. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. M. Figure 1. A'»/<K avis, viewed from shell side. B. bill-like projection surrounding the orifice; C, crest-like projection; D, attachment disk; M. complemented males (five males, including the one on the other side, are attached to this specimen); S, scutum. Scale bar. 5 mm. such as living Anemia larvae, minced mysids, or commer- cial fish meal, all of which were readily eaten by Lepas spp. (pers. obs.). Fecal pellets of Koleolepas were cream white, a color similar to that of its host's tentacles. When observed under a m
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. M. Figure 1. A'»/<K avis, viewed from shell side. B. bill-like projection surrounding the orifice; C, crest-like projection; D, attachment disk; M. complemented males (five males, including the one on the other side, are attached to this specimen); S, scutum. Scale bar. 5 mm. such as living Anemia larvae, minced mysids, or commer- cial fish meal, all of which were readily eaten by Lepas spp. (pers. obs.). Fecal pellets of Koleolepas were cream white, a color similar to that of its host's tentacles. When observed under a microscope, the pellets were rilled with nemato- cysts. We also found nematocysts in 80% (12/15) of the guts of newly collected barnacles. The guts of the remaining barnacles were almost empty, probably because they could eat little after the snail shells on which they lived were trapped in lobster nets. The relationship of K. avis to the host anemone can be best regarded as parasitic. We did not quantify detrimental effects on the host, mainly because the number of specimens was too small to conduct such a study. However, up to six barnacles per host (pers. obs.) may have some effects on the host, as reported for other parasitic arthropods that feed on their host anemones [a shrimp (II) and a pycnogonid (12)]. Experiments with hermit crabs are necessary to test this assumption, because the presence of hermit crabs may change the frequency with which the barnacles crop anem- one tentacles. Koleolepas avis is the only barnacle known to eat sea anemones, although two other species of barnacles have been reported to eat cnidarian prey (4, 5, 13, 14). Among cnidarian-eating barnacles, Lepas anserifera feeds on neus- tonic medusae ; s one of many food items (13, 14), whereas Hoekia moniicuLiriac, a balanomorph barnacle symbiotic with corals, seems to teed only on its host (4, 5). However. the feeding behavior of//, monticulariae is much less active than that of K. avis: that balanom
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
