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An updated checklist of the continental copepod fauna of the Yucatan Peninsula, Mexico, with notes on its regional associations

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[The free-living continental copepod fauna of the Yucatan Peninsula has been studied for decades; recent intensive surveys suggest that its biodiversity is higher than formerly realized. An updated, revised checklist of the Yucatan copepods is provided herein. This new list includes 59 species, more a than 30% increase from the most recent previous account. The Yucatan Peninsula has long been considered to have faunistic affinities with Central and Southern Mexico and with South America. A similarity analysis was performed using regional records of Copepoda and including two taxa, the orders Calanoida and Cyclopoida. Results from both groups suggest that the Yucatan copepod fauna diverges from that of Central Mexico. Central Mexico itself seems to be closest to the upper Central American fauna, an affinity explained by a longer geological connection. Overall, the Yucatan copepod fauna appears to have more biogeographic ties with Cuba and the insular Caribbean than with Central America or the rest of Mexico. The occurrence of nearctic diaptomids such as Arctodiaptomus and Leptodiaptomus in the Yucatan seems to be related to a general invasion of these calanoids that reached Central America and intermittently spread into the Yucatan Peninsula. With two endemic species in the Yucatan, Mastigodiaptomus appears to have become diversified in the peninsula, derived from other neotropical forms. The local high proportion of endemic forms of Copepoda and the particular geological history of the Yucatan make this karstic area a peculiar, separate entity within the neotropical region that should be studied in more detail.

La fauna de copépodos de aguas continentales de la Península de Yucatán ha sido estudiada por décadas; estudios taxonómicos recientes sugieren que su biodiversidad es particularmente elevada. Se presenta aquí una lista actualizada y revisada de los copépodos de la Península de Yucatán. Esta lista incluye 59 especies, lo que representa un incremento de más del 30% con respecto al más reciente listado faunístico previo. Se ha considerado por mucho tiempo que la Peninsula de Yucatán tiene afinidades faunísticas con el centro y sur de México y con América del Sur. Se realizó un análisis de similitud utilizando los registros faunísticos regionales de Copepoda; el análisis incluyó los órdenes Cyclopoida y los Calanoida como grupos independientes. Los resultados sugieren que la fauna de Yucatán es distinta a la del centro de México; esta última subregión es más semejante a la fauna de Centroamérica, explicable por una conección geológica más prolongada. La fauna de copépodos de Yucatan parece estar más relacionada con la de Cuba y las islas del Caribe que con América Central o con el resto de México. La presencia de Diaptomidae neárticos, como Arctodiaptomus y Leptodiaptomus parece estar asociada a una invasión de estos taxa que alcanzó América Central y ocupó la península de manera intermitente. Mastigodiaptomus parece haberse diversificado en la península a partir de otras formas neotropicales. La elevada proporción de formas consideradas endémicas y la peculiar historia geológica de la península la convierten en una subregión de características exclusivas dentro de la región neotropical., The free-living continental copepod fauna of the Yucatan Peninsula has been studied for decades; recent intensive surveys suggest that its biodiversity is higher than formerly realized. An updated, revised checklist of the Yucatan copepods is provided herein. This new list includes 59 species, more a than 30% increase from the most recent previous account. The Yucatan Peninsula has long been considered to have faunistic affinities with Central and Southern Mexico and with South America. A similarity analysis was performed using regional records of Copepoda and including two taxa, the orders Calanoida and Cyclopoida. Results from both groups suggest that the Yucatan copepod fauna diverges from that of Central Mexico. Central Mexico itself seems to be closest to the upper Central American fauna, an affinity explained by a longer geological connection. Overall, the Yucatan copepod fauna appears to have more biogeographic ties with Cuba and the insular Caribbean than with Central America or the rest of Mexico. The occurrence of nearctic diaptomids such as Arctodiaptomus and Leptodiaptomus in the Yucatan seems to be related to a general invasion of these calanoids that reached Central America and intermittently spread into the Yucatan Peninsula. With two endemic species in the Yucatan, Mastigodiaptomus appears to have become diversified in the peninsula, derived from other neotropical forms. The local high proportion of endemic forms of Copepoda and the particular geological history of the Yucatan make this karstic area a peculiar, separate entity within the neotropical region that should be studied in more detail.

La fauna de copépodos de aguas continentales de la Península de Yucatán ha sido estudiada por décadas; estudios taxonómicos recientes sugieren que su biodiversidad es particularmente elevada. Se presenta aquí una lista actualizada y revisada de los copépodos de la Península de Yucatán. Esta lista incluye 59 especies, lo que representa un incremento de más del 30% con respecto al más reciente listado faunístico previo. Se ha considerado por mucho tiempo que la Peninsula de Yucatán tiene afinidades faunísticas con el centro y sur de México y con América del Sur. Se realizó un análisis de similitud utilizando los registros faunísticos regionales de Copepoda; el análisis incluyó los órdenes Cyclopoida y los Calanoida como grupos independientes. Los resultados sugieren que la fauna de Yucatán es distinta a la del centro de México; esta última subregión es más semejante a la fauna de Centroamérica, explicable por una conección geológica más prolongada. La fauna de copépodos de Yucatan parece estar más relacionada con la de Cuba y las islas del Caribe que con América Central o con el resto de México. La presencia de Diaptomidae neárticos, como Arctodiaptomus y Leptodiaptomus parece estar asociada a una invasión de estos taxa que alcanzó América Central y ocupó la península de manera intermitente. Mastigodiaptomus parece haberse diversificado en la península a partir de otras formas neotropicales. La elevada proporción de formas consideradas endémicas y la peculiar historia geológica de la península la convierten en una subregión de características exclusivas dentro de la región neotropical.]

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/content/journals/10.1163/156854003771997855
2003-09-01
2016-09-24

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