The importance of predation, cannibalism and resources for
... ability to act as herbivores, detritivores and predators. This polytrohic behaviour is rather unique in freshwater ecosystems. Several studies have shown that crayfish can have strong impacts on other benthic organisms through direct and indirect effects. Crayfish can for example totally exclude som ...
... ability to act as herbivores, detritivores and predators. This polytrohic behaviour is rather unique in freshwater ecosystems. Several studies have shown that crayfish can have strong impacts on other benthic organisms through direct and indirect effects. Crayfish can for example totally exclude som ...
Habitat Improvement for Native Fish in the Yolo Bypass
... species. These studies revealed the importance of Yolo Bypass floodplain inundation for native fish passage, spawning and rearing, as well as estuary food web processes. More specifically, the studies found that in drier years, when water does not flow over the Fremont Weir, adult fish migrating th ...
... species. These studies revealed the importance of Yolo Bypass floodplain inundation for native fish passage, spawning and rearing, as well as estuary food web processes. More specifically, the studies found that in drier years, when water does not flow over the Fremont Weir, adult fish migrating th ...
Nursery and Grow-out Techniques for Giant Clams
... Indo-Pacific in the form of a readily available and nutritious food source. However, in today’s cash driven economies, giant clams have also come to represent a source of export income in many Pacific Island nations. Current uses for farmproduced giant clams include; stock enhancement, aquarium pets ...
... Indo-Pacific in the form of a readily available and nutritious food source. However, in today’s cash driven economies, giant clams have also come to represent a source of export income in many Pacific Island nations. Current uses for farmproduced giant clams include; stock enhancement, aquarium pets ...
The Variable Position of Arctic Charr (Salvelinus alpinus (L.))
... lakes indicated that Arctic charr shifted from littoral to a more pelagic trophic niche with increasing lake area and fish species richness. The shift of Arctic charr to a more pelagic piscivorous niche in large lakes was evidently promoted by the existence of small, planktivorous prey fish species ...
... lakes indicated that Arctic charr shifted from littoral to a more pelagic trophic niche with increasing lake area and fish species richness. The shift of Arctic charr to a more pelagic piscivorous niche in large lakes was evidently promoted by the existence of small, planktivorous prey fish species ...
Ecological aspects of marine Vibrio bacteria
... gastroenteritis (e.g. Morris 1990, Kaper et al. 1995). In the 1970s, it was still thought that the V. cholerae was unable to survive long periods outside its human host but during the 1980s it was concluded that this bacterium was naturally occurring in aquatic environments (reviewed by Colwell 1996 ...
... gastroenteritis (e.g. Morris 1990, Kaper et al. 1995). In the 1970s, it was still thought that the V. cholerae was unable to survive long periods outside its human host but during the 1980s it was concluded that this bacterium was naturally occurring in aquatic environments (reviewed by Colwell 1996 ...
A history of the research on the early marine life of Pacific salmon off
... found to be more catholic in their diet. Over 4,000 juveniles were tagged in Chatham Sound and Johnstone Strait using spaghetti tags, but very low numbers were recovered. A concurrent study of marine distributions of young salmon by LeBrasseur and Parker (1964) showed that seaward migrations of youn ...
... found to be more catholic in their diet. Over 4,000 juveniles were tagged in Chatham Sound and Johnstone Strait using spaghetti tags, but very low numbers were recovered. A concurrent study of marine distributions of young salmon by LeBrasseur and Parker (1964) showed that seaward migrations of youn ...
STANDING CROP AND COMMUNITY STRUCTURE OF
... assisted in ide~~t-ification of algae, and Dr. Dewey Bunting aided in identification of rotife;rs • . Dr. Clinton Miller assisted in the preliminary experimental design and Dr. Robert Morrison assiated in the final analysis of data. ...
... assisted in ide~~t-ification of algae, and Dr. Dewey Bunting aided in identification of rotife;rs • . Dr. Clinton Miller assisted in the preliminary experimental design and Dr. Robert Morrison assiated in the final analysis of data. ...
Predicting the invasion success of an introduced
... the mixolimnion generally begins in April and persists through November. Average, daily surface water temperatures range from 6.7 to 29.4 °C (Gustaveson 1999), and midsummer surface temperatures are typically around 25 °C (Sollberger et al. 1989). Since the reservoir reached full pool in 1980, surfa ...
... the mixolimnion generally begins in April and persists through November. Average, daily surface water temperatures range from 6.7 to 29.4 °C (Gustaveson 1999), and midsummer surface temperatures are typically around 25 °C (Sollberger et al. 1989). Since the reservoir reached full pool in 1980, surfa ...
Grosholz et al. 2009
... Ecosystem Function Following Spartina alterniflora Invasion of Pacific Estuaries Edwin D. Grosholz, Lisa A. Levin, Anna C. Tyler, and Carlos Neira One of the most pervasive human impacts to salt marshes around the world is the introduction of nonnative species. Plant introductions to salt marsh syst ...
... Ecosystem Function Following Spartina alterniflora Invasion of Pacific Estuaries Edwin D. Grosholz, Lisa A. Levin, Anna C. Tyler, and Carlos Neira One of the most pervasive human impacts to salt marshes around the world is the introduction of nonnative species. Plant introductions to salt marsh syst ...
Invasion Dynamics of a Non-indigenous bivalve, Nuttallia obscurata
... Fig. 2.6. Varnish clam development trajectories based on larval rearing experiments for A) the first 48 hrs at ambient temperature and salinity (15ºC, 31 PSU), and 2-40 days at B) 9-20ºC and C) 15-20PSU. Bars denote developmental stage: veliger with velum only (clear bar), pediveliger with velum and ...
... Fig. 2.6. Varnish clam development trajectories based on larval rearing experiments for A) the first 48 hrs at ambient temperature and salinity (15ºC, 31 PSU), and 2-40 days at B) 9-20ºC and C) 15-20PSU. Bars denote developmental stage: veliger with velum only (clear bar), pediveliger with velum and ...
Tropical phytoplankton species and pigments of continental shelf
... Local blooms of the blue-green alga Trichodesmium spp. (up to lo3 trichomes 11) were observed in large windrows which extended at times for several kilometres. Large dinoflagellates were less important numerically and occurred with < 10 cells 1-l. Species diversity was characterised by dominancedive ...
... Local blooms of the blue-green alga Trichodesmium spp. (up to lo3 trichomes 11) were observed in large windrows which extended at times for several kilometres. Large dinoflagellates were less important numerically and occurred with < 10 cells 1-l. Species diversity was characterised by dominancedive ...
ingram et al 2012 evolution - Zoology, UBC
... rather than population type, so the LDA did not directly differentiate the population types. We used LDA instead of alternatives such as principal components analysis (PCA) because LDA isolates those characters that vary among populations by identifying axes that maximize variation among relative to ...
... rather than population type, so the LDA did not directly differentiate the population types. We used LDA instead of alternatives such as principal components analysis (PCA) because LDA isolates those characters that vary among populations by identifying axes that maximize variation among relative to ...
R ,
... structure and function. My results indicate that Bythotrephes reduces total abundance, biomass, and richness of zooplankton, especially cladoceran taxa, throughout the ice-free season. As a result of high predation pressure by the invader, total seasonal and epilimnetic zooplankton production was al ...
... structure and function. My results indicate that Bythotrephes reduces total abundance, biomass, and richness of zooplankton, especially cladoceran taxa, throughout the ice-free season. As a result of high predation pressure by the invader, total seasonal and epilimnetic zooplankton production was al ...
Link to PDF - orgs.miamioh.edu
... included, but a few Keratella taurocephala were present in every size fraction. Each size fraction was diluted with 2 L of Lake Giles water, and then equal aliquots of L. minutus and equal aliquots each of Daphnia and Cyclops were measured out. Because the ‘Daphnia addition’ and ‘Cyclops addition’ ...
... included, but a few Keratella taurocephala were present in every size fraction. Each size fraction was diluted with 2 L of Lake Giles water, and then equal aliquots of L. minutus and equal aliquots each of Daphnia and Cyclops were measured out. Because the ‘Daphnia addition’ and ‘Cyclops addition’ ...
Richness–productivity relationships between trophic levels in a
... 1993), and it can stabilize the dynamics of consumer populations, alter habitat complexity, and stabilize food webs that would be otherwise unstable (Moore et al. 2004). Although there appear to be strong eVects of detritus on attributes of many systems, investigations of how detritusderived product ...
... 1993), and it can stabilize the dynamics of consumer populations, alter habitat complexity, and stabilize food webs that would be otherwise unstable (Moore et al. 2004). Although there appear to be strong eVects of detritus on attributes of many systems, investigations of how detritusderived product ...
Effects of interactions between the green and brown food webs on
... decomposition) food webs on ecosystem functioning. Three interactions between the two food webs are studied: 1) nutrients recycled from all organisms in the food web couple the green and brown food webs through mutualistic/competitive interaction between primary producers and decomposers; 2) general ...
... decomposition) food webs on ecosystem functioning. Three interactions between the two food webs are studied: 1) nutrients recycled from all organisms in the food web couple the green and brown food webs through mutualistic/competitive interaction between primary producers and decomposers; 2) general ...
Chapter 6 ― Limiting Factors and Threats to Recovery
... population are classified as either key or secondary to provide strategic guidance to recovery actions. Oregon’s findings regarding LF/T include the concept of legacy threats; practices or events that occurred in the past (i.e., practices that do not occur today), initiating environmental conditions ...
... population are classified as either key or secondary to provide strategic guidance to recovery actions. Oregon’s findings regarding LF/T include the concept of legacy threats; practices or events that occurred in the past (i.e., practices that do not occur today), initiating environmental conditions ...
an article online about the origins of the algae
... determined to be native on the basis of fossil records), making inadvertent introductions by humans difficult to explain, given the recent worldwide synchrony of blooms. Although an alternative explanation is a long time lag between the initial introduction and the ability of D. geminata to produce ...
... determined to be native on the basis of fossil records), making inadvertent introductions by humans difficult to explain, given the recent worldwide synchrony of blooms. Although an alternative explanation is a long time lag between the initial introduction and the ability of D. geminata to produce ...
The diet of saltmarsh consumers - LSU Digital Commons
... top omnivore, Fundulus heteroclitus. Some P. pugio became more carnivorous when F. heteroclitus where reduced indicating top-down control of infauna by P. pugio mediated through behavior. In the long-term, anthropogenic effects could fundamentally alter food web structure by changing saltmarsh speci ...
... top omnivore, Fundulus heteroclitus. Some P. pugio became more carnivorous when F. heteroclitus where reduced indicating top-down control of infauna by P. pugio mediated through behavior. In the long-term, anthropogenic effects could fundamentally alter food web structure by changing saltmarsh speci ...
Document
... During the last hundred years ecosystem research has developed along two routes. On one hand there is an approach that describes a community as the sum of its traits. Here spatial and temporal variabilities of abundances of species come to the fore, which are defined by their population dynamics (e. ...
... During the last hundred years ecosystem research has developed along two routes. On one hand there is an approach that describes a community as the sum of its traits. Here spatial and temporal variabilities of abundances of species come to the fore, which are defined by their population dynamics (e. ...
Estuarine Nutrient Cycling - The Influence of
... 1995; Schramm 1996). These inherent differences may influence the way that different plant types respond to environmental changes (for example eutrophication), but we also expect that they affect the fate of organic matter produced during photosynthesis and, thus, modify major pathways of energy, ca ...
... 1995; Schramm 1996). These inherent differences may influence the way that different plant types respond to environmental changes (for example eutrophication), but we also expect that they affect the fate of organic matter produced during photosynthesis and, thus, modify major pathways of energy, ca ...
Habitat Selection Among Fishes and Shrimp in the Pelagic
... found that molluscan assemblage in the southern Mediterranean Sea was correlated to the different attributes of algal architecture; assemblage abundance and number of species was higher on more complex algae. Clearly, structural differences in habitat can affect species richness and diversity of epi ...
... found that molluscan assemblage in the southern Mediterranean Sea was correlated to the different attributes of algal architecture; assemblage abundance and number of species was higher on more complex algae. Clearly, structural differences in habitat can affect species richness and diversity of epi ...
Community dynamics of ephemeral systems: food web
... concentration of playas, many other regions have similar habitats. One reason why these ecosystems have been studied less than similar habitats, such as the vernal pools of California, is their unpredictability. Many playas exist in quite arid regions, where rainfall patterns are highly isolated and ...
... concentration of playas, many other regions have similar habitats. One reason why these ecosystems have been studied less than similar habitats, such as the vernal pools of California, is their unpredictability. Many playas exist in quite arid regions, where rainfall patterns are highly isolated and ...
Benthic protists: the under
... (Table 1). For details on sampling protocols, nucleic acid extraction, 454-pyrosequencing of the hypervariable V4 18S rDNA region and data processing see Massana et al. (2015). Briefly, RNA from benthic samples was extracted from 2.5 g of surficial sediment using the Power Soil RNA kit (MoBio, Carls ...
... (Table 1). For details on sampling protocols, nucleic acid extraction, 454-pyrosequencing of the hypervariable V4 18S rDNA region and data processing see Massana et al. (2015). Briefly, RNA from benthic samples was extracted from 2.5 g of surficial sediment using the Power Soil RNA kit (MoBio, Carls ...
Benthic protists: the under-charted majority
... (Table 1). For details on sampling protocols, nucleic acid extraction, 454-pyrosequencing of the hypervariable V4 18S rDNA region and data processing see Massana et al. (2015). Briefly, RNA from benthic samples was extracted from 2.5 g of surficial sediment using the Power Soil RNA kit (MoBio, Carls ...
... (Table 1). For details on sampling protocols, nucleic acid extraction, 454-pyrosequencing of the hypervariable V4 18S rDNA region and data processing see Massana et al. (2015). Briefly, RNA from benthic samples was extracted from 2.5 g of surficial sediment using the Power Soil RNA kit (MoBio, Carls ...
Ecology of the San Francisco Estuary
The San Francisco Estuary together with the Sacramento-San Joaquin River Delta represents a highly altered ecosystem. The region has been heavily re-engineered to accommodate the needs of water delivery, shipping, agriculture, and most recently, suburban development. These needs have wrought direct changes in the movement of water and the nature of the landscape, and indirect changes from the introduction of non-native species. New species have altered the architecture of the food web as surely as levees have altered the landscape of islands and channels that form the complex system known as the Delta.This article deals particularly with the ecology of the low salinity zone (LSZ) of the estuary. Reconstructing a historic food web for the LSZ is difficult for a number of reasons. First, there is no clear record of the species that historically have occupied the estuary. Second, the San Francisco Estuary and Delta have been in geologic and hydrologic transition for most of their 10,000 year history, and so describing the ""natural"" condition of the estuary is much like ""hitting a moving target"". Climate change, hydrologic engineering, shifting water needs, and newly introduced species will continue to alter the food web configuration of the estuary. This model provides a snapshot of the current state, with notes about recent changes or species introductions that have altered the configuration of the food web. Understanding the dynamics of the current food web may prove useful for restoration efforts to improve the functioning and species diversity of the estuary.