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  • 1
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    Soft crab fisheries: potential for Caribbean development (2021)
    In:  http://aquaticcommons.org/id/eprint/12460 | 9 | 2013-12-03 22:14:54 | 12460 | Gulf and Caribbean Fisheries Institute
    Details
    Publication Date: 2021-07-01
    Keywords: Fisheries ; GCFI
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 67-78
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  • 2
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    Economic considerations to the management of queen conch resources in Puerto Rico (2021)
    In:  http://aquaticcommons.org/id/eprint/12896 | 9 | 2013-12-18 21:34:57 | 12896 | Gulf and Caribbean Fisheries Institute
    Details
    Publication Date: 2021-07-06
    Keywords: Fisheries ; GCFI
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 972-981
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  • 3
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    Fisheries management policy in Puerto Rico: a progress report (2021)
    In:  http://aquaticcommons.org/id/eprint/14092 | 6 | 2014-01-05 10:22:56 | 14092 | Gulf and Caribbean Fisheries Institute
    Details
    Publication Date: 2021-07-08
    Keywords: Fisheries ; GCFI
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 111-122
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  • 4
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    Antarctic ice-sheet sensitivity to obliquity forcing enhanced through ocean connections (2019)
    Details
    Publication Date: 2022-04-22
    Description: Deep sea geological records indicate that Antarctic ice-sheet growth and decay is strongly influenced by the Earth's astronomical variations (known as Milankovitch cycles), and that the frequency of the glacial-interglacial cycles changes through time. Here we examine the emergence of a strong obliquity (axial tilt) control on Antarctic ice-sheet evolution during the Miocene by correlating the Antarctic margin geological records from 34 to 5 million years ago with a measure of obliquity sensitivity that compares the variance in deep sea sediment core oxygen-isotope data at obliquity timescales with variance of the calculated obliquity forcing. Our analysis reveals distinct phases of ice-sheet evolution and suggests the sensitivity to obliquity forcing increases when ice-sheet margins extend into marine environments. We propose that this occurs because obliquity-driven changes in the meridional temperature gradient affect the position and strength of the circum-Antarctic easterly flow and enhance (or reduce) ocean heat transport across the Antarctic continental margin. The influence of obliquity-driven changes in ocean dynamics is amplified when marine ice sheets are extensive, and sea ice is limited. Our reconstruction of the Antarctic ice-sheet history suggests that if sea-ice cover decreases in the coming decades, ocean-driven melting at the ice-sheet margin will be amplified.
    Description: Published
    Description: 132-137
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: 4A. Oceanografia e clima
    Description: 5A. Ricerche polari e paleoclima
    Description: JCR Journal
    Keywords: :MIDDLE MIOCENE CLIMATE; SEA-LEVEL; ROSS SEA; HEMISPHERE CLIMATE; CONTINENTAL-SHELF; ODP SITE-1165; PRYDZ BAY; SOUTHERN; INTENSIFICATION; HISTORY
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
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    A large West Antarctic Ice Sheet explains early Neogene sea-level amplitude (2021)
    In:  EPIC3Nature, 600(7889), pp. 450-455, ISSN: 0028-0836
    Details
    Publication Date: 2022-01-20
    Description: Early to Middle Miocene sea-level oscillations of approximately 40–60 m estimated from far-field records1–3 are interpreted to reflect the loss of virtually all East Antarctic ice during peak warmth2. This contrasts with ice-sheet model experiments suggesting most terrestrial ice in East Antarctica was retained even during the warmest intervals of the Middle Miocene4,5. Data and model outputs can be reconciled if a large West Antarctic Ice Sheet (WAIS) existed and expanded across most of the outer continental shelf during the Early Miocene, accounting for maximum ice-sheet volumes. Here we provide the earliest geological evidence proving large WAIS expansions occurred during the Early Miocene (~17.72–17.40 Ma). Geochemical and petrographic data show glacimarine sediments recovered at International Ocean Discovery Program (IODP) Site U1521 in the central Ross Sea derive from West Antarctica, requiring the presence of a WAIS covering most of the Ross Sea continental shelf. Seismic, lithological and palynological data reveal the intermittent proximity of grounded ice to Site U1521. The erosion rate calculated from this sediment package greatly exceeds the long-term mean, implying rapid erosion of West Antarctica. This interval therefore captures a key step in the genesis of a marine-based WAIS and a tipping point in Antarctic ice-sheet evolution.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 6
    Electronic Resource
    Electronic Resource
    Population studies on benthic nematodes within a subtropical seagrass community (1967)
    Springer
    Marine biology 1 (1967), S. 85-96 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Examination of the benthic nematode fauna of the soft surface sediments of a turtle grass (Thalassia testudinum König) bed in Biscayne Bay (Miami, Florida) has revealed a high degree of homogeneity exemplified by the dominance of four species out of approximately 100 nematode taxa from the area. The dominant species, Metoncholaimus scissus, Theristus fistulatus, Spirinia parasitifera and Gomphionema typica, regularly comprised between 87 and 95% of the total number of nematodes present in samples collected during the winter and spring of 1966. T. fistulatus showed an abundance of 56% over the course of the study, i.e., 160 samples collected over a period of 14 months. Maximal peaks in population densities were noted and correlated with physiographic alterations in the environment. The M. scissus population declined concurrent with changes in the community; at the same time, with accumulation of sediment, the Terschellingia longicaudata population increased. Ratios of species, and especially shifts in the dominantforms present, with repeated collections, are extremely useful indicators of important biological and physical changes in a particular environment. Analysis of distributional data on dominant species in 64 samples from eight closely approximated positions showed that observed temporal and spatial variations were not significant statistically at the 5% level. It is concluded that erroneous observations can be made from ecological studies based on field data derived without proper replication or consideration of seasonal factors. The latter as well as intrinsic variability within the particular locality itself contribute to the basic faunistic composition of benthic communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386510
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  • 7
    Electronic Resource
    Electronic Resource
    Yeasts from the North Sea (1967)
    Springer
    Marine biology 1 (1967), S. 118-123 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Yeasts were isolated from twelve established sites in the North Sea from 1964 to 1966. A percentage frequency of 99% with populations varying from 〈10 to 〉3000 viable cells/L was observed. This mycota was characterized by considerable spatial and temporal fluctuation, with the dominant yeast present being the ascosporogenous species, Debaryomyces hansenii. This taxon, as well as other common North Sea yeasts, e.g., Rhodotorula rubra and Candida diddensii, have been reported frequently from other marine locales. Noteworthy concentrations of yeasts, especially D. hansenii, were observed during summer months, often in association with various stages of development of the dinoflagellate, Noctiluca miliaris. The population dynamics of the North Sea yeasts are discussed in relation to similar studies of other marine environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386516
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  • 8
    Electronic Resource
    Electronic Resource
    Cellulose degradation by Lulworthia floridana and other lignicolous marine fungi (1968)
    Springer
    Marine biology 2 (1968), S. 41-46 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Gravimetric analyses of cellulose (Solka Floc) utilization by representative marine Ascomycetes, including Lulworthia floridana, Lindra sp., Torpedospora sp. and Halosphaeria mediosetigera, have shown noteworthy activity based on loss of weight of cellulose by the various fungi. Particularly striking activity is evidenced by L. floridana and Torpedospora sp., with 〉50% cellulose degradation after 3 weeks of fungal growth. Comparable studies with the deuteromycete, Dendryphiella salina, showed 〉50% loss within 6 days. Dissimilar responses by various L. floridana isolates are noted. Intensive degradative activity at pH's of 6 to 8 is common along with negligible amounts of cellulase (Cx units). Adsorption of the enzyme to the mycelia or to the cellulose particles in the medium is suggested. Earlier laboratory analyses of fungal degradation of Manila cordage compare favorably with present gravimetric studies and support field observations on the significance of fungal infestation of wood, particularly that incited by the Lulworthia floridana group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351636
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  • 9
    Electronic Resource
    Electronic Resource
    Ecological investigations of the marine nematode Metoncholaimus scissus (1970)
    Springer
    Marine biology 6 (1970), S. 43-47 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Significant concentrations of the large oncholaimid Metoncholaimus scissus Wieser and Hopper (1967) (〉7000 animals/24 cm2 area or 2.68x106 specimens/m2) have been noted in soft-bottom turtle grass communities. Activities of the nematode frequently show an indirect relationship to blooms of the benthic diatom Pleurosigma balticum. Analysis of biomass data for M. scissus (as much as 28 g wet weight/m2) demonstrate the importance of microsite activity and sensitivity of the species to small significant changes in the benthic environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352606
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  • 10
    Electronic Resource
    Electronic Resource
    Ecology and characterization of yeasts from aquatic regions of South Florida (1968)
    Springer
    Marine biology 1 (1968), S. 291-308 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mycological investigations, entailing over 400 samples from 120 separate collection stations, of the composite aquatic regions of southern Florida and adjacent areas have been developed. A collection of over 1000 yeasts, representing more than 50 taxa, has been characterized and studied. Highest yeast densities were found in freshwaters with the recovery of yeasts per sample decreasing from 100% to approximately 70% with lowered organic content, increasing salinity and remoteness from land. Average cell population densities, variety of species, and particularly the number of sexual yeasts, decreased in saline samples. The isolation media used were evaluated and have been discussed in terms of yeast densities obtained. Stritly oxidative species of Candida, Cryptococcus, and Rhodotorula and the sexual yeast, Debaryomyces hansenii, were the most widespread in all the habitas studied and the predominant forms in water of relatively low organic content. Selective survival of certain yeasts in the various aquatic environments was suggested. Definite distributional patterns were exhibited by various taxa and the possible existence of “indicator” species wa suggested. The systematics of the fungi have been reviewed at length and the significance of strain differences considered and discussed as related to the unique characteristics of the various ecological habitats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00360780
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