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- Amphipods (2)
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- Benthic marine diatoms (1)
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Articles 1 - 16 of 16
Full-Text Articles in Life Sciences
Some Plant Leaves Have Orientation-Dependent Epr And Nmr Spectra, Douglas C. Mccain, Ted C. Selig, Govindjee, John L. Markley
Some Plant Leaves Have Orientation-Dependent Epr And Nmr Spectra, Douglas C. Mccain, Ted C. Selig, Govindjee, John L. Markley
Faculty Publications
Proton nuclear magnetic resonance (1H NMR) spectra of leaves from 50 plant species were obtained at a spectrometer frequency of 470 MHz. Water present in leaf samples gives rise to characteristic spectral patterns. Most species show only one broad 1H NMR peak; however, the leaves of some plants display complex, orientation-dependent spectra in which a common three-line pattern is discerned. The pattern varies with the angle between the leaf surface and the external magnetic field. Proton relaxation measurements show the presence of at least two water compartments in the leaves. The compartments are responsible for different components …
Ultrastructure Of Rodlet Cells: Response To Cadmium Damage In The Kidney Of The Spot Leiostomus Xanthurus Lacépède, William E. Hawkins
Ultrastructure Of Rodlet Cells: Response To Cadmium Damage In The Kidney Of The Spot Leiostomus Xanthurus Lacépède, William E. Hawkins
Gulf and Caribbean Research
Rodlet cell ultrastructure was studied in normal and cadmium-damaged kidney tissues of the spot Leiostomus xanthurus, an estuarine teleost. Rodlet cells in control fish occurred in all parts of the nephron except the renal corpuscle, were oblong to pear-shaped (about 5x10 µm), and contained up to 30 rodlet bodies, a basally situated nucleus, poorly developed mitochondria, and a filamentous cortex. Desmosomes and tight junctions joined rodlet cells to kidney epithelial cells. After cadmium exposure, rodlet cells showed a range of responses from secretory stimulation to necrosis. Rodlet bodies, which were membrane-bound, club-shaped granules, were secreted by a merocrine process, …
Seedling Establishment Of Spartina Alterniflora And Spartina Patens On Dredged Materials In Texas, James W. Webb, J.D. Dodd, B.H. Koerth, A.T. Weichert
Seedling Establishment Of Spartina Alterniflora And Spartina Patens On Dredged Materials In Texas, James W. Webb, J.D. Dodd, B.H. Koerth, A.T. Weichert
Gulf and Caribbean Research
Effects of fertilizer, elevation, and tidal inundation on seedling establishment of Spartina alterniflora and Spartina patens were tested at a wave-protected sandy dredged material site, Galveston Bay, Texas. No seedlings that grew from sown seeds became established at elevations below 36 cm (msl) while the greatest number established in the upper tier. Seedlings of S. alterniflora were more numerous than S. patens in the upper and middle tiers. Naturally occurring seedlings of S. alterniflora, which apparently germinated from seeds produced on transplants in adjacent plots, established at all elevations of the site during winter. The average time of tidal …
Sexual Dimorphism In Species Of Raninoides (Brachyura: Raninidae) And The Status Of Raninidoides Schmitti Sawaya, 1944, Gary D. Goeke
Sexual Dimorphism In Species Of Raninoides (Brachyura: Raninidae) And The Status Of Raninidoides Schmitti Sawaya, 1944, Gary D. Goeke
Gulf and Caribbean Research
The frog crab Raninoides schmitti was described from São Paulo, Brazil, as closely related to R. loevis. Detailed comparison shows R. schmitti to be a junior synonym of R. loevis. Absence of information detailing sexual dimorphism of species in the genus Raninoldes contributed to the designation of a dimorphic male as a discrete taxon. Examples of sexual dimorphism within the genus Raninoides are described.
A Range Extension For Manayunkia Aestuarina (Bourne, 1883) (Polychaeta: Sabellidae) To The Gulf Coast Of The United States With A Review Of Previous Habitat Information, T. Dale Bishop
Gulf and Caribbean Research
The sabellid polychaete Manayunkia aestuarina (Bourne, 1883) is reported for the first time from the Gulf coast of the United States and from a Juncus roemerianus marsh. Individuals were collected from a brackish J. roemerianus marsh in St. Louis Bay, Mississippi, (30o22'N, 89o15'W) during the period of June 1979 to May 1980. Adults with eggs were first noted in early January and increased in number through May. Brooded young were observed from late January through May. Habitat comparisons are made between this and other North American and European populations. The present population is associated with lower …
A Review Of The Genus Clythrocerus (Brachyura: Dorippidae) In The Eastern Gulf Of Mexico With Notes On Clythrocerus Stimpsoni, Gary D. Goeke, Richard W. Heard
A Review Of The Genus Clythrocerus (Brachyura: Dorippidae) In The Eastern Gulf Of Mexico With Notes On Clythrocerus Stimpsoni, Gary D. Goeke, Richard W. Heard
Gulf and Caribbean Research
The four members of the dorippid crab genus Clythrocerus from the Gulf of Mexico are reviewed. The rediscovery of C. stimpsoni has allowed for the first description of the male of the species. Known previously only from the unique holotypic female, the rediscovery of C. stimpsoni is based on material from the same general area as the type-locality. Clythrocerus granulatus and C. perpusillus are reported for the first time from the Gulf of Mexico. The latter form was the most frequently collected species of Clythrocerus from the study area. Although no specimens of C. nitidus occurred in our samples, previous …
Amphipods Of The Family Ampeliscidae (Gammaridea). Iv. Infraspecific Variation In Ampelisca Agassizi, Gary D. Goeke, Richard W. Heard
Amphipods Of The Family Ampeliscidae (Gammaridea). Iv. Infraspecific Variation In Ampelisca Agassizi, Gary D. Goeke, Richard W. Heard
Gulf and Caribbean Research
Considerable variation noted, in Ampelisca agassizi is herein described. The variations in the shape of the basis of pereopod 7 and the carina of urosomite I are most obyious. No relationship was found with the atypical specimens and their age, associated sediment or location.
Effects Of Space Shuttle Exhaust Plumes On Gills Of Some Estuarine Fishes: A Light And Electron Microscopic Study, William E. Hawkins, Robin M. Overstreet, Mark J. Provancha
Effects Of Space Shuttle Exhaust Plumes On Gills Of Some Estuarine Fishes: A Light And Electron Microscopic Study, William E. Hawkins, Robin M. Overstreet, Mark J. Provancha
Gulf and Caribbean Research
The first few launches of the space shuttle resulted in fish kills in a lagoon near the launch site. To study this phenomenon further, sheepshead minnow (Cyprinodon variegatus), sailfin molly (Poecilia latipinna), and mosquitofish (Gambusia affinis) were exposed to the exhaust plume in buckets placed near the launch site. An open bucket provided a full exposure, a partly closed one provided an intermediate exposure, and a closed one was the control. Three h after launch, the pH of the water from the full exposure had decreased from about 7 to about 3, Al and …
A Record Of Bermudrilus Peniatus (Oligochaeta: Tubificidae) From The Gulf Of Mexico, Christer Erseus
A Record Of Bermudrilus Peniatus (Oligochaeta: Tubificidae) From The Gulf Of Mexico, Christer Erseus
Gulf and Caribbean Research
The marine tubificid Bermudrilus peniatus Erséus, 19?9 (subfamily Phallodrilinae) is reported fromoff the west coast ofcentral Florida, at about 75 m depth. The species was previously known only from coral reefs at Bermuda.
A Preliminary Checklist Of Epiphytic And Benthic Marine Diatoms Of Louisiana, Robert S. Maples
A Preliminary Checklist Of Epiphytic And Benthic Marine Diatoms Of Louisiana, Robert S. Maples
Gulf and Caribbean Research
A checklist of diatoms collected from the various habitats in coastal salt marshes, estuaries, and nearshore Gulf waters of Louisiana has been compiled for the first time. The checklist includes 193 taxa (species and their varieties) in 38 genera. The largest number of taxa are species of Navicula and Nitzschia with 46 and 36, respectively. Future studies of the varied habitats along the Louisiana coast should result in many new additions to this preliminary checklist.
The Epiphytic Diatom Flora Of Two Sargassum Species, Robert S. Maples
The Epiphytic Diatom Flora Of Two Sargassum Species, Robert S. Maples
Gulf and Caribbean Research
The epiphytic diatom flora on the brown algae Sargassum natans (L.) J. Meyer and S. fluitans Børgesen were investigated and compared. A total of 50 taxa representing 21 genera were identified. The most abundant taxa were Amphora exigua Greg., A. coffeiformis (Ag.) Kütz., Synedra fasciculata (Ag.) Kütz., Cocconeis pseudodiruptoides Foged, and Navicula ramosissima (Ag.) Cleve. Comparisons of the dominant species and diversity statistics characterizing the two samples indicated the two brown algal species supported nearly identical epiphytic diatom floras.
Comments On Density Inversions In Marine Shallow Waters And Beyond, Gordon Gunter, Forrest V. Durand
Comments On Density Inversions In Marine Shallow Waters And Beyond, Gordon Gunter, Forrest V. Durand
Gulf and Caribbean Research
It has been shown within the past 70 years that salinity and thus density inversions are often detectible in shallow bays and estuaries. This terminology means that surface salinities are sometimes higher than those at lower depths. The first such discoveries in this country were made by Sumner, Louderback, Schmitt and Johnston (1914) in San Francisco Bay. They used Negetti-Zambta reversing thermometers for temperature and silver nitrate titration for salinity determination. These were by then considered to be classical methods and had been worked out in northern Europe, mostly in Scandinavia. They were introduced to the United States Gulf Coast …
Autecology Of The Black Needlerush Juncus Roemerianus, Lionel N. Eleuterius
Autecology Of The Black Needlerush Juncus Roemerianus, Lionel N. Eleuterius
Gulf and Caribbean Research
Juncus roemerianus generally occupies the upper half of the intertidal plane and covers about 92% or 25,000 hectares of marsh in Mississippi. The vegetative canopy is best described as a series of disjunct and intergrading populations. Considerable phenotypic variation and differences in standing crop exist between populations. J. roemerianus has very wide environmental tolerances in comparison to all other tidal marsh angiosperms. Soil types inhabited by the rush range from very sandy to highly organic muds and peats, which may vary in the concentration of nutrient elements (nitrogen, phosphorus and potassium). Neither soil type, nutrient concentration, water content, pH nor …
Growth And Production Of The Dwarf Surf Clam Mulinia Lateralis (Say 1822) In A Georgia Estuary, Randal L. Walker, Kenneth R. Tenore
Growth And Production Of The Dwarf Surf Clam Mulinia Lateralis (Say 1822) In A Georgia Estuary, Randal L. Walker, Kenneth R. Tenore
Gulf and Caribbean Research
The bivalve Mulinia lateralis is a dominant member of estuarine benthos, but its presence and abundance in Georgia estuarine waters is sporadic over time. Recruitment and production was monitored from 1977 through 1981 at three inner and one outer more saline ( > 18 ppt) areas of Wassaw Sound. Until the winter of 1981, Mulinia lateralis was absent or at very low densities. Significant settlement occurred in January 1981 when densities in the outer sound reached as high as 63,000 individuals • m-2). The clam was more abundant in sandy mud (x̄ = 10,161 • m-2) than …
Distribution And Ecology Of The Synaphobranchidae Of The Gulf Of Mexico, Douglas M. Martin
Distribution And Ecology Of The Synaphobranchidae Of The Gulf Of Mexico, Douglas M. Martin
Gulf and Caribbean Research
Synaphobranchid eels of the Gulf of Mexico are an important part of the upper continental slope ichthyofauna, occurring most frequently between 500 and 1,500 m. Two of the four known genera (Histiobranchus and Diastobranchus) have not been reported from the Gulf. Synaphobranchidae tend to occur within a narrow range of temperatures compared to the North Atlantic synaphobranchid eels. However, distribution of these eels in the deeper parts of the Gulf appears to be correlated more to change in depth than to temperature, salinity, or dissolved oxygen. The distribution at the shallower limits of their depth range appear to …
Amphipods Of The Family Ampeliscidae (Gammaridea). Iii. Ampelisca Parapacifica, A New Species Of Amphipod From The Western North Atlantic With The Designation Of A Substitute Name For A. Eschrichtii Pacifica Gurjanova, 1955, Gary D. Goeke, Richard W. Heard
Amphipods Of The Family Ampeliscidae (Gammaridea). Iii. Ampelisca Parapacifica, A New Species Of Amphipod From The Western North Atlantic With The Designation Of A Substitute Name For A. Eschrichtii Pacifica Gurjanova, 1955, Gary D. Goeke, Richard W. Heard
Gulf and Caribbean Research
A new species of benthic amphipod, Ampelisca parapacifica, is described from the southeastern Gulf of Mexico and compared with the closely allied Ampelisca pacifica Holmes, 1908, from the eastern Pacific. The distinctive form of the third uropod separates this species pair from other members of the "macrocephala" subgroup of the genus Ampelisca Kroyer, 1842. Ampelisca parapacifica is distinguished from A. pacifica by antenna I peduncle segment 2 less t}an twice the length of article 1 and uropod I peduncle shorter than the rami. Previous Atlantic records of A. pacifica are assigned to the proposed new species. The Pacific populations …