By Robert T. Dillon
Here's a accomplished evaluate of the ecology of freshwater bivalves and gastropods world wide. Robert Dillon discusses the ecology of those species in its broadest feel, together with vitamin, habitat, and reproductive biology to stress the large range of those freshwater invertebrates. He develops a brand new existence heritage version that unifies them and studies their inhabitants and group ecology, treating pageant, predation, parasitism, and biogeography. generally 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 complete.
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Additional resources for The Ecology of Freshwater Molluscs
4. Abundance of Pisidium casertanum in the Ottawa River, plotted by current speed (depth averaged velocity, summer) and log mean sediment grain size. Large circles designate sites where mean annual clam density of individuals was 208–234 per m2, medium closed circles 120–187 per m2, small closed circles 15–90 per m2, and no clams were found in sites with open circle or ‘ϩ’ (polluted). (Data of Hamill et al. ’ to live in open water, as opposed to emergent macrophyte beds, in a pool of the Mississippi River.
This lake was 24 · Bivalve autecology formed when an explosion crater ﬁlled with water 4000 years ago, and has very steep sides. Maximum mussel densities were not reached until depths of 5–10 m in some of James’ transects, apparently because the bottom levelled oﬀ to a shelf at those depths. ) was at 1 m in a transect taken where the sediment on the steep sides was exceptionally stable. There would seem to be potential for space competition among lakedwelling mussels at their optimum depths, in a fashion analogous to that well-documented in rocky intertidal environments.
Pisidium lilljeborgii signiﬁcantly preferred the ﬁner sediments, while P. hibernicum and P. nitidum signiﬁcantly preferred the coarser. These results correspond to observations on the horizontal distribution of the three species in Lake Titisee – P. lilljeborgii substantially deeper. Meier-Brook also noticed that only P. hibernicum commonly had dense growths of blue-green algae on its shell. He placed individuals of this species along with three other Lake Titisee Pisidium species under approximately 1 cm of mud in two Petri dishes, exposing one dish to diﬀuse daylight and keeping the other dark.
The Ecology of Freshwater Molluscs by Robert T. Dillon