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| Maravilla-Chávez,M. Octavio; Zavala-González,Alfredo; Ortega-Rubio,Alfredo. |
| This paper describes for the first time the relative abundance, population structure and numeric variation of California sea lions in the Gulf of California, Mexico, during four different seasons. The relative abundance estimates varied from the highest 17,162 sea lions in July of 1990 (summer) to a minimum 7,470 in February of 1992 (winter), representing a reduction of 10,000 sea lions. Hypotheses about the migration of part of the population to the Pacific Ocean were compared and discussed against their residency inside the Gulf, and seasonal dispersion of individuals along this inner sea. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zalophus californianus californianus; Seasonal variations; Relative abundance; Migration; Gulf of California; Mexico. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000100013 |
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| Kalansky, Julie F.; Robinson, Rebecca S.; Popp, Brian N.. |
| The nitrogen isotopic composition of organic matter contained within diatom frustules of different sediment size fractions from the Guaymas Basin, Gulf of California, suggests that multiple nutrient cycling processes can be examined from a single sediment sample. The diatom-bound delta(15)N values from the greater and less than 63 mu m size fractions were analyzed from six intervals of core MD02-2517, each representing similar to 30-40 years. The diatom-bound delta(15)N values are compared to bulk sedimentary delta(15)N values, weight percent biogenic opal, and weight percent organic carbon. Bulk sedimentary delta(15)N values range from 10 parts per thousand to 12.5 parts per thousand and diatom-bound delta(15)N values of the <63 mu m size fraction from... |
| Tipo: Text |
Palavras-chave: Gulf of California; Diatoms; Export flux; Nitrogen cycling; Nitrogen isotopes. |
| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00227/33836/32444.pdf |
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| Bastida-Zavala, J. Rolando; Hove, Harry A. ten. |
| A taxonomic revision of the Hydroides species (Polychaeta: Serpulidae) from the Eastern Pacific Ocean is presented. Twentyone taxa are described, of which two are widespread (H. diramphus Mörch, 1863 and H. elegans (Haswell, 1883)) and four are Amphiamerican (H. alatalateralis (Jones, 1962), H. gairacensis Augener, 1934, H. salazarvallejoi Bastida-Zavala & Ten Hove, 2003, and H. sanctaecrucis Kroyer [in] Mörch, 1863). Three species are new to science: Hydroides deleoni n. sp., H. panamensis n. sp. and H. trompi n. sp. Morphometric comparisons between H. brachyacanthus Rioja, 1941, H. deleoni n. sp., and H. similis (Treadwell, 1929), between H. chilensis Hartmann-Schröder, 1962, H. cruciger Mörch, 1863 and H. panamensis n. sp., and between H.... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Central America; Gulf of California; Key; New species; Serpulinae; Standard diagnosis. |
| Ano: 2003 |
URL: http://www.repository.naturalis.nl/record/505009 |
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| Vincent, Amanda CJ; Project Seahorse, Institute for the Oceans and Fisheries, University of British Columbia; a.vincent@oceans.ubc.ca. |
| Socio-political issues are important in environmental policy outcomes but are often overlooked in conservation planning. We analyze the effects of historical social, political, and ecological contexts on conservation policy outcomes as applied to the Upper Gulf of California and Colorado River Delta Biosphere Reserve. A rushed implementation, perhaps necessary for the protection of endangered totoaba (Totoaba macdonaldi) and vaquita (Phocoena sinus), occurred with little community consultation, resulting in enduring disgruntlement among stakeholders that undermined its effectiveness. Overfishing and habitat degradation continue both inside and outside the reserve, and totoaba and vaquita remain Critically Endangered, with the latter’s population... |
| Tipo: Peer-Reviewed Synthesis |
Palavras-chave: Biosphere Reserve; Flagship species; Gulf of California; Social-ecological dynamics; Totoaba; Vaquita. |
| Ano: 2016 |
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