empirically (Hairston and Hairston 1993, Rosemond et al. 1993, Wootton and Power 1993). Cha ...
... examined change in food web structure relative to a reference stream. The role of productivity in structuring food webs has been well studied, both theoretically (Oksanen et al. 1981, Sterner et al. 1997) and empirically (Hairston and Hairston 1993, Rosemond et al. 1993, Wootton and Power 1993). Cha ...
Ecological role of large benthic decapods in marine ecosystems: a
... Chionoecetes opilio, have become particularly important commercial species in the Northwest (NW) Atlantic region and elsewhere. Decapod crustaceans have a global distribution and can be found in most habitats, ranging from intertidal to deep water regions. Their importance to humans is well document ...
... Chionoecetes opilio, have become particularly important commercial species in the Northwest (NW) Atlantic region and elsewhere. Decapod crustaceans have a global distribution and can be found in most habitats, ranging from intertidal to deep water regions. Their importance to humans is well document ...
preliminary survey of the relationship between the feeding habit and
... that C. finmarchicus ate the same amount of T. fluviatilis whether 01’ not Artemia were present. When only Artemia were available, a few were eaten, but the feeding decreased greatly in a mixed culture. Thus, it would appear that Calanus is predominantly an herbivore. Acartia tonsa Despite its small ...
... that C. finmarchicus ate the same amount of T. fluviatilis whether 01’ not Artemia were present. When only Artemia were available, a few were eaten, but the feeding decreased greatly in a mixed culture. Thus, it would appear that Calanus is predominantly an herbivore. Acartia tonsa Despite its small ...
Studies on the ecology and behaviour of the ghost crab
... predation. No deposit feeding was observed and no sand pellets (indicative of this feeding mode) were seen at any of the study sites. During one night, a group of five crabs was seen feeding on a beached fish. A similar number of crabs was also observed feeding on a gull carcass. On one occasion, at ...
... predation. No deposit feeding was observed and no sand pellets (indicative of this feeding mode) were seen at any of the study sites. During one night, a group of five crabs was seen feeding on a beached fish. A similar number of crabs was also observed feeding on a gull carcass. On one occasion, at ...
assessment of the milfoil weevil
... While the MDNRE AVAS protocol considers sampling vegetation using visual observations in areas around the littoral zone, the Point-Intercept Grid Survey method (Appendix A) is meant to assess vegetation throughout the entire surface area of a lake (Madsen et al. 1994; 1996). This method involves con ...
... While the MDNRE AVAS protocol considers sampling vegetation using visual observations in areas around the littoral zone, the Point-Intercept Grid Survey method (Appendix A) is meant to assess vegetation throughout the entire surface area of a lake (Madsen et al. 1994; 1996). This method involves con ...
Construction and validation of food webs using logic
... so-called sampling effect can arise due to an increased probability of including one species with atypically high productivity or efficient resource use, as the total species pool broadens (Fargione et al., 2007). The portfolio effect (Tilman et al., 1998) hypothesises that conditions that are bad f ...
... so-called sampling effect can arise due to an increased probability of including one species with atypically high productivity or efficient resource use, as the total species pool broadens (Fargione et al., 2007). The portfolio effect (Tilman et al., 1998) hypothesises that conditions that are bad f ...
Going Against the Flow - Non-Conventional Wisdom
... they use teeth to catch copepods, eggs, and larvae Like their movie cousins, they may also target prey as juveniles With grazing pressure removed, well-fertilized algae can blossom and lead to harmful algal blooms. Movie: young herring particulate feeding. A juvenile herring attacks four times i ...
... they use teeth to catch copepods, eggs, and larvae Like their movie cousins, they may also target prey as juveniles With grazing pressure removed, well-fertilized algae can blossom and lead to harmful algal blooms. Movie: young herring particulate feeding. A juvenile herring attacks four times i ...
A Science-Based Framework for Assessing the
... The scale of the project and its impacts, and the species and habitats being affected will all influence the extent to which potential impacts on productivity need to be described, and in some cases quantified. As a generalization (with exceptions), projects expected to have larger impacts or those ...
... The scale of the project and its impacts, and the species and habitats being affected will all influence the extent to which potential impacts on productivity need to be described, and in some cases quantified. As a generalization (with exceptions), projects expected to have larger impacts or those ...
Daphnia hybridization along ecological gradients in pelagic
... hybrid zones for hybridizing planktonic Daphnia (Crustacea: Cladocera); occasional dominance of interspecific hybrids over parental species was explained by their temporal superiority in fluctuating environments. However, water bodies with spatially varying environmental conditions might facilitate ...
... hybrid zones for hybridizing planktonic Daphnia (Crustacea: Cladocera); occasional dominance of interspecific hybrids over parental species was explained by their temporal superiority in fluctuating environments. However, water bodies with spatially varying environmental conditions might facilitate ...
Intersexual differences of heat shock response between two
... & Somero, 2002; Somero, 2012; Tomanek, 2010), behavior (Huey, 1991), and species interactions (e.g., Dell, Pawar & Savage, 2014). While increased ambient air temperatures create warmer average temperatures, surface waters such as lakes have likewise warmed worldwide (O’Reilly et al., 2015), thereby ...
... & Somero, 2002; Somero, 2012; Tomanek, 2010), behavior (Huey, 1991), and species interactions (e.g., Dell, Pawar & Savage, 2014). While increased ambient air temperatures create warmer average temperatures, surface waters such as lakes have likewise warmed worldwide (O’Reilly et al., 2015), thereby ...
Spatial and temporal structure of predator–prey relationships in the
... be expected to occur in space or within years. If, however, strong prey preferences exist, as our previous study (Pinnegar et al. 2003) suggested for certain predators, stomach contents at a given point in space and time would be expected to be not or only slightly related to prey availability at th ...
... be expected to occur in space or within years. If, however, strong prey preferences exist, as our previous study (Pinnegar et al. 2003) suggested for certain predators, stomach contents at a given point in space and time would be expected to be not or only slightly related to prey availability at th ...
Marine Ecology Progress Series 261:135
... greatly by human or urban waste and runoff, although possibly, on rare occasions, by mixing from hurricanes and runoff from large storms (Andrefouet et al. 2002). Cages were placed at 2 m depth in the lagoon on the windward side of a patch reef. Tidal range is small (< 0.5 m), currents are low to mo ...
... greatly by human or urban waste and runoff, although possibly, on rare occasions, by mixing from hurricanes and runoff from large storms (Andrefouet et al. 2002). Cages were placed at 2 m depth in the lagoon on the windward side of a patch reef. Tidal range is small (< 0.5 m), currents are low to mo ...
Examining Cause and Effect
... Mussels are an important food source for several different kinds of animals, including river otters and raccoons, as well as several fish species. Mussel shells form an important substrate to which algae and insect larvae attach themselves. (A substrate is an underlying surface on which other organi ...
... Mussels are an important food source for several different kinds of animals, including river otters and raccoons, as well as several fish species. Mussel shells form an important substrate to which algae and insect larvae attach themselves. (A substrate is an underlying surface on which other organi ...
Dynamics of aquatic organisms in a rice field ecosystem: effects of
... Simalungun district is one of the main rice producing areas in North Sumatera, Indonesia, covering an area of 4,386.6 km2 with an estimated human population of 830,986 in 2012 (BPSPSU 2014). Rice farming is one of the main agricultural activities. Several rice varieties (Ciherang, IR36, IR42, IR 64, ...
... Simalungun district is one of the main rice producing areas in North Sumatera, Indonesia, covering an area of 4,386.6 km2 with an estimated human population of 830,986 in 2012 (BPSPSU 2014). Rice farming is one of the main agricultural activities. Several rice varieties (Ciherang, IR36, IR42, IR 64, ...
ktf0371 - OceanDocs Home
... Fish reared in freshwater were transferred to freshwater, isotonic salinity (ISO 12%0) and 75%0 seawater (25%0) and a number of physiological parameters were measured. It was found that plasma Na+ and CI- were elevated one day after transfer to saltwater but returned to freshwater levels on day 4. P ...
... Fish reared in freshwater were transferred to freshwater, isotonic salinity (ISO 12%0) and 75%0 seawater (25%0) and a number of physiological parameters were measured. It was found that plasma Na+ and CI- were elevated one day after transfer to saltwater but returned to freshwater levels on day 4. P ...
Habitat Requirements for Coastal Coho Salmon Populations
... Chum salmon are dependent on nearshore marine habitats and survival during this period of early ocean residence can greatly influence total production. Studies have indicated that chum salmon remain in the near shore environment for varying periods depending on factors such as food availability, com ...
... Chum salmon are dependent on nearshore marine habitats and survival during this period of early ocean residence can greatly influence total production. Studies have indicated that chum salmon remain in the near shore environment for varying periods depending on factors such as food availability, com ...
Diversification in the Tropical Pacific: Comparisons Between Marine
... dispersal, and dispersal frequency (gene flow) is a major determinant of whether populations can become established and whether they differentiate from each other. If dispersal is too rare to lead to successful colonization, then an organism cannot become established. The absence of large suites of ...
... dispersal, and dispersal frequency (gene flow) is a major determinant of whether populations can become established and whether they differentiate from each other. If dispersal is too rare to lead to successful colonization, then an organism cannot become established. The absence of large suites of ...
Ronald H. Karlson - MISE@University of the Ryukyus
... important in affecting zoanthid distribution patterns in Discovery Bay as it is in Panama (Sebens, 1982), but data on its density, dispersion, and feeding preferences are not adequate at this time for comparing these two reefs. The Discovery Bay study sites can also be characterized by physical para ...
... important in affecting zoanthid distribution patterns in Discovery Bay as it is in Panama (Sebens, 1982), but data on its density, dispersion, and feeding preferences are not adequate at this time for comparing these two reefs. The Discovery Bay study sites can also be characterized by physical para ...
Michigan Department of Natural Resources 2009-85 Status of the Fishery Resource Report
... be 12 boat angler hours per acre (Ryckman and Lockwood 1985) for the open water season based on an on-site creel survey. This estimate was low compared to many other natural lakes and impoundments in the area. A fish survey was also conducted in August of 1982 when MDNR (Michigan Department of Natur ...
... be 12 boat angler hours per acre (Ryckman and Lockwood 1985) for the open water season based on an on-site creel survey. This estimate was low compared to many other natural lakes and impoundments in the area. A fish survey was also conducted in August of 1982 when MDNR (Michigan Department of Natur ...