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Full-Text Articles in Life Sciences
Comparison Of Age-Frequency Distributions For Ocean Quahogs Arctica Islandica On The Western Atlantic Us Continental Shelf, Sara M. Pace, Eric N. Powell, Roger L. Mann, M. Chase Long
Comparison Of Age-Frequency Distributions For Ocean Quahogs Arctica Islandica On The Western Atlantic Us Continental Shelf, Sara M. Pace, Eric N. Powell, Roger L. Mann, M. Chase Long
VIMS Articles
Geographic differences in the age structure of 4 populations of ocean quahogs Arctica islandica throughout the range of the stock within the US exclusive economic zone were examined. The ages of animals fully recruited to the commercial fishery (≥80 mm shell length) were estimated using annual growth lines in the hinge plate. The observed age frequency from each site was used to develop an age−length key enabling reconstruction of the population age frequency for the site. Within-site variability was high for both age-at-length and length-at-age; a single age−length key could not be applied and would not result in accurate age …
Satellite Tracking And Site Fidelity Of Short Ocean Sunfish, Mola Ramsayi, In The Galapagos Islands, Tierney M. Thys, Alex R. Hearn, Kevin C. Weng, John P. Ryan, César A Peñaherrera-Palm
Satellite Tracking And Site Fidelity Of Short Ocean Sunfish, Mola Ramsayi, In The Galapagos Islands, Tierney M. Thys, Alex R. Hearn, Kevin C. Weng, John P. Ryan, César A Peñaherrera-Palm
VIMS Articles
Ocean sunfishes, with their peculiar morphology, large size, and surface habits, are valuable assets in ecotourism destinations worldwide. This study investigates site fidelity and long-range movements of short ocean sunfish, Mola ramsayi (Giglioli 1883), at Punta Vicente Roca (PVR) off Isabela Island in the Galapagos Islands. Five individuals were tracked between 32 and 733 days using ultrasonic receivers and transmitters. Two of the 5 were also tracked with towed pop-off satellite tags. One travelled to the equatorial front covering 2700 km in 53 days, with dive depths in the upper 360 m at temperatures between 9.2°C and 22°C. During its …
Oyster (Crassostrea Virginica [Gmelin, 1791]) Mortality At Prolonged Exposures To High Temperature And Low Salinity, Melissa Southworth, M. Chase Long, Roger L. Mann
Oyster (Crassostrea Virginica [Gmelin, 1791]) Mortality At Prolonged Exposures To High Temperature And Low Salinity, Melissa Southworth, M. Chase Long, Roger L. Mann
VIMS Articles
Mortality of two size classes (35 mm) of eastern oysters Crassostrea virginica when exposed to combinations of low salinity (1, 2, 3, and 4) for extended periods (up to 30 days) at summer water temperatures typical of the Virginia Chesapeake Bay subestuaries was examined. A critical salinity-temperature combination of less than two at greater than 28 degrees C for more than 1 wk exposure for oyster mortality is suggested. A review of limited historical salinity-temperature tolerance data suggest selection of local populations of oysters having differing salinity tolerances. Such selection may prove critical to persistence of low-salinity populations in the …
Population And Reproductive Biology Of The Channeled Whelk, Busycotypus Canaliculatus, In The Us Mid-Atlantic, Robert A. Fisher, David Rudders
Population And Reproductive Biology Of The Channeled Whelk, Busycotypus Canaliculatus, In The Us Mid-Atlantic, Robert A. Fisher, David Rudders
VIMS Articles
Channeled whelks, Busycotypus canaliculatus, support commercial fisheries throughout their range along the US Atlantic seaboard. Given the modest amounts of published information available on channeled whelk, this study focuses on understanding the temporal and spatial variations in growth and reproductive biology in the Mid-Atlantic region. Channeled whelks were sampled from three inshore commercially harvested resource areas in the US Mid-Atlantic: Ocean City, MD (OC); Eastern Shore of Virginia (ES); and Virginia Beach, VA (VB). The largest whelk measured 230-mm shell length (SL) and was recorded from OC. Mean SL was largest in OC site (158.1 mm), followed by ES (137.6 …
Redox Reactions And Weak Buffering Capacity Lead To Acidification In The Chesapeake Bay, Wei-Jun Cai, Wei-Jen Huang, George W. Luther Iii, Denis Pierrot, Ming Li, Jeremy Testa, Ming Xue, Andrew Joesoef, Roger L. Mann, Jean Brodeur, Yuan-Yuan Xu, Baoshan Chen, Najid Hussain, George G. Waldbusser, Jeffery Cornwell, W. Michael Kemp
Redox Reactions And Weak Buffering Capacity Lead To Acidification In The Chesapeake Bay, Wei-Jun Cai, Wei-Jen Huang, George W. Luther Iii, Denis Pierrot, Ming Li, Jeremy Testa, Ming Xue, Andrew Joesoef, Roger L. Mann, Jean Brodeur, Yuan-Yuan Xu, Baoshan Chen, Najid Hussain, George G. Waldbusser, Jeffery Cornwell, W. Michael Kemp
VIMS Articles
The combined effects of anthropogenic and biological CO2 inputs may lead to more rapid acidification in coastal waters compared to the open ocean. It is less clear, however, how redox reactions would contribute to acidification. Here we report estuarine acidification dynamics based on oxygen, hydrogen sulfide (H2S), pH, dissolved inorganic carbon and total alkalinity data from the Chesapeake Bay, where anthropogenic nutrient inputs have led to eutrophication, hypoxia and anoxia, and low pH. We show that a pH minimum occurs in mid-depths where acids are generated as a result of H2S oxidation in waters mixed upward from the anoxic depths. …
Valuing Ecosystem Services: Oysters, Denitrification, And Nutrient Trading Programs, Gs Depiper, Dw Lipton, Rn Lipcius
Valuing Ecosystem Services: Oysters, Denitrification, And Nutrient Trading Programs, Gs Depiper, Dw Lipton, Rn Lipcius
VIMS Articles
As part of their strategy to meet total maximum daily load restrictions in the Chesapeake Bay, managers have developed nutrient trading markets to curb nitrogen and phosphorus flows into the estuarine system. Historically, nutrient trading programs have been restricted to credits between point sources or for agricultural mitigation technologies, such as the planting of cover crops. However, the denitrification and nutrient sequestration associated with oyster reefs has recently been a topic of much biological research. We investigate the role that nutrient credits for ecosystem services provided by restored oyster reefs can play in optimally managing oyster reef complexes by developing …
Forensic Reconstruction Of Ictalurus Punctatus Invasion Routes Using On-Line Fishermen Records, Filipe Banha, Ana Verissimo, Filipe Ribeiro, Anastacio Filipe
Forensic Reconstruction Of Ictalurus Punctatus Invasion Routes Using On-Line Fishermen Records, Filipe Banha, Ana Verissimo, Filipe Ribeiro, Anastacio Filipe
VIMS Articles
In this work, the presence of the channel catfish Ictalurus punctatus in the Portuguese section of the Guadiana drainage (Iberian Peninsula) is confirmed based on morphological and molecular species identification. The spatial and temporal dispersal of this non-native catfish was also reconstructed for the Guadiana drainage, based mostly on online fishermen records with minor contributions from the few scientific reports available. The obtained records (mainly from angling fora) span the period since the species' first reported presence in Iberia (1980s) up to the present, and support a westward invasion pattern of non-native fish (NNF) reported for the Iberian fish invasion …
World Without Borders-Genetic Population Structure Of A Highly Migratory Marine Predator, The Blue Shark (Prionace Glauca), Ana Verssimo, Iris Sampaio, Jan Mcdowell, Paulo Alexandrino, Gonzalo Mucientes, Nuno Queiroz, Charlene Da Silva, Catherine S. Jones, Leslie R. Noble
World Without Borders-Genetic Population Structure Of A Highly Migratory Marine Predator, The Blue Shark (Prionace Glauca), Ana Verssimo, Iris Sampaio, Jan Mcdowell, Paulo Alexandrino, Gonzalo Mucientes, Nuno Queiroz, Charlene Da Silva, Catherine S. Jones, Leslie R. Noble
VIMS Articles
Highly migratory, cosmopolitan oceanic sharks often exhibit complex movement patterns influenced by ontogeny, reproduction, and feeding. These elusive species are particularly challenging to population genetic studies, as representative samples suitable for inferring genetic structure are difficult to obtain. Our study provides insights into the genetic population structure one of the most abundant and wide-ranging oceanic shark species, the blue shark Prionace glauca, by sampling the least mobile component of the populations, i.e., young-of-year and small juveniles (year; N = 348 individuals), at three reported nursery areas, namely, western Iberia, Azores, and South Africa. Samples were collected in two different time …
Aquaculture Genomics, Genetics And Breeding In The United States: Current Status, Challenges, And Priorities For Future Research, Hisham Abdelrahman, Standish K. Allen Jr.
Aquaculture Genomics, Genetics And Breeding In The United States: Current Status, Challenges, And Priorities For Future Research, Hisham Abdelrahman, Standish K. Allen Jr.
VIMS Articles
Advancing the production efficiency and profitability of aquaculture is dependent upon the ability to utilize a diverse array of genetic resources. The ultimate goals of aquaculture genomics, genetics and breeding research are to enhance aquaculture production efficiency, sustainability, product quality, and profitability in support of the commercial sector and for the benefit of consumers. In order to achieve these goals, it is important to understand the genomic structure and organization of aquaculture species, and their genomic and phenomic variations, as well as the genetic basis of traits and their interrelationships. In addition, it is also important to understand the mechanisms …
Multispecies Extensions To A Nonequilibrium Length-Based Mortality Estimator, Quang C. Huynh, Todd Gedamke, John M. Hoenig, Clay Porch
Multispecies Extensions To A Nonequilibrium Length-Based Mortality Estimator, Quang C. Huynh, Todd Gedamke, John M. Hoenig, Clay Porch
VIMS Articles
Recent advances in methodology allow the history of the total mortality rate experienced by a population to be estimated from periodic (e.g., annual) observations on themean length of the population. This approach is generalized to allow data on several species that are caught together to be analyzed simultaneously based on the theory that changes in fishing effort are likely to affect several species; thus, the estimation of times when the mortality rate changes for one species borrows strength from data on other, concurrently caught species. Information theory can be used to select among models describing the degree of synchrony (if …
Estimates Of Sea Scallop (Placopecten Magellanicus) Incidental Mortality From Photographic Multiple Before-After-Control-Impact Surveys, Dm Ferraro, Ac Trembanis, Dc Mille, David Rudders
Estimates Of Sea Scallop (Placopecten Magellanicus) Incidental Mortality From Photographic Multiple Before-After-Control-Impact Surveys, Dm Ferraro, Ac Trembanis, Dc Mille, David Rudders
VIMS Articles
After several decades of stock decline, the Atlantic sea scallop ( Placopecten magellanicus) resource has rebounded to become one of the most valuable fisheries in the United States. The continued sustainability of this fishery is supported by catch limits determined by annual stock projection models. Incidental mortality is an important term in these projection models, but is historically difficult to measure. Current estimates are derived from field experiments that relied heavily on qualitative observations and as a result are based on limited data with low precision. To better quantify incidental mortality, a multiple before-after-control-impact experimental design was used to measure …
Development Of An Age-Frequency Distribution For Ocean Quahogs (Arctica Islandica) On Georges Bank, Sm Pace, En Powell, Roger L. Mann, M. Chase Long, John M. Klinck
Development Of An Age-Frequency Distribution For Ocean Quahogs (Arctica Islandica) On Georges Bank, Sm Pace, En Powell, Roger L. Mann, M. Chase Long, John M. Klinck
VIMS Articles
Ocean quahogs [Arctica islandica (Linnaeus, 1769)] are the longest-lived, noncolonial animal known today, with a maximum life span exceeding 500 y. Ocean quahogs are a commercially important bivalve, inhabiting the continental shelf of the North Atlantic Basin. Although considerable information exists on the growth and physiology of A. islandica, limited information is available regarding recruitment; accordingly, sustainably managing the fishery is a challenge. To investigate long-termrecruitment trends, the age of ocean quahogs fromGeorges Bank which were fully recruited to the commercial fishery (>80 mm shell length) was determined by analysis of annual growth lines in the hinge plate. Ages …