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Articles 1471 - 1500 of 1781

Full-Text Articles in Life Sciences

Spatio-Temporal Distribution Of Larval Gobiosoma Bosc In Waters Adjacent To Natural And Altered Marsh-Edge Habitats Of Mississippi Coastal Waters, J. Read Hendon, Mark S. Peterson, Bruce H. Comyns Jan 2000

Spatio-Temporal Distribution Of Larval Gobiosoma Bosc In Waters Adjacent To Natural And Altered Marsh-Edge Habitats Of Mississippi Coastal Waters, J. Read Hendon, Mark S. Peterson, Bruce H. Comyns

Faculty Publications

Larval naked gobies, Gobiosoma bose, were collected monthly from October 1995 to September 1997 by beam plankton trawl from waters adjacent to natural Juncus/Spartina marsh-edge, natural sandy beach and altered Juncus/Spartina marsh-edge habitats in Mississippi coastal waters. Altered marsh habitats consisted of two bulkheaded stations and one stretch of riprap. Abundances were significantly higher in waters adjacent to natural marsh-edge habitats than in those adjacent to altered habitats in year one (P = 0.011), suggesting that the physical nature of alteration may have caused reduced habitat suitability. Abundances also varied seasonally, with summer conditions of high water temperature, increasing tide …

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Fecundity Of Litopenaeus Setiferus, Farfantepenaeus Aztecus And F. Duorarum, In The Southwestern Gulf Of Mexico, Martin Perez Velazquez, Adolfo Gracia Jan 2000

Fecundity Of Litopenaeus Setiferus, Farfantepenaeus Aztecus And F. Duorarum, In The Southwestern Gulf Of Mexico, Martin Perez Velazquez, Adolfo Gracia

Gulf and Caribbean Research

Fecundity of white shrimp, Litopenaeus setiferus, brown shrimp, Farfantepenaeus aztecus, and pink shrimp F. duorarum and relationships to gonad weights and total and carapace length were estimated. Ovigerous females were collected in the southern Gulf of Mexico in February, May, August and November 1993. Fecundity was estimated by means of a gravimetric method. The equations relating fecundity to total weight and fecundity to gonad weight were linear in the 3 species. However, an exponential relationship was found between fecundity and carapace length in L. setiferus and F. aztecus. Of the relationships examined, gonad weight was considered a …

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Feeding Habits Of Juvenile Lane Snapper Lutjanus Synagris From Mississippi Coastal Waters, With Comments On The Diet Of Gray Snapper Lutjanus Griseus, James S. Franks, Katherine E. Vanderkooy Jan 2000

Feeding Habits Of Juvenile Lane Snapper Lutjanus Synagris From Mississippi Coastal Waters, With Comments On The Diet Of Gray Snapper Lutjanus Griseus, James S. Franks, Katherine E. Vanderkooy

Gulf and Caribbean Research

Stomach contents analysis was used to quantitatively describe the diets of juvenile lane snapper, Lutjanus synagris, and juvenile gray snapper, Lutjanus griseus, from the northern Gulf of Mexico. Juvenile snapper were collected by trawling at two estuarine, deep channel sites in Mississippi coastal waters from September 1996 to January 1997. Lane snapper (n = 53) and gray snapper (n = 12) both consumed a variety of prey organisms, but primary prey were amphipods, decapods (shrimp and crabs), and fishes. The most important prey items for lane snapper based on percent Index of Relative Importance (%IRI) were shrimp remains …

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Possible Sustained Effects Of Hurricanes Opal And Erin On The Macrobenthos Of Nearshore Habitats Within The Gulf Islands National Seashore, Chet F. Rakocinski, Sara E. Lecroy, Jerry A. Mclelland, Richard W. Heard Jan 2000

Possible Sustained Effects Of Hurricanes Opal And Erin On The Macrobenthos Of Nearshore Habitats Within The Gulf Islands National Seashore, Chet F. Rakocinski, Sara E. Lecroy, Jerry A. Mclelland, Richard W. Heard

Gulf and Caribbean Research

Possible sustained effects of hurricanes Opal and Erin on the macrobenthos of nearshore habitats of the Florida district of Gulf Islands National Seashore were assessed. Pre-hurricane macrobenthic data originating mainly from a large-scale faunal inventory conducted during 1993 were compared with posthurricane data collected one year after the 1995 disturbances. Nearshore habitats examined included both exposed and protected sand beaches, as well as grassbed and lagoon sites. Within one year after the hurricanes, few faunal effects could be discerned at exposed beach sites, whereas possible faunal effects were apparent in protected nearshore habitats. Abundances of 4 major epifaunal crustacean taxa …

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The South American Neritic Copepod Ctenocalanus Heronae Vega-Pérez And Bowman (Calanoida) In The Gulf Of Mexico, With Comments On The Taxonomy Of The Genus, E. Suarez-Morales, A. Leon-Oropeza Jan 2000

The South American Neritic Copepod Ctenocalanus Heronae Vega-Pérez And Bowman (Calanoida) In The Gulf Of Mexico, With Comments On The Taxonomy Of The Genus, E. Suarez-Morales, A. Leon-Oropeza

Gulf and Caribbean Research

A single adult female specimen of the calanoid copepod Ctenocalanus heronaeVega-Pérez and Bowman was collected during a zooplankton survey carried out in February 1997 in Campeche Sound, the central-southeastern portion of the Gulf of Mexico. The taxonomy of the genus Ctenocalanus Giesbrecht is still unclear. Characters used to separate the species have been considered rather subtle. In this paper the taxonomic illustrations of the specimen collected are accompanied by a revision of the taxonomic features commonly used to identify the species. New, previously overlooked characters such as the cephalosome/urosome ratio, the shape of the 5th legs and particularly the …

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Relationship Between Pea Crab (Pinnotheres Maculatus) Parasitism And Gonad Mass Of The Bay Scallop (Argopecten Irradians), Paul A.X. Bologna, Kenneth L. Heck Jr. Jan 2000

Relationship Between Pea Crab (Pinnotheres Maculatus) Parasitism And Gonad Mass Of The Bay Scallop (Argopecten Irradians), Paul A.X. Bologna, Kenneth L. Heck Jr.

Gulf and Caribbean Research

We investigated the prevalence of pea crabs (Pinnotheres maculatus) in bay scallops (Argopecten irradians) from 1994 through 1996 in a scallop population from St. Joseph Bay, Florida. We also assessed their impacts on scallop reproductive potential. Our results showed that prevalence in bay scallops varied between 0 and 20% and were extremely low during 1996 (<2%). Comparing Gonadal-Somatic Indices (GSI) between infested and non-infested bay scallops in samples assessed the impact of pinnotherid parasitism. Results showed that GSI was significantly reduced in infested individuals compared to non-infested individuals of the same size range (t12 = 2.3, P <0.04). These results suggest that P. maculatus infestation may lower the reproductive potential of individual scallops, but the low rates of parasitism may only minimally impact the host population.

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Comments On "On The Utility And Disutility Of Jebar" - Reply, Mark A. Cane, Vladimir M. Kamenkovich Aug 1999

Comments On "On The Utility And Disutility Of Jebar" - Reply, Mark A. Cane, Vladimir M. Kamenkovich

Faculty Publications

No abstract provided.

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Blue Crab Larval Dispersion And Retention In The Mississippi Bight, Donald R. Johnson, Harriet M. Perry Jul 1999

Blue Crab Larval Dispersion And Retention In The Mississippi Bight, Donald R. Johnson, Harriet M. Perry

Faculty Publications

A conceptual hypothesis relating physical forcing to dispersion and retention was developed for blue crab larvae within the Mississippi Eight. The spawning period for blue crabs in the northern Gulf of Mexico is protracted. Hatching of eggs occurs near the barrier islands and mouths of coastal bays from March through October. Larvae are released on ebbing tides and spend the next 30 to 50 d offshore where they develop through seven zoeal stages before undergoing metamorphosis to megalopae. Duration of the megalopal stage is variable but generally persists from 6 to 20 d. Blue crabs recruit to Gulf estuaries as …

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Age And Growth Of Cobia, Rachycentron Canadum, From The Northeastern Gulf Of Mexico, James S. Franks, James R. Warren, Michael V. Buchanan Jul 1999

Age And Growth Of Cobia, Rachycentron Canadum, From The Northeastern Gulf Of Mexico, James S. Franks, James R. Warren, Michael V. Buchanan

Faculty Publications

We examined 1005 cobia, Rachycentron canadum, from recreational catches in the northeastern Gulf of Mexico from 1987 to 1995. Specimens ranged from 325 to 1651 mm fork length (FL); females had a mean FL of 1050 mm (n=730) and were significantly larger than males that had a mean FL of 952 mm (n=275). The over all male to female ratio was 1:2.7. Ages of 565 cobia were estimated from thin-sectioned otoliths (sagittae). Marginal-increment analysis of sagittal otoliths showed a single annual minimum during June. Male cobia (n=170; 525-1330 mm FL) ranged from age 0 to 9, and females (n=395; 493-1651 …

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Local Data Assimilation In The Estimation Of Barotropic And Baroclinic Open Boundary Conditions, Igor Shulman, James K. Lewis, John G. Mayer Jun 1999

Local Data Assimilation In The Estimation Of Barotropic And Baroclinic Open Boundary Conditions, Igor Shulman, James K. Lewis, John G. Mayer

Faculty Publications

The problem of data assimilation in the specification of open boundary conditions for limited area models is addressed in this paper. Optimization approaches are detailed, which are based on combining available data on an open boundary with the physics of the hydrodynamical model. In our case the physics is in terms of the flux of energy through the open boundary. These optimized boundary conditions, for both barotropic and baroclinic situations, interpreted physically as special Linearizations of the Bernoulli equation for each normal mode. Because of the complexity of decomposing variables into normal modes for open boundaries with varying bathymetry, we …

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The Winogradsky Column & Biofilms: Models For Teaching Nutrient Cycling & Succession In An Ecosystem, Delia Castro Anderson, Rosalina V. Hairston Jun 1999

The Winogradsky Column & Biofilms: Models For Teaching Nutrient Cycling & Succession In An Ecosystem, Delia Castro Anderson, Rosalina V. Hairston

Faculty Publications

No abstract provided.

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Particle Fluxes During Austral Spring And Summer In The Southern Ross Sea, Antarctica, Vernon L. Asper, Walker O. Smith Jr. Mar 1999

Particle Fluxes During Austral Spring And Summer In The Southern Ross Sea, Antarctica, Vernon L. Asper, Walker O. Smith Jr.

Faculty Publications

The flux of particles from the euphotic zone through 200 m was investigated on the Ross Sea continental shelf during two cruises, the first in November-December 1994 and the second in December 1995 and January 1996. An assessment of surface layer phytoplankton biomass and productivity was made simultaneously. Particle flux was measured using floating sediment traps whose collection efficiency was assessed rigorously. Phytoplankton biomass and productivity increased rapidly in November-December, and biomass was maximal in mid-December. Thereafter productivity appeared to decline substantially. Biomass declined as well, but mot as rapidly as productivity. Vertical flux rates were low early in the …

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Gordon Pennington Gunter, 1909-1998, W. David Burke Jan 1999

Gordon Pennington Gunter, 1909-1998, W. David Burke

Gulf and Caribbean Research

Memorial of Gordon Gunter, former director of the Gulf Coast Research Laboratory and the first editor of Gulf Research Reports.

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Variations In The Ventral Ciliature Of The Crustacean Symbiont Hyalophysa (Ciliophora, Apostomatida) From Mobile Bay And Dauphin Island, Alabama, Stephen C. Landers, Michael A. Zimlich, Tom Coate Jan 1999

Variations In The Ventral Ciliature Of The Crustacean Symbiont Hyalophysa (Ciliophora, Apostomatida) From Mobile Bay And Dauphin Island, Alabama, Stephen C. Landers, Michael A. Zimlich, Tom Coate

Gulf and Caribbean Research

Apostome ciliates are symbiotic organisms whose life cycles are complex and involve specific feeding, divisional, migratory, and phoretic stages. In this study we examined apostome trophonts (the diagnostic stage) from a variety of crustacean hosts in the Mobile Bay and Dauphin Island, Alabama, area. The hosts were grass shrimp (Palaemonetes pugio and P. paludosus), striped hermit crab (Clibanarius vittatus), blue crab (Callinectes sapidus), and pink shrimp (Farfantepenaeus (=Penaeus) duorarum). A number of similar but distinct morphotypes of apostomes were present, those corresponding to descriptions of species of Hyalophysa as well …

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Effects Of Diflubenzeron On The Ontogeny Of Phototaxis By Palaemonetes Pugio, J.E.H. Wilson, R.B. Forward Jr., J.D. Costlow Jan 1999

Effects Of Diflubenzeron On The Ontogeny Of Phototaxis By Palaemonetes Pugio, J.E.H. Wilson, R.B. Forward Jr., J.D. Costlow

Gulf and Caribbean Research

The phototaxis by larvae of the grass shrimp Palaemonetes pugio that hatched from embryos which were exposed to a single pulse concentration of diflubenzuron (DFB; Dimilin®) was quantified. Stage IV embryos (6-day-old) were exposed to 0.5 µg/L of DFB for 4 days followed by transfer into clean seawater for the rest of the incubation period. The photoresponses of light-adapted larvae from untreated embryos and embryos treated with 0.5 µg/L DFB were monitored from 1 day through 8 day post hatch for phototactic responses to 500 nm light. Larvae from untreated embryos exhibited strong positive phototaxis at high light intensities (3 …

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A Survey Of The Reef-Related Medusa (Cnidaria) Community In The Western Caribbean Sea, E. Suarez-Morales, L. Segura-Puertas, R. Gasca Jan 1999

A Survey Of The Reef-Related Medusa (Cnidaria) Community In The Western Caribbean Sea, E. Suarez-Morales, L. Segura-Puertas, R. Gasca

Gulf and Caribbean Research

The species composition, distribution, and abundance of medusae collected during a 4-day plankton survey in a reef system of the Mexican Caribbean were studied. Highest mean medusae abundance was observed over the fore-reef zone and in daytime samples. Lowest abundances occurred in the reef lagoon and at dusk. Seventeen species were identified, with Liriope tetraphylla, Aglaura hemistoma, Cubaia aphrodite, and Sarsia prolifera being the most abundant. They belong to a group of medusae dominant along the world's second largest barrier reef. Cluster analysis revealed primary (fore-reef) and secondary (reef lagoon, channel) oceanic groups, showing the strong oceanic …

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An Annotated Checklist And Key To Hermit Crabs Of Tampa Bay, Florida, And Surrounding Waters, Karen M. Strasser, W. Wayne Price Jan 1999

An Annotated Checklist And Key To Hermit Crabs Of Tampa Bay, Florida, And Surrounding Waters, Karen M. Strasser, W. Wayne Price

Gulf and Caribbean Research

Fourteen species of hermit crabs, belonging to 5 genera, were identified from 35 stations in Tampa Bay and adjacent continental shelf waters. Ninety-two samples were taken from the intertidal zone to 15 m with a variety of gear including dip nets, trawls, dredges, and hand collections using SCUBA. Pagurus maclaughlinae, Pagurus longicarpus, and Pagurus pollicaris were distributed throughout the bay. These species were often sympatric, and were commonly found in seagrass beds, sandy substrates, and sand/mud substrates, respectively. Clibanarius vittatus, Pagurus gymnodactylus, and Pagurus stimpsoni inhabited the higher salinity waters of the bay entrance. Paguristes sp., …

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The Planktonic Copepods Of Coastal Saline Ponds Of The Cayman Islands With Special Reference To The Occurrence Of Mesocyclops Ogunnus Onabamiro, An Apparently Introduced Afro-Asian Cyclopoid, Eduardo Suarez-Morales, Jerry A. Mclelland, Janet Reid Jan 1999

The Planktonic Copepods Of Coastal Saline Ponds Of The Cayman Islands With Special Reference To The Occurrence Of Mesocyclops Ogunnus Onabamiro, An Apparently Introduced Afro-Asian Cyclopoid, Eduardo Suarez-Morales, Jerry A. Mclelland, Janet Reid

Gulf and Caribbean Research

Taxonomic analysis of the copepod specimens collected from 29 Cayman Island ponds revealed the presence of ten species including the nearly ubiquitous cyclopoid Apocyclops panamensis. This species was widespread throughout the islands, being collected at 27 of the sampling sites. Another common calanoid, Mastigodiaptomus nesus, occurred at nine sites on Grand Cayman and one on Cayman Brac. A cyclopoid of Afro-Asian origin, Mesocyclops ogunnus, was collected at two nearly fresh water sites on Grand Cayman and was considered to be a recent introduction. Because of its known adaptability to fluctuating environmental conditions, it is likely that M. …

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Gulf Estuarine Research Society Spring 1999 Meeting Abstracts Jan 1999

Gulf Estuarine Research Society Spring 1999 Meeting Abstracts

Gulf and Caribbean Research

Meeting abstracts from the Spring 1999 meeting of the Gulf Estuarine Research Society.

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Atlas Of Fishes Of The St. Louis Bay Drainage In Southern Mississippi, Royal D. Suttkus, David A. White, Maurice F. Mettee Jan 1999

Atlas Of Fishes Of The St. Louis Bay Drainage In Southern Mississippi, Royal D. Suttkus, David A. White, Maurice F. Mettee

Gulf and Caribbean Research

This atlas presents a comprehensive report on fishes collected in the St. Louis Bay drainage between October 1950 and October 1989, prior to several recent years of accelerated commercial and residential development. A total of 261 samples taken at 126 sites from headwaters of major streams to the mouth of St. Louis Bay resulted in the collection of 75,625 specimens representing 124 species plus 2 hybrid sunfish combinations. Precise locality data are given for each collection site, with number of species and specimens taken at each site, followed by a total list of species taken at each site. A distribution …

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Recent Trends In Water Clarity Of Lake Pontchartrain, J.C. Francis, M.A. Poirrier Jan 1999

Recent Trends In Water Clarity Of Lake Pontchartrain, J.C. Francis, M.A. Poirrier

Gulf and Caribbean Research

An analysis of Secchi disk transparency observations from 3 sites on the Lake Pontchartrain Causeway indicates that water clarity has increased at the north shore and mid-lake sites, but has not changed at the south shore site. Louisiana Department of Environmental Quality data from 1986 through 1995 were used in the analysis. Further analysis indicates that the increased transparency was not caused by changes in salinity or wind speed. The best explanation for the observed increase is the cessation of shell dredging in 1990.

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Parasitization Of Callinectes Rathbunae And Callinectes Sapidus By The Rhizocephalan Barnacle Loxothylacus Texanus In Alvarado Lagoon, Veracruz, Mexico, Fernando Alvarez, Adolfo Gracia, Rafael Robles, Jorge Calderon Jan 1999

Parasitization Of Callinectes Rathbunae And Callinectes Sapidus By The Rhizocephalan Barnacle Loxothylacus Texanus In Alvarado Lagoon, Veracruz, Mexico, Fernando Alvarez, Adolfo Gracia, Rafael Robles, Jorge Calderon

Gulf and Caribbean Research

Callinectes rathbunae and CalIinectes sapidus in Alvarado Lagoon, Mexico, were sampled monthly for one year to determine the extent of parasitization by the rhizocephalan cirripede Loxothylacus texanus. Prevalence levels. host sex ratio, carapace width-weight variation, and distribution of the number of parasites among hosts were analyzed. Loxothylacus texanus was present almost exclusively in C. rathbunae with a mean prevalence of 7.58%, while less than 1% of all C. sapidus were parasitized. Callinectes rathbunae constitutes a new host record for this parasite. A study of infection revealed significant variation in prevalence and host size throughout the study period. The sex …

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Optimized Boundary Conditions And Data Assimilation With Application To The M-2 Tide In The Yellow Sea, Igor Shulman, James K. Lewis, Alan F. Blumberg, B. Nicholas Kim Aug 1998

Optimized Boundary Conditions And Data Assimilation With Application To The M-2 Tide In The Yellow Sea, Igor Shulman, James K. Lewis, Alan F. Blumberg, B. Nicholas Kim

Faculty Publications

An optimization approach is derived for assimilating tidal height information along the open boundaries of a numerical model. The approach is then extended so that similar data along transects inside a model domain can also be optimally assimilated. To test the application of such an optimized methodology, M-2 tidal simulations were conducted with a numerical ocean model of the Yellow Sea, an area with a strong tidal influence. The use of the optimized open boundary conditions and internal data assimilation leads to a significant improvement of the predictive skill of the model. Average errors can be reduced by up to …

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On The Utility And Disutility Of Jebar, Mark A. Cane, Vladimir M. Kamenkovich, Alexander Krupitsky Mar 1998

On The Utility And Disutility Of Jebar, Mark A. Cane, Vladimir M. Kamenkovich, Alexander Krupitsky

Faculty Publications

The usefulness of the concept of JEBAR, the joint effect of baroclinicity and relief, in large-scale ocean dynamics is critically analyzed. The authors address two questions. Does the JEBAR term properly characterize the joint impact of stratification and bottom topography on the ocean circulation? Do estimates of the JEBAR term from observational data allow reliable diagnostic calculations? The authors give a negative answer to the first question. The JEBAR term need not give a true measure of the effect of bottom relief in a stratified ocean. A simple two-layer model provides examples. As to the second question, it is demonstrated …

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Gulf Coast Research Laboratory: A Mississippi Academy, Linda Skupien, Joyce M. Shaw Jan 1998

Gulf Coast Research Laboratory: A Mississippi Academy, Linda Skupien, Joyce M. Shaw

Gulf and Caribbean Research

A brief overview of the creation and growth of the Gulf Coast Research Laboratory, this article traces the institution’s history and its strong relationship with the Mississippi Academy of Sciences. The Mississippi Academy of Sciences officially dedicated the Gulf Coast Research Laboratory (GCRL) with the opening of the first summer session at Magnolia State Park in Ocean Springs, Mississippi, on August 28, 1947. Mississippians in scientific and educational circles had worked for two decades toward creating a research and educational laboratory focused on the state’s marine and coastal environments. The Academy’s priorities were scholarly research and education. Political leaders were …

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Food Habits And Dietary Overlap Of Newly Settled Red Drum (Sciaenops Ocellatus) And Atlantic Croaker (Micropogonias Undulatus) From Texas Seagrass Meadows, M. Andres Soto, G. Joan Holt, Scott A. Holt, Jay Rooker Jan 1998

Food Habits And Dietary Overlap Of Newly Settled Red Drum (Sciaenops Ocellatus) And Atlantic Croaker (Micropogonias Undulatus) From Texas Seagrass Meadows, M. Andres Soto, G. Joan Holt, Scott A. Holt, Jay Rooker

Gulf and Caribbean Research

Food habits and dietary overlap of newly settled larval and juvenile red drum and Atlantic croaker were examined during the period when the two species co-occur in seagrass nurseries. A total of 274 red drum (4.00 - 19.99 mm SL) and 205 Atlantic croaker (8.00 - 17.99 mm SL) were used for this analysis. Of the red drum stomachs examined, 8.4% were empty while 28.8% of Atlantic croaker stomachs contained no food. Major prey items identified for both species were calanoid copepods, harpacticoid copepods and mysid shrimp across all size classes. Ontogenetic trophic niche shifts were detected for red drum …

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Feeding Of Sciaenid (Pisces: Sciaenidae) Larvae In Two Coastal Lagoons Of The Gulf Of Mexico, Alberto Ocana-Luna, Marina Sanchez-Ramirez Jan 1998

Feeding Of Sciaenid (Pisces: Sciaenidae) Larvae In Two Coastal Lagoons Of The Gulf Of Mexico, Alberto Ocana-Luna, Marina Sanchez-Ramirez

Gulf and Caribbean Research

Stomach contents analyses showed that Leiostomus xanthurus (8.50-12.90 mm SL) had a wide trophic spectrum (15 food categories) with copepods and eggs of invertebrates as main components. In contrast, Micropogonias undulutus (6.65-12.20 mm SL) ingested only six food categories (copepods, eggs of invertebrates, crustacean nauplii, bamacle nauplii, amphipods and other crustaceans). There is an overlap of 73.2 to 83.0% in the diet of these two species. Bairdiella chrysoura (1.17-1.92 mm SL) fed primarily on juvenile pelecypods, crustacean nauplii, eggs of invertebrates, including gasteropods and copepods. Cynoscion nebulosus (1.50-2.42 mm SL) ingested juvenile pelecypods, copepods, crustacean nauplii, eggs of invertebrates and …

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Effects Of The Burrowing Brittlestar, Microphiopholis Gracillima (Echinodermata: Ophiuroidea), On The Flux Of Lithium, An Inert Tracer, Across The Sediment-Water Interface, Timothy H. Shepherd, Stephen E. Stancyk, Timothy J. Shaw Jan 1998

Effects Of The Burrowing Brittlestar, Microphiopholis Gracillima (Echinodermata: Ophiuroidea), On The Flux Of Lithium, An Inert Tracer, Across The Sediment-Water Interface, Timothy H. Shepherd, Stephen E. Stancyk, Timothy J. Shaw

Gulf and Caribbean Research

Burrowing and ventilation activities of infaunal organisms have been shown to affect geochemical processes in sediments and at the sediment-water interface. Although burrowing brittlestars are dominant in many benthic environments, their role in these processes is poorly known. We tested the effect of the amphiurid brittlestar, Microphiopholis gracillima, on the flux of lithium ion from the sediment to the overlying water by using sediment cores with false bottoms for continuous flow of a Li+1-seawater solution. Brittlestars at densities of 300 and 600 individuals m-2 caused a twofold increase in the rate that Li was transported through …

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Gulf Estuarine Research Society Spring 1998 Meeting Abstracts Jan 1998

Gulf Estuarine Research Society Spring 1998 Meeting Abstracts

Gulf and Caribbean Research

The following abstracts were received by January 5,1998; and these papers will be presented at the meeting by authors whose names are underlined. Special presentations also will be given by Harold Stevenson (Publishing and the Editorial Process of Estuaries), Chris D'Elia (Federal Budgeting and Success in the Grant Process), and Gene Turner (Estuarine Signatures for the Gulf of Mexico).

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Occurrence Of A Synchronous Hermaphroditic Striped Mullet, Mugil Cephalus, From The Northern Gulf Of Mexico, James S. Franks, Nancy J. Brown-Peterson, Dyan P. Wilson, Ronda J. Russell, Janaith K. Welker Jan 1998

Occurrence Of A Synchronous Hermaphroditic Striped Mullet, Mugil Cephalus, From The Northern Gulf Of Mexico, James S. Franks, Nancy J. Brown-Peterson, Dyan P. Wilson, Ronda J. Russell, Janaith K. Welker

Gulf and Caribbean Research

A synchronous hermaphroditic striped mullet, Mugil cephalus, was captured offshore of Southwest Pass, Louisiana on 6 December 1996 during the commercial roe mullet fishery harvest. The fish measured 412 mm FL, weighed 824 g and was determined to be 4 years old by otolith analysis. Gross examination of the gonads revealed four lobes: right and left ovaries and right and left testis which represents a unique occurrence among hermaphroditic fish. All lobes ended in a common sperm duct/oviduct with the exception of the left ovary which had no oviduct. Both ovaries contained vitellogenic oocytes and both testis had freely …

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