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Date: | Tue, 2 Sep 2003 11:39:52 -0400 |
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>Does anyone know of other molluscs that are species quite sensitive to ecosystem disturbance, and whose dissapearance or dramatic reduction in numbers might be taken as an Early Warning sign of developing problems? I know many Unionids fall into this category, but what about marine species or fresh water gastropods?<
Some freshwater gastropods seem quite tolerant of disturbance (e.g., Physa), but others are or were rather sensitive. For North America, many of the pleurocerids have declined greatly or disappeared due to disturbance. All species of Neoplanorbis (not a pleurocerid) and Gyrotoma are among the victims.
Dr. David Campbell
Old Seashells
University of Alabama
Biodiversity & Systematics
Dept. Biological Sciences
Box 870345
Tuscaloosa, AL 35487-0345 USA
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