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Articles 421 - 450 of 883
Full-Text Articles in Marine Biology
Relative Abundance Of Pelagic Sharks In The Western North Atlantic Ocean, Including The Gulf Of Mexico And Caribbean Sea, Enric Cortes, Craig A. Brown, Lawrence R. Beerkircher
Relative Abundance Of Pelagic Sharks In The Western North Atlantic Ocean, Including The Gulf Of Mexico And Caribbean Sea, Enric Cortes, Craig A. Brown, Lawrence R. Beerkircher
Gulf and Caribbean Research
Little information exists on the status of pelagic shark populations in the Atlantic Ocean, especially in the Gulf of Mexico and Caribbean Sea. We derived indices of relative abundance for pelagic sharks based on mandatory logbooks and observer reports from a scientific observer program of the United States (US) pelagic longline fleet. Time series data from the pelagic longline logbook program (1986-2005) and the pelagic longline observer program (1992-2005) were standardized with Generalized Linear Model (GLM) procedures. Declines in relative abundance for the 6 pelagic shark species or genera examined in the logbook data analysis ranged from 43% for mako …
Large Pelagic Fishes In The Wider Caribbean And Northwest Atlantic Ocean: Movement Patterns Determined From Conventional And Electronic Tagging, Brian E. Luckhurst
Large Pelagic Fishes In The Wider Caribbean And Northwest Atlantic Ocean: Movement Patterns Determined From Conventional And Electronic Tagging, Brian E. Luckhurst
Gulf and Caribbean Research
Conventional tagging data has documented long distance movements (including trans-Atlantic movements) in blue marlin (Makaira nigricans) and yellowfin tuna (Thunnus albacares) within the Atlantic. Swordfish (Xiphius gladius) have also been shown to move substantial distances, although primarily in a north-south direction. There is, however, a paucity of data for wahoo (Acanthocybium solandri). In the past several years, electronic archival (i.e., data recording) tags have significantly advanced our understanding of the behavior and movement patterns of large pelagic fishes. Data from electronic arcltival tags have generally corroborated conventional tagging data with respect to …
A History Of Change And Reorganization: The Pelagic Longline Fishery In Gouyave, Grenada, Sandra Grant, Fikret Berkes, Johnson St. Louis
A History Of Change And Reorganization: The Pelagic Longline Fishery In Gouyave, Grenada, Sandra Grant, Fikret Berkes, Johnson St. Louis
Gulf and Caribbean Research
This paper traces the history of the pelagic surface longline fishery in Gouyave, Grenada, noting 4 major periods of change from pre-1985 to 2004. Reconstructed from document reviews, newspaper articles, oral history, and key informant interviews 1) the pre-1985 period was the time when the longline was introduced and popularized by the Cubans, 2) the period of institutionalization and technology development (1986-1990) corresponded to the strengthening of institutional arrangements and the initial improvements in technology, 3) the Coastal Fisheries Development Project (CFDP) of 1991-1999 was the period of international donor support and further technology change in longline construction, and finally …
Management In The Gulf And Caribbean: Mosaic Or Melting Pot?, Patrick Mcconney, Hazel A. Oxenford, Milton Haughton
Management In The Gulf And Caribbean: Mosaic Or Melting Pot?, Patrick Mcconney, Hazel A. Oxenford, Milton Haughton
Gulf and Caribbean Research
Does ''managing large pelagic fishes" mean the same thing across the diversity of maritime jurisdictions, governance arrangements, economies, languages, cultures, scales of operation and other features of the Gulf and Caribbean region? It would be surprising if it did. Yet international fisheries management urges this mosaic of management to become a melting pot; at least integrated, even if differentiated. This paper examines some themes underlying whether a mosaic or melting pot is the most apt metaphor for where we are, and are headed, in attempts to manage large pelagic fishes in the region. We pay particular attention to the multi-dimensional …
Cframp's Large Pelagic Fish Tagging Program, Susan Singh-Renton, John Renton
Cframp's Large Pelagic Fish Tagging Program, Susan Singh-Renton, John Renton
Gulf and Caribbean Research
CFRAMP's Large Pelagic Fish Tagging Program was established to examine the distribution and movement patterns of Thunnus atlanticus (blackfin tuna), Acanthocybium solandri (wahoo), Coryphaena hippurus (dolphinfish), and Scomberomorus cavalla (king mackerel), large pelagic fish species of commercial importance to several Caribbean countries. The Program explored several means to facilitate fish tag and release activities, involving collaborative partnerships with national fisheries administrations, the recreational fishing sector, and individual commercial fishers. A Iotal of 1,143 fish were tagged and released in the coastal waters of several islands within the Eastern Caribbean: 787 blackfin tuna, 250 wahoo, 89 dolphinfish, and 17 king mackerel. …
Breeding Season And Molt Cycle Of The Fiddler Crab Uca Rapax (Brachyura, Ocypodidae) In A Subtropical Estuary, Brazil, South America, Daniela Da Silva Castiglioni, Maria Lucia Negreiros-Fransozo, Rosana Carina Flores Cardoso
Breeding Season And Molt Cycle Of The Fiddler Crab Uca Rapax (Brachyura, Ocypodidae) In A Subtropical Estuary, Brazil, South America, Daniela Da Silva Castiglioni, Maria Lucia Negreiros-Fransozo, Rosana Carina Flores Cardoso
Gulf and Caribbean Research
This is the first account of the breeding season and molt cycle of Uca rapax on the Brazilian coast during a one-year period (April 2001-March 2002). At 2 sites, the ltamambuca and Ubatumirim mangrove forests, 2 collectors captured crabs once a month at low tide far 15 minutes by the catch-per-unit-effort procedure, digging into the sediment and removing the crabs. The gonad-development stages of crabs of both sexes were determined by direct observation, and the molt stage was estimated from the hardness of the tegument. Crabs with developed gonads were found mostly in warmer seasons, with ovigerous females occurring mainly …
Large Pelagic Fishes In The Caribbean Sea And The Gulf Of Mexico: Current Status And Integrated Management, Mark S. Peterson, Nancy J. Brown-Peterson, James S. Franks
Large Pelagic Fishes In The Caribbean Sea And The Gulf Of Mexico: Current Status And Integrated Management, Mark S. Peterson, Nancy J. Brown-Peterson, James S. Franks
Gulf and Caribbean Research
A symposium convened on 7 November 2006 in conjunction with the 59th annual meeting of the Gulf and Caribbean Fisheries Institute in Belize City, Belize.
Distribution Of Molidae In The Northern Gulf Of Mexico, Gregory L. Fulling, Dagmar Fertl, Kevin Knight, Wayne Hoggard
Distribution Of Molidae In The Northern Gulf Of Mexico, Gregory L. Fulling, Dagmar Fertl, Kevin Knight, Wayne Hoggard
Gulf and Caribbean Research
We compiled all available sighting, stranding and bycatch data for the Family Molidae (molas) in the northern Gulf of Mexico (NGOM) to assess spatial and temporal distribution. Overall, 483 records were collected from shipboard and aerial surveys, fisheries bycatch, and strandings. Molas were recorded year-round, with a ubiquitous distribution in both nearshore and offshore waters. Ocean sunfish (Mola mola) were sighted with greatest frequency during the winter (December thru April) in sea surface temperature < 24° C. Potential reasons for increased sightings during winter may be related to the lack of a well-defined thermocline in the NGOM; the species' "basking" behavior associated with thermoregulation; and oxygen replenishment after long, deep dives to oxygen-deficient depths.
Fisheries Ecology Abstracts
Gulf and Caribbean Research
Abstracts of presentations from the Large Pelagic Fishes Symposium in Belize City, Belize during November 2006.
Growth Phases And Differential Growth Between Sexes Of Uca Maracoani Latreille, 1802-1803 (Crustacea, Brachyura, Ocypodidae), Gustavo L. Hirose, Maria L. Negreiros-Fransozo
Growth Phases And Differential Growth Between Sexes Of Uca Maracoani Latreille, 1802-1803 (Crustacea, Brachyura, Ocypodidae), Gustavo L. Hirose, Maria L. Negreiros-Fransozo
Gulf and Caribbean Research
Among crustacean decapods, fiddler crabs of the genus Uca are the most characteristic of the intertidal zones of tropical and subtropical estuaries. The present study determined the growth phases and the beginning of differential growth between the sexes, based on analyses of relative growth of Uca maracoani. Collections were made in the Jabaquara mangrove, located in Paraty, Rio de Janeiro, Brazil. Specimens were collected manually during low tide periods. In the laboratory, crabs were sexed and measured. We measured carapace width (CW), carapace length (CL), propodus length (PL; the right one for females and the major one for males), …
Habitat Use By Juvenile Gag, Mycteroperca Microlepis (Pisces: Serranidae), In Subtropical Charlotte Harbor, Florida (Usa), J. Patrick Casey, Gregg R. Poulakis, Philip W. Stevens
Habitat Use By Juvenile Gag, Mycteroperca Microlepis (Pisces: Serranidae), In Subtropical Charlotte Harbor, Florida (Usa), J. Patrick Casey, Gregg R. Poulakis, Philip W. Stevens
Gulf and Caribbean Research
Estuaries play a key role in the juvenile stage of gag (Myeteroperca microlepis). The use of estuarine habitats by juvenlle gag has been examined in temperate estuaries, which are at the northern limits of the range of this species, but the importance of subtropical estuaries during the early life history of this species has not been studied extensively. Gag were collected in subtropical Charlotte Harbor, Florida, during routine monthiy sampling from January 1996 to Decemher 2002. Juvenlle gag were collected using a 21.3-m seine, a 183-m haul seine, and a 183-m purse seine. A total of 738 individuals …
Strategic Investments In Large Pelagic Research, Nancy B. Thompson, Eric D. Prince
Strategic Investments In Large Pelagic Research, Nancy B. Thompson, Eric D. Prince
Gulf and Caribbean Research
The Southeast Fisheries Science Center (SEFSC) of the US NOAA Fisheries provides much of the US science advice for the management of Highly Migratory Species (HMS) in the Atlantic, Gulf of Mexico and US Caribbean Sea. These stocks include the tunas, sharks, billfishes and swordfish all of which are targeted either commercially or recreationally or both in US waters. These species are managed internationally through membership to the International Commission for the Conservation of Atlantic Tunas (ICCAT); however, while the US is an ICCAT member, few Caribbean nations are members.
Observations Of A Feeding Aggregation Of Whale Sharks, Rhincodon Typus, In The North Central Gulf Of Mexico, Eric R. Hoffmayer, James S. Franks, William B. Driggers Iii, Kenneth J. Oswald, Joseph M. Quattro
Observations Of A Feeding Aggregation Of Whale Sharks, Rhincodon Typus, In The North Central Gulf Of Mexico, Eric R. Hoffmayer, James S. Franks, William B. Driggers Iii, Kenneth J. Oswald, Joseph M. Quattro
Gulf and Caribbean Research
On 26 June 2006 an aggregation of 16 whale sharks was observed for a period of 4 hr in the north central Gulf of Mexico (GOM). The sharks remained within an area about 1.0 km2 in size and continuously ram filter fed at the surface. Visual analysis of a plankton sample collected from the study site revealed the presence of copious amounts of fish eggs in mid-embryonic development and a minor amount of other zooplankton. A second plankton sample (control) collected about 3.5 km from the study site in an area where no whale sharks were present contained few …
Nocturnal Depth Distribution Of Western North Atlantic Swordfish (Xiphias Gladius, Linnaeus, 1758) In Relation To Lunar Illumination, Joshua K. Loefer, George R. Sedberry, John C. Mcgovern
Nocturnal Depth Distribution Of Western North Atlantic Swordfish (Xiphias Gladius, Linnaeus, 1758) In Relation To Lunar Illumination, Joshua K. Loefer, George R. Sedberry, John C. Mcgovern
Gulf and Caribbean Research
Swordfish are known to undergo large diel vertical movements from surface waters at night to > 300 m depth during the day. Evidence presented over the past several deeades suggests the lunar cycle affects these vertical migrations. This study collected data concurrently from 7 swordfish throughout 3 consecutive lunar cycles using pop-up satellite archival tags. All individuals demonstrated an inverse relationship between recorded nocturnal depths and lunar illumination.
Genetic Analysis Of Blue Marlin (Makaira Nigricans) Stock Structure In The Atlantic Ocean, Jan R. Mcdowell, Jeanette E.L. Carlsson, John E. Graves
Genetic Analysis Of Blue Marlin (Makaira Nigricans) Stock Structure In The Atlantic Ocean, Jan R. Mcdowell, Jeanette E.L. Carlsson, John E. Graves
Gulf and Caribbean Research
The genetic basis of stock structure of blue marlin (Makaira nigricans Lacepède 1802) in the Atlantic ocean was inferred from analyses of mitochondrial control region sequences. Blue marlin were collected in 1998 from 4 major geographic locations: western North Atlantic, Caribbean Sea, western South Atlantic and eastern Atlantic. Haplotype diversity (h) ranged from 0.99-1.0 and nucleotide sequence diversity (π) ranged from 0.11-0.13 within samples indicating that the control region harbors a significant amount of genetic variation. However, no significant differences were found in the spatial partitioning of genetic variation among the 4 collections; all pairwise ϕST …
Patterns Of Vertical Habitat Use By Atlantic Blue Marlin (Makaira Nigricans) In The Gulf Of Mexico, Richard T. Kraus, Jay R. Rooker
Patterns Of Vertical Habitat Use By Atlantic Blue Marlin (Makaira Nigricans) In The Gulf Of Mexico, Richard T. Kraus, Jay R. Rooker
Gulf and Caribbean Research
We examined data from pop-up archival transmitting (PAT) tags (n = 18) to characterize aspects of vertical habitat use by blue marlin (Makaira nigricans) from the Gulf of Mexico (GOM). Two of these tags were recovered and provided fine-scale information about diving patterns and the relationship between time at depth and temperature. Similar to previous studies, blue marlin in the GOM spent most of their time at the surface and at temperatures within 3° C of surface temperatures. Time at depth was multimodal and the magnitude of the smaller modes was dependent upon the strength and depth …
Large Pelagics In The Southern Section Of The Seaflower Marine Protected Area, San Andres Archipelago, Colombia: A Fishery In Expansion, Erick Castro, Heins Bent, Carlos Ballesteros, Martha Prada
Large Pelagics In The Southern Section Of The Seaflower Marine Protected Area, San Andres Archipelago, Colombia: A Fishery In Expansion, Erick Castro, Heins Bent, Carlos Ballesteros, Martha Prada
Gulf and Caribbean Research
Isolated and sparse reef atolls comprising the southern section of the Seaflower MPA have been traditionally exploited by artisanal fishers using handlines. These practices have severely depleted the demersal fish stock and now fishers have shifted their efforts to the pelagic stock. The pelagic fishery included the extraction of more than 25 species, with Thunnus atlanticus, Acanthocybium solandri, Coryphaena hippurus, and Katsuwonus pelamis being the most common. Three years of fishery-dependent data (2004–2006) were used to describe traditional fishing methods and techniques, and to document, for the first time, a declining trend in the large pelagic stock. …
Understanding The Local Livelihood System In Resource Management: The Pelagic Longline Fishery In Gouyave, Grenada, Sandra C. Grant, Fikret Berkes, John Brierley
Understanding The Local Livelihood System In Resource Management: The Pelagic Longline Fishery In Gouyave, Grenada, Sandra C. Grant, Fikret Berkes, John Brierley
Gulf and Caribbean Research
There is a need to include social objectives in fisheries management, and this paper focuses on one set of social considerations, those regarding livelihood. We pay particular attention to sustainable livelihood strategies, the importance of commercial pelagic longline fishing for the entire community livelihood system, and implications for management. Field data were obtained between December 2002 and March 2004 in Gouyave, Grenada, using participant observation, semi-structured interviews, and a quantitative survey. The economic base (fishing and agriculture) of the community is both unpredictable and seasonal, therefore individuals and households engage in diverse strategies to secure their livelihood. Three livelihood strategies …
Whale Sharks Of The Western Caribbean: An Overview Of Current Research And Conservation Efforts And Future Needs For Effective Management Of The Species, Rachel T. Graham
Whale Sharks Of The Western Caribbean: An Overview Of Current Research And Conservation Efforts And Future Needs For Effective Management Of The Species, Rachel T. Graham
Gulf and Caribbean Research
Whale sharks (Rhincodon typus) are seasonal visitors to four sites in the Western Caribbean, 3 of which are encompassed by the Mesoamerican Barrier Reef. Predictable encounters with the world's largest fish have raised this species' profile globally and led to several research and conservation efforts that aim to elucidate the need for information for the species management and balance the growing demand for highly lucrative encounter tourism. Tagging studies have demonstrated that the whale shark population is relatively small and likely forms a single population. Individuals move throughout the region between 3 of 4 known feeding sites and …
Use Of Diadema Antillarum Spines By Juvenile Fish And Mysid Shrimp, Taryn Townsend, Paul A.X. Bologna
Use Of Diadema Antillarum Spines By Juvenile Fish And Mysid Shrimp, Taryn Townsend, Paul A.X. Bologna
Gulf and Caribbean Research
This research has the following objectives: 1) identify the size structure of D. antillarum among 3 coastal bays of St. John, United States Virgin Islands and 2) determine relationships between urchin presence and spine utilization by fish and mysid shrimp.
A Review Of Polylekithum Arnold, 1934 And Its Familial Affinities Using Morphological And Molecular Data, With Description Of Polylekithum Catahoulensis Sp Nov., Stephen S. Curran, Vasyl V. Tkach, Robin M. Overstreet
A Review Of Polylekithum Arnold, 1934 And Its Familial Affinities Using Morphological And Molecular Data, With Description Of Polylekithum Catahoulensis Sp Nov., Stephen S. Curran, Vasyl V. Tkach, Robin M. Overstreet
Faculty Publications
The type material of Polylekithum ictaluri, P. halli, and Maculifer chandleri was examined from the United States National Parasite Museum, and we determined that the material was conspecific, making P. halli and M. chandleri junior subjective synonyms of P. ictaluri. Polylekithum catahoulensis sp. nov. was described from material collected from catfishes at the Catahoula Wildlife Refuge, LaSalle Parish, Louisiana, USA, and compared with P. ictaluri collected from catfishes in Reelfoot Lake, Obion County, Tennessee, USA, and the Pearl River, Hancock County, Mississippi, USA. Polylekithum catahoulensis had smaller eggs (77–88 μm long by 51–63 μm wide vs. 94–108 μm by …
Red Tides In The Gulf Of Mexico: Where, When, And Why?, J. J. Walsh, J. K. Jolliff, B. P. Darrow, J. M. Lenes, S.P. Milroy, A. Remsen, D.A. Dieterle, K.L. Carder, F.R. Chen, F.R. Chen, G.A. Vargo, R.H. Weisberg, K.A. Fanning, F.E. Muller-Karger, E. Shinn, K.A. Steidinger, C.A. Heil, C.R. Tomas, J.S. Prospero, T.N. Lee, G.J. Kirkpatrick, T.E. Whitledge, D.A. Stockwell, T.A. Villareal, A.E. Jochens, P.S. Bontempi
Red Tides In The Gulf Of Mexico: Where, When, And Why?, J. J. Walsh, J. K. Jolliff, B. P. Darrow, J. M. Lenes, S.P. Milroy, A. Remsen, D.A. Dieterle, K.L. Carder, F.R. Chen, F.R. Chen, G.A. Vargo, R.H. Weisberg, K.A. Fanning, F.E. Muller-Karger, E. Shinn, K.A. Steidinger, C.A. Heil, C.R. Tomas, J.S. Prospero, T.N. Lee, G.J. Kirkpatrick, T.E. Whitledge, D.A. Stockwell, T.A. Villareal, A.E. Jochens, P.S. Bontempi
Faculty Publications
Independent data from the Gulf of Mexico are used to develop and test the hypothesis that the same sequence of physical and ecological events each year allows the toxic dinoflagellate Karenia brevis to become dominant. A phosphorus-rich nutrient supply initiates phytoplankton succession, once deposition events of Saharan iron-rich dust allow Trichodesmium blooms to utilize ubiquitous dissolved nitrogen gas within otherwise nitrogen-poor sea water. They and the co-occurring K. brevis are positioned within the bottom Ekman layers, as a consequence of their similar diel vertical migration patterns on the middle shelf. Upon onshore upwelling of these near-bottom seed populations to CDOM-rich …
Effects Of Long-Term Hypoxia On Enzymes Of Carbohydrate Metabolism In The Gulf Killifish, Fundulus Grandis, Mery L. Mártinez, Christie Landry, Ryan Boehm, Steve Manning, Bernard B. Rees
Effects Of Long-Term Hypoxia On Enzymes Of Carbohydrate Metabolism In The Gulf Killifish, Fundulus Grandis, Mery L. Mártinez, Christie Landry, Ryan Boehm, Steve Manning, Bernard B. Rees
Faculty Publications
The goal of the current study was to generate a comprehensive, multi-tissue perspective of the effects of chronic hypoxic exposure on carbohydrate metabolism in the Gulf killifish Fundulus grandis. Fish were held at approximately 1.3 mg l(-1) dissolved oxygen (similar to 3.6 kPa) for 4 weeks, after which maximal activities were measured for all glycolytic enzymes in four tissues (white skeletal muscle, liver, heart and brain), as well as for enzymes of glycogen metabolism (in muscle and liver) and gluconeogenesis (in liver). The specific activities of enzymes of glycolysis and glycogen metabolism were strongly suppressed by hypoxia in white skeletal …
Dissolved Gallium In The Northwest Pacific And The South And Central Atlantic Oceans: Implications For Aeolian Fe Input And A Reconsideration Of Profiles, Alan M. Shiller, Gautam Raj Bairamadgi
Dissolved Gallium In The Northwest Pacific And The South And Central Atlantic Oceans: Implications For Aeolian Fe Input And A Reconsideration Of Profiles, Alan M. Shiller, Gautam Raj Bairamadgi
Faculty Publications
[1] The distribution of dissolved gallium, a less-reactive analogue of aluminum, has the potential to reveal information about the averaged dust input to the surface ocean and to complement studies using aluminum as a tracer. New data are presented here on the distribution of dissolved Ga, including six profiles in the south and central Atlantic as well as seven shallow and two deep profiles from the northwest Pacific. The Atlantic data allow for an estimate of Ga in Antarctic Bottom Water ( similar to 25 - 30 pmol kg(-1)) and show reasonably conservative behavior in deep waters. In the northwest …
Source And Transport Of Terrigenous Organic Matter In The Upper Yukon River: Evidence From Isotope (��C-13, Δc-14, And ��N-15) Composition Of Dissolved, Colloidal, And Particulate Phases, Laodong Guo, Robie W. Macdonald
Source And Transport Of Terrigenous Organic Matter In The Upper Yukon River: Evidence From Isotope (��C-13, Δc-14, And ��N-15) Composition Of Dissolved, Colloidal, And Particulate Phases, Laodong Guo, Robie W. Macdonald
Faculty Publications
Natural organic matter was collected from the upper Yukon River and size fractionated into the (LMW-DOC), colloidal (COC, 1 kDa to 0.45 mu m) and particulate organic carbon (POC, > 0.45 mu m) phases for characterization of elemental (C and N) and isotopic (C-13, C-14 and N-15) composition to examine their sources and transport. Concentrations of total organic carbon (TOC) decreased from 3010 mu M in mid-May to 608 mu M in September, accompanying an increase in river water delta O-18 from the snowmelt to summer and early fall. COC was the predominant OC species, comprising, on average, 63 +/- 8% …
Summer Transport Estimates Of The Kamchatka Current Derived As A Variational Inverse Of Hydrophysical And Surface Drifter Data, G.G. Panteleev, P. Stabeno, V.A. Luchin, Dmitri A. Nechaev, M. Ikeda
Summer Transport Estimates Of The Kamchatka Current Derived As A Variational Inverse Of Hydrophysical And Surface Drifter Data, G.G. Panteleev, P. Stabeno, V.A. Luchin, Dmitri A. Nechaev, M. Ikeda
Faculty Publications
The quasistationary summer Bering Sea circulation is reconstructed as a variational inverse of the hydrographic and atmospheric climatologies, transport estimates through the Bering Strait, and surface drifter data. Our results indicate the splitting of the Kamchatka Current in the vicinity of the Shirshov Ridge. This branching is in agreement with independent ARGO drifter observations. It was also found, that transport of the Kamchatka Current gradually increases downstream from 14 Sv in the Olyutorsky Gulf to 24 Sv in the Kamchatka Strait, which is twice higher than previous estimates.
Vittatispora, A New Melanosporaceous Genus From Indian Soil, Preeti Chaudhary, Jinx Campbell, David L. Hawksworth, Kedarnath N. Sastry
Vittatispora, A New Melanosporaceous Genus From Indian Soil, Preeti Chaudhary, Jinx Campbell, David L. Hawksworth, Kedarnath N. Sastry
Faculty Publications
Vittatispora coorgii gen. sp. nov., isolated from soil in India, is described and illustrated. The fungus has morphological characteristics of the genera Melanospora, Sphaerodes and Syspastospora. The most striking feature is the presence of a thick hyaline ridge along the vertical axis of the lemonshaped ascospores wall. Perithecia also have a long neck composed of adhering hyphae, similar to that of Syspatospora. Phylogenetic studies on the 28S rDNA indicate it is closely related to Melanospora and Sphaerodes and belongs in the Ceratostomataceae. The new genus is based on the distinctive morphology and phylogenetic analyses. The fungus grew in culture only …
Antiestrogens Inhibit Xenoestrogen-Induced Brain Aromatase Activity But Do Not Prevent Xenoestrogen-Induced Feminization In Japanese Medaka (Oryzias Latipes), Adam J. Kuhl, Marius Brouwer
Antiestrogens Inhibit Xenoestrogen-Induced Brain Aromatase Activity But Do Not Prevent Xenoestrogen-Induced Feminization In Japanese Medaka (Oryzias Latipes), Adam J. Kuhl, Marius Brouwer
Faculty Publications
In fish, exposure to estrogen or estrogen-mimicking chemicals (xenoestrogeus)during a critical period of development can irreversibly invert sex differentiation. In medaka, a male-to-female reversal upon exposure to a xenoestrogen is accompanied by an increase in brain aromatase expression and activity. However, whether this increase is the direct cause of sex reversal is unknown. In this study we further examined the role brain aromatase plays in genesis of developmental abnormalities in response to endocrine-disrupting chemicals (EDCs). Further, the effects of a mixture of apparent antagonistic environmentally relevant EDCs on development were examined to determine if their combined actions could lessen each …
Zonal Patterns Of Delta C-13, Delta N-15 And Po-210 In The Tropical And Subtropical North Pacific, Min Chen, Laodong Guo, Qiang Ma, Yusheng Qiu, Run Zhang, E Lv, Yipu Huang
Zonal Patterns Of Delta C-13, Delta N-15 And Po-210 In The Tropical And Subtropical North Pacific, Min Chen, Laodong Guo, Qiang Ma, Yusheng Qiu, Run Zhang, E Lv, Yipu Huang
Faculty Publications
Nitrogen fixation process may supply a significant fraction of bioavailable nitrogen to surface waters, increase the oceanic sequestration of atmospheric CO2, and alter the distribution of geochemical parameters. We report a zonal pattern of delta N-15 and delta C-13 in particulate organic matter (POM), and ratios of particulate Po-210 to dissolved Po-210 along a transect through the subtropical and tropical North Pacific. Both N-15 and Po-210 signals indicated an enhanced N-2 fixation in the northwestern subtropical North Pacific. The eastward decrease of N-2 fixation along this transect testified the role of aeolian Fe and P in controlling marine N-2 fixation. …
Benthic Nutrient Flux In A Small Estuary In Northwestern Florida (Usa), Guy T. Didonato, Emile M. Lores, Michael C. Murrell, Lisa M. Smith, Jane M. Caffrey
Benthic Nutrient Flux In A Small Estuary In Northwestern Florida (Usa), Guy T. Didonato, Emile M. Lores, Michael C. Murrell, Lisa M. Smith, Jane M. Caffrey
Gulf and Caribbean Research
Benthic nutrient fluxes of ammonium (NH4+), nitrite/nitrate (NO2- + NO3-), phosphate (PO4-3), and dissolved silica (DSi) were measured in Escambia Bay, an estuary within the larger Pensacola Bay system of northwestern Florida (USA). Our study occurred during a severe drought which reduced riverine inputs to Escambia Bay. Laboratory incubations of field-collected cores were conducted on 8 dates between June and October 2000 to estimate nutrient flux, and cores were collected from locations exhibiting a range of sediment organic matter content. NH4+ flux ranged from – 48.1 to …