By Marianne C. Eckroth, Ralph O. Brinkhurst (auth.), Kathryn A. Coates, Trefor B. Reynoldson, Thomas B. Reynoldson (eds.)
Recent experiences on various points of the biology of clitellate works (oligochaetes and leeches) are present in the complaints of the newest foreign Symposium on Aquatic Oligochaete Biology - from improvement to inhabitants dynamics and from ultrastructure to evolution. nearly all of the contributions, that have a truly wide geographic scope, are investigations of the biology and ecology of oligochaete works in usual and polluted waters.
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Additional resources for Aquatic Oligochaete Biology VI: Proceedings of the VI International Symposium on Aquatic Oligochaetes held in Stromstat, Sweden, September 5–10, 1994
SARDINIA Rivers: San Giovanni, Riu Badu, Posada, Tirso, Su Gologone. Lakes: Coghinas, Posada. habitats - springs, streams, rivers, lakes, pools, and upland cattle ponds. Specimens collected in the field were fixed with 10% formalin and stored in 70% ethanol. All spec- imens were mounted whole either as semipermanent mounts in 50% glycerol/50% lactic acid or as permanent mounts in Hydramount TM or Canada balsam. Drawings were completed using a Zeiss drawing tube 39 Table 1. Freshwater and marine Oligochaeta and geographic distribution in Italy: N =Northern Italy; S =central and southern I~y; Si =Sicily, Sa =Sardinia; FAO fishery zones: 3 =western basm, 4 =upper and middle-Adriatic, 5 =remaining basins.
4h), all immatures with vesicle-framed coelomocytes share the band positions found characteristic for F. sp. "Z" (Fig. 4, a, c-g). Immature specimens with different coelomocytes, in turn, do not agree with mature specimens of F. sp. "Z" with regard to band patterns (Fig. 4, i-n). Only one single small specimen (Fig. 4, h) shares the band positions of F. sp. "Z", but does not show the "Z"-specific coelomocytes. , 1994; Weider, 1992). This may be due to the fact that gener- Fig. 4. Comparison of general protein patterns of Fridericia sp.
Carmona et at. (1989) found both seasonally and geographically determined variability in general protein patterns of a rotifer species. In our study, F. galba from a single population exhibits considerable variability of band patterns in the anodic area (Fig. 3), indicating a genetic diversity similar to what Christensen et at. (1992), using isozyme patterns, found for a Danish Fridericia galba field population. It was nonetheless possible to identify a group of prominent bands as species-specific for the sampling site.