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Full-Text Articles in Life Sciences
Fish Species Richness In Relation To Restored Oyster Reefs, Piankatank River, Virginia, Jm Harding, Roger L. Mann
Fish Species Richness In Relation To Restored Oyster Reefs, Piankatank River, Virginia, Jm Harding, Roger L. Mann
VIMS Articles
Fish assemblages in relation to “reef” structures in marine habitats have been and continue to be topics for research addressing ecological and management questions. Much effort has been spent describing and defining fish assemblages, or groups of species, associated with tropical coral reefs (e.g., Sale 1991 and chapters therein), temperate hard bottom or rocky reefs (e.g., Sedberry and Van Dolah, 1984; Ambrose and Swarbrick, 1989), tropical lava flows (e.g., Godwin and Kosaki, 1989), and artificial “fishing” reefs (e.g., Chandler et al., 1985; Hueckel and Buckley, 1987; Bohnsack, 1989; Feigenbaum et al., 1989; Rountree, 1989; Stephan and Lindquist, 1989). Temperate oyster …
Ontogenetic Changes In Habitat Use By Postlarvae And Young Juveniles Of The Blue Crab, Ra Pardieck, R J. Orth, R. J. Diaz, Rom Lipcius
Ontogenetic Changes In Habitat Use By Postlarvae And Young Juveniles Of The Blue Crab, Ra Pardieck, R J. Orth, R. J. Diaz, Rom Lipcius
VIMS Articles
Changing habitat requirements are evident during the developmental cycles of many species. In this field investigation, we attempted to distinguish between depth (shallow vs deep), habitat structure (seagrass species), and study site as factors influencing the distribution and abundance of postlarvae and juvenile blue crabs Callinectes sapidus in the Chesapeake Bay. Deep (greater than or equal to 70 cm mean low water [MLW]) and shallow (less than or equal to 50 cm MLW) suction samples in monospecific Zostera marina and Ruppia maritima beds were taken in the York River, a tributary of the Chesapeake Bay. Our studies revealed ontogenetic changes …
Correspondence Between Environmental Gradients And Summer Littoral Fish Assemblages In Low Salinity Reaches Of The Chesapeake Bay, Usa, Cm Wagner, Hm Austin
Correspondence Between Environmental Gradients And Summer Littoral Fish Assemblages In Low Salinity Reaches Of The Chesapeake Bay, Usa, Cm Wagner, Hm Austin
VIMS Articles
Patterns in the assemblage structure of littoral fishes occupying the gradient between riverine and estuarine ecosystems were revealed through multivariate analysis of 5 annual summer seine surveys in 4 tributary systems of the lower Chesapeake Bay. Catch per unit effort of fishes was quantified and environmental variables measured to characterize assemblage structure and population responses along large-scale (km) environmental gradients. Results of two-way indicator species analysis (TWINSPAN), detrended correspondence analysis (DCA) and detrended canonical correspondence analysis (DCCA) suggested the presence of 4 intergrading assemblages of littoral beach fishes: permanent tidal freshwater, lower tidal freshwater, oligohaline estuary and mesohaline estuary. Littoral …
Observations On The Biology Of The Veined Rapa Whelk, Rapana Venosa (Valenciennes, 1846) In The Chesapeake Bay, Juliana Harding, Roger L. Mann
Observations On The Biology Of The Veined Rapa Whelk, Rapana Venosa (Valenciennes, 1846) In The Chesapeake Bay, Juliana Harding, Roger L. Mann
VIMS Articles
The recent discovery of the Veined Rapa whelk (Rapana venosa, Valenciennes, 1846) in the lower Chesapeake Bay provides an opportunity to observe the initial biological and ecological consequences of a novel bioinvasion. These large predatory gastropods occur in subtidal, hard bottom habitats in the lower Bay and are capable of feeding, mating, and moving while completely burrowed. Hard clams (Mercenaria mercenaria) are consumed preferentially in the laboratory when offered concurrently with oysters (Crassostrea virginica), soft clams (Mya arenaria), and mussels (Mytilus edulis). Chesapeake Bay R. venosa readily open and consume large hard clams (30 to 85 mm SH) leaving no …
Phylogenetic Analysis Of Cytochrome C Oxidase I Sequences To Determine Higher-Level Relationships Within The Coleoid Cephalopods, Db Carlin, John Graves
Phylogenetic Analysis Of Cytochrome C Oxidase I Sequences To Determine Higher-Level Relationships Within The Coleoid Cephalopods, Db Carlin, John Graves
VIMS Articles
Until recently, the higher-level phylogenetic relationships of coleoid cephalopods have remained unclear. A thorough knowledge of the higher-level phylogeny of the group has been limited by the paucity of paleontological data for this poorly-fossilized group and the lack of cladistic analyses of developmental, morphological, and molecular data applied to the coleoids. In this study we analyzed a 657 base pair portion of the mitochondrial cytochrome c oxidase I (COI) gene from 48 cephalopod species representing a broad spectrum of coleoid diversity to examine higher-level phylogenetic relationships within the group. The COI gene exhibited a high degree of nucleotide sequence variability, …
Age, Growth, Longevity, And Mortality Of Blackcheek Tonguefish, Symphurus Plagiusa (Cynoglossidae : Pleuronectiformes), In Chesapeake Bay, Virginia, Mark R. Terwilliger, Thomas A. Munroe
Age, Growth, Longevity, And Mortality Of Blackcheek Tonguefish, Symphurus Plagiusa (Cynoglossidae : Pleuronectiformes), In Chesapeake Bay, Virginia, Mark R. Terwilliger, Thomas A. Munroe
VIMS Articles
Age structure, longevity, and mortality were determined for a population of blackcheek tonguefish, Symphurus plagiusa, in Chesapeake Bay. Blackcheek tonguefish (36-202 mm TL) were randomly collected by means of otter trawl in lower Chesapeake Bay and major Virginia tributaries (James, York, and Rappahannock rivers) from April 1994 through August 1995. Ages were determined by interpreting growth increments on thin transverse sections of sagittal otoliths. Marginal increment analysis showed that a single annulus was formed in June of each year. Blackcheek tonguefish caught during this study reached a maximum age of 5+ years. Growth was rapid during the first year, then …
Morphometric Separation Of Annual Cohorts Within Mid-Atlantic Bluefish, Pomatomus Saltatrix, Using Discriminant Function Analysis, Herbert Austin, Daniel Scoles, Allison J. Abell
Morphometric Separation Of Annual Cohorts Within Mid-Atlantic Bluefish, Pomatomus Saltatrix, Using Discriminant Function Analysis, Herbert Austin, Daniel Scoles, Allison J. Abell
VIMS Articles
Larval and tagging studies neither support nor refute the existence of two mid-Atlantic stocks of bluefish, Pomatomus saltatrix, one that spawns just south of Hatteras, North Carolina, in the spring, and the other off New England in the summer. Subsequent studies have suggested either a continuous spawning with two survival events, or two distinct spawning events, one in spring south of Hatteras, NC, and a second in mid-summer from Long Island to New England. Genetic studies have supported a single stock because they show the existence of a single gene pool. A stepwise linear discriminant function analysis (DFA) of morphometrics …