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- Research and Technical Reports (18)
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- Aquatic Health Sciences Peer-Reviewed Articles (7)
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- Alosa sapidissima (1)
- American Eel (1)
- American Shad (1)
- Anguilla rostrata (1)
- Animal behavior (1)
- Black sea bass · Acoustic telemetry · Dispersal · Fish habitat · Movement · Continental shelf · Negative binomial model (1)
- Blue-Crab; Parasitic Dinoflagellate; Ribosomal-Rna; Protistan Parasite; Perkinsus-Marinus; Alternate Hosts; Chesapeake Bay; Sp Alveolata; N-Sp; Crustaceans (1)
- Boundary-Layer; Polar; Bromine (1)
- Bycatch (1)
- C Nitrite Reductase; Benthic Metabolism; Mangrove Sediments; Inorganic Nitrogen; Terminos Lagoon; Fringing Marsh; Denitrification; Dynamics; Shallow; Estuary (1)
Articles 1 - 30 of 48
Full-Text Articles in Animal Sciences
Evaluation Of Striped Bass Stocks In Virginia, Monitoring And Tagging Studies, 2010-2014 Progress Report, 1 September 2012 - 31 August 2013, Philip W. Sadler, Matthew W. Smith, John M. Hoenig, Shelley E. Sullivan, Robert E. Harris, Lydia M. Goins
Evaluation Of Striped Bass Stocks In Virginia, Monitoring And Tagging Studies, 2010-2014 Progress Report, 1 September 2012 - 31 August 2013, Philip W. Sadler, Matthew W. Smith, John M. Hoenig, Shelley E. Sullivan, Robert E. Harris, Lydia M. Goins
Reports
This report presents the results of striped bass (Morone saxatilis) tagging and monitoring activities in Virginia during the period 1 September 2012 through 31 August 2013. It includes an assessment of the biological characteristics of striped bass taken from the 2013 spring spawning run, estimates of annual survival and fishing mortality based on annual spring tagging, and the results of the study that documents the prevalence of mycobacterial infections of striped bass in Chesapeake Bay. The information contained in this report is required by the Atlantic States Marine Fisheries Commission and is used to implement a coordinated management plan for …
Short Report: Gongylonema Pulchrum Infection In A Resident Of Williamsburg, Virginia, Verified By Genetic Analysis, Jonathan D. Allen, Aurora Esquela-Kerscher
Short Report: Gongylonema Pulchrum Infection In A Resident Of Williamsburg, Virginia, Verified By Genetic Analysis, Jonathan D. Allen, Aurora Esquela-Kerscher
Arts & Sciences Articles
We describe the thirteenth reported case of human infection with Gongylonema spp. in the United States and the first to be confirmed as Gongylonema pulchrum. The parasite described was isolated from the oral cavity of a resident of Williamsburg, Virginia. The identity of the parasite was verified through morphological and genetic approaches, and provided the first genetic confirmation of a Gongylonema sp. in humans.
Establishing Field-Based Evidence For The Effects Of Hypoxia On The Reproductive Capacity Of Chesapeake Bay Fishes., Troy D. Tuckey, Mary C. Fabrizio
Establishing Field-Based Evidence For The Effects Of Hypoxia On The Reproductive Capacity Of Chesapeake Bay Fishes., Troy D. Tuckey, Mary C. Fabrizio
Reports
No abstract provided.
Final Report An Inventory Of The Sea Scallop Resource In The Georges Bank Closed Area Ii And Surrounds, David Rudders, William D. Dupaul, Jessica Bergeron
Final Report An Inventory Of The Sea Scallop Resource In The Georges Bank Closed Area Ii And Surrounds, David Rudders, William D. Dupaul, Jessica Bergeron
Reports
No abstract provided.
Final Report An Assessment Of Sea Scallop Abundance And Distribution In A Selected Closed Area: Nantucket Lightship Closed Area, David Rudders, William D. Dupaul, Jessica Bergeron
Final Report An Assessment Of Sea Scallop Abundance And Distribution In A Selected Closed Area: Nantucket Lightship Closed Area, David Rudders, William D. Dupaul, Jessica Bergeron
Reports
No abstract provided.
Final Report An Assessment Of Sea Scallop Abundance And Distribution In Selected Areas: The Hudson Canyon And Delmarva Closed Area And Inshore Areas Of The New York Bight, David B. Rudders, William D. Dupaul, Jessica Bergeron
Final Report An Assessment Of Sea Scallop Abundance And Distribution In Selected Areas: The Hudson Canyon And Delmarva Closed Area And Inshore Areas Of The New York Bight, David B. Rudders, William D. Dupaul, Jessica Bergeron
Reports
No abstract provided.
2013 Annual Report Estimating Relative Juvenile Abundance Of Ecologically Important Finfish In The Virginia Portion Of Chesapeake Bay Project Number: F‐104‐R‐17, Troy D. Tuckey, Mary C. Fabrizio
2013 Annual Report Estimating Relative Juvenile Abundance Of Ecologically Important Finfish In The Virginia Portion Of Chesapeake Bay Project Number: F‐104‐R‐17, Troy D. Tuckey, Mary C. Fabrizio
Reports
No abstract provided.
Economic Activity Associated With Shellfish Aquaculture In Virginia – 2012, Thomas J. Murray, Karen Hudson
Economic Activity Associated With Shellfish Aquaculture In Virginia – 2012, Thomas J. Murray, Karen Hudson
Reports
No abstract provided.
Final Report Discrimination Of Cownose Ray, Rhinoptera Bonasus, Stocks Based On Microsatellite Dna Markers, Jan R. Mcdowell, Robert A. Fisher
Final Report Discrimination Of Cownose Ray, Rhinoptera Bonasus, Stocks Based On Microsatellite Dna Markers, Jan R. Mcdowell, Robert A. Fisher
Reports
No abstract provided.
Annual Report - 2012 Data Collection And Analysis In Support Of Single And Multispecies Stock Assessments In Chesapeake Bay:The Chesapeake Bay Multispecies Monitoring And Assessment Program, Christopher F. Bonzek, James Gartland, Debra J. Gauthier, Robert J. Latour
Annual Report - 2012 Data Collection And Analysis In Support Of Single And Multispecies Stock Assessments In Chesapeake Bay:The Chesapeake Bay Multispecies Monitoring And Assessment Program, Christopher F. Bonzek, James Gartland, Debra J. Gauthier, Robert J. Latour
Reports
Historically, fisheries management has been based on the results of single-species stock assessment models that focus on the interplay between exploitation level and sustainability. There currently exists a suite of standard and accepted analytical frameworks (e.g., virtual population analysis (VPA), biomass dynamic production modeling, delay difference models, etc.) for assessing the stocks, projecting future stock size, evaluating recovery schedules and rebuilding strategies for overfished stocks, setting allowable catches, and estimating fishing mortality or exploitation rates. A variety of methods also exist to integrate the biological system and the fisheries resource system, thereby enabling the evaluation of alternative management strategies on …
Virginia Game Fish Tagging Program Annual Report 2012, Susanna Musick, Lewis Gillingham
Virginia Game Fish Tagging Program Annual Report 2012, Susanna Musick, Lewis Gillingham
Reports
Through 2012, the Virginia Game Fish Tagging Program has maintained a 18-year database of records for tagged and recaptured fish. The program is a cooperative project of the Virginia Saltwater Fishing Tournament (under the Virginia Marine Resources Commission-VMRC) and the Virginia Institute of Marine Science (VIMS) of the College of William and Mary (under the VIMS Marine Advisory Program).
Monitoring Relative Abundance Of American Shad In Virginia Rivers 2012 Annual Report, Eric J. Hilton, Rob Latour, Brian Watkins, Ashleigh Magee
Monitoring Relative Abundance Of American Shad In Virginia Rivers 2012 Annual Report, Eric J. Hilton, Rob Latour, Brian Watkins, Ashleigh Magee
Reports
Concern about the decline in landings of American shad (Alosa sapidissima) along the Atlantic coast prompted the development of an interstate fisheries management plan (FMP) under the auspices of the Atlantic States Marine Fisheries Management Program (ASMFC 1999). Legislation enables imposition of federal sanctions on fishing in those states that fail to comply with the FMP. To be in compliance, coastal states are required to implement and maintain fishery-dependent and fishery-independent monitoring programs as specified by the FMP. For Virginia, these requirements include spawning stock assessments, the collection of biological data on the spawning run (e.g., age-structure, sex ratio, and …
Virginia Shellfish Aquaculture Situation And Outlook Report : Results Of The 2012 Virginia Shellfish Aquaculture Crop Reporting Survey, Thomas J. Murray, Karen Hudson
Virginia Shellfish Aquaculture Situation And Outlook Report : Results Of The 2012 Virginia Shellfish Aquaculture Crop Reporting Survey, Thomas J. Murray, Karen Hudson
Reports
The shellfish aquaculture industry in Virginia continues to grow, adding significant value to the state’s seafood marketplace. Today, watermen continue to harvest both hard clams and oysters from the state’s public resources, albeit at diminished rates. At the same time, Virginia’s watermen-farmers are providing growing quantities of additional quality shellfish to consumers. In recent years, folliowing the lead of the hard clam industry, a significant transition to intensive aquaculture of native oysters is underway. The once-extensive oyster planting utilizing wild seed has contracted primarily as a result of endemic oyster diseases and increasing wildlife predation of seed oysters. In its …
Northeast Area Monitoring And Assessment Program (Neamap) 2012 Data Collection And Analysis In Support Of Single And Multispecies Stock Assessments In The Mid-Atlantic: Northeast Area Monitoring And Assessment Program Near Shore Trawl Survey Final Report, Christopher F. Bonzek, James Gartland, Debra J. Gauthier, Robert J. Latour
Northeast Area Monitoring And Assessment Program (Neamap) 2012 Data Collection And Analysis In Support Of Single And Multispecies Stock Assessments In The Mid-Atlantic: Northeast Area Monitoring And Assessment Program Near Shore Trawl Survey Final Report, Christopher F. Bonzek, James Gartland, Debra J. Gauthier, Robert J. Latour
Reports
Concerns regarding the status of fishery-independent data collection from continental shelf waters between Cape Hatteras, North Carolina and the U.S. / Canadian border led the Atlantic States Marine Fisheries Commission’s (ASMFC) Management and Science Committee (MSC) to draft a resolution in 1997 calling for the formation of the Northeast Area Monitoring and Assessment Program (NEAMAP) (ASMFC 2002). NEAMAP is a cooperative state-federal program modeled after the Southeast Area Monitoring and Assessment Program (SEAMAP), which has been coordinating fishery-independent data collection south of Cape Hatteras since the mid1980s (Rester 2001). The four main goals of this new program directly address the …
Estimating Relative Abundance Of Young-Of-Year American Eel, Anguilla Rostrata, In The Virginia Tributaries Of Chesapeake Bay (Spring 2012), Troy D. Tuckey, Mary C. Fabrizio
Estimating Relative Abundance Of Young-Of-Year American Eel, Anguilla Rostrata, In The Virginia Tributaries Of Chesapeake Bay (Spring 2012), Troy D. Tuckey, Mary C. Fabrizio
Reports
The Atlantic States Marine Fisheries Commission (ASMFC) adopted the Interstate Fishery Management Plan (FMP) for the American Eel in November 1999. The FMP focuses on increasing coastal states’ efforts to collect American Eel data through both fishery-dependent and fishery-independent studies. Consequently, member jurisdictions agreed to implement an annual survey for young-of-year (YOY) American Eels. The survey is intended to “…characterize trends in annual recruitment of the YOY eels over time [to produce a] qualitative appraisal of the annual recruitment of American Eel to the U.S. Atlantic Coast” (ASMFC 2000). The development of these 4 surveys began in 2000 with full …
Evaluation Of Striped Bass Stocks In Virginia, Monitoring And Tagging Studies, 2010-2014 Progress Report, 1 September 2011 - 31 August 2012, Philip W. Sadler, Mathew W. Smith, John M. Hoenig, Shelley E. Sullivan, Robert E. Harris, Lydia M. Gions
Evaluation Of Striped Bass Stocks In Virginia, Monitoring And Tagging Studies, 2010-2014 Progress Report, 1 September 2011 - 31 August 2012, Philip W. Sadler, Mathew W. Smith, John M. Hoenig, Shelley E. Sullivan, Robert E. Harris, Lydia M. Gions
Reports
This report presents the results of striped bass (Morone saxatilis) tagging and monitoring activities in Virginia during the period 1 September 2011 through 31 August 2012. It includes an assessment of the biological characteristics of striped bass taken from the 2012 spring spawning run, estimates of annual survival and fishing mortality based on annual spring tagging, and the results of the study that documents the prevalence of mycobacterial infections of striped bass in Chesapeake Bay. The information contained in this report is required by the Atlantic States Marine Fisheries Commission and is used to implement a coordinated management plan for …
Indication Of Density-Dependent Changes In Growth And Maturity Of The Barndoor Skate On Georges Bank, Karson Coutre, Todd Gedamke, David Rudders, William B. Driggers Iii, David M. Koester, James A. Sulikowski
Indication Of Density-Dependent Changes In Growth And Maturity Of The Barndoor Skate On Georges Bank, Karson Coutre, Todd Gedamke, David Rudders, William B. Driggers Iii, David M. Koester, James A. Sulikowski
VIMS Articles
Drastic increases or decreases in biomass often result in density-dependent changes in life history characteristics within a fish population. Acknowledging this phenomenon and in light of the recent biomass increase in Barndoor Skate Dipturus laevis, the current study re-evaluated the growth rate and sexual maturity of 244 specimens collected from 2009-2011within closed areas I and II on Georges Bank, USA. Ages were estimated using vertebral band counts from skate that ranged from 21 to 129cm TL. The von Bertalanffy growth function was applied to pooled age-at-length data. Parameter estimates from the current study of L = 155cm TL and k …
Visual Acuity In Pelagic Fishes And Mollusks, Yl Gagnon, Tt Sutton, S Johnsen
Visual Acuity In Pelagic Fishes And Mollusks, Yl Gagnon, Tt Sutton, S Johnsen
VIMS Articles
In the sea, visual scenes change dramatically with depth. At shallow and moderate depths (<1000 >m), there is enough light for animals to see the surfaces and shapes of prey, predators, and conspecifics. This changes below 1000 m, where no downwelling daylight remains and the only source of light is bioluminescence. These different visual scenes require different visual adaptations and eye morphologies. In this study we investigate how the optical characteristics of animal lenses correlate with depth and ecology. We measured the radius, focal length, and optical quality of the lenses of pelagic fishes, cephalopods, and a gastropod using a …
Genetic Population Structure Of Us Atlantic Coastal Striped Bass (Morone Saxatilis), Dt Gauthier, Corinne Audemard, Jel Carlsson, Tl Darden, Mr Denson, Kimberly S. Reece, J Carlsson
Genetic Population Structure Of Us Atlantic Coastal Striped Bass (Morone Saxatilis), Dt Gauthier, Corinne Audemard, Jel Carlsson, Tl Darden, Mr Denson, Kimberly S. Reece, J Carlsson
VIMS Articles
Genetic population structure of anadromous striped bass along the US Atlantic coast was analyzed using 14 neutral nuclear DNA microsatellites. Young-of-the-year and adult striped bass (n = 1114) were sampled from Hudson River, Delaware River, Chesapeake Bay, North Carolina, and South Carolina. Analyses indicated clear population structure with significant genetic differentiation between all regions. Global multilocus F-ST was estimated at 0.028 (P < 0.001). Population structure followed an isolation-by-distance model and temporal sampling indicated a stable population structure more than 2 years at all locations. Significant structure was absent within Hudson River, whereas weak but significant genetic differences were observed between northern and southern samples in Chesapeake Bay. The largest and smallest effective striped bass population sizes were found in Chesapeake Bay and South Carolina, respectively. Coalescence analysis indicated that the highest historical gene flow has been between Chesapeake Bay and Hudson River populations, and that exchange has not been unidirectional. Bayesian analysis of contemporary migration indicated that Chesapeake Bay serves as a major source of migrants for Atlantic coastal regions from Albemarle Sound northward. In addition to examining population genetic structure, the data acquired during this project were capable of serving as a baseline for assigning fish with unknown origin to source region.
Denitrification And Nutrient Assimilation On A Restored Oyster Reef, M. Lisa Kellogg, Jeffery Cornwell, Michael S. Owens, Kennedy Paynter
Denitrification And Nutrient Assimilation On A Restored Oyster Reef, M. Lisa Kellogg, Jeffery Cornwell, Michael S. Owens, Kennedy Paynter
VIMS Articles
At a restored reef site and a control site in the Choptank River, Maryland, USA, we partially quantified the effect of oyster reef restoration on the removal of nutrients from the water column by determining seasonal fluxes of oxygen (O2), ammonium (NH4 +), combined nitrate and nitrite (NO2+ 3), di-nitrogen (N2) and soluble reactive phosphorus (SRP) and by assessing the assimilation of nutrients by macrofauna. Fluxes of O2, NH4 +, NO2+ 3 and SRP at the restored site were enhanced by at least one order of magnitude during all seasons. Seasonal denitrification rates at the restored site, measured as flux …
Patterns And Drivers Of The Demersal Fish Community Of Chesapeake Bay, Andre Buchheister, Christopher F. Bonzek, James Gartland, Robert J. Latour
Patterns And Drivers Of The Demersal Fish Community Of Chesapeake Bay, Andre Buchheister, Christopher F. Bonzek, James Gartland, Robert J. Latour
VIMS Articles
Large-scale research on the environmental, biological, and anthropogenic drivers of fish distributions, abundances, and community structure can identify patterns and trends within systems, provide mechanistic insight into ecosystem functioning, and contribute to ecosystembased fisheries management. This study synthesized 10 yr of extensive fisheries-independent bottom trawl data (2002 to 2011) to evaluate drivers of demersal fish community structure in Chesapeake Bay, the largest estuary in the United States. Changes in community composition were assessed using constrained correspondence analysis. Also, aggregate community metrics (species richness, Simpson diversity, and catch-per-unit-effort [CPUE] of species groups) were modeled using generalized additive models. Five species (Atlantic …
Habitat Associations And Dispersal Of Black Sea Bass From A Mid-Atlantic Bight Reef, Mary C. Fabrizio, John P. Manderson, Jeffrey P. Pessutti
Habitat Associations And Dispersal Of Black Sea Bass From A Mid-Atlantic Bight Reef, Mary C. Fabrizio, John P. Manderson, Jeffrey P. Pessutti
VIMS Articles
We examined habitat associations of 122 adult black sea bass Centropristis striata at a temperate reef off the coast of New Jersey, USA. The study site, located within the Historic Area Remediation Site, encompassed 46.1 km2 and included areas of rocky bottom and highly variable bathymetry. Factors influencing dispersal and habitat use were determined from acoustic tele - metry data collected between May and December 2003 from a grid of 72 moored receivers. About 2.7 times as many black sea bass used the site in summer as in fall. Fish were associated with relatively shallow, complex habitats characterized by previously …
Carbon Fluxes And Pelagic Ecosystem Dynamics Near Two Western Antarctic Peninsula Adélie Penguin Colonies: An Inverse Model Approach, Sevrine F. Sailley, Hugh W. Ducklow, Holly V. Moeller, William R. Fraser, Oscar M. Schofield, Deborah K. Steinberg, Lori M. Garzio, Scott C. Doney
Carbon Fluxes And Pelagic Ecosystem Dynamics Near Two Western Antarctic Peninsula Adélie Penguin Colonies: An Inverse Model Approach, Sevrine F. Sailley, Hugh W. Ducklow, Holly V. Moeller, William R. Fraser, Oscar M. Schofield, Deborah K. Steinberg, Lori M. Garzio, Scott C. Doney
VIMS Articles
An inverse food-web model for the western Antarctic Peninsula (WAP) pelagic food web was constrained with data from Palmer Long Term Ecological Research (PAL-LTER) project annual austral summer sampling cruises. Model solutions were generated for 2 regions with Adélie penguin Pygoscelis adeliae colonies presenting different population trends (a northern and a southern colony) for a 12 yr period (1995−2006). Counter to the standard paradigm, comparisons of carbon flow through bacteria, microzooplankton, and krill showed that the diatom−krill−top predator food chain is not the dominant pathway for organic carbon exchanges. The food web is more complex, including significant contributions by microzooplankton …
Revision Of The Genus Centrophorus (Squaliformes: Centrophoridae): Part 1-Redescription Of Centrophorus Granulosus (Bloch & Schneider), A Senior Synonym Of C-Acus Garman And C-Niaukang Teng, Wt White, Da Ebert, Gjp Naylor, Hc Ho, P Clerkin, A Verissimo, Cf Cotton
Revision Of The Genus Centrophorus (Squaliformes: Centrophoridae): Part 1-Redescription Of Centrophorus Granulosus (Bloch & Schneider), A Senior Synonym Of C-Acus Garman And C-Niaukang Teng, Wt White, Da Ebert, Gjp Naylor, Hc Ho, P Clerkin, A Verissimo, Cf Cotton
VIMS Articles
The genus Centrophorus is one of the most taxonomically complex and confusing elasmobranch groups. A revision of this group is currently underway and this first paper sets an important foundation in this process by redescribing the type species of the genus-Centrophorus granulosus. This taxon name has been previously applied to two different morphotypes: a large species > 1.5 m TL and a smaller species similar to 1 m TL. Centrophorus acus and C. niaukang are the most commonly used names applied to the larger morphotype. The original description of C. granulosus was based on a large specimen of similar to 1.5 …
Using Timescales To Interpret Dissolved Oxygen Distributions In The Bottom Waters Of Chesapeake Bay, Jian Shen, B Hong, Ay Kuo
Using Timescales To Interpret Dissolved Oxygen Distributions In The Bottom Waters Of Chesapeake Bay, Jian Shen, B Hong, Ay Kuo
VIMS Articles
A simplified conceptual model based on timescales of gravitational circulation, vertical exchange, and total oxygen consumption rate of the biochemical processes is presented to provide insight into the relationships between estuarine dynamics and bottom water dissolved oxygen (DO). Two dimensionless parameters are introduced to diagnose the relationship between the vertical exchange process and the biochemical DO consumption and the influence of gravitational circulation on replenishment of bottom DO. The relative magnitudes of these timescales provide a linkage between the physical and biochemical processes. The hypoxic and anoxic conditions in deep waters of Chesapeake Bay are successfully interpreted with these three …
Haplosporidium Littoralis Sp Nov.: A Crustacean Pathogen Within The Haplosporida (Cercozoa, Ascetosporea), Gd Stentiford, Ks Bateman, Na Stokes, Ryan Carnegie
Haplosporidium Littoralis Sp Nov.: A Crustacean Pathogen Within The Haplosporida (Cercozoa, Ascetosporea), Gd Stentiford, Ks Bateman, Na Stokes, Ryan Carnegie
VIMS Articles
Previously, we described the pathology and ultrastructure of an apparently asporous haplosporidian-like parasite infecting the common shore crab Carcinus maenas from the European shoreline. In the current study, extraction of genomic DNA from the haemolymph, gill or hepatopancreas of infected C. maenas was carried out and the small subunit ribosomal DNA (SSU rDNA) of the pathogen was amplified by PCR before cloning and sequencing. All 4 crabs yielded an identical 1736 bp parasite sequence. BLAST analysis against the NCBI GenBank database identified the sequence as most similar to the protistan pathogen group comprising the order Haplosporida within the class Ascetosporea …
Penguin Biogeography Along The West Antarctic Peninsula Testing The Canyon Hypothesis With Palmer Lter Observations, O Schofield, H Ducklow, K Bernard, S Doney, D Patterson-Fraser, Et Al.
Penguin Biogeography Along The West Antarctic Peninsula Testing The Canyon Hypothesis With Palmer Lter Observations, O Schofield, H Ducklow, K Bernard, S Doney, D Patterson-Fraser, Et Al.
VIMS Articles
No abstract provided.
Contribution Of Sea Ice In The Southern Ocean To The Cycling Of Volatile Halogenated Organic Compounds, A Granfors, A Karlsson, E Mattsson, Walker O. Smith Jr., K Abrahamsson
Contribution Of Sea Ice In The Southern Ocean To The Cycling Of Volatile Halogenated Organic Compounds, A Granfors, A Karlsson, E Mattsson, Walker O. Smith Jr., K Abrahamsson
VIMS Articles
The contribution of sea ice to the flux of biogenic volatile halogenated organic compounds to the atmosphere in the Southern Ocean is currently not known. To approach this question, we measured halocarbons in sea ice, sea ice brine, and surface water of the Amundsen and Ross Seas. Concentrations in sea ice of these compounds, normalized to seawater salinity, ranged from 0.2 to 810 pmol L-1. Salinity-normalized chlorophyll a concentrations in the ice ranged from 3.5 to 190 mu gL(-1). Our results suggest biological production of halocarbons in sea ice, with maxima of halogenated organics and chlorophyll a commonly found in …
Krill Biomass And Aggregation Structure In Relation To Tidal Cycle In A Penguin Foraging Region Off The Western Antarctic Peninsula, Ks Bernard, Deborah K. Steinberg
Krill Biomass And Aggregation Structure In Relation To Tidal Cycle In A Penguin Foraging Region Off The Western Antarctic Peninsula, Ks Bernard, Deborah K. Steinberg
VIMS Articles
Antarctic krill are a key component of the diet of Adlie penguins inhabiting the Western Antarctic Peninsula (WAP), yet our understanding of the variability of krill distribution patterns within nearshore penguin feeding grounds is limited. A recent study of the foraging patterns of penguins breeding in the northern WAP suggests that tidal phase plays a role in foraging distance. We used acoustics to examine biomass and aggregation structure of krill in the penguin foraging grounds off Palmer Station during diurnal and semi-diurnal tides. Nearshore, integrated krill biomass during diurnal tides was significantly higher than during semi-diurnal tides. Krill aggregations were …
Effects Of Microalgal Exudates And Intact Cells On Subtropical Marine Zooplankton, Nj Silva, Kw Tang, Rm Lopes
Effects Of Microalgal Exudates And Intact Cells On Subtropical Marine Zooplankton, Nj Silva, Kw Tang, Rm Lopes
VIMS Articles
Harmful algal blooms (HABs) affect coastal waters worldwide and very often lead to the disruption of seafood harvesting and commercial activities, because of potential hazards to human health associated with the consumption of contaminated mussels, crustaceans and fish. HAB events are frequently caused by outbreaks of toxin-producing dinoflagellates, which are subject to top-down control by zooplankton. The aim of this study was to analyze the effects of dinoflagellate exudates and intact cells on the survivorship and mobility of zooplankton taxa from a subtropical location (Ubatuba, Brazil). Lethal effects were observed in five out of six taxa investigated, three of which …