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35 results on '"Schloesser, Don W."'

7. Distribution of Native Mussel (Unionidae) Assemblages in Coastal Areas of Lake Erie, Lake St. Clair, and Connecting Channels, Twenty-five Years After a Dreissenid Invasion

Author

Zanatta, David T., Bossenbroek, Jonathan M., Burlakova, Lyubov E., Crail, Todd D., de Szalay, Ferenc, Griffith, Traci A., Kapusinski, Douglas, Karatayev, Alexander Y., Krebs, Robert A., Meyer, Elizabeth S., Paterson, Wendy L., Prescott, Trevor J., Rowe, Matthew T., Schloesser, Don W., and Walsh, Mary C.

Published
2015

10. Bibliography of Dreissena polymorpha (zebra mussels) and dreissena rostriformis bugensis (quagga mussels): 1989 to 2011

Author

Schloesser, Don W. and Schmuckal, Christine

Subjects
Bibliography -- Usage -- Research, Zebra mussels -- Study and teaching -- Research, Biological sciences, Zoology and wildlife conservation
Abstract

ABSTRACT Dreissenid mussels invaded and colonized waters of the Laurentian Great Lakes during the late 1980s. Their colonization and resulting impact have been characterized as one of the most important [...]

Published
2012
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25. A 200 year chronology of burrowing mayflies (Hexagenia spp.) in Saginaw Bay.

Author

Schloesser, Don W., Robbins, John A., Matisoff, Gerald, Nalepa, Thomas F., and Morehead, Nancy R.

Abstract

After an absence of 50 years, burrowing mayflies (Hexagenia spp.) colonized western Lake Erie which led to interest in whether this fauna can be used to measure recovery in nearshore waters throughout the Great Lakes. However, in many areas we do not know if mayflies were native/endemic and thus, whether recovery is a logical measure to assess progress of recovery. In the present study, we construct a chronological record of relative abundance of burrowing mayflies in Saginaw Bay by the use of mayfly tusks and radionuclides in sediments (i.e., a paleoecologic record) and historic records of mayfly nymphs in the bay. These records reveal that mayflies: (1) were few before 1799, which indicates that nymphs were probably native/endemic in the bay, (2) increased between 1799 and 1807 and remained at relatively high levels between 1807 and 1965, probably in response to increased nutrient run-off from the watershed, (3) declined dramatically between 1965 and 1973, probably as a result of excessive eutrophication in the mid-1950s; and (4) were few and highly variable between 1973 and 2001, probably as a result of low and unstable abundances of mayfly nymphs. Historic records verify that nymphs disappeared in the bay in the late-1950s to early-1960s which is in agreement with the paleoecological record. Reoccurrence of low abundances of nymphs in the bay between 1991 and 2008 and comparison of chronologic records of nymphs in Saginaw Bay and western Lake Erie suggest that mayflies may return to Saginaw Bay in the early-21st century. Undoubtedly, watershed conservation and three decades of pollution abatement have set the stage for a recovery of burrowing mayflies in Saginaw Bay, and possibly in other areas of the Great Lakes. [ABSTRACT FROM AUTHOR]

Published
2014
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32. Changing Abundance of HexageniaMayfly Nymphs in Western Lake Erie of the Laurentian Great Lakes: Impediments to Assessment of Lake Recovery?

Author

Schloesser, Don W. and Nalepa, Thomas F.

Abstract

After an absence of 40 years, mayfly nymphs of the genus Hexageniawere found in sediments of western Lake Erie of the Laurentian Great Lakes in 1993 and, by 1997, were abundant enough to meet a mayfly‐density management goal (ca. 350 nymphs m—2) based on pollution‐abatement programs. We sampled nymphs in western Lake Erie and Lake St. Clair, located upstream of western Lake Erie, to determine the importance of seasonal abundance and life‐history characteristics of nymphs (e.g., emergence and recruitment) on density estimates relative to the mayfly‐density management goal. Two types of density patterns were observed: (1) densities were relatively high in spring and gradually decreased through late summer (observed in Lake Erie and Lake St. Clair in 1997 and Lake St. Clair in 1999) and (2) densities were relatively high in spring, gradually decreased to mid summer, abruptly decreased in mid summer, and then increased between summer and late fall (Lake Erie and Lake St. Clair in 1998 and Lake Erie in 1999). Length‐frequency distributions of nymphs and observations of adults indicate that the primary cause for the two density patterns was attributed to failed (first pattern) and successful (second pattern) reproduction and emergence of nymphs into adults in mid summer. Gradual declines in densities were attributed to mortality of nymphs. Our results indicate that caution should be used when evaluating progress of pollution‐abatement programs based on mayfly densities because recruitment success is variable both between and within years. Additionally, the interpretation of progress toward management goals, relative to the restoration of Hexageniapopulations in the Great Lakes and possibly other water bodies throughout the world, is influenced by the number of years in which consequtive collections are made.

Published
2001
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