You are not currently logged in.
Access JSTOR 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.
Life Cycle and Reproduction of Nephelopsis obscura Verrill (Hirudinea:Erpobdellidae) in Permanent Ponds of Northwestern Minnestoa
Dirk L. Peterson
Freshwater Invertebrate Biology
Vol. 2, No. 4 (Nov., 1983), pp. 165-172
Stable URL: http://www.jstor.org/stable/1467147
Page Count: 8
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
The bait leech, Nephelopsis obscura, followed a 24-month life cycle in two natural ponds of northwestern Minnesota, Priem's Pond and Early's Pond. Clitellum development required an approximate minimum weight of 1.20 g and mature leeches died shortly after depositing cocoons on aquatic vegetation at midsummer. The onset of maturity was correlated to rising water temperature (r=0.98) and lengthening photoperiod (r=0.93). Seasonal depth movement of leeches was obseved in Priem's Pond and was attributed to oxygen depletion at lower depths during midsummer stagnation.
Freshwater Invertebrate Biology © 1983 The University of Chicago Press