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Changes in lizard abundance on protected versus grazed desert scrub in Baja California Sur, Mexico BABT
Romero-Schmidt,Heidi L; Ortega-Rubio,Alfredo.
The changes in abundance of three species of lizards were determined and compared between grazed and ungrazed desert scrub near La Paz, in the Cape Region, Baja California Sur, Mexico, from April 1992 to March 1993. A total of 54 censuses were taken of these species over two transect systems, one inside and one outside livestock enclosure. Urosaurus nigricaudus were negatively affected by the grazing activities, but Uta stansburiana exhibited an apparently positive effect by such activities. Cnemidophorus hyperythrus population apparently showed no effect by the livestock grazing. The paper discusses the possible relationship between the microhabitat specificity of each species and their population number individuals response.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Baja California Sur; Lizard abundance; Livestock grazing; Mexico.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000200007
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The Impact of Resource Scarcity on Bonding and Bridging Social Capital: the Case of Fishers’ Information-Sharing Networks in Loreto, BCS, Mexico Ecology and Society
Ramirez-Sanchez, Saudiel; Oceans Policy and Planning Branch, Department of Fisheries and Oceans; Saudiel.RamirezSanchez@dfo-mpo.gc.ca; Pinkerton, Evelyn; Simon Fraser University; evelyn_pinkerton@sfu.ca.
Fishers often rely on their social capital to cope with resource fluctuations by sharing information on the abundance and location of fish. Drawing on research in seven coastal fishing communities in Loreto, Baja California Sur, Mexico, we examine the effect of resource scarcity on the bonding, bridging, and linking social-capital patterns of fishers’ information-sharing networks. We found that: (1) fishers’ information sharing is activated in response to varying ecological conditions; (2) resource scarcity is an ambiguous indicator of the extent to which fishers share information on the abundance and location of fish within and between communities; (3) information sharing is based on trust and occurs through kinship, friendship, and...
Tipo: Peer-Reviewed Reports Palavras-chave: Baja California Sur; Bonding and bridging social capital; Fishers’ Information-sharing networks; Resilience; Social network analysis.
Ano: 2009
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