. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAE ACROSS EAST PACIFIC BARRIER 149 160. Figure 2. B. Locations where larvae of polychaetes were encountered. Large filled circles show where chaetosphaera larvae of spionids were located (see Fig. 3C, D, E, F); large open circles denote localities where mesotroch larvae of Chaetopteridae were found; half-filled circles show positions where both Spioni- dae and Chaetopteridae were found. Smaller circles with rays denote localities where polychaete larvae other than the two most commonly represented families occurred. Rays
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAE ACROSS EAST PACIFIC BARRIER 149 160. Figure 2. B. Locations where larvae of polychaetes were encountered. Large filled circles show where chaetosphaera larvae of spionids were located (see Fig. 3C, D, E, F); large open circles denote localities where mesotroch larvae of Chaetopteridae were found; half-filled circles show positions where both Spioni- dae and Chaetopteridae were found. Smaller circles with rays denote localities where polychaete larvae other than the two most commonly represented families occurred. Rays on large circles indicate presence of other polychaete larvae in addition to spionids and chaetopterids. Minute circles indicate localities where polychaete larvae were absent in the samples. Arrows show points of collection of specimens in Figure 3C, D, E, F. garded as circumtropical whose wide geographic distri- bution may be the result of larval dispersal. Since the study was of a restricted habitat, one must consider the data with great reservation. The current knowledge of eastern Pacific polychaetes is probably insufficient to make any broad generalization. Finally a third kind of evidence, measurement of ge- netic similarities or differences between allopatric popu- lations, has scarcely been attempted for benthic inverte- brate species. Marked genetic similarity between central and eastern tropical Pacific populations of species would suggest sufficient gene flow to maintain the integrity of widely distributed forms. Huber (1985) showed that such gene flow probably occurs between Hawaiian and Pana- manian populations of the brachyuran decapod crusta- cean Trapezia ferruginea, since electrophoretic data show no genetic distance between them. To maintain such similarity, larval or some other mode of dispersal such as rafting (Scheltema, 1986b) would be required, , dispersal is a necessary if not a sufficient requirement for genetic exchange. The potential for such an
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
