The Ecology of Freshwater Molluscs by Robert T. Dillon

By Robert T. Dillon

Here's a entire overview of the ecology of freshwater bivalves and gastropods around the globe. Robert Dillon discusses the ecology of those species in its broadest feel, together with nutrition, habitat, and reproductive biology to stress the super variety of those freshwater invertebrates. He develops a brand new lifestyles historical past version that unifies them and reports their inhabitants and neighborhood ecology, treating pageant, predation, parasitism, and biogeography. widely referenced and synthesizing paintings from the 19th century via to the current day, this ebook comprises unique analyses that unify past paintings right into a coherent entire.

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Unio was strikingly more common nearer the lake than Anodonta, and showed increased growth rates. Norelius found the trend just as strong but in the opposite direction: Anodonta more common near the lake and Unio increasing downstream. g. chlorophyll a content) may be improved immediately below their study lake. Our discussion of mussel habitat choice thus far may give the impression that unionoid mussels prefer lakes and ponds. They do not. Worldwide, the great majority of mussel species are never found in lentic habitats.

A sample of 95 individuals from Bracebridge Pool included 20% males, 59% females, and 21% hermaphrodites. But a sample of 66 individuals from Highams Park included 38% hermaphrodites, with all the remainder apparently normal females. And populations from Beam Brook, Holmwood, Eardisland, and the River Frome appeared to be composed almost entirely of hermaphrodites. ’ Bloomer found all combinations of visceral and marsupial sex among English A. cygnea. Most commonly, both eggs and sperm were made in the viscera, and the marsupium was female.

But the evidence is now fairly strong that any periodicity Anodonta may show in valve activity occurs at two different frequencies. Barnes (1962) described a rapid rhythm resulting in up to 20 partial closures per hour and a slower rhythm, showing perhaps three complete closures of several hours each per day in A. cygnea. De Bruin and David (1970) also noted regular interruptions of the water current in A. cygnea at a frequency of 6–40 per hour, but their experiment was not designed to detect longer-period cycles.

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