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Full-Text Articles in Life Sciences
Population Dynamics And Habitat Partitioning By Size, Sex, And Molt Stage Of Blue Crabs Callinectes Sapidus In A Subestuary Of Central Chesapeake Bay, Anson H. Hines, Romauld N. Lipcius, A. Mark Haddon
Population Dynamics And Habitat Partitioning By Size, Sex, And Molt Stage Of Blue Crabs Callinectes Sapidus In A Subestuary Of Central Chesapeake Bay, Anson H. Hines, Romauld N. Lipcius, A. Mark Haddon
VIMS Articles
Abundances, size-frequency distributions, sexual composition and molt-stage composition of blue crabs Callinectes sapjdus were measured during 1983 to 1985 in the Rhode River, a subestuary of central Chesapeake Bay, USA. Crabs at the mouth and head of the river basin were sampled with monthly triplicate otter trawls. Crabs in the principal tidal creek of the river were sampled 3 d a week with a fish weir, which caught crabs moving upstream and downstream separately. Crabs exhibited consistent, marked seasonal cycles in abundance as well as considerable annual variation in July peak abundances. New recruits entered the subestuary in late fall …
A Comparison Of The Age And Growth Of The Tiger Shark, Galeocerdo-Cuvieri, From Off Virginia And From The Northwestern Gulf-Of-Mexico, Steve Branstetter, John A. Musick, James A. Colvocoresses
A Comparison Of The Age And Growth Of The Tiger Shark, Galeocerdo-Cuvieri, From Off Virginia And From The Northwestern Gulf-Of-Mexico, Steve Branstetter, John A. Musick, James A. Colvocoresses
VIMS Articles
Lengths at age and growth rates for the tiger shark, Galeocerdo cuvieri. in the northwestern Atlantic and Gulf of Mexico were estimated from bands formed seasonally in the vertebral centra. The tiger shark grows rapidly compared with many other shark species. Growth rates for Gulf of Mexico juveniles were faster than for Atlantic juveniles. This produced significantly different (P < 0.01) estimates of the parameters of von Bertalanffy curves for the two regional samples. With sexes combined, parameter estimates for the Gulf of Mexico sample were L"" = 388 cm TL. K "" 0.184. to = -1.13 years; for the Atlantic sample they were L"" = 440 cm TL, K = 0.107, to = -2.35 years. Males mature at approximately 310 cm TL, females at 315-320 cm TL, but the regional differences in juvenile growth rates result in different ages at maturity. In the Gulf of Mexico. males mature in 7 years. females in 8 years; in the Atlantic. males and females both mature in approximately 10 years. The largest male and female examined (381 cm TL) were 15 and 16 years of age.
Utilization Of A Seagrass Meadow And Tidal Marsh Creek By Blue Crabs Callinectes Sapidus. I. Seasonal And Annual Variations In Abundance With Emphasis On Post-Settlement Juveniles, R J. Orth, J Van Montfrans
Utilization Of A Seagrass Meadow And Tidal Marsh Creek By Blue Crabs Callinectes Sapidus. I. Seasonal And Annual Variations In Abundance With Emphasis On Post-Settlement Juveniles, R J. Orth, J Van Montfrans
VIMS Articles
No abstract provided.
Oxygen Production And Consumption Associated With The Major Autotrophic Components In Two Temperate Seagrass Communities*, L Murray, Rl Wetzel
Oxygen Production And Consumption Associated With The Major Autotrophic Components In Two Temperate Seagrass Communities*, L Murray, Rl Wetzel
VIMS Articles
No abstract provided.
Bridging The Gap Between Economic-Theory And Fisheries Management - Can The Mfcma Produce Economically Rational Management - Discussion, James E. Kirkley
Bridging The Gap Between Economic-Theory And Fisheries Management - Can The Mfcma Produce Economically Rational Management - Discussion, James E. Kirkley
VIMS Articles
No abstract provided.
Effect Of Air-Supersaturated Sea Water On Argopecten Irradians Concentricus (Say) And Crassostrea Virginica (Gmelin), Robert Bisker, Michael Castagna
Effect Of Air-Supersaturated Sea Water On Argopecten Irradians Concentricus (Say) And Crassostrea Virginica (Gmelin), Robert Bisker, Michael Castagna
VIMS Articles
Argopecten irradians concentricus and Crassostrea virginica were exposed to several different levels of supersaturated seawater at temperatures ranging from 10 to 2!°C. Gas bubble trauma occurred at a total gas saturation level of 116%, causing mortality in juvenile A. i. concentricus and reduced growth in juvenile C. virginica.
A Multispecies Aggregation Of Cirrate Octopods Trawled From North Of The Bahamas, Michael Vecchione
A Multispecies Aggregation Of Cirrate Octopods Trawled From North Of The Bahamas, Michael Vecchione
VIMS Articles
Two cruises in the western North Atlantic collected 38 trawl samples between the Bahamas and New England. Of the 22 cirrate octopods taken in these samples, 17 came from the area north of the Bahamas. Pooled catch rate (specimens per hour of bottom trawling time) was significantly higher north of the Bahamas than in any other area sampled. Although the taxonomy of these gelatinous benthopelagic cephalopods is not yet settled, morphological characters from these specimens indicate that this aggregation includes at least four species. Only one species (Cirrothauma murrayi) was widely distributed in these samples.
Aspects Of The Biology Of Virginia's Sea Turtles: 1979-1986, J. A. Keinath, J. A. Musick, R. A. Byles
Aspects Of The Biology Of Virginia's Sea Turtles: 1979-1986, J. A. Keinath, J. A. Musick, R. A. Byles
VIMS Articles
Research has been carried out on sea turtles in Chesapeake Bay and adjacent waters since 1979. Chesapeake Bay supports populations of juvenile loggerhead, Caretta caretta (Linnaeus) and Kemp's ridley, Lepidochelys kempi (Garmon) sea turtles during summer. Data from our aerial surveys and biotelemetry studies show that turtles migrate northward from south of Cape Hatteras and enter the Bay during spring. We estimate between 2000 and 10,000 loggerheads utilize the Bay during summer, where they forage for abundant invertebrate fauna. Fifty to 200 sea turtles strand dead on shore each year. At least one-third of the deaths are attributable to human …
Comparative Attachment, Growth And Mortalities Of Oyster (Crassostrea Virginica) Spat On Slate And Oyster Shell In The James River, Virginia, D. S. Haven, J. M. Zeigler, J. T. Dealteris, J. P. Whitcomb
Comparative Attachment, Growth And Mortalities Of Oyster (Crassostrea Virginica) Spat On Slate And Oyster Shell In The James River, Virginia, D. S. Haven, J. M. Zeigler, J. T. Dealteris, J. P. Whitcomb
VIMS Articles
Slate was investigated as a substitute for oyster shells which are used as a substrate for oyster spat (Crassostrea virginica) settlement in James River, Virginia oyster repletion programs. Oyster shells and slate fragments were planted on adjacent plots in two submerged locations about 825 m apart in July 1984. Quantitative .093 m2 (one ft2) samples were collected by a diver on seven occasions through July 1985, with additional samples collected from teh natural oyster bottoms adjacent to the two areas. Percent mortality, growth and numbers of live spat and spat scars (dead spat) per unit area of bottom were determined. …
Feeding Habitats Of Spot, Leiostomus-Xanthurus, In Polyhaline Versus Meso-Oligohaline Tidal Creeks And Shoals, Steven P. O'Neil, Michael P. Weinstein
Feeding Habitats Of Spot, Leiostomus-Xanthurus, In Polyhaline Versus Meso-Oligohaline Tidal Creeks And Shoals, Steven P. O'Neil, Michael P. Weinstein
VIMS Articles
No abstract provided.
Effect Of Fixation On Particle Retention By Microflagellates: Underestimation Of Grazing Rates, Me Sieracki, Lw Haas, Da Caron, Ej Lessard
Effect Of Fixation On Particle Retention By Microflagellates: Underestimation Of Grazing Rates, Me Sieracki, Lw Haas, Da Caron, Ej Lessard
VIMS Articles
No abstract provided.
The Physiography And Extent Of Public Oyster Grounds In Pocomoke Sound, Virginia., James P. Whitcomb, Dexter S. Haven
The Physiography And Extent Of Public Oyster Grounds In Pocomoke Sound, Virginia., James P. Whitcomb, Dexter S. Haven
VIMS Articles
Public oyster grounds in Pocomoke Sound, Virginia, were charted in 1978 using an electronic positioning system to locate areas ~f oysters, shell, sand or mud. Over five thousand stations were occupied and 1,267 samples of the substrate were taken with hydraulically operated patent tongs. The information was used to draw large scale charts showing shorelines, depths, bottom types and out lines of public grounds. Substrates, elevations, slopes, oyster densities and spatfall levels were analyzed.
Predation On Single Spat Oysters Crassostrea Virginica (Gmelin) By Blue Crabs Callinectes Sapidus Rathbun And Mud Crabs Panopeus Herbstii Milne-Edwards, Robert Bisker, Michael Castagna
Predation On Single Spat Oysters Crassostrea Virginica (Gmelin) By Blue Crabs Callinectes Sapidus Rathbun And Mud Crabs Panopeus Herbstii Milne-Edwards, Robert Bisker, Michael Castagna
VIMS Articles
Single spat oysters Crassostrea virginica of four size classes (3.4-24.6 mm mean shell heights [SH]) were offered to six size classes of blue crabs Ca/linectes sapidus (9.3-85.5 mm mean carapace width [CW]) and five size classes of mud crabs Panopeus herbstii (7.1-34.4 mm mean CW) for 48 hr. Predation rate, recorded as the number of dead oyster spat/crab/day, was directly proportional to crab size and inversely proportional to oyster size. Mud crabs of 34.4 mm CW and blue crabs of 85 .5 mm CW had predation rates of 22.5 and 16.7 spat/crab/day on oyster spat of 24.6 and 24.4 mm …