Life Sciences Commons^™

Amphilochidae (Crustacea: Amphipoda) From The Western Gulf Of Mexico And Caribbean Sea, L.D. Mckinney

Gulf and Caribbean Research

Two new species of Amphilochus, Amphilochus casahoya and Amphilochus delacaya, and one new species of Gitanopsis, Gitanopsis laguna, are described. Relationships within these genera, particularly Amphilochus, are difficult to determine. The new species, however, are similar to some eastern Pacific forms. One known species, Amphilochus neapolitanus is also reported as occurring in both the Gulf and Caribbean.

Effects Of 1973 Floodwaters On Plankton Populations In Louisiana And Mississippi, Suzanne R. Hawes, Harriet M. Perry

Gulf and Caribbean Research

Studies to assess the impact of floodwater diversion on plankton populations in coastal waters of Mississippi and Louisiana were conducted from 23 April 1973 through 13 July 1973. Fixed stations in Lake Pontchartrain, Lake Borgne and western Mississippi Sound were sampled once in April, twice in May and June, and once in July. Stations in Terrebonne Parish, Louisiana were visited once in May, June and July.

Data are presented on changes in the species composition of zooplankton subsequent to the opening of the Bonnet Card and Morganza floodways. The hydrographic conditions at the time of sampling are discussed.

Food Of The Atlantic Croaker, Micropogonias Undulatus, From Mississippi Sound And The Gulf Of Mexico, Robin M. Overstreet, Richard W. Heard

Gulf and Caribbean Research

The diet of the Atlantic croaker from Mississippi Sound has been examined for the first time. Over 83 taxa were encountered, or more than were reported from croaker in any other region. We also found 60 taxa, 36 of which overlapped with the above, in croaker from various offshore stations in the Gulf of Mexico. In Mississippi Sound the frequency of occurrence of items revealed primarily crustaceans followed by polychaetes, molluscs, fishes, and less common items, and, in the open Gulf, molluscs appeared slightly more often than in inshore croaker and than polychaetes in offshore fish. The diets were assessed …

Classification Of Mississippi Sound As To Estuary Hydrological Type, Charles K. Eleuterius

Gulf and Caribbean Research

Mississippi Sound is classified as to estuary hydrological type by the method of Pritchard (1955). Differences in salinity between surface and near-bottom water were calculated from 2,401 pairs of observations made at 90 stations from 4 April 1973 to 12 April 1977. Frequency distribution tables, constructed by tallying the vertical salinity differences into three classes corresponding to three of Pritchard's estuary types (A, stratified; B, partially mixed; D, well mixed) were used to assess salinity structure of the water column. The greatest variation as to type occurred from January through June. From July through December, the water column becomes predominately …

An Improved, Conceptually Simple Technique For Estimating The Productivity Of Marsh Vascular Flora, Courtney T. Hackney, Olga P. Hackney

Gulf and Caribbean Research

The estimation of the net primary productivity of marsh communities with a periodic maximum-minimum (PMM) technique has certain advantages over the long used maximum-minimum standing stock technique, but still retains the same conceptual simplicity. The final productivity estimate with PMM is based an the entire data set rather than just two points. Direct statistical comparisons between any two communities can be made. An estimate of the productivity by minor species in the community can also be made. The periodic model permits statistical comparisons about other variables in community growth such as the timing of the maximurn standing crop. With certain …

Occurrence Of Mysidopsis Almyra Bowman, M. Bahia Molenock And Bowmaniella Brasiliensis Bacescu (Crustacea, Mysidacea) From The Eastern Coast Of Mexico, W. Wayne Price

Gulf and Caribbean Research

Three species of mysids, Mysidopsis almyra, M. bahia and Bowmaniella brasiliensis are recorded for the first time from four locations along the eastern coast of Mexico. Data on geographical distribution, population structure, length, brood size, and morphological variation are given.

Food Of The Red Drum, Sciaenops Ocellata, From Mississippi Sound, Robin M. Overstreet, Richard W. Heard

Gulf and Caribbean Research

Examined digestive tracts of the red drum in Mississippi Sound contained mostly decapod crustaceans. Crustaceans accounted for 34 of 59 encountered taxa, more than reported from any other region. Nevertheless, the general diet for 104 fish with food contents out of the 107 examined is similar to that reported for red drum in several other studies from other areas. In addition to crustaceans, fishes followed by polychaetes occurred as the most important items (in 99, 43, and 15% of the drum with food, respectively). Blue crabs occurred in even more drum than the frequently encountered penaeid shrimps. Other commercial species …

Geographical Definition Of Mississippi Sound, Charles K. Eleuterius

Gulf and Caribbean Research

Boundaries for Mississippi Sound are determined by application of definitions, established surveying practices and observations of the physical processes of the area. U.S. Coast and Gcodetic charts 1266 (1972 edition), 1267 (1972 edition) and 1268 (1974 edition) were used in ascertaining the boundaries. These boundaries provide a formal geographical definition for Mississippi Sound.

A Bibliography Of The Rhizocephala (Crustacea: Cirripedia), Adrian R. Lawler, Steven L. Shepard

Gulf and Caribbean Research

A bibliography of parasitic barnacles of the suborder Rhizocephala, including 490 titles, is presented. Scientific works from 1787 to present are listed.

Silica And Ash In The Salt Marsh Rush, Juncus Roemerianus, F.C. Lanning, Lionel N. Eleuterius

Gulf and Caribbean Research

Silica content of living rhizomes from the perennial salt marsh rush Juncus roemerianushad values of 0.34, 0.20, and 0.60% of dry weight in three morphologically distinct populations along the Mississippi coast and was directly related to available silica content of the soil (29.7, 17.0, 169.6 mg/100g soil, respectively). On the other hand, living leaves had about the same average silica content (0.93, 0.87, 0.9070 or dry weight). The silica content of living leaves varied from 0.142% in younger leaves to 1.520% in older ones. Similarly, rhizomes also increased in silica content with age, varying from 0.137% in younger portions …

Procedures For Eradication Of Hydrozoan Pests In Closed-System Mysid Culture, Adrian R. Lawler, Steven L. Shepard

Gulf and Caribbean Research

An unidentified species of hydrozoan in the family Eirenidae was inadvertently transported to the Laboratory with a stock of Mysidopsis bahia. The hydrozoan competed for food, ate the young mysids, and subsequently reproduced extensively. Hermit crabs provided minimal control. A detailed transfer procedure for the mysids eliminated the hydrozoans from cultures; hydrozoans were eradicated from tanks after removal of mysids by using 1:1200 formalin, hot water, and Clorox.

New Hosts For Lymphocystis, Adrian W. Lawler, John T. Ogle, Chad Donnes

Gulf and Caribbean Research

Lymphocystis disease is reported for the first time from the Koran angelfish, Pomacanthus semicirculatus; the Moorish idol, Zanclus canescens; the foureye butterflyfish, Chaetodon capistratus; and the orbiculate bat fish, Platax orbicularis. Also, lymphocystis is reported the second time from the queen angelfish, Holacanthus ciliaris. All hosts are commercially important exotic aquarium fishes.