02108nas a2200193 4500008004100000245010000041210006900141300001000210490000600220520147100226653002601697653002101723653002101744100002001765700002001785700002301805700001901828856006701847 2011 eng d00aStatus of Fishes in Selected Adirondack Lakes: Eight Decades of Changing Assemblage Composition0 aStatus of Fishes in Selected Adirondack Lakes Eight Decades of C a21-390 v43 a

Twenty-six taxa of fish were present in eighteen lakes in the southwestern quadrant of the Adirondack Park,
Herkimer and Hamilton Counties, New York. Species richness in the lakes ranged from 1 to 18 species. Here we assess
the condition and composition of the fish assemblages in lakes and compare in-lake changes in species composition over
an 80-yr period. To examine assemblage condition we estimated population size of species in the lakes using
mark-and-recapture techniques. To examine change in composition we compared the assemblage structure of these lakes
to that present in two previous surveys. Populations of all but the rarest species comprised several size classes, indicating
successful recruitment for all common species in all lakes. Most lakes support a rich, viable assemblage, although all but
one includes, and many are dominated by, exotic species. Although the lakes studied are in one ecoregion and often in the
same subdrainage, species composition differed among lakes and composition and abundance differed within lakes over
time. Assessments of the fish assemblage composition in these lakes, when compared over time showed marked
differences. These differences might be the result of several factors, but the presence of exotic taxa and extirpation of
native fishes can explain gross changes in fish assemblage composition in these Adirondack lakes.

10aAdirondack Park lakes10afish assemblages10aSpecies richness1 aDaniels, R., A.1 aBombard, R., T.1 aSutherland, J., W.1 aBoylen, C., W. uhttp://benthamopen.com/contents/pdf/TOFISHSJ/TOFISHSJ-4-21.pdf02003nas a2200253 4500008004100000245007300041210006900114300001000183490000700193520128900200653001201489653001801501653001201519653001401531653001201545653001601557653001601573653002101589653001601610100002201626700001701648700001901665856006501684 1996 eng d00aChanges in the Zooplankton of Onondaga Lake: Causes and Implications0 aChanges in the Zooplankton of Onondaga Lake Causes and Implicati a59-710 v123 a

The zooplankton assemblage of ionically polluted, culturally eutrophic Onondaga Lake was monitored over the 1979–1989 interval, and compared to surveys conducted in 1968 and 1978. A major shift in the assemblage was apparent by 1987, soon after the closure (1986) of an industrial discharger of ionic (Cl; Na+ and Ca2+) waste. Species richness increased from 8 to 18 common species, and more efficient grazers, large-bodied cladocera and the calanoid copepod Diaptomus sitihides, became dominants. Until 1987, a single cyclopoid copepod, Cyclops vernalis, was the dominant component of zooplankton biomass. The most likely cause for the shift in the zooplankton assemblage of the lake is the reduction in salinity, and attendant precipitation of calcium carbonate, associated with the closure of the industry. Improved clarity in the lake, manifested largely as intervals of dramatic increases described as ‘clearing events’, observed annually since 1987, has been attributed to die shift to more efficient grazers. The increased grazing pressure, particularly from large daphnids, may also be responsible for the return of late summer nuisance blooms of filamentous cyanobacteria, not observed in the lake since the early 1970s.

10aclarity10acyanobacteria10adaphnid10adiversity10agrazing10aionic waste10aSecchi disc10aSpecies richness10azooplankton1 aSiegfried, C., A.1 aAuer, N., A.1 aEffler, S., W. uhttp://www.tandfonline.com/doi/abs/10.1080/07438149609353997