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Aquaculture and Fisheries Commons

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Biological Sciences Peer-Reviewed Articles

2014

Articles 1 - 6 of 6

Full-Text Articles in Aquaculture and Fisheries

Field Experimental Evidence That Grazers Mediate Transition Between Microalgal And Seagrass Dominance, Pl Reynolds, Jp Richardson, Je Duffy Jan 2014

Field Experimental Evidence That Grazers Mediate Transition Between Microalgal And Seagrass Dominance, Pl Reynolds, Jp Richardson, Je Duffy

VIMS Articles

We tested the relative effects of nutrient loading, reduced predation, and reduced grazing on eelgrass community dynamics in Chesapeake Bay and found evidence supporting the "mutualistic mesograzer model" in which small invertebrate grazers control accumulation of epiphytic algae, buffer eutrophication effects, and thus facilitate seagrass dominance. Experimental reduction of crustacean grazers in the field stimulated a nearly sixfold increase in epiphytic algae, and reduced seagrass biomass by 65% compared to controls with grazers. Nutrient fertilization generally had much weaker effects, but an interaction with mesograzers was key in changing the sign of fertilization effects on the system: aboveground eelgrass biomass ...


Ecological Value Of Coastal Habitats For Commercially And Ecologically Important Species, Rd Seitz, H Wennhage, U Bergstrom, Rn Lipcius, T Ysebaert Jan 2014

Ecological Value Of Coastal Habitats For Commercially And Ecologically Important Species, Rd Seitz, H Wennhage, U Bergstrom, Rn Lipcius, T Ysebaert

VIMS Articles

Many exploited fish and macroinvertebrates that utilize the coastal zone have declined, and the causes of these declines, apart from overfishing, remain largely unresolved. Degradation of essential habitats has resulted in habitats that are no longer adequate to fulfil nursery, feeding, or reproductive functions, yet the degree to which coastal habitats are important for exploited species has not been quantified. Thus, we reviewed and synthesized literature on the ecological value of coastal habitats (i.e. seagrass beds, shallow subtidal and intertidal habitats, kelp beds, shallow open water habitats, saltmarshes, mussel beds, macroalgal beds, rocky bottom, and mariculture beds) as feeding ...


Biogeochemical Variability In The Southern Ross Sea As Observed By A Glider Deployment, De Kaufman, Mam Friedrichs, Wj Smith Jr., By Queste, Kj Heywood Jan 2014

Biogeochemical Variability In The Southern Ross Sea As Observed By A Glider Deployment, De Kaufman, Mam Friedrichs, Wj Smith Jr., By Queste, Kj Heywood

VIMS Articles

High-resolution autonomous glider data (including temperature, salinity, fluorescence, and optical backscatter) collected during the 2010-2011 austral summer identified variations in phytoplankton biomass along two glider sections near 76 degrees 40'S. Sea surface temperatures were warmer during the latter, westward section, while mixed layer depths were deeper. Substantial quantities of Modified Circumpolar Deep Water, identified by neutral density criteria, were located within both sections. Chlorophyll (Chl) concentrations computed from fluorescence exhibited daily quenching near the surface, and deep chlorophyll concentrations at 200 m became periodically elevated, suggesting substantial export on small space and time scales. The concentrations of particulate organic ...


Multifunctionality Does Not Imply That All Functions Are Positively Correlated, J Byrnes, Js Lefcheck, L Gamfeldt, Jn Griffin, F Isbell Jan 2014

Multifunctionality Does Not Imply That All Functions Are Positively Correlated, J Byrnes, Js Lefcheck, L Gamfeldt, Jn Griffin, F Isbell

VIMS Articles

No abstract provided.


Zooplankton Carcasses And Non-Predatory Mortality In Freshwater And Inland Sea Environments, Kw Tang, Mi Gladyshev, Op Dubovskaya, G Kirillin, Hp Grossart Jan 2014

Zooplankton Carcasses And Non-Predatory Mortality In Freshwater And Inland Sea Environments, Kw Tang, Mi Gladyshev, Op Dubovskaya, G Kirillin, Hp Grossart

VIMS Articles

Zooplankton carcasses are ubiquitous in marine and freshwater systems, implicating the importance of non-predatory mortality, but both are often overlooked in ecological studies compared with predatory mortality. The development of several microscopic methods allows the distinction between live and dead zooplankton in field samples, and the reported percentages of dead zooplankton average 11.6 (minimum) to 59.8 (maximum) in marine environments, and 7.4 (minimum) to 47.6 (maximum) in fresh and inland waters. Common causes of non-predatory mortality among zooplankton include senescence, temperature change, physical and chemical stresses, parasitism and food-related factors. Carcasses resulting from non-predatory mortality may ...


Value Of Coastal Habitats For Exploited Species: Introduction To A Theme Set Of Articles, Rd Seitz Jan 2014

Value Of Coastal Habitats For Exploited Species: Introduction To A Theme Set Of Articles, Rd Seitz

VIMS Articles

Many exploited fish and invertebrate species use coastal habitats during one or more life-history stages as spawning, feeding, and nursery areas; yet, the value of these habitats has not been adequately characterized. As habitat availability can be a bottleneck for many populations, concerns about habitat effects on exploited species have been increasing. We have compiled nine articles presenting the state of knowledge and future research priorities regarding the importance of habitat for exploited species. Reviews from European habitats and several geographical locations throughout the United States demonstrate the influence of coastal habitats on survival, growth, and movement, especially during the ...