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Full-Text Articles in Animal Sciences
Evaluating Optimal Removal Of Derelict Blue Crab Pots In Virginia, Us, Andrew M. Scheld, Donna M. Bilkovic, Kirk J. Havens
Evaluating Optimal Removal Of Derelict Blue Crab Pots In Virginia, Us, Andrew M. Scheld, Donna M. Bilkovic, Kirk J. Havens
VIMS Articles
Derelict fishing gear is a growing concern in many fisheries and coastal communities. Pots and traps are prevalent forms of derelict fishing gear with numerous documented harmful effects. In the Chesapeake Bay, US, a large blue crab (Callinectes sapidus) pot fishery produces high levels of derelict gear. From 2008 to 2014, 34,408 derelict pots were removed from blue crab fishing areas in Virginia. This research first evaluates whether observed increases in catch rates occurring contemporaneously with the removal program were the result of derelict gear removals. An econometric production model is then used to estimate marginal removal benefits …
Examining Derelict Pot Impacts On Harvest In A Commercial Blue Crab Callinectes Sapidus Fishery, James A. Delbene, Donna M. Bilkovic, Andrew M. Scheld
Examining Derelict Pot Impacts On Harvest In A Commercial Blue Crab Callinectes Sapidus Fishery, James A. Delbene, Donna M. Bilkovic, Andrew M. Scheld
VIMS Articles
Pot fisheries occur worldwide with a significant proportion of the gear becoming derelict. Derelict pots induce detrimental ecological and economic impacts, and more recently were found to reduce blue crab harvests in the Chesapeake Bay commercial fishery. We simulated the presence of derelict pots near actively fished pots in seasonal field experiments to quantify the effect derelict pots have on blue crab harvest. Derelict pots reduced harvests by 30% during the summer, but not during the fall. Female blue crab capture rates were consistently lower when derelict pots were present; while capture rates of the less abundant males were not …
New Constraints On Coseismic Slip During Southern Cascadia Subduction Zone Earthquakes Over The Past 4600 Years Implied By Tsunami Deposits And Marine Turbidites, Gr Priest, Rc Witter, Yinglong J. Zhang, C Goldfinger, Kl Wang, Jc Allen
New Constraints On Coseismic Slip During Southern Cascadia Subduction Zone Earthquakes Over The Past 4600 Years Implied By Tsunami Deposits And Marine Turbidites, Gr Priest, Rc Witter, Yinglong J. Zhang, C Goldfinger, Kl Wang, Jc Allen
VIMS Articles
This correction stands to correct Figure 7c listing a low minimum slip of 12 m for Case 2 instead of the correct value of 8 m, as stated in the body of the text and depicted on the chart of cumulative slip. The corrected chart explanation and caption are shown below. This error did not affect any of the findings of the paper or the chart itself. This is a correction to the original article.
Cross-Scale Baroclinic Simulation Of The Effect Of Channel Dredging In An Estuarine Setting, Fei Ye, Harry V. Wang, H Huang, Zg Wang, Z Liu, X Li
Cross-Scale Baroclinic Simulation Of The Effect Of Channel Dredging In An Estuarine Setting, Fei Ye, Harry V. Wang, H Huang, Zg Wang, Z Liu, X Li
VIMS Articles
Holistic simulation approaches are often required to assess human impacts on a river-estuary-coastal system, due to the intrinsically linked processes of contrasting spatial scales. In this paper, a Semi-implicit Cross-scale Hydroscience Integrated System Model (SCHISM) is applied in quantifying the impact of a proposed hydraulic engineering project on the estuarine hydrodynamics. The project involves channel dredging and land expansion that traverse several spatial scales on an ocean-estuary-river-tributary axis. SCHISM is suitable for this undertaking due to its flexible horizontal and vertical grid design and, more importantly, its efficient high-order implicit schemes applied in both the momentum and transport calculations. These …
Linking The Abundance Of Estuarine Fish And Crustaceans In Nearshore Waters To Shoreline Hardening And Land Cover, Ms Kornis, D Breitburg, R Balouskus, Donna M. Bilkovic, La Davias, Rochelle D. Seitz, Et Al.
Linking The Abundance Of Estuarine Fish And Crustaceans In Nearshore Waters To Shoreline Hardening And Land Cover, Ms Kornis, D Breitburg, R Balouskus, Donna M. Bilkovic, La Davias, Rochelle D. Seitz, Et Al.
VIMS Articles
Human alteration of land cover (e.g., urban and agricultural land use) and shoreline hardening (e.g., bulkheading and rip rap revetment) are intensifying due to increasing human populations and sea level rise. Fishes and crustaceans that are ecologically and economically valuable to coastal systems may be affected by these changes, but direct links between these stressors and faunal populations have been elusive at large spatial scales. We examined nearshore abundance patterns of 15 common taxa across gradients of urban and agricultural land cover as well as wetland and hardened shoreline in tributary subestuaries of the Chesapeake Bay and Delaware Coastal Bays. …
Unstructured-Grid Model For The North Sea And Baltic Sea: Validation Against Observations, Yinglong J. Zhang, Ev Stanev, S Grashorn
Unstructured-Grid Model For The North Sea And Baltic Sea: Validation Against Observations, Yinglong J. Zhang, Ev Stanev, S Grashorn
VIMS Articles
A new unstructured grid model and its application to the North Sea and Baltic Sea are described. The research focus is on the dynamics in the two basins and in the multiple straits connecting them and more specifically on how the model replicates the temporal and spatial variability of physical processes. The comparison against observed data indicates the realism in the simulations of the exchange flows. The simulations demonstrated that in contrast to the tidal variability which decreases in the strait, the role of the barotropic forcing due to weather systems increases. In this zone reversal of transport is well …
Seamless Cross-Scale Modeling With Schism, Yinglong J. Zhang, Fei Ye, Ev Stanev, S Grashorn
Seamless Cross-Scale Modeling With Schism, Yinglong J. Zhang, Fei Ye, Ev Stanev, S Grashorn
VIMS Articles
We present a new 3D unstructured-grid model (SCHISM) which is an upgrade from an existing model (SELFE). The new advection scheme for the momentum equation includes an iterative smoother to reduce excess mass produced by higher-order kriging method, and a new viscosity formulation is shown to work robustly for generic unstructured grids and effectively filter out spurious modes without introducing excessive dissipation. A new higher-order implicit advection scheme for transport (TVD2) is proposed to effectively handle a wide range of Courant numbers as commonly found in typical cross-scale applications. The addition of quadrangular elements into the model, together with a …
Spawning Of American Shad (Alosa Sapidissima) And Striped Bass (Morone Saxatilis) In The Mattaponi And Pamunkey Rivers, Virginia, Donna M. Bilkovic, John E. Olney, Carl H. Hershner
Spawning Of American Shad (Alosa Sapidissima) And Striped Bass (Morone Saxatilis) In The Mattaponi And Pamunkey Rivers, Virginia, Donna M. Bilkovic, John E. Olney, Carl H. Hershner
VIMS Articles
No abstract provided.
Molting In The Mature Female Blue-Crab, Callinectes-Sapidus Rathbun, Kirk J. Havens, Jr Mcconaugha
Molting In The Mature Female Blue-Crab, Callinectes-Sapidus Rathbun, Kirk J. Havens, Jr Mcconaugha
VIMS Articles
The present study examined the hypothesis that mature female blue crabs, Callinectes sapidus, do not enter a terminal anecdysis. Induced molting via eyestalk ablation, size frequency distributions, gonad development and limb regeneration indices from field collected animals are used as indicators of potential post maturity molts. Eyestalk ablation of 15mature females resulted in ecdysis in II individuals approximately 51 days (standard error = 0.64) after ablation, indicating a physiological ability of mature females to complete ecdysis. Analysis of size frequency distributions from catch data indicated two distinct shifts from smaller to larger females, one in early spring and a second …