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Showing 1 to 20 of 49 for “"Trophic ecology"”.
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The Trophic Ecology of Psammechinus miliaris in Scottish Sea Lochs
Understanding the trophic relationships between organisms is crucial to understanding ecosystem functioning and as such regular echinoids have been termed keystone through the action of their grazing. Much research has focused on this group’s action as herbivores, but as a group omnivory is common. …
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Fish Assemblage Structure, Distribution, and Trophic Ecology at Northwestern Gulf of Mexico Banks
… factors on distribution, and 3) examine the trophic ecology of red snapper (Lutjanus campechanus), a common and highly prized reef-associated fish, at these features. Assemblage definition and relation to habitat was based upon baited underwater video surveys conducted across a range of …
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Spring Phenology and Trophic Ecology of Trees, Caterpillars, and Migrating Neotropical -Nearctic Songbirds
I investigated the trophic ecology of forest trees, caterpillars, and wood warblers (Parulidae) and vireos (Vireonidae) during spring migration in 2001--2003 at Trelease Woods, a deciduous forest fragment near Urbana, Illinois, USA (40°09'N, 88°10'W). I hypothesized that (1) the …
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Trophic Ecology of Mesopelagic Fish Larvae and Juveniles in the Northern Gulf of Mexico
… their early life history, including larval fish trophic ecology. An understanding of the role deep-pelagic fish larvae have in oceanic food webs is important in the development of ecosystem models that examine the connectivity (via vertical migrations) between the deep-pelagic and epipelagic …
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Distribution, Abundance, and Trophic Ecology of Anguilliform Leptocephali in the Northern Gulf of Mexico
… the northern Gulf of Mexico, and 2) examine the trophic ecology of leptocephali using stable isotope values of carbon and nitrogen (δ13C and δ15N). A 25-year (1990-2014) ichthyoplankton dataset provided by the National Oceanic and Atmospheric Administration (NOAA) Southeast Area Monitoring and …
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Movements, dive behavior and trophic ecology of leatherback turtles (Dermochelys coriacea) in the northwest Atlantic
<p>The endangered leatherback turtle is a highly migratory predator that feeds exclusively on gelatinous zooplankton. Leatherbacks spend most of their lives submerged or offshore, and their at-sea biology (particularly that of males and sub-adults) is poorly understood throughout much of their …
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Marine influence on juvenile fish trophic ecology and community dynamics in Maryland's northern coastal lagoons
Marine influence on Maryland's juvenile lagoon fish community was examined under varied levels of internal and external forcing. In 2009, stable isotope analysis showed increasing marine carbon dependency by bay anchovy with decreasing distance to the marine inlet. Following large seagrass losses, …
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Movement and trophic ecology of large pelagic fishes connecting surface waters with the Ocean’s Twilight Zone
… isotope analyses is also used to calculate trophic positions, providing a more detailed view of pelagic food web structure and function. To complement these trophic studies, I conduct a movement analysis of vertical habitat use by swordfish focused on their intermittent extreme dives. I …
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Movement and Trophic Ecology of Large Pelagic Fishes Connecting Surface Waters with the Ocean's Twilight Zone
… isotope analyses is also used to calculate trophic positions, providing a more detailed view of pelagic food web structure and function. To complement these trophic studies, I conduct a movement analysis of vertical habitat use by swordfish focused on their intermittent extreme dives. I …
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TROPHIC ECOLOGY OF JUVENILE LEAN AND SISCOWET LAKE TROUT (SALVELINUS NAMAYCHUSH) FROM U.S. WATERS OF LAKE SUPERIOR
… were observed in waters from 40-60m. Trophic position (as measured by δ 15N) was similar for both ecotypes at small sizes (mm), but Siscowet exhibited a higher trophic position than Lean Lake Trout at larger sizes (>400mm) and older ages (>5 years). Base of production (as measured by δ …
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Trophic Ecology of Largemouth Bass and Northern Pike in Allopatric and Sympatric Assemblages of Voyageurs National Park, Minnesota
… to ingest a variety of food items from multiple trophic levels.
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Fish Assemblage Structure, Trophic Ecology, and Potential Effects of Invading Asian Carps in Three Missouri River Tributaries, South Dakota
… that Silver Carp and Gizzard Shad overlapped trophically and the isotopic trophic niche of Emerald Shiner, which is usually pelagic, potentially moved to more benthic habitats and food sources as a result of Silver Carp presence. There were no perceived effects of Silver Carp on Bigmouth …
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Examining the trophic ecology of five myctophid genera in the southern Benguela using morphological, stomach content and stable isotope analyses
… genera still exist. This study examined the trophic ecology of five genera of myctophid fishes from the southern Benguela, namely Diaphus spp., Gymnoscopelus spp., Lampanyctodes hectoris, Lampanyctus spp. and Symbolophorus spp. Fishes were collected during DFFE research surveys conducted in …
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TROPHIC ECOLOGY OF SAILFISH LARVAE IN THE GULF OF MEXICO: AN ANALYSIS OF DIET, PREY AVAILABILITY, PREY QUALITY, AND INFLUENCES ON LARVAL GROWTH
… diets, limited foraging abilities, and oligotrophic offshore habitats. Variability in the recent growth of sailfish larvae was compared to environmental, spatial, diet, prey availability, and fatty acid metrics using data collected from near-surface waters in the northern Gulf of Mexico (2017 …
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The Consequences of Non-Native Species Invasions on the Contemporary and Historic Trophic Ecology of Native Sport Fish in a Lake Michigan Embayment
<p>The widespread establishment of dreissenid mussels (<em>Dreissena spp.</em>) in Lake Michigan has strongly altered energy flow by sequestering nutrients in nearshore benthic habitats. Despite these ecosystem changes, little is known about their influence on resource partitioning in nearshore …
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Trophic ecology of an introduced, land-locked alewife (Alosa pseudoharengus) population and assessment of alewife impact on resident sportfish and crustacean zooplankton communities in Claytor Lake, Virginia
Analysis of trophic and population ecology of an introduced (1968- 1969) alewife forage base and resident sportfishes (age 0 and older) indicated several negative trophic interactions within the community complex of Claytor Lake, Virginia. Alewife piscivority represents a potentially significant …
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Aspects of the conservation biology of Coregonus lavaretus in Britain
… show considerable variation in morphology, trophic ecology and life history. The variation in these populations warrants protection, one conservation action becoming more commonly utilised in Britain is conservation translocation. It was found that there were significant differences between …
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Reef fish demographics on Louisiana artificial reefs : the effects of reef size on biomass distribution and foraging dynamics
… and two toppled platforms, and to examine the trophic ecology of common reef-associated fishes, such as red snapper (Lutjanus campechanus). Spatial distribution of fish biomass was examined using a multifrequency hydroacoustic approach to examine the extent of the area of influence around the …
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