(Volume 14, March 2002)
SPATIAL AND TEMPORAL VARIABILITY IN ZOOPLANKTON COMMUNITY DYNAMICS IN THREE URBANIZED BAYOUS OF THE PENSACOLA BAY SYSTEM, FLORIDA, USA
Emile M. Lores1, Michael A. Lewis1, and Ziad A. Malaeb2
1US Environmental Protection Agency, 1 Sabine Island Drive,
Gulf Breeze, Florida 32561, USA. Email: email@example.com
24800 Rucker Boulevard #241, Enterprise, Alabama 36336, USA
ABSTRACT Spatial and temporal patterns in zooplankton community composition and abundance in coastal areas of the Gulf of Mexico are not well understood. Spatial and temporal differences in zooplankton community composition and abundance from 10 stations located in four sites are presented (Pensacola Bay and Bayou Texar, Bayou Chico, and Bayou Grande, three adjacent mesohaline-tidal bayous affected by urban and industrial development). Statistically significant differences (P <0.05) were found in log-biovolurne among sites. The mean biovolume of zooplankton was highest in Pensacola Bay (0.38 ml m-3) followed by Bayou Grande (0.21 ml m-3). Bayou Chico (0.14 ml m-3). and Bayou Texar (0.06 ml m-3). Mean zooplankton abundances (organisms m-3) in Pensacola Bay (3,100 m-3) and Bayou Grande (3,000 m-3) were more than double the abundances in Bayou Texar (1,400 m-3) and Bayou Chico (1,100 m-3). The calanoid copepod Acartia tonsa Dana was the dominant species in the study area. The observed differences in the zooplankton community may be attributable to either one or a combination of factors such as water quality (toxicity), predation, and nutrient availability. Zooplankton abundance increased following two hurricanes that impacted the study area.
HYDROBIID SNAILS (MOLLUSCA: GASTROPODA: RISSOOIDEA) FROM ST. ANDREW BAY, FLORIDA
Richard W. Heard, Robin M. Overstreet, and John M. Foster
Department of Coastal Sciences, College of Marine Sciences,
The University of Southern Mississippi,
703 East Beach Drive,
Ocean Springs, MS 39564
E-mails: firstname.lastname@example.org, email@example.com, firstname.lastname@example.org
ABSTRACT Heleobops sp. of Hershler and Thompson appears to be the only previously published record for the gastropod family Hydrobiidae Troschel in tidal waters of the St. Andrew Bay System, Florida. Six species occurred in bayous, marshes, and brackish ponds associated with the System during studies conducted between 1984 and 1999: Texadina barretti (Morrison), Texadina sphinctostoma Abbott and Ladd, Littoridinops monroensis (Frauenfeld), Littoridinops palustris Thompson, Onobops jacksoni (Bartsch), and Heleobops sp. A. The last is an apparently undescribed species closely related to Heleobops carrikeri Davis and McKee. Based in part on this study, Heleobops sp. A, which occurs in brackish habitats from the System westward to the Chandeleur Islands, is considered conspecific with Heleobops sp. of Hershler and Thompson (1992) as well as Heleobops sp. Forms B and C of Heard (1992). There are two ecophenotypic shell types of Heleobops sp. A, a grayish-brown, smooth-shelled, intertidal variant and a tannish, light-orange, striate, subtidal form, which represent Forms B and C of Heard, respectively. In addition to constituting new records, the occurrence of T. barretti and T. sphinctostoma in the St. Andrew Bay System represents eastern range extensions for both species. Although their ranges encompass northwestern Florida, L. palustris and L. monroensis are reported from the System for the first time. The relatively large egg capsules of Heleobops sp. A, L. palustris, and L. monroensis each contain a single ovum, and, depending on temperature, generally require 9 to 14 days before hatching as juveniles. The egg capsules of T. barretti, T. sphinctostoma, and 0. jacksoni also contain a single ovum per capsule, but their capsules are distinctly smaller, and, when maintained at room temperature for 5 to 8 days, eggs hatch into free-swimming, shelled-veligers. The distributions of other brackish water hydrobiids known from Florida and the Gulf of Mexico are briefly reviewed.
CRUSTACEA OF THE CAYMAN ISLANDS, BRITISH WEST INDIES. I. RECORDS OF MYSIDS FROM SHALLOW WATER NON-REEF HABITATS
W. Wayne Price1, Richard W. Heard2, Jason T. Harris3, and Croy M.R. McCoy4
1Department of Biology, University of Tampa, Tampa, Florida 33606, USA.
Phone: 813-253-3333, E-mail: email@example.com
2The University of Southern Mississippi, College of Marine Sciences,
703 East Beach Drive, Ocean Springs, MS 39564, USA.
Phone: 228-872-4217, E-mail: firstname.lastname@example.org
3Department of Biology, University of Illinois at Urbana-Champaign.
Urbana, Illinois 61801, USA.
Phone: 217-333-1098, E-mail: JasTHarris@aol. cam
4Department of the Environment, Natural Resources Laboratory,
P.O. 486GT, Georgetown, Grand Cayman, Cayman Islands, British West Indies.
Phone: 345- 949-2557, E-mail: Croy.McCoy@gov.ky
ABSTRACT A single species of mysid Siriella chierchiae has been previously reported from the Cayman Islands. However, between May 1995 and August 1999, 20 species of mysids were collected from shallow water non-reef habitats surrounding Grand Cayman and Little Cayman Islands. Of the species collected, one species Anchialina typica has a cosmopolitan distribution in tropical and subtropical seas. Thirteen species (Amathimysis cherados, A. gibba, Bowmaniella johnsoni, Dioptromysis paucispinosa, Heteromysis bermudensis, H. mayana, Mysidium columbiae, M. gracile, M. integrum, Mysidopsis bispinulata, M. brattstromi, Parvimysis bahamensis, Siriella chierchiae) are found widely distributed throughout the subtropical and tropical waters of the Northwest Atlantic. Four species (Heteromysis coralina, Mysidopsis mathewsoni, Siriella chessi, S. macrophthalma) previously known only from their type localities are reported, and two undescribed species of Heteromysis, one from Little Cayman Island, and one from Grand Cayman Island, are recognized.
TANAIDACEA (CRUSTACEA: PERACARIDA) OF THE GULF OF MEXICO. X. THE QUESTION OF BEING MALE
Department of Oceanography, Texas A&M University 3146,
College Station, Texas 77843-3146, USA
Phone: 979-845-4092. E-mail: email@example.com
ABSTRACT Three new species, Parafilitanais mexicana, Collettea elongata, and Paragathotanais medius are described from deep-sea localities in the Gulf of Mexico. The male of Parafilitanais does not vary conspicuously from the female, except for possessing pleopods. Male Paragathotanais reveal that the mouthparts display some degree of sexual dimorphism. Males of all 3 species possess functional mouthparts. The problems identifying male Tanaidacea are discussed. The number of terminal spiniform setae on the maxillule is considered invalid as a diagnostic character. Keys to the species of Parafilitanais and Paragathotanais are given.
TANAPSEUDES GUTUI, A NEW SPECIES OF APSEUDOMORPHAN TANAIDACEA (CRUSTACEA: PERACARIDA) FROM THE CARIBBEAN SEA AND THE TAXONOMIC STATUS OF THE FAMILY TANAPSEUDIDAE BACESCU, 1978
Thomas Hansknecht1, Richard W. Heard2, and Roger Bamber3
1Barry A. Vittor and Associates,
8060 Cottage Hill Road, Mobile, Alabama 36695. USA.
2Department of Coastal Sciences, College of Marine Sciences,
The University of Southern Mississippi,
703 East Beach Drive, Ocean Springs, MS 39564, USA.
3Department of Zoology, The Natural History Museum,
Cromwell Rd. London SW7 5BD, UK.
ABSTRACT Tanapseudes gutui. n. sp., is described from depths of 3-34 m off San Juan, Puerto Rico, and 4-5 m off Goat Island, Tobago. Tanapseudes sinensis Bamber from Hong Kong waters is re-examined and determined to represent a junior synonym of the type species T. ormuzana Bacescu which was originally collected in the Straights of Hormuz off Iran. Tanapseudes gutui can be distinguished from T. ormuzana by several characters including details of the mouth parts, the presence of a reduced spiniform seta on the distotergal margin of the propodus of pereopod I , pereonites 3-6 with rounded anterior margins, and a pleotelson lacking a mid-lateral lobe. A neotype is established for T. ormuzana based on a specimen collected from near the original type locality, and its mouth parts and pereopod I are illustrated. Largely based on the absence of a palp on the maxillule and the presence of a bifurcate seta on the dactyl of pereopod I , the family Tanapseudidae Bacescu is now considered a subfamily within the family Kalliapseudidae Lang sensu Gutu. The genus Paradoxapseudes Gutu. formerly within the family Tanapseudidae sensu Gutu, is tentatively transferred to the family Apseudidae Leach.
FIRST RECORD AND HABITAT NOTES FOR THE GENUS LIGHTIELLA (CRUSTACEA, CEPHALOCARIDA, HUTCHINSONIELLIDAE) FROM THE BRITISH VIRGIN ISLANDS
Joel W. Martin1, Donald B. Cadien2, and Todd L. Zimmerman1,3
1Natural History Museum of Los Angeles County,
900 Exposition Boulevard, Los Angeles, California 90007, USA.
2Marine Biology Laboratory, County Sanitation Districts of Los Angeles County,
24501 South Figueroa Street, Carson, California 90745, USA.
3Department of Organismic Biology, Evolution and Ecology,
University of California, Los Angeles,
405 Hilgard Avenue, Los Angeles, California 90024-1606, USA.