Biol. Bull. Sign up for etocs!
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Biol Bull 61: 242-271. (October 1931)
© 1931 Marine Biological Laboratory
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by STUNKARD, H. W.
Right arrow Articles by SHAW, C. R.
Right arrow Search for Related Content
PubMed
Right arrow Articles by STUNKARD, H. W.
Right arrow Articles by SHAW, C. R.

THE EFFECT OF DILUTION OF SEA WATER ON THE ACTIVITY AND LONGEVITY OF CERTAIN MARINE CERCARIÆ, WITH DESCRIPTIONS OF TWO NEW SPECIES

H. W. STUNKARD 1 and C. RUTH SHAW 1

1 From the Biological Laboratory, New York University, and the Marine Biological Laboratory, Woods Hole, Mass

The problem concerning the origin and distribution of closely related parasites that occur in marine and fresh-water hosts is discussed. Migration of hosts and transfer to new hosts are the only explanations that appear tenable. The essential factor is the ability of the free-swimming larvæ to live and remain infective in a changed environment. Experiments on the ability of six species of marine cercariæ to withstand dilution of sea water show that these larvæ manifest normal activity for considerable periods of time in solutions containing only one-eighth to one-fourth sea water. The observations indicate that these cercariæ are able to complete their life cycles in brackish water and denote the extent to which these organisms may migrate into brackish or fresh water.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1931 by the Marine Biological Laboratory.