Marine Biology Commons^™

Pagurapseudes (Crustacea: Tanaidacea) In Southeastern Florida: Functional Morphology, Post-Marsupial Development, Ecology And Shell Use, Charles Messing

Oceanography Faculty Theses and Dissertations

Members of the genus Pagurapseudes occupy vacant microgastropod shells. Functional and behavioral convergence with paguridean decapods (hermit crabs) is treated using a combination of gross morphological, histological and scanning electron microscopic analyses, as well as observations of living animals. Post-embryological development is described and compared with that of other tanaidaceans. The proposed life history differs from that of other tanaidaceans in several respects and is the first described for any member of the suborder Monokonophora based on investigations using experimentally reared specimens. Variations in a population over the course of 1.5 years are discussed as are apparent habitat preferences. Preferences …

Structure Of A Subtidal Benthic Community Near Cape Charles, Virginia, R. Michael Ewing

Biological Sciences Theses & Dissertations

Species composition, distribution, and abundance of benthic invertebrates of a subtidal community were examined at a location on the lower Delmarva Peninsula near Cape Charles, Virginia. Macrobenthos was sampled quarterly between June, 1977 and June, 1978 at nine sites along a transect in Old Plantation Creek and the adjacent offshore area. Spatial and temporal patterns of numerically important species are discussed.

Sampling sites and species were grouped by a numerical classification strategy which consisted of the Bray-Curtis similarity measure and group-average clustering. Three faunal assemblages were identified with the aid of constancy and fidelity nodal analyses: (1) a tidal creek …

Atmospheric Forcing Of The Bight Of Abaco, Peter M. Smith

HCNSO Student Theses and Dissertations

No abstract provided.

Reproductive Variability In Lytechinus Variegatus (Echinodermata: Echinoidea) From Different Habitats In A Florida West Coast Estuary, Robert G. Ernest

USF Tampa Graduate Theses and Dissertations

Lytechinus variegatus (Lamarck, 1916) is a sea urchin inhabiting shallow sub-littoral environments from Beaufort, North Carolina to southern Brazil. Although it has been collected extensively for embryological material in the southeastern United States (Harvey, 1956; Brookbank, 1968). there have been relatively few studies of its reproduction. Gonad indices were used to follow its annual reproductive cycle at Bermuda and Miami (Moore et al., 1963; Moore and Lopez, 1972), while elsewhere, only observations of spawn- ing have been reported (Boolootian, 1966).

In the Anclote estuary near Tarpon Springs, Florida, Lytechinus is the most conspicuous of the macroepibenthic invertebrates, and where requisite …

Feeding Morphologies And Distribution Patterns Of Marine Cladocera In The Lower Chesapeake Bay, Sandra Layne Gilchrist

OES Theses and Dissertations

Temporal and spatial distributions of marine cladocera in the lower Chesapeake Bay estuary were observed over a year-long sampling period. The distributions of cladoceran species throughout the Bay were studied in relation to temperature and salinity. A survey of the species over the entire Bay is included to establish distribution patterns of the various species during a short time period.

Theoretical mathematical principles were used to predict feeding abilities of the Bay species. Mouthparts are described qualitatively and quantitatively to infer function. A mandibular index developed by Itoh (1970) was revised and employed in evaluating feeding methods interspecifically and interspecifically. …

The Spatial And Temporal Distribution Of Fish Eggs And Larvae In Hempstead Bay Estuary, Joseph Adelard Lessard

OES Theses and Dissertations

The ichthyoplankton of Hempstead Bay estuary was sampled from December 1972 to mid March 1974. Eleven stations were sampled by towing a 0.5 meter diameter plankton net. Eggs were most abundant during June and July with an average concentration calculated to be above 5,500/100m³. Egg densities were the lowest during the fall and winter. Larvae were most frequently taken from March through July with densities varying greatly among the samples. The eggs of Brevoortia tyrannus, Anchoa mitchilli, Tautoga onitis, Tautogolabrus adspersus, and Scophthalmus aguosus and the larvae of Menidia menidia, Ammodvtes hexapterus and Pseudopleuronectes americanus constituted most …

Distribution Of Macrobenthic Mollusca And Amphipoda In Relation To A Sharp Thermal Front: Cape Hatteras Region, North Carolina, Donald Paul Weston

Dissertations, Theses, and Masters Projects

No abstract provided.

An Evaluation Of Hydrocarbon Extraction Techniques For Tissue, Colleen Gail Becker

Dissertations, Theses, and Masters Projects

No abstract provided.

The Relationship Of Sexual Dimorphism And Differential Predation To Sex Ratio In Leptochelia Dubia (Crustacea: Tanaidacea), Joseph Anthony Mendoza

University of the Pacific Theses and Dissertations

Leptochelia dubia is a dioecious tube-building tanais, which broods its young and exhibits marked sexual dimorphism. The species is widely distributed in the Pacific, Atlantic, Mediterranean and Indian Oceans, but to date there are no published accounts of its ecology. L. dubia is one of the most abundant of the small Crustacea in Tomales Bay, where it may attain densities of 30,000/m² in soft bottom communities.

A Response Surface Investigation Of The Larval Tolerances Of Three Spionid Polychaetes To Temperature, Salinity And Food Concentration, Alan Louis Hillyard

University of the Pacific Theses and Dissertations

Response surface techniques were used to investigate the tolerances of the planktonic larvae of three spionid polychaetes to a variety of temperature and salinity combinations. Two of the spionids were morphologically very similar members of the genus Boccar.dia., B. proboscidea and B. columbiana which occupy nearly identical geographic ranges. The other was Polydora giardi a common coinhabitant with B. columbiana. In addition a third independent parameter, food concentration, was added to the study of B. columbiana and P. giardi.

The larvae of the two Boccardia species were extremely euryhaline, in marked contrast to those of Polydora giardi which were confined …

Structure, Function, And Functional Morphology Of Mitra Idae Melvill 1893 And M. Catalinae Dall 1920, Terry L. West

University of the Pacific Theses and Dissertations

The morphology of the proboscis--particularly the epiproboscis, the feeding behavior, the function(s) of the epiproboscis, and the functional morphology of the epiproboscis, were studied in Mitra idea Melville and fi. catalinae Dall (Gastropoda: Neogastropoda; Mitridae.

In M. idae, the epiproboscis is an extensible muscular J-shaped rod which curves under the odontophore, and lies parallel to the longitudinal axis of the proboscis. A muscular external sheath encloses that portion of the epiproboscis which lies within the proboscis haemacoel; an invaginated muscular-epithelial internal sheath covers the ventral part of the epiproboscis. The dorsal part of the epiproboscis consists principally of longitudinal muscle; …

Chitinoclastic Bacteria From The Mid-Atlantic Shelf: Distribution, Taxonomy, And Effect Of Oil On Growth And Chitin Degradation, Darbie Anne Lister

Dissertations, Theses, and Masters Projects

No abstract provided.

Planktonic Molluscan Faunal Structure Across A Large-Scale Environmental Gradient, Michael Vecchione

Dissertations, Theses, and Masters Projects

No abstract provided.

The Effect Of Body Size And Algal Suspension Density On Filtration Rate And Assimilation Efficiency Of Three Marine Mussels, Mytilus Californianus, Mytilus Edulis And Perna Canaliculus With Consideration Of The Growth Of Each Species, Thomas B. Mccormick Iii

University of the Pacific Theses and Dissertations

Rates of uptake of organic and inorganic suspended particulate material by suspension feeding bivalve molluscs have been studied since the nineteenth century (see Viallanes, 1892) . Studies have investigated molluscan feeding mechanisms, filtration capabilities, food assimilation and metabolism. The bulk of this work has been directed towards the mussel Mytilus edulis Linnaeus and the oyster Crassostrea virginica Gmelin (see reviews by Galtsoff, 1964; Ali, 1970; Jorgensen, 1975; 1976; and Winter, 1978). More recently the growth of mussels, oysters, clams and scallops has been quantitatively studied in controlled systems to assess the biological potential of these molluscs in an aquaculture setting …

The Faunal Assemblages, Community Structure And Life History Patterns Of Decapod Crustacea From The Middle Atlantic Bight, Elizabeth Lewis. Wenner

Dissertations, Theses, and Masters Projects

No abstract provided.

The Abundance, Distribution, And Bionomics Of The Family Macrouridae In The Norfolk Canyon Area, Robert W. Middleton

Dissertations, Theses, and Masters Projects

No abstract provided.

Animal-Sediment Relationship Study Of The Western Branch Of The Lynnhaven River, Charles Perry Seymour

Biological Sciences Theses & Dissertations

The animal-sediment relationships of the marine benthic infauna of an estuarine river system, Lynnhaven River, Virginia Beach, Virginia, were studied at six sites, sampled bimonthly for one year. Six species were found to dominate all of the sampling periods and sites for the year. The greatest number of individuals, biomass, and species were found at the sand sites. Deposit feeders were recorded in greater number than suspension feeders at both the sand and the mud sites.

Cluster and nodal analyses were successful in demonstrating animal-sediment relationships for the intertidal regions of the river system.