Since the mid-l9th century biologists have considered the east tropical Pacific to be a barrier for the dispersal ofcoastal marine invertebrate species. More re cently it has been maintained that this is so because planktonic larvae are unable to cross such a large cx panse of ocean. Therefore, it seems extraordinary that no observations have been made to determine whether larvae of invertebrates are actually transported by the major currents of that region. Plankton samples in the present study show that invertebrate larvae do occur within the east tropical Pacific including, but not re stricted to, those of gastropods, polychaetes, sipuncu lans, decapod crustacea, echinoderms, and coelenter atesâ€"though as a rule, their occurrence there is signifi cantly less than within the central tropical Pacific. Data from larval distributions suggest that the east tropical Pacific may act as a substantial impediment to many invertebrate forms, but that it is not a complete barrier to dispersal. Accordingly, the region is best con sidered a filter. It allows only species with a potential for an exceptionally long larval life to pass i.e., those with teleplanic larvae, while it blocks other forms that are re stncted to a shorter time in the plankton owing to an inability to delay metamorphosis or lack of an alternate mode of dispersal. The capacity for dispersal by plank tonic larvae differs among the various taxa.
Initial Evidence for the Transport of Teleplanic Larvae of Benthic Invertebrates Across the East Pacific Barrier
Published 1988 in The Biological Bulletin
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- Publication year
1988
- Venue
The Biological Bulletin
- Publication date
1988-04-01
- Fields of study
Biology, Environmental Science
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