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Articles 1 - 30 of 142
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 …
A Communal Catalogue Reveals Earth’S Multiscale Microbial Diversity, L R. Thompson, Daniel A. Cristol
A Communal Catalogue Reveals Earth’S Multiscale Microbial Diversity, L R. Thompson, Daniel A. Cristol
Arts & Sciences Articles
No abstract provided.
A Communal Catalogue Reveals Earth’S Multiscale Microbial Diversity, Luke R. Thompson, Jon G. Saunders, Et Al, Earth Microbiome Project Consortium, Donglai Gong
A Communal Catalogue Reveals Earth’S Multiscale Microbial Diversity, Luke R. Thompson, Jon G. Saunders, Et Al, Earth Microbiome Project Consortium, Donglai Gong
VIMS Articles
Our growing awareness of the microbial world's importance and diversity contrasts starkly with our limited understanding of its fundamental structure. Despite recent advances in DNA sequencing, a lack of standardized protocols and common analytical frameworks impedes comparisons among studies, hindering the development of global inferences about microbial life on Earth. Here we present a meta-analysis of microbial community samples collected by hundreds of researchers for the Earth Microbiome Project. Coordinated protocols and new analytical methods, particularly the use of exact sequences instead of clustered operational taxonomic units, enable bacterial and archaeal ribosomal RNA gene sequences to be followed across multiple …
Evaluation Of Striped Bass Stocks In Virginia: Monitoring And Tagging Studies, 2015-2019 Progress Report 1 September 2016 - 31 November 2017, Philip W. Sadler, Lydia M. Goins, John M. Hoenig, Savannah Michaelsen, Maya L. Groner, Robert E. Harris
Evaluation Of Striped Bass Stocks In Virginia: Monitoring And Tagging Studies, 2015-2019 Progress Report 1 September 2016 - 31 November 2017, Philip W. Sadler, Lydia M. Goins, John M. Hoenig, Savannah Michaelsen, Maya L. Groner, Robert E. Harris
Reports
This report presents the results of striped bass (Morone saxatilis) tagging and monitoring activities in Virginia during the period 1 September 2016 through 31 August 2017. It includes an assessment of the biological characteristics of striped bass taken from the 2017 spring spawning run and estimates of annual survival and fishing mortality based on annual spring tagging. Also included is an investigation on the potential use of close-kin analyses to determine the size of the spawning stock in the Rappahannock River and an evaluation of mortality rates associated with the bacterial dermal disease mycobacteriosis in relation to water …
Performance Of A Low-Cost, Solar-Powered Pop-Up Satellite Archival Tag For Assessing Post-Release Mortality Of Atlantic Bluefin Tuna (Thunnus Thynnus) Caught In The Us East Coast Light-Tackle Recreational Fishery, William M. Goldsmith, Andrew M. Scheld, John Graves
Performance Of A Low-Cost, Solar-Powered Pop-Up Satellite Archival Tag For Assessing Post-Release Mortality Of Atlantic Bluefin Tuna (Thunnus Thynnus) Caught In The Us East Coast Light-Tackle Recreational Fishery, William M. Goldsmith, Andrew M. Scheld, John Graves
VIMS Articles
Pop-up satellite archival tags (PSATs) are a valuable tool for estimating mortality of pelagic fishes released from commercial and recreational fishing gears. However, the high cost of PSATs limits sample sizes, resulting in low-precision post-release mortality estimates with little management applicability. We evaluate the performance of a lower-cost PSAT designed to enable large-scale post-release mortality studies. The tag uses solar rather than battery power, does not include a depth sensor, and transmits daily summaries of light and temperature data rather than high-resolution habitat profiles, contributing to a substantially lower per-unit price. We assessed the tag’s ability to detect mortality while …
Identifying Critical Recruitment Bottlenecks Limiting Seedling Establishment In A Degraded Seagrass Ecosystem, J Statton, Lr Montoya, R J. Orth, Kw Dixon, Ga Kendrick
Identifying Critical Recruitment Bottlenecks Limiting Seedling Establishment In A Degraded Seagrass Ecosystem, J Statton, Lr Montoya, R J. Orth, Kw Dixon, Ga Kendrick
VIMS Articles
Identifying early life-stage transitions limiting seagrass recruitment could improve our ability to target demographic processes most responsive to management. Here we determine the magnitude of life-stage transitions along gradients in physical disturbance limiting seedling establishment for the marine angiosperm, Posidonia australis. Transition matrix models and sensitivity analyses were used to identify which transitions were critical for successful seedling establishment during the first year of seed recruitment and projection models were used to predict the most appropriate environments and seeding densities. Total survival probability of seedlings was low (0.001), however, transition probabilities between life-stages differed across the environmental gradients; seedling recruitment …
Reef Height Drives Threshold Dynamics Of Restored Oyster Reefs, Allison M. Colden, Robert J. Latour, Rom Lipcius
Reef Height Drives Threshold Dynamics Of Restored Oyster Reefs, Allison M. Colden, Robert J. Latour, Rom Lipcius
VIMS Articles
Nonlinear threshold responses to biotic or abiotic forcing may produce multiple population trajectories dependent upon initial conditions, which can reinforce population recovery or drive local ex - tinction, yet experimental tests of this phenomenon are lacking in marine ecosystems. In field experiments at 4 sites in 2 tributaries of lower Chesapeake Bay, we examined demographic responses (density and survival) of eastern oyster Crassostrea virginica populations to reef height and associated gradients in sediment deposition and habitat complexity. After 2 yr, oyster reefs exhibited diverging trajectories to ward either degradation or persistence, dependent upon initial reef height. Reefs higher than 0.3 …
Collection Techniques For The Analyses Of Pathogens In Crustaceans, Jeffrey D. Shields
Collection Techniques For The Analyses Of Pathogens In Crustaceans, Jeffrey D. Shields
VIMS Articles
Outbreaks of diseases have been reported from a number of ecologically or commercially important crustaceans in tropical, temperature, and boreal waters. The etiology of a disease is often unknown prior to these outbreaks and the effect of the pathogen on the host population is poorly understood. Various techniques can be used to collect, identify, and monitor host populations for pathogens. These include classical methods, such as visual or histological assessment, to more refined techniques, such as simple and quantitative polymerase chain reaction assays. The strengths and weaknesses of the different methods are presented as well as some general guidelines for …
A Brief Guide To Striped Bass Ecology & Management In Chesapeake Bay, Mary C. Fabrizio, Troy D. Tuckey, Susanna Musick
A Brief Guide To Striped Bass Ecology & Management In Chesapeake Bay, Mary C. Fabrizio, Troy D. Tuckey, Susanna Musick
Reports
Chesapeake Bay striped bass support important recreational fisheries along the US Atlantic coast; in the late 1970s, the population of striped bass collapsed as a result of overfishing and poor water quality in rivers used for spawning and rear-ing of young. Informed by stock assessments, strict management regulations were enacted in the mid-1980s and early 1990s; these highly effective regulations resulted in the recovery of the population in 1995. A key to the successful recov-ery of the Atlantic coast striped bass was the wide range of ages of spawning females and the associated differences in spawning behavior among ages. Age …
Integration Of Swimming Kinematics And Ram Suspension Feeding In A Model American Paddlefish, Polyodon Spathula, Grant Emerson Haines, S. Laurie Sanderson
Integration Of Swimming Kinematics And Ram Suspension Feeding In A Model American Paddlefish, Polyodon Spathula, Grant Emerson Haines, S. Laurie Sanderson
Arts & Sciences Articles
Ram suspension-feeding fishes swim with an open mouth to force water through the oral cavity and extract prey items that are too small to be pursued individually. Recent research has indicated that, rather than using a dead-end mechanical sieve, American paddlefish (Polyodon spathula) employ vortical cross-step filtration. In this filtration mechanism, vortical flow that is generated posterior to the branchial arches organizes crossflow filtration processes into a spatial structure across the gill rakers. Despite the known impact of locomotor kinematics on fluid flow around the bodies of swimming fish, the effects of locomotor kinematics on filtration mechanisms in …
Bottom-Up Control Of Parasites, David S. Johnson, Richard Heard
Bottom-Up Control Of Parasites, David S. Johnson, Richard Heard
VIMS Articles
Parasitism is a fundamental ecological interaction. Yet we understand relatively little about the ecological role of parasites compared to the role of free-living organisms. Bottom-up theory predicts that resource enhancement will increase the abundance and biomass of free-living organisms. Similarly, parasite abundance and biomass should increase in an ecosystem with resource enhancement. We tested this hypothesis in a landscape-level experiment in which salt marshes (60,000 m2 each) received elevated nutrient concentrations via flooding tidal waters for 11 yr to mimic eutrophication. Nutrient enrichment elevated the densities of the talitrid amphipod, Orchestia grillus, and the density and biomass of its …
Results For The 2017 Vims Industry Cooperative Surveys Of The Mid-Atlantic, Nantucket Lightship Closed Area, And Closed Area Ii Resource Areas, David Rudders, Sally Roman, Hunter Tipton, Jennifer Anders
Results For The 2017 Vims Industry Cooperative Surveys Of The Mid-Atlantic, Nantucket Lightship Closed Area, And Closed Area Ii Resource Areas, David Rudders, Sally Roman, Hunter Tipton, Jennifer Anders
Reports
The Virginia Institute of Marine Science (VIMS) conducted high resolution sea scallop dredge surveys of the entire Mid-Atlantic (MAB) sea scallop resource area, the Nantucket Lightship (NLCA) access area and surrounds, and the CA II access area and Extension Closure during May-July of 2017 (Figure 1). These surveys were funded by the Sea Scallop Research Set-Aside Program (RSA). Exploitable biomass for each survey is shown in Table 1 for each spatially explicit SAMS (Scallop Area Management Simulator) model area (Figure 2-4). SAMS areas account for differences in recruitment, vital rates, and fishing effort. At the time of the surveys, exploitable …
Exposure Of Bald Eagle Nestlings To Contaminants On National Park Service Lands Within The Chesapeake Bay, Interim Report: Fall 2017, B. D. Watts, B. J. Paxton, M. L. Pitts
Exposure Of Bald Eagle Nestlings To Contaminants On National Park Service Lands Within The Chesapeake Bay, Interim Report: Fall 2017, B. D. Watts, B. J. Paxton, M. L. Pitts
CCB Technical Reports
No abstract provided.
Impact Of Disease On The Survival Of Three Commercially Fished Species, John M. Hoenig, Maya L. Groner, Matthew W. Smith, Wolfgang K. Vogelbein, David M. Taylor, Donald F. Landers, John T. Swenarton, David T. Gauthier, Philip W. Sadler, Mark A. Matsche, Ashley N. Haines, Hamish J. Small, Roger Pradel, Remi Choquet, Jeffrey D. Shields
Impact Of Disease On The Survival Of Three Commercially Fished Species, John M. Hoenig, Maya L. Groner, Matthew W. Smith, Wolfgang K. Vogelbein, David M. Taylor, Donald F. Landers, John T. Swenarton, David T. Gauthier, Philip W. Sadler, Mark A. Matsche, Ashley N. Haines, Hamish J. Small, Roger Pradel, Remi Choquet, Jeffrey D. Shields
VIMS Articles
Recent increases in emergent infectious diseases have raised concerns about the sustainability of some marine species. The complexity and expense of studying diseases in marine systems often dictate that conservation and management decisions are made without quantitative data on population-level impacts of disease. Mark-recapture is a powerful, underutilized, tool for calculating impacts of disease on population size and structure, even in the absence of etiological information. We applied logistic regression models to mark-recapture data to obtain estimates of disease-associated mortality rates in three commercially important marine species: snow crab (Chionoecetes opilio) in Newfoundland, Canada, that experience sporadic epizootics of bitter …
Community Interactions And Density Dependence In The Southeast United States Coastal Shark Complex, Cassidy D. Peterson, Kristene D. Parsons, Dana M. Bethea, William B. Driggers Iii, Robert J. Latour
Community Interactions And Density Dependence In The Southeast United States Coastal Shark Complex, Cassidy D. Peterson, Kristene D. Parsons, Dana M. Bethea, William B. Driggers Iii, Robert J. Latour
VIMS Articles
Studies aiming to assess intra- and interspecies community relationships in marine habitats are typically limited to accessible, nearshore areas of restricted temporal and spatial scale, within which only segments of the populations of interest are available. Using multivariate first-order auto regressive state-space (MARSS-1) models, we estimated measures of interspecies interactions and density dependence of 7 Atlantic coastal shark species (4 large and 3 small coastal sharks) at 2 spatial scales. Localized analyses were based on data from 4 relatively spatially limited, fishery-independent surveys conducted along the southeast US Atlantic coast and within the Gulf of Mexico. We then compared these …
Spatiotemporal Trends And Drivers Of Fish Condition In Chesapeake Bay, Robert J. Latour, James Gartland, Christopher F. Bonzek
Spatiotemporal Trends And Drivers Of Fish Condition In Chesapeake Bay, Robert J. Latour, James Gartland, Christopher F. Bonzek
VIMS Articles
Measures of condition in fishes are often used to assess the general well-being of fish populations since condition reflects the biotic and abiotic factors experienced by individuals over moderate time scales. Fish condition can also be used as an indicator of ecosystem suitability in the context of ecosystem-based management. From an ecosystem perspective, evaluation of fish condition is best described over multiple spatiotemporal scales and in a multi-species context. This study analyzed 14 yr (2002-2015) of fisheries-independent trawl survey data to evaluate trends in condition for 16 demersal fishes inhabiting Chesapeake Bay, the largest estuary in the USA. Seasonal and …
Subgenome Dominance In An Interspecific Hybrid, Synthetic Allopolyploid, And A 140-Year-Old Naturally Established Neo-Allopolyploid Monkeyflower, Patrick P. Edger, Ronald Smith, Micheal R. Mckain, (...), Gregory D. Conradi Smith, Joshua R. Puzey
Subgenome Dominance In An Interspecific Hybrid, Synthetic Allopolyploid, And A 140-Year-Old Naturally Established Neo-Allopolyploid Monkeyflower, Patrick P. Edger, Ronald Smith, Micheal R. Mckain, (...), Gregory D. Conradi Smith, Joshua R. Puzey
Arts & Sciences Articles
Recent studies have shown that one of the parental subgenomes in ancient polyploids is generally more dominant, having retained more genes and being more highly expressed, a phenomenon termed subgenome dominance. The genomic features that determine how quickly and which subgenome dominates within a newly formed polyploid remain poorly understood. To investigate the rate of emergence of subgenome dominance, we examined gene expression, gene methylation, and transposable element (TE) methylation in a natural, <140-year-old allopolyploid (Mimulus peregrinus), a resynthesized interspecies triploid hybrid (M. robertsii), a resynthesized allopolyploid (M. peregrinus), and progenitor species (M. guttatus …
Sea Level Rise May Increase Extinction Risk Of A Saltmarsh Ontogenetic Habitat Specialist, David S. Johnson, Bethany L. Williams
Sea Level Rise May Increase Extinction Risk Of A Saltmarsh Ontogenetic Habitat Specialist, David S. Johnson, Bethany L. Williams
VIMS Articles
Specialist species are more vulnerable to environmental change than generalist species. For species with ontogenetic niche shifts, specialization may occur at a particular life stage making those stages more susceptible to environmental change. In the salt marshes in the northeast U.S., accelerated sea level rise is shifting vegetation patterns from flood-intolerant species such as Spartina patens to the flood-tolerant Spartina alterniflora. We tested the potential impact of this change on the coffee bean snail, Melampus bidentatus, a numerically dominant benthic invertebrate with an ontogenetic niche shift. From a survey of eight marshes throughout the northeast U.S., small snails …
Tidal Habitats Support Large Numbers Of Invasive Blue Catfish In A Chesapeake Bay Subestuary, Troy D. Tuckey, Mary C. Fabrizio, Robert J. Latour, Alicia J. Norris, Gary C. White
Tidal Habitats Support Large Numbers Of Invasive Blue Catfish In A Chesapeake Bay Subestuary, Troy D. Tuckey, Mary C. Fabrizio, Robert J. Latour, Alicia J. Norris, Gary C. White
VIMS Articles
The introduction of a non-native freshwater fish, blue catfish Ictalurus furcatus, in tributaries of Chesapeake Bay resulted in the establishment of fisheries and in the expansion of the population into brackish habitats. Blue catfish are an invasive species in the Chesapeake Bay region, and efforts are underway to limit their impacts on native communities. Key characteristics of the population (population size, survival rates) are unknown, but such knowledge is useful in understanding the impact of blue catfish in estuarine systems. We estimated population size and survival rates of blue catfish in tidal habitats of the James River subestuary. We tagged …
Fate Mapping Neurons And Glia Derived From Dbx1-Expressing Progenitors In Mouse Prebotzinger Complex, Andrew Kottick, Caroline A. Martin, Christopher A. Del Negro
Fate Mapping Neurons And Glia Derived From Dbx1-Expressing Progenitors In Mouse Prebotzinger Complex, Andrew Kottick, Caroline A. Martin, Christopher A. Del Negro
Arts & Sciences Articles
The brainstem preBotzinger complex (preBotC) generates the inspiratory breathing rhythm, and its core rhythmogenic interneurons are derived from Dbx1-expressing progenitors. To study the neural bases of breathing, tamoxifen-inducible Cre-driver mice and Cre-dependent reporters are used to identify, record, and perturb Dbx1 preBotC neurons. However, the relationship between tamoxifen administration and reporter protein expression in preBotC neurons and glia has not been quantified. To address this problem, we crossed mice that express tamoxifen-inducible Cre recombinase under the control of the Dbx1 gene (Dbx1(CreERT2)) with Cre-dependent fluorescent reporter mice (Rosa26(tdTomato)), administered tamoxifen at different times during development, and analyzed tdTomato expression in …
Understanding Changes In Seagrass Communities, Sarah Nuss, Celeste Venolia
Understanding Changes In Seagrass Communities, Sarah Nuss, Celeste Venolia
VIMS Articles
Seagrass is an incredibly valuable habitat in the Chesapeake Bay. Students will use mock seagrass patches, modeled after a research transect along Goodwin Island, Virginia, to analyze change in seagrass percent cover during, and following, a major die-off event in 2010. Students also analyze water quality graphs from the same time period to help them determine why the die-off may have occurred.
Mapping Bald Eagle Activity Shadows Around Communal Roosts, B. D. Watts, Courtney Turrin
Mapping Bald Eagle Activity Shadows Around Communal Roosts, B. D. Watts, Courtney Turrin
Arts & Sciences Articles
We assessed diurnal activity patterns associated with communal roosts (n = 26) by tracking nonbreeding bald eagles (Haliaeetus leucocephalus; n = 58) within the upper Chesapeake Bay, USA, 2008-2013. We used daytime locations (n = 54,165) to map activity shadows (using home range analytics, 90% kernel) around communal roosts, to evaluate the spatial structure and to delineate diurnal activity centers. We overlaid a range (100-3,200 m) of buffers around the perimeter of each roost to estimate the benefits of management scenarios in extending protection to daytime activities. Activity shadows around roosts varied from 1.5 km(2) to 116 km(2) ((x) over …
Correlation Between Investment In Sexual Traits And Valve Sexual Dimorphism In Cyprideis Species (Ostracoda), Maria João Fernandes Martins, Gene Hunt, Rowan Lockwood, John P. Swaddle, David J. Horne
Correlation Between Investment In Sexual Traits And Valve Sexual Dimorphism In Cyprideis Species (Ostracoda), Maria João Fernandes Martins, Gene Hunt, Rowan Lockwood, John P. Swaddle, David J. Horne
Arts & Sciences Articles
Assessing the long-term macroevolutionary consequences of sexual selection has been hampered by the difficulty of studying this process in the fossil record. Cytheroid ostracodes offer an excellent system to explore sexual selection in the fossil record because their readily fossilized carapaces are sexually dimorphic. Specifically, males are relatively more elongate than females in this superfamily. This sexual shape difference is thought to arise so that males carapaces can accommodate their very large copulatory apparatus, which can account for up to one-third of body volume. Here we test this widely held explanation for sexual dimorphism in cytheroid ostracodes by correlating investment …
Development And Implementation Of A High Precision Resource Wide Dredge Survey Of The Mid-Atlantic Scallop Resource Are: Final Report, David Rudders, Sally Roman
Development And Implementation Of A High Precision Resource Wide Dredge Survey Of The Mid-Atlantic Scallop Resource Are: Final Report, David Rudders, Sally Roman
Reports
The sea scallop fishery is currently the most valuable single species fishery in the United States. Part of this success stems from a hybrid management strategy that incorporates a spatial component (rotational closed areas) with traditional fishery management approaches. While much recent attention has focused on the success of closed areas (e.g. Elephant Trunk Closed Area), production from open areas had enabled scallop landings to remain high and relatively stable over the past few years. Regardless of the management approach, timely and accurate information related to scallop distribution and biomass is critical for the effective management of the resource. This …
New Insight Into The Transmission Dynamics Of The Crustacean Pathogen Hematodinium Perezi (Dinoflagellata) Using A Novel Sentinel Methodology, Jeffrey D. Shields, Juan Pablo Huchin-Mian Huchin-Mian, Pattie A. O’Leary, Hamish J. Small
New Insight Into The Transmission Dynamics Of The Crustacean Pathogen Hematodinium Perezi (Dinoflagellata) Using A Novel Sentinel Methodology, Jeffrey D. Shields, Juan Pablo Huchin-Mian Huchin-Mian, Pattie A. O’Leary, Hamish J. Small
VIMS Articles
Hematodinium perezi causes disease and mortality in several decapod crustaceans along the eastern seaboard and Gulf coast of the USA. The route of transmission of the parasite is unknown, but infections exhibit a sharp seasonal cycle in its primary host, the blue crab Callinectes sapidus, that indicates the possibility of a short transmission period in its life cycle. We developed a sentinel methodology based on the use of naïve, uninfected, early benthic juvenile crabs (instars C1 to C10) to investigate the transmission of H. perezi. Crabs were collected from a non-endemic site, held for a short period for evaluation, and …
Submersed Aquatic Vegetation In Chesapeake Bay: Sentinel Species In A Changing World, R J. Orth, William C. Dennison, Jonathan S. Lefcheck, Cassie Gurbisz, Michael Hannam, Jennifer Keisman, J. Brooke Landry, Ken Moore, Rebecca R. Murphy, Christopher J. Patrick, Jeremy Testa, Donald E. Weller, David J. Wilcox
Submersed Aquatic Vegetation In Chesapeake Bay: Sentinel Species In A Changing World, R J. Orth, William C. Dennison, Jonathan S. Lefcheck, Cassie Gurbisz, Michael Hannam, Jennifer Keisman, J. Brooke Landry, Ken Moore, Rebecca R. Murphy, Christopher J. Patrick, Jeremy Testa, Donald E. Weller, David J. Wilcox
VIMS Articles
Chesapeake Bay has undergone profound changes since European settlement. Increases in human and livestock populations, associated changes in land use, increases in nutrient loadings, shoreline armoring, and depletion of fish stocks have altered the important habitats within the Bay. Submersed aquatic vegetation (SAV) is a critical foundational habitat and provides numerous benefits and services to society. In Chesapeake Bay, SAV species are also indicators of environmental change because of their sensitivity to water quality and shoreline development. As such, SAV has been deeply integrated into regional regulations and annual assessments of management outcomes, restoration efforts, the scientific literature, and popular …
Discard Mortality Of Sea Scallops Following Capture And Handling In The Sea Scallop Dredge Fishery - Final Report, David Rudders, Sally Roman, James A. Sulikowski, John A. Mandlem, Ryan J. Knotek
Discard Mortality Of Sea Scallops Following Capture And Handling In The Sea Scallop Dredge Fishery - Final Report, David Rudders, Sally Roman, James A. Sulikowski, John A. Mandlem, Ryan J. Knotek
Reports
The focus of sea scallop, Placopecten magellanicus, management over the past 20 years has been to encourage the harvest of larger animals. This has been accomplished through a series of management measures including gear modifications, effort controls, crew size limitations and spatial management to protect juvenile scallops. While these measures have been effective in reducing the harvest of small scallops, their capture does still occur. Central to fully understanding the impact of the fishery on the resource, is a comprehensive estimate of the non-harvest mortality associated with commercial operations. Non-harvest mortality can be broken down into a number of different …
History Of The Virginia Oyster Fishery, Chesapeake Bay, Usa, David M. Schulte
History Of The Virginia Oyster Fishery, Chesapeake Bay, Usa, David M. Schulte
VIMS Articles
Oyster populations in Virginia's waters of Chesapeake Bay were lightly exploited until the early 1800s, when industrial fishery vessels first arrived, driven south from New England due to the collapse of northeastern oyster fisheries. Early signs of overexploitation and habitat degradation were evident by the 1850s. The public fishery, where oyster fishers harvest on state-owned bottom, rapidly developed after the Civil War and peaked in the early 1880s. Declines were noted by the late 1880s and eventually prompted the creation of Virginia's shell-planting and oyster-seed (young-of-the-year, YOY) moving repletion program in the 1920s. Despite management and increasing repletion efforts, the …
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 …
Multifaceted Biodiversity Hotspots Of Marine Mammals For Conservation Priorities, Camille Albouy, Valentine L. Delattre, Bastien Merigot, Christine N. Meynard, Fabien Leprieur
Multifaceted Biodiversity Hotspots Of Marine Mammals For Conservation Priorities, Camille Albouy, Valentine L. Delattre, Bastien Merigot, Christine N. Meynard, Fabien Leprieur
VIMS Articles
Aim: Identifying the multifaceted biodiversity hotspots for marine mammals and their spatial overlap with human threats at the global scale.