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| Registros recuperados: 11.818 | |
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| Ramírez Llodra,Eva; Tyler,Paul A; German,Christopher R. |
| The vast majority of the mid-ocean ridge system and of the continental margins around the globe have not yet been explored. A relatively small number of vent and seep sites have been analysed and are the focus of long-term research programmes. However, the exploration of new areas will certainly provide the discovery of new vent and seep sites. Furthermore, the study of these key locations will lead to the description of new species and improve our understanding of the abundance, diversity, and distribution of species from chemosynthetically-driven systems around the world's oceans. It is the aim of ChEss to develop an exploration field phase to discover new deep-water hydrothermal vents and cold seeps at key locations, to describe their fauna, and to... |
| Tipo: Journal article |
Palavras-chave: Biogeography; Hydrothermal vents; Cold seeps; Southern oceans. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200006 |
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| Díaz-Páez,Helen; Ortiz,Juan Carlos. |
| Se analizó la dieta de una población del sapito de cuatro ojos (Pleurodema thaul) de la localidad de Hualpén (Talcahuano, Chile). El estudio se realiza durante los períodos reproductivos (junio-diciembre) que comprenden los años 2000 y 2001. Estos anuros destinan una menor importancia al consumo de presas durante la época reproductiva, por lo que presentan una baja frecuencia de ocurrencia (50,63%). La dieta de P. thaul está compuesta fundamentalmente de artrópodos (IRI = 0,92), con un consumo de menor importancia de vegetales (IRI = 0,035). Se determinó una alta diversidad de ítemes de presa (37 taxa). Los ítemes alimentarios dípteros y arácnidos son los más comunes. No se detectan relaciones entre el tamaño de las presas y el tamaño de los anuros |
| Tipo: Journal article |
Palavras-chave: Dieta; Anfibia; Leptodactylidae; Chile. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100004 |
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| Miloslavich,Patricia; Klein,Eduardo; Yerena,Edgard; Martin,Alberto. |
| Venezuela is among the ten countries with the highest biodiversity in the world, both in the terrestrial and the marine environment. Due to its biogeographical position, Venezuelan marine flora and fauna are composed of species from very different marine bioregions such as the Caribbean and the Orinoco Delta. The ecosystems in the Caribbean have received considerable attention but now, due to the tremendous impact of human activities such as tourism, over-exploitation of marine resources, physical alteration, the oil industry, and pollution, these environments are under great risk and their biodiversity highly threatened. The most representative ecosystems of this region include sandy beaches, rocky shores, seagrass beds, coral reefs, soft bottom... |
| Tipo: Journal article |
Palavras-chave: Venezuela; Marine biodiversity; Conservation; Protected areas; Biological collections. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200012 |
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| O'Dor,R.K.; Yarincik,K. |
| As an overview provided to the South American Workshop on Marine Biodiversity, this article presents the unique collaborative approach of the Census of Marine Life (CoML) to increasing our knowledge of the abundance, distribution and diversity of marine life throughout the world's oceans. Five elements comprise the foundation of the research program, providing information and methods useful for enhancing our understanding of marine biodiversity, both historically and today, and making sound predictions of biological diversity in the future. (1) A series of initial field projects will demonstrate techniques or technologies to be applied to future studies. Some of these will test new technologies in well-known areas of the ocean, but most will take place in... |
| Tipo: Journal article |
Palavras-chave: Marine biodiversity; Census of Marine Life; CoML. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200003 |
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| Sánchez,René M.; Galvis,Germán; Victoriano,Pedro F.. |
| Se analizó los contenidos estomacales de 21 especies de peces capturadas en el río Yucao, en dos sitios y periodos anuales diferentes. Las estructuras del tracto digestivo fueron clasificadas de acuerdo a la posición de la boca, forma del estómago y dientes, longitud del intestino y número de braquispinas y ciegos pilóricos. Estas características se relacionaron con cuatro hábitos alimentarios generalizados: detritívoros, herbívoros, consumidores de perifiton (perifitófagos) y omnívoros. La forma de los dientes y del estómago fueron las estructuras del digestivo que, en los análisis de correspondencia, se relacionaron mejor con los diferentes tipos de alimentación. De acuerdo a la composición espacial y temporal de los contenidos estomacales en cada... |
| Tipo: Journal article |
Palavras-chave: Río Yucao; Contenido estomacal; Morfología del tracto digestivo; Peces tropicales. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100010 |
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| Ubeda,Carmen; Grigera,Dora. |
| Sobre la base de una evaluación del estado de conservación de la herpetofauna de Argentina, publicada recientemente, se analizan los factores determinantes del estatus asignado, con énfasis en las especies de las categorías que indican una mayor amenaza. De los 484 taxa evaluados el 23 % tiene problemas de conservación. Una proporción importante de estas especies tiene áreas de distribución restringidas, especialización en el uso del hábitat, está poco protegida y sufre acciones extractivas. Se analizan los principales factores de amenaza sobre los herpetozoos, encontrándose que la mayoría está afectada por la alteración del hábitat. Los reptiles sufren el comercio más intensamente que los anfibios. Se comparan los resultados de la nueva evaluación con la... |
| Tipo: Journal article |
Palavras-chave: Estado de conservación; Amenazas; Anfibios; Reptiles; Argentina. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100012 |
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| Cruz,Manuel; Gabor,Nikita; Mora,Elba; Jiménez,Roberto; Mair,James. |
| Ecuador has a high diversity of ecosystems in its coastal and marine territory with beaches, bays, estuaries, cliffs, coastal lagoons and rocky coasts being the most representative. So far, 1,859 marine species have been identified in Ecuador. Of these, 1380 species of non-commercial marine invertebrates and vertebrates, belonging to 8 Phyla and distributed in 25 groups or classes, occur along the coast of Ecuador. These are: Protozoans, 9 groups: Oceanic and estuarine Diatoms, Cyanophyta, Chlorophyta, Dinoflagellates, Coccolithophorida, Silicoflagellates, Euglenophyta, Tintinnids and planktonic and benthic Foraminifera; Cnidaria, 2 classes: Hydromedusae and Scyphomedusae; Mollusca, 5 classes: Wood-boring molluscs and rock-boring and benthic bivalves;... |
| Tipo: Journal article |
Palavras-chave: Biodiversity; Pelagic; Demersal; Benthic; Gulf of Guayaquil. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200010 |
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| Alarcón,Mauricio E.. |
| Se estudió la sifonapterofauna recolectada en los roedores Abrothrix longipilis (Waterhouse), Abrothrix olivaceus (Waterhouse) y Rattus rattus Lineo, durante el período de mayo 2000-febrero 2001. Se informan aspectos taxonómicos y ecológicos que contribuyen al conocimiento de la fauna de sifonápteros de la VIII Región de Chile. Se obtuvo un total de 533 pulgas. Los resultados indican a R. rattus como nuevo hospedero para las pulgas Ctenoparia inopinata Rothschild, Sphinctopsylla ares (Rothschild) y Tetrapsyllus rhombus Smit en Chile y, a Neotyphloceras crassispina Rothschild como un nuevo registro para la Región. Plocopsylla wolffsohni (Rothschild) fue la especie más abundante en invierno y Ctenoparia inopinata en primavera |
| Tipo: Journal article |
Palavras-chave: Pulgas; VIII Región; Nuevo hospedero; Nuevo registro; Roedores. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100003 |
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| Tarazona,Juan; Gutiérrez,Dimitri; Paredes,Carlos; Indacochea,Aldo. |
| This paper is a panoramic, though incomplete, review of the Peruvian marine biodiversity, including the Peruvian coastal upwelling ecosystem, the marine shallow areas of the Peruvian coast and the mangrove ecosystem of the north of Peru. It includes an analysis of the advances in conservation and management, as well as of research resources. The analysis mainly showed the insufficient human resources and the limited facilities in laboratories and coastal research stations. An analysis was also made from the current unknowns of the research at taxonomy and ecosystem levels, indicating scarce studies for most of the taxonomic groups and biological communities. Finally, the consultations and discussions promoted with the scientific community, allowed the... |
| Tipo: Journal article |
Palavras-chave: Coastal upwelling ecosystem; Marine shallow areas; Mangrove ecosystem of the north; Conservation and management. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200009 |
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| Díaz,Juan M; Acero,Arturo. |
| Colombia is recognized as a megadiverse country on the basis of the number of terrestrial animal and plant species occurring within its boundaries. However, due to the circumstance that it possesses coasts on both the Caribbean Sea and the Pacific Ocean, each of them exhibiting distinct geological, oceanographic, and climatic features, Colombia is perhaps the country with the highest marine biological diversity in South America and one of the most biodiverse in the New World. Although scientific research concerning marine biodiversity of Colombia has a very short history, considerable knowledge has been achieved in the last 10 years, particularly in regard to species inventories and ecosystem characterizations, including thematic mapping. Relatively... |
| Tipo: Journal article |
Palavras-chave: Marine biodiversity; Colombia; Caribbean; Eastern Pacific; Marine ecosystems. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200011 |
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| Pierrot-Bults,Annelies C.. |
| Biogeography around South America is well documented on the Atlantic side and less well documented on the Pacific side especially south of about 30º S. The South Pacific oceanic areas are the least known of all pelagic areas. The different approaches to determine biogeographic provinces (e.g. the classical one showing mainly latitudinal and watermass distribution patterns based on presence/absence of species; and the biogeochemical approach based on productivity regimes and modelling) are discussed. The latter shows more east-west division. Testing of these concepts will probably reveal more coastal provinces in the Pacific area. The transitional area in the South Pacific is also an interesting area for molecular species research because there are some... |
| Tipo: Journal article |
Palavras-chave: Pelagic biodiversity; Biogeography; South America. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200005 |
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| Gutt,Julian; Arntz,Wolf E; Balguerias,Eduardo; Brandt,Angelika; Gerdes,Dieter; Gorny,Matthias; Sirenko,Boris. |
| A look at the latitudinal gradient from North America via South America to Antarctica supports the impression that the ecosystems of this part of the world provide perfect conditions for marine biodiversity studies. Several bilateral or international initiatives with major German contributions have focused on biodiversity questions, especially in South America and Antarctica. At depths > 50 m accessible to shipboard sampling, an oxygen minimum zone (OMZ) prevails off Peru and Chile (except in the extreme south). The macrobenthic biota associated with the OMZ are extremely poor but show a gradient of increasing diversity at great depths and towards the south. In the southern Chilean fjords and channels, habitat heterogeneity is high and differences in... |
| Tipo: Journal article |
Palavras-chave: Marine biodiversity; South America; Antarctica. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200007 |
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| Registros recuperados: 11.818 | |
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