File:American malacological bulletin (1987) (17536030643).jpg

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

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CLARK AND DeFREESE: CARIBBEAN ASCOGLOSSA 263 layers accumulate in local depressions in the limestone, and these are usually dominated by Thalassia testudinum Banks ex Konig; with decreasing sediment grain size and increas- ing organic content, seagrasses replace the algae, and the typical CS community appears as a mosaic of siphonalean algae and seagrasses. Slow to moderate water currents (<0.5 km/h) and oligotrophic to mesotrophic waters characterize these areas. Upper Florida Keys: The best example of this com- munity occurs at Point Elizabeth at the mangrove fringe, and supports a notably high diversity of ascoglossans at moderate densities. Middle Florida Keys: Long Key, Spanish Harbor Key. Both sites are near bridges that cross channels, and these areas are well-flushed by tidal currents, especially Spanish Harbor (Fig. 6). High densities of Elysia subornata Verrill, E. tuca, and E. papulosa Verrill occur here seasonally (Table 2). Lower Florida Keys (Big Pine Key, Geiger Key): Algae here are shorter and less densely spaced than at Key Largo, and animal densities are generally lower; however, this habitat supports the only known population of Mourgona germaineae Marcus and Marcus. Ferry Reach, Bermuda: This area has finer sediments and a reduced algal diversity relative to the Florida Keys and Belize. Blue Ground Range, Belize: This habitat occurs around many smaller cays among the Blue Ground Range, but densities of ascoglossans are very low except near 6 m
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-4 Fig. 5. Vertical Rock Face Caulerpa, Low Energy (Florida Keys Borrow Pits, Bermuda Causeways): 1 = Caulerpa racemosa: Ascobulla ulla, Oxynoe antillarium, Elysia subornata, E. ornata; 2 = Caulerpa verticillata: Tridachia crispata (juveniles), E. subornata; 3 = Halimeda incrassata, H. discoidea: Bosellia mimetica, E. tuca; 4 = Penicillus dumetosus (Lamouroux) Blainville: Cyerce antillensis; 5 = Bryopsis: Placida kingstoni, Elysia ornata. 100 m Om

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