Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 7 of 7
Full-Text Articles in Life Sciences
A Statistical Model To Predict The Incidence Of Pathogenic Protozoa (Amoebida: Acanthamoebidae) In Oceanic Sediments Using Surrogate Variables, Carl Robert Berman Jr
A Statistical Model To Predict The Incidence Of Pathogenic Protozoa (Amoebida: Acanthamoebidae) In Oceanic Sediments Using Surrogate Variables, Carl Robert Berman Jr
Dissertations, Theses, and Masters Projects
Surrogate contaminant variables (heavy metals, organics, physical oceanograpic data) can be used to predict the incidence of positive cultures of Acanthamoeba sp. in oceanic sediments. Amoebae data are drawn from five years of study involving stations in Narragansett Bay, Rhode Island, the New York Bight, and the Philadelphia-Camden dumpsite, and associated pollution parameters are drawn from literature sources, computerized marine pollution data bases, and other archives. The Statistics Analysis System (SAS) MAXR('2) improvement technique (stepwise regression) and general linear model procedures are used to generate correlations for surrogate variables and produce final predictive models and tables. Model procedures for the …
Energy Utilization In Bay Anchovy And Black Sea Bass Eggs And Larvae Contrasting Ecological Roles, John Wotring Tucker Jr
Energy Utilization In Bay Anchovy And Black Sea Bass Eggs And Larvae Contrasting Ecological Roles, John Wotring Tucker Jr
Dissertations, Theses, and Masters Projects
The objective of this study was a comparison of developmental changes and energy utilization in eggs, unfed larvae, and fed larvae of two marine fish species that both have pelagic early stages, but differ in phylogeny and early life ecology. The bay anchovy (Anchoa mitchilli), a clupeiform, spawns in estuaries and shallow coastal waters. The black sea bass (Centropristis striata striata), a perciform, spawns offshore at 15-50 m depths. Densities of zooplankton eaten by first-feeding fish larvae are normally higher in coastal waters than offshore. An important determinant of survival of larval fishes is their ability to fulfill nutritional requirements …
Climate Scale Environmental Factors Affecting Year-Class Fluctuations Of Atlantic Croaker (Micropogonias Undulatus) In The Chesapeake Bay (Maryland, Virginia), Brenda L. Norcross
Climate Scale Environmental Factors Affecting Year-Class Fluctuations Of Atlantic Croaker (Micropogonias Undulatus) In The Chesapeake Bay (Maryland, Virginia), Brenda L. Norcross
Dissertations, Theses, and Masters Projects
A conceptual life history of the Atlantic croaker (Micropogonias undulatus) identifies the effects of the environment on juvenile recruitment. In a multi-disciplinary approach to modelling, the major effects are investigated, quantified and presented in a flow chart. The model is divided into three sub models, each representing a major component which affects juvenile recruitment. North/south spawning location in the Mid-Atlantic Bight is affected by the bottom water temperature as influenced by the cessation of the summer winds in relation to timing of croaker migration. The pelagic phase is the most critical time in the life history of a larval croaker …
Benthic Polychaeta Of The Middle Atlantic Bight: Feeding And Distribution, Gary Russell Gaston
Benthic Polychaeta Of The Middle Atlantic Bight: Feeding And Distribution, Gary Russell Gaston
Dissertations, Theses, and Masters Projects
Patterns in the distribution of feeding-biology categories of polychaetous annelids were used to characterize benthic habitats of the Middle Atlantic Bight. Feeding biology classifications were based on recent publications regarding polychaete feeding and on gut-contents analyses of polychaetes collected in the study area. Proportion of carnivorous polychaetes was greatest in coarser sediments, and decreased significantly with depth across the continental shelf. Surface deposit feeders numerically dominated most habitats. Abundance of surface deposit feeders decreased across the continental shelf and sharply increased at the shelf break, paralleling the pattern of water-column production. Proportion of subsurface deposit feeders was greatest in fine-sediment …
An Environmental Model Predicting The Relative Recruitment Success Of Blue Crab, Callinectes Sapidus (Rathbun), In Chesapeake Bay, Virginia, Andrew Jackson Applegate
An Environmental Model Predicting The Relative Recruitment Success Of Blue Crab, Callinectes Sapidus (Rathbun), In Chesapeake Bay, Virginia, Andrew Jackson Applegate
Dissertations, Theses, and Masters Projects
No abstract provided.
Distribution Of Macrobenthic Invertebrates On The North Carolina Continental Shelf With Consideration Of Sediment, Hydrography And Biogeography, Donald Paul Weston
Distribution Of Macrobenthic Invertebrates On The North Carolina Continental Shelf With Consideration Of Sediment, Hydrography And Biogeography, Donald Paul Weston
Dissertations, Theses, and Masters Projects
The macrobenthic invertebrates of the North Carolina continental shelf in the vicinity of Cape Hatteras were sampled during four seasonal cruises, June 1977 to January 1978. Macrobenthos-sediment relationships were investigated in the area surrounding Diamond Shoals. Four benthic assemblages were recognized, each representative of specific sediment regimes. The results of multivariate analyses were interpreted as indicating that the percentages of very fine sand and silt and clay were of greatest biological significance. It is suggested that the importance of finer particles is due to their influence on sediment permeability and organic content. The degree of particle sorting was also important …
Life History And Secondary Production Of The Crustacean Gammarus Mucronatus Say (Amphipoda: Gammaridae) In Warm Temperate Estuarine Habitats, York River, Virginia, Thomas J. Fredette
Life History And Secondary Production Of The Crustacean Gammarus Mucronatus Say (Amphipoda: Gammaridae) In Warm Temperate Estuarine Habitats, York River, Virginia, Thomas J. Fredette
Dissertations, Theses, and Masters Projects
In order to assess the secondary production potential of the amphipod Gammarus mucronatus its life history was examined with laboratory experimentation and field sampling in two warm temperate estuarine habitats in the York River, Virginia. A seagrass (Zostera marina) bed and a macroalgae (Ulva spp., Enteromorpha spp.) fouling community on old pier pilings. Variations in amphipod abundance between the habitats were not similar. G. mucronatus was present in the seagrass habitat during most of the year attaining maximum densities of 1200(.)m('-2) in the spring. Presence of G. mucronatus in the macroalgae habitat was almost totally restricted to late spring and …