Energy distribution in biomass estimates within a freshwater bivalve community

1982 ◽  
Vol 60 (11) ◽  
pp. 2753-2756 ◽  
Author(s):  
C. G. Paterson
Keyword(s):  
Energy Distribution ◽  
New Brunswick ◽  
Standing Stock ◽  
Freshwater Bivalve ◽  
Elliptio Complanata ◽  
Stock Biomass ◽  
Shell Fragments

In an association of the bivalves Elliptio complanata, Anodonta cataracta, and Lampsilis ochracea in a New Brunswick lake, the distribution of standing stock biomass is among tissue (64.6%), shells of living individuals (19.4%), and empty shells and shell fragments (16.0%). Failure to consider the latter two energy compartments would result in serious underestimates of standing stock biomass.

scholarly journals Evaluation of a nonlethal technique for hemolymph collection in Elliptio complanata, a freshwater bivalve (Mollusca: Unionidae)

2005 ◽  
Vol 65 ◽  
pp. 159-165 ◽  
Author(s):  
LL Gustafson ◽  
MK Stoskopf ◽  
AE Bogan ◽  
W Showers ◽  
TJ Kwak ◽  
...  
Keyword(s):  
Freshwater Bivalve ◽  
Elliptio Complanata

scholarly journals Stable Isotope Analysis and Persistent Organic Pollutants in Crustacean Zooplankton: The Role of Size and Seasonality

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1490 ◽  
Author(s):  
Roberta Piscia ◽  
Michela Mazzoni ◽  
Roberta Bettinetti ◽  
Rossana Caroni ◽  
Davide Cicala ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Isotope Analysis ◽  
Standing Stock ◽  
Fish Predation ◽  
Crustacean Zooplankton ◽  
Isotopic Signatures ◽  
Carbon And Nitrogen ◽  
Pollutant Concentrations ◽  
Stock Biomass

Zooplankton is crucial for the transfer of matter, energy, and pollutants through aquatic food webs. Primary and secondary consumers contribute to the abundance and standing stock biomass, which both vary seasonally. By means of taxa- and size-specific carbon and nitrogen stable isotope analysis, the path of pollutants through zooplankton is traced and seasonal changes are addressed, in an effort to understand pollutant dynamics in the pelagic food web. We analyzed zooplankton plurennial changes in concentration of polychlorinated biphenyls (PCBs) and dichlorodiphenyltrichloroethane and its relatives (DDTs) and in taxa-specific δ15N signatures in two size fractions, ≥450 µm and ≥850 µm, representative of the major part of zooplankton standing stock biomass and of the fraction to which fish predation is mainly directed, respectively. Our work is aimed at verifying: (1) A link between nitrogen isotopic signatures and pollutant concentrations; (2) the predominance of size versus seasonality for concentration of pollutants; and (3) the contribution of secondary versus primary consumers to carbon and nitrogen isotopic signatures. We found a prevalence of seasonality versus size in pollutant concentrations and isotopic signatures. The taxa-specific δ15N results correlated to pollutant concentrations, by means of taxa contribution to standing stock biomass and δ15N isotopic signatures. This is a step forward to understanding the taxa-specific role in pollutant transfer to planktivores and of zooplankton enrichment in PCBs and DDTs.

scholarly journals The influence of eutrophication and population biomass on common whitefish (Coregonus lavaretus) growth — the Lake Constance example revisited

2007 ◽  
Vol 64 (3) ◽  
pp. 402-410 ◽  
Author(s):  
Gregor Thomas ◽  
Reiner Eckmann
Keyword(s):  
Linear Regression Analysis ◽  
Standing Stock ◽  
Nutrient Content ◽  
Multiple Linear Regression Analysis ◽  
Lake Constance ◽  
Coregonus Lavaretus ◽  
Density Dependent ◽  
Stock Biomass ◽  
Evolutionary Response ◽  
The Impact

Accelerated growth of freshwater fish during anthropogenic eutrophication has been attributed almost exclusively to the increased nutrient content, while density-dependent effects have been largely neglected. We evaluated the relative importance of these factors by studying the growth of 43 consecutive year classes of common whitefish (Coregonus lavaretus) from Upper Lake Constance. This prealpine lake underwent eutrophication from the 1950s to 1970s, followed by reoligotrophication. Because whitefish are harvested with gill nets in a strongly size-selective way, we used back-calculated lengths of average fast-growing fish to compare growth among cohorts. Standing stock biomass was estimated based upon virtual year-class strengths. Multiple linear regression analysis revealed that growth of whitefish during their second year was most strongly related to standing stock biomass followed by PO4-P content during spring turnover and by calendar year, which was incorporated as a third independent variable (adjusted R2 = 0.84). The negative correlation between whitefish growth rate and calendar year is interpreted as evidence of an evolutionary response to the highly size-selective fishery during at least four decades. We conclude that density-dependent effects on whitefish growth are more important than had been realized previously and that the impact of eutrophication on growth of whitefish needs to be reconsidered.

Dipteran standing stock biomass and effects of aquatic bird predation at a constructed wetland

Wetlands ◽  
2000 ◽  
Vol 20 (1) ◽  
pp. 84-90 ◽  
Author(s):  
Michael C. Ashley ◽  
Julie A. Robinson ◽  
Lewis W. Oring ◽  
Gary A. Vinyard
Keyword(s):  
Constructed Wetland ◽  
Standing Stock ◽  
Aquatic Bird ◽  
Bird Predation ◽  
Stock Biomass

Population and Community Patterns of Invertebrate Drift in an Unregulated Coastal Plain River

1991 ◽  
Vol 48 (5) ◽  
pp. 811-823 ◽  
Author(s):  
Arthur C. Benke ◽  
Keith A. Parsons ◽  
Sunita M. Dhar
Keyword(s):  
Coastal Plain ◽  
Standing Stock ◽  
Dry Mass ◽  
Early Spring ◽  
Invertebrate Drift ◽  
Seasonal Patterns ◽  
Community Patterns ◽  
Preferred Habitat ◽  
Stock Biomass ◽  
Ogeechee River

Drifting invertebrates were sampled monthly during postdusk hours for 2 yr in the Ogeechee River, a sixth-order river in the southeastern United States. Drift quantities were among the highest reported in the literature, with mean biomass varying from 2.41 to 2.46 mg dry mass/m3 between years and mean density from 20.4 to 22.8 individuals/m3. Major contributors to drift biomass were Ephemeroptera (30.3%), Coleoptera (25.1%), Plecoptera (16.6%), and Trichoptera (14.5%). Taxon-specific seasonal patterns of drift biomass for several mayflies (Ephemerellidae and Isonychia) and the dominant stonefly (Perlesta placida) resulted in biomass peaks in winter – early spring. Caddisflies (mostly Hydropsychidae and Chimarra) and beetles (Elmidae and Gyrinidae) complemented the mayfly–stonefly pattern with highest values in late spring – summer. These seasonal patterns coincided with standing stock biomass patterns on submerged wood (snags), their preferred habitat. Drift values were about 5.7 times higher in the Ogeechee than in another Coastal Plain river having only one fifth the amount of snags, suggesting a relationship between habitat abundance and drift. Percentages of snag-dwelling insects found in drift were substantially higher (0.1 to > 1%) than is generally found for smaller streams, indicating drift distances and times much greater than previously shown.

Function of the Neural Sheath in Marine and Freshwater Molluscs. Evidence for Restriction of Sodium Loss in Freshwater Species

1972 ◽  
Vol 56 (2) ◽  
pp. 433-439
Author(s):  
BETTY M. TWAROG ◽  
T. HIDAKA
Keyword(s):  
Action Potentials ◽  
Marine Bivalve ◽  
Common Denominator ◽  
Freshwater Species ◽  
Freshwater Bivalve ◽  
Elliptio Complanata ◽  
Freshwater Molluscs ◽  
Freshwater Clams ◽  
Sodium Loss ◽  
Neural Sheath

1. Action potentials were observed in cerebrovisceral connectives of a marine bivalve, Mytilus edulis L., and two species of freshwater bivalve, Anodonta cataracta and Elliptio complanata. 2. In Mytilus nerve, responses to stimulation in both the intact and the de-sheathed nerve were blocked after two minutes in a sodium-free saline. Restoration of normal sodium levels reversed the block within 5 min. 3. In nerves of the freshwater species, Anodonta and Elliptio, the action potential of the sheathed nerve altered very slightly after one hour of stimulation in a sodium-free solution. The completely de-sheathed nerve, however, was blocked within one minute in sodium-free saline. The block was rapidly reversible. 4. It is concluded, contrary to conclusions of previous investigators, that the neural sheath in freshwater clams is just as vital to restriction of sodium loss as it is in amphibia and insects, and it would seem logical to seek out a common denominator of sheath function. Several possible mechanisms are put forth and discussed.

Phytoplankton in the Tara Ocean

2020 ◽  
Vol 12 (1) ◽  
pp. 233-265 ◽  
Author(s):  
Juan José Pierella Karlusich ◽  
Federico M. Ibarbalz ◽  
Chris Bowler
Keyword(s):  
Seventeenth Century ◽  
Primary Production ◽  
Standing Stock ◽  
Global Ocean ◽  
Stock Biomass ◽  
Wide Range ◽  
Geographic Distributions

Photosynthesis evolved in the ocean more than 2 billion years ago and is now performed by a wide range of evolutionarily distinct organisms, including both prokaryotes and eukaryotes. Our appreciation of their abundance, distributions, and contributions to primary production in the ocean has been increasing since they were first discovered in the seventeenth century and has now been enhanced by data emerging from the Tara Oceans project, which performed a comprehensive worldwide sampling of plankton in the upper layers of the ocean between 2009 and 2013. Largely using recent data from Tara Oceans, here we review the geographic distributions of phytoplankton in the global ocean and their diversity, abundance, and standing stock biomass. We also discuss how omics-based information can be incorporated into studies of photosynthesis in the ocean and show the likely importance of mixotrophs and photosymbionts.

Tissue Extraction Methods for Metabolic Profiling of a Freshwater Bivalve,Elliptio complanata(Lightfoot, 1786)

2016 ◽  
Vol 33 (2) ◽  
pp. 185-194 ◽  
Author(s):  
Jennifer L. Hurley-Sanders ◽  
Michael K. Stoskopf ◽  
Stacy A. C. Nelson ◽  
William Showers ◽  
J. Mac Law ◽  
...  
Keyword(s):  
Metabolic Profiling ◽  
Extraction Methods ◽  
Freshwater Bivalve ◽  
Tissue Extraction ◽  
Elliptio Complanata
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