American malacological bulletin (1987) (18157760661)

Title: American malacological bulletin

Identifier: americanmal4519861987amer (find matches)

Year: 1983 (1980s)

Authors: American Malacological Union

Subjects: Mollusks; Mollusks

Publisher: (Hattiesburg, Miss. ?) : (American Malacological Union)

Contributing Library: Smithsonian Libraries

Digitizing Sponsor: Biodiversity Heritage Library

Text Appearing Before Image:

Fig. 10. Mangrove Channel Epimangle and Channel Floor (Twin Cays—Hidden Creek, Grouper Garden): 1 = Caulerpa racemosa: Elysia subornata, Ascobulla ulla, Volvatella bermudae, Lobiger souverbiei; 2 = Caulerpa verticillata: Berthelinia caribbea Edmunds; 3 = Cladophoropsis: Ercolania coerulea: 3a = Bryopsis: Placida kingstoni; 4 = Caulerpa paspaloides: Oxynoe azuropunctata; 5 = Avrainvillea nigricans: Costasiella ocellifera; 6 = Halimeda spp.: Bosellia mimetica.

Text Appearing After Image:

MANGROVE POND FLOOR (MPF): Twin Cays (Fig. 11): In the interior of Twin Cays, broad, shallow ponds (50-100 m x <0.5 m) form at the end of major channels, apparently via decomposition of mangrove peat. The bottoms of these are largely decomposed peat, but some sandy patches oc- cur. There are sparse patches of Avrainvillea and Udotea, but high densities (Table 2) of ascoglossans occur on these algae. BACK REEF FLAT/REEF CREST (BRC): The substrate here is limestone with a thin layer of sediment localized in depressions; water is oligotrophic and a nearly constant flow crosses the BRC. Algal growth is dense, but often closely cropped by fish, especially the uncalcified algae (e.g. Cauler- pa spp.), and forms an algal turf in areas near the leeward reef crest (Lewis, 1985). Southwater Cay, north end (Fig. 12): The reef crest here is broader than at Carrie Bow Cay and the back reef is deeper (2-3 m), with higher densities of slugs. Carrie Bow Cay (Fig. 13): Much of the back reef flat here is quite shallow (<0.5 m in most areas) and exposed to surf for part of each tidal cycle. Most of the ascoglossans here feed upon Halimeda spp.; Elysia serca Marcus is ap-

Amerikanisches malakologisches Bulletin 1987

1987

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