By David L. Strayer
Pearly mussels (Unionoidea) dwell in lakes, rivers, and streams world wide. those bivalves play vital roles in freshwater ecosystems and have been as soon as either culturally and economically helpful as resources of foodstuff, pearls, and mother-of-pearl. at the present time, even though, thousands of species of those mussels are extinct or endangered. David L. Strayer offers a serious synthesis of the criteria that regulate the distribution and abundance of pearly mussels. utilizing empirical analyses and types, he assesses the consequences of dispersal, habitat caliber, availability of fish hosts, enough nutrition, predators, and parasites. He additionally addresses conservation matters that practice to different population of unpolluted waters world wide and different urgent matters in modern ecology.
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Additional resources for Freshwater Mussel Ecology: A Multifactor Approach to Distribution and Abundance (Freshwater Ecology Series)
Modified from van der Schalie (1938). and Corkum 1995), and riparian vegetation (Morris and Corkum 1996) for which mechanisms are not known. Although such purely empirical habitat associations are useful, it often would be more useful to understand the mechanisms that underlie these relationships. t h e m o n s t e r ’s pa r t s : h a b i tat 47 One possible alternative to traditional approaches to mussel habitat is to adopt a more functional, “mussel’s eye” view of habitat. That is, perhaps we should begin with a list of what a mussel needs from its habitat rather than a list of what we first notice when we visit a stream at low water.
It is beginning to appear that sediment stability may frequently be a necessary requirement for a stream habitat to be suitable for unionoids. However, recognizing stable habitats (without waiting for a big flood to show where they are), and identifying the degree of stability that is required for various species are likely to be difficult problems. Hydraulic models may be a useful tool (Fig. 20; Lamouroux et al. 1992, Lamouroux and Capra 2002, Howard and Cuffey 2003, Lamouroux and Jowett 2005, Morales et al.
10). Likewise, it appears that the stocking of smallmouth bass into the Potomac figure 10. , Lake Erie) into the Hudson River basin following the opening of the Erie Canal in 1825 (modified from Strayer and Jirka 1997). The heavy bar shows the approximate location of the drainage divide before the canal. Although both species are widespread west of the Alleghenian Divide, they are found east of the divide only along the courses of the Erie and Champlain Canals. (The different symbols show collections from different time periods and are not relevant here).