By David L. Strayer
Pearly mussels (Unionoidea) stay in lakes, rivers, and streams around the globe. those bivalves play vital roles in freshwater ecosystems and have been as soon as either culturally and economically important as resources of foodstuff, pearls, and mother-of-pearl. at the present time, notwithstanding, hundreds of thousands of species of those mussels are extinct or endangered. David L. Strayer presents a serious synthesis of the criteria that keep an eye on the distribution and abundance of pearly mussels. utilizing empirical analyses and versions, 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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Extra info for Freshwater Mussel Ecology: A Multifactor Approach to Distribution and Abundance (Freshwater Ecology Series)
The Levins-type metapopulation models do not offer any insight into the speed of extinctions to be expected from impaired dispersal. I doubt that there are many data on the long-term dynamics of unionoid populations that have been subjected to habitat fragmentation but not to other serious human impacts; such data could be used to parameterize a dynamic model of dispersal impairment in mussel metapopulations. Because of the long life-span of unionoids it may take decades to centuries for this extinction debt to be realized, however.
To the extent that sediment stability is important to mussels, these human activities may have caused widespread harm to mussel populations. t h e m o n s t e r ’s pa r t s : h a b i tat 51 Pools M. falcata / meter 40 Riffles Runs 30 20 10 0 -10 0 100 200 300 400 2 Boundary shear stress (N/m ) figure 20. Mussel density at various sites along the Eel River, California, as a function of modeled shear stress during the 5-year flood. From Howard and Cuffey (2003). curre nts that de live r food I will discuss the food requirements of unionids below, but note briefly here that the characteristics of the habitat may strongly influence delivery of food to mussels.
2003) suggested that changing hydrology in small Scottish streams was washing out fine sediments capable of providing burrowing sites for mussels, and thereby reducing recruitment of Margaritifera margaritifera. Strayer and Ralley (1993) found that the percentage of sediment that was penetrable was a useful predictor of mussel distribution in a stony New York river, although it accounted for only a small percentage of the variance in mussel distribution. Thus, both excessively soft and excessively hard sediments probably often limit the spatial distribution of mussel populations.
Freshwater Mussel Ecology: A Multifactor Approach to Distribution and Abundance (Freshwater Ecology Series) by David L. Strayer