By David L. Strayer
Pearly mussels (Unionoidea) dwell in lakes, rivers, and streams world wide. those bivalves play very important roles in freshwater ecosystems and have been as soon as either culturally and economically useful as resources of meals, pearls, and mother-of-pearl. at the present time, besides the fact that, 1000s of species of those mussels are extinct or endangered. David L. Strayer presents a severe synthesis of the standards 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, sufficient nutrients, predators, and parasites. He additionally addresses conservation concerns that observe to different population of clean waters world wide and different urgent concerns in modern ecology.
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Additional resources for Freshwater Mussel Ecology: A Multifactor Approach to Distribution and Abundance (Freshwater Ecology Series)
The direct effect of habitat loss is simply multiplicative with that shown in Fig. 12. That is, if only 40% of the former area of suitable habitat remains and reduced migration rates cause unionoids to occupy only 70% of formerly occupied sites, then their joint effect will cause the unionoid species to occupy just 28% of the sites that it formerly occupied. The effects of habitat loss on migration rates are more complex to estimate, and depend on the spatial pattern of habitat loss and the shape of the distance-dispersal function.
HOW LARGE IS THE EXTINCTION DEBT FROM REDUCED DISPERSAL RATES? One important application of metapopulation models is estimating the degree to which unionoid species might be affected by human-induced reductions in dispersal rates. This is a special case of “extinction debt” (Tilman et al. 1994), in which the effects of human actions on biodiversity are not fully realized until many years after those actions took place. In this case, the delay may be very substantial because the long life cycle of unionoids will make metapopulation dynamics take decades to centuries to play out.
Effects of changing within-basin migration rates (m) on a unionoid metapopulation (see text for details). Contours show the percent reduction in equilibrium values of p*, the proportion of sites with suitable habitat that are occupied by the species; a value of 100 indicates that the species would be eliminated by the reduction in migration rates. The x-axis shows p* before humans reduced unionoid migration rates, and the y-axis shows the fraction f by which migration rates were reduced. 34 t h e m o n s t e r ’s pa r t s : d i s p e r s a l Where do unionoid populations actually fall on Fig.
Freshwater Mussel Ecology: A Multifactor Approach to Distribution and Abundance (Freshwater Ecology Series) by David L. Strayer