Inventory and conservation of breeding waterbirds at Ojo de Liebre and Guerrero Negro lagoons, Baja California Sur Mexico

Inventory and conservation of breeding waterbirds at Ojo de Liebre and Guerrero Negro lagoons, Baja California Sur Mexico

Surveys made in 1997/98 at the lagoons of Ojo de Liebre (Scammon´ s Lagoon) and Guerrero Negro, Baja California Sur, Mexico, showed that changes have occurred since 1926 in the species composition of the community of breeding waterbirds, in the arrangement of their nesting substrate and in their pop...

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Autores principales: Castellanos, A, Salinas, F, Ortega-Rubio, A
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2001
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/492
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id oai:cienciasmarinas.com.mx:article-492
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Castellanos, A
Salinas, F
Ortega-Rubio, A
spellingShingle Castellanos, A
Salinas, F
Ortega-Rubio, A
Inventory and conservation of breeding waterbirds at Ojo de Liebre and Guerrero Negro lagoons, Baja California Sur Mexico
author_facet Castellanos, A
Salinas, F
Ortega-Rubio, A
author_sort Castellanos, A
title Inventory and conservation of breeding waterbirds at Ojo de Liebre and Guerrero Negro lagoons, Baja California Sur Mexico
title_short Inventory and conservation of breeding waterbirds at Ojo de Liebre and Guerrero Negro lagoons, Baja California Sur Mexico
title_full Inventory and conservation of breeding waterbirds at Ojo de Liebre and Guerrero Negro lagoons, Baja California Sur Mexico
title_fullStr Inventory and conservation of breeding waterbirds at Ojo de Liebre and Guerrero Negro lagoons, Baja California Sur Mexico
title_full_unstemmed Inventory and conservation of breeding waterbirds at Ojo de Liebre and Guerrero Negro lagoons, Baja California Sur Mexico
title_sort inventory and conservation of breeding waterbirds at ojo de liebre and guerrero negro lagoons, baja california sur mexico
description Surveys made in 1997/98 at the lagoons of Ojo de Liebre (Scammon´ s Lagoon) and Guerrero Negro, Baja California Sur, Mexico, showed that changes have occurred since 1926 in the species composition of the community of breeding waterbirds, in the arrangement of their nesting substrate and in their population size. Of 17 species breeding in the area in 1926, we found 12 nesting there during our survey. Additional data from other researchers allowed us to conclude that 16 species have nested in the area after 1984. Only one species (Sterna elegans) has not been reported nesting; however, it is still considered to be a local breeder. Three species (Egretta alba, Larus atricilla and Falco peregrinus) became new established breeders. Most of the species that breed on the islands within Scammon´ s Lagoon have a stable population or have increased in number. None of the egret species breeding in 1926 in marshes outside the islands currently nest there. Four species (Sterna antillarum, Charadrius wilsonia, Charadrius alexandrinus and Rallus longirostris) breed on the islands or at other sites in the lagoons and vicinity. Despite development in the region, the natural wetlands and open-water coverage remain almost unchanged. Natural nesting substrates are mostly confined to the islands and are vulnerable to land predators, wave erosion and direct human disturbance. These factors may have caused the shifting of nesting spots from one island to another and to other suitable nesting sites on the lagoons, the urban landscape, the saltworks and man-made structures. Breeding waterbirds have been granted limited protection through reserves and single-species conservation programs. We suggest guidelines to enhance their protection as a community in the context of El Vizcaíno Biosphere Reserve.
publisher Iniversidad Autónoma de Baja California
publishDate 2001
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/492
_version_ 1715723974929809408
spelling oai:cienciasmarinas.com.mx:article-4922019-05-07T00:39:19Z Inventory and conservation of breeding waterbirds at Ojo de Liebre and Guerrero Negro lagoons, Baja California Sur Mexico Inventario y conservación de la avifauna acuática reproductora de las lagunas Ojo de Liebre y Guerrero Negro, Baja California Sur, México Castellanos, A Salinas, F Ortega-Rubio, A Ojo de Liebre Baja California Sur breeding waterbirds Ojo de Liebre Baja California Sur aves acuáticas Surveys made in 1997/98 at the lagoons of Ojo de Liebre (Scammon´ s Lagoon) and Guerrero Negro, Baja California Sur, Mexico, showed that changes have occurred since 1926 in the species composition of the community of breeding waterbirds, in the arrangement of their nesting substrate and in their population size. Of 17 species breeding in the area in 1926, we found 12 nesting there during our survey. Additional data from other researchers allowed us to conclude that 16 species have nested in the area after 1984. Only one species (Sterna elegans) has not been reported nesting; however, it is still considered to be a local breeder. Three species (Egretta alba, Larus atricilla and Falco peregrinus) became new established breeders. Most of the species that breed on the islands within Scammon´ s Lagoon have a stable population or have increased in number. None of the egret species breeding in 1926 in marshes outside the islands currently nest there. Four species (Sterna antillarum, Charadrius wilsonia, Charadrius alexandrinus and Rallus longirostris) breed on the islands or at other sites in the lagoons and vicinity. Despite development in the region, the natural wetlands and open-water coverage remain almost unchanged. Natural nesting substrates are mostly confined to the islands and are vulnerable to land predators, wave erosion and direct human disturbance. These factors may have caused the shifting of nesting spots from one island to another and to other suitable nesting sites on the lagoons, the urban landscape, the saltworks and man-made structures. Breeding waterbirds have been granted limited protection through reserves and single-species conservation programs. We suggest guidelines to enhance their protection as a community in the context of El Vizcaíno Biosphere Reserve. Inventarios realizados entre 1997 y 1998 en las lagunas Ojo de Liebre y Guerrero Negro, Baja California Sur, México, mostraron que desde 1926 han ocurrido cambios en la composición de especies de aves acuáticas reproductoras, en la distribución de sus substratos de anidamiento y en el tamaño de sus poblaciones. De 17 especies que anidaban en el área en 1926, encontramos 12 anidando ahí durante nuestro inventario. Datos adicionales de otros investigadores nos permiten concluir que 16 especies han anidado en al área después de 1984. Sólo una de las especies históricamente reportadas (Sterna elegans) no ha sido vista anidando; sin embargo, no se descarta como un reproductor local. Tres especies (Egretta alba, Larus atricilla y Falco peregrinus) se establecieron como nuevos reproductores. La mayoría de las especies que anidan en las islas dentro de la Laguna Ojo de Liebre tienen poblaciones estables o incrementaron sus números. Ninguna de las especies de garzas que en 1926 anidaban en las marismas fuera de las islas, se encontró anidando ahí en nuestro inventario. Cuatro especies (Sterna antillarum, Charadrius wilsonia, Charadrius alexandrinus y Rallus longirostris) anidan fuera de las islas, en otros sitios de las lagunas. No obstante el desarrollo de la región, la cobertura de los humedales naturales y de aguas abiertas permanece casi sin cambios. Los substratos de anidamiento naturales están confinados, en su mayor parte, a las islas y son vulnerables a los depredadores terrestres, a la erosión por el oleaje y a la perturbación humana directa. Estos factores pudieron haber causado el cambio de zonas de anidamiento de una isla a otra y hacia algunos sitios de anidamiento adecuados en las lagunas, al paisaje urbano, la salina y en estructuras antropogénicas. Las aves acuáticas reproductoras obtuvieron protección incipiente a través del establecimiento de reservas y de programas de conservación de especies singulares. Sugerimos algunos lineamientos para fortalecer su protección como comunidad en el contexto de la Reserva de la Biósfera El Vizcaíno. Iniversidad Autónoma de Baja California 2001-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/492 10.7773/cm.v27i3.492 Ciencias Marinas; Vol. 27 No. 3 (2001); 351-373 Ciencias Marinas; Vol. 27 Núm. 3 (2001); 351-373 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/492/431

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