You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Secondary Production of Two Lotic Snails (Pleuroceridae:Elimia)
Terry D. Richardson, Joseph F. Scheiring and Kenneth M. Brown
Journal of the North American Benthological Society
Vol. 7, No. 3 (Sep., 1988), pp. 234-245
Stable URL: http://www.jstor.org/stable/1467423
Page Count: 12
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
We investigated secondary production by two stream gastropods, Elimia clara and E. cahawbensis (Pleuroceridae). Monthly production was estimated for each of five size classes for both species using the instantaneous growth method. Both laboratory and field growth rates were estimated monthly for each size class from individuals kept in growth chambers. Growth rates in the field and in the laboratory did not differ significantly (p > 0.05). Laboratory growth rates were used to construct growth curves, which indicated that individuals of E. clara and E. cahawbensis may live for 11 and 10 yr, respectively. Growth and production varied widely from month to month for each species while biomass remained relatively constant. These snails have relatively high standing stocks when compared with most lotic invertebrates: E. clara with 5.4 g AFDM/m2 and E. cahawbensis with 2.3 g AFDM/m2. Because of slow growth, annual production was low when compared with other estimates for snails: 0.8 and 1.6 g AFDM/m2 for E. clara (field and laboratory estimates, respectively) and 0.6 and 0.7 g AFDM/m2 for E. cahawbensis. Annual turnover of biomass was slow (approximately 0.3 for both species) owing to the long life cycle.
Journal of the North American Benthological Society © 1988 The University of Chicago Press