Water depth, flow variability, and size class influence the movement behavior of freshwater mussels (Unionida) in Great Lakes river drainages

2021 ◽  
pp. 000-000
Author(s):  
Kyle T. Sullivan ◽  
Daelyn A. Woolnough
Keyword(s):  
Great Lakes ◽  
Water Depth ◽  
Freshwater Mussels ◽  
Size Class ◽  
Movement Behavior ◽  
Flow Variability ◽  
River Drainages

scholarly journals Fossil glochidia (Bivalvia, Unionidae): identification and value in palaeoenvironmental reconstructions

1998 ◽  
Vol 17 (2) ◽  
pp. 179-182 ◽  
Author(s):  
David C. Aldridge ◽  
David C. Horne
Keyword(s):  
Fish Species ◽  
Water Depth ◽  
Freshwater Mussels ◽  
Palaeoenvironmental Reconstructions

Abstract. Preserved valves of fossil glochidia have been recovered from Holocene lake marls at Quidenham Mere, UK. Detailed morphological comparisons with glochidia removed from live adult unionids have enabled confident identification of the fossil glochidia as those of Anodonta anatina. Fossil glochidia are potentially powerful tools in the interpretation of palaeoenvironments. Different species of freshwater mussels are known to release glochidia at different times of the year and, therefore, the occurrence of fossil glochidia can provide information on the season during which sediments accumulated. Furthermore, glochidia can provide information on the presence of certain fish species and on water depth.

Absence of genetic structure reflects post-glacial history and present-day host use in Mapleleaf (Quadrula quadrula) mussel from Manitoba, Canada

2020 ◽  
Vol 98 (8) ◽  
pp. 551-556
Author(s):  
N.M. VanTassel ◽  
C.E. Beaver ◽  
D.A. Watkinson ◽  
T.J. Morris ◽  
D.T. Zanatta
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Great Lakes ◽  
Host Use ◽  
Ohio River ◽  
Glacial History ◽  
Genetic Population ◽  
Genetic Diversity And Structure ◽  
Declining Populations ◽  
River Drainages

Our study documents and analyzes the absence of genetic diversity and structure of the Mapleleaf (Quadrula quadrula (Rafinesque, 1820)) (Bivalvia: Unionidae) mussel in the Lake Winnipeg, Assiniboine River, and Red River drainages (Manitoba, Canada). Previous studies have revealed patterns of genetic diversity and structure in the Mississippi and Ohio river drainages, as well as in the Laurentian Great Lakes drainage. Genotypes from six variable microsatellite loci showed that the Q. quadrula population in Manitoba was significantly differentiated from the population in the Great Lakes drainage (Ontario, Canada), supporting the existence of two Designatable Units in Canada. Conversely, there was no evidence of genetic structure within the sampled range of Q. quadrula in Manitoba. The lack of genetic structure in Q. quadrula across its distribution in Manitoba reflected its post-glacial history and use of a vagile host and necessitates that efforts should be made to ensure connectivity and maintain gene flow across the region. Given that the evidence suggests that Manitoba Q. quadrula belong to a single genetic population, movement of hatchery-propagated juvenile Q. quadrula, adult Q. quadrula, or glochidia-carrying host catfish sourced from any location in Manitoba could be used to augment declining populations or at-risk locations in Manitoba.

Profundal Testate Amoebae (Arcellacea) of Lake Superior and Lake Michigan

2020 ◽  
Vol 50 (1) ◽  
pp. 3-10 ◽  
Author(s):  
Krystyna M. Kornecki ◽  
Miriam E. Katz
Keyword(s):  
Pilot Study ◽  
Great Lakes ◽  
Water Depth ◽  
Lake Michigan ◽  
Lake Superior ◽  
Testate Amoebae ◽  
Sediment Surface ◽  
Valuable Insight ◽  
Water Interface ◽  
Large Lake

Abstract Sediment surface death assemblages of recent testate amoebae (Arcellacea) are reported from nine sites in Lake Superior and Lake Michigan. These are the first profundal sediment-water interface samples of testate amoebae described from either of the Great Lakes which provide valuable insight on deep-water, large-lake assemblages. Centropixid strains were present to abundant in shallower, nearshore sites (up to 66 m water depth). Assemblages at depths >40 m were dominated by Difflugia oblonga “tenuis.” The shallowest sample (26 m) was dominated by Centropyxis aculeata “discoides” and Difflugia oblonga “tenuis.” Over 100 tests per sample were observed from >100 m. Density of tests appears to be constrained by lithology rather than water depth. The deepest site (325 m) yielded low foraminiferal abundances. This pilot study provides a first step towards documenting the distribution of testate amoebae in the Great Lakes.

Screen Mesh Size Affects Estimates of Macro- and Meio-benthos Abundance and Biomass in the Great Lakes

1981 ◽  
Vol 38 (9) ◽  
pp. 1027-1034 ◽  
Author(s):  
Thomas F. Nalepa ◽  
Andrew Robertson
Keyword(s):  
Great Lakes ◽  
Body Length ◽  
Water Depth ◽  
Lake Michigan ◽  
Mesh Size ◽  
Dry Weight ◽  
Head Capsule ◽  
Future Studies ◽  
Almost All ◽  
Screen Mesh

The efficiencies of screens with mesh openings of 595 and 106 μm in retaining, respectively, the macro- and meio-benthos were measured for samples taken in southeastern Lake Michigan. The use of these screens provides adequate estimates of dry weight biomass for both the macro- and meio-benthos, but serious underestimates of the numbers of many taxa, most notably naidids, enchytraeids, chironomids, nematodes, and rotifers, can result. For chironomids, retention on the 595-μm screen varied by species, with overall retention being closely related to both body length and head capsule width. Retention for certain macro-benthic taxa was significantly related to sampling date and water depth, indicating that future studies concerned with these variables should use mesh sizes small enough to retain all (or almost all) of the individuals of the taxa of interest.Key words: mesh size, screen efficiency, percent retention, macrobenthos, meibenthos, Lake Michigan

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