During the summer of 1984 seven samples of sediemnt and flating scum from three zones were collected at Laguna Figueroa, in order to analize benthic diatoms associations. A total of 67 taxa including species and varieties were identified. The most important species were Amphora salina, Mastogloia pusilla and Achnathes heideni.

This paper report a survey of the breeding birds of Laguna Figueroa and La Pinta pond, Baja California. A total of 7 species were counted six of them were reported in both sites.

In the peninsula of Baja california the only breeding colonies of Caspian Tern known so far are Scammon´s Lagoon and Laguna San Ignacio both of these colonies are located south of latitude 28° in the state of Baja California Sur. This note report an additional small breeding colony at Laguna Figueroa (30° 40´N), the first for the state of Baja California. This lagoon was visited on 7-9 May, 28 May and 22 June 1991. Results were first visit, same breeding birds reported previously, second visit one pair of Caspian Tern one individual alone, and a nest with one egg, third visit 22 individuals (10 pairs), six nest with one egg, three with two eggs, two eggs broken by predators and a few empty nest scrapes.

Este documento se compone de cinco partes, la primera trata de proporcionar los antecedentes de planeación urbanaa a nivel nacional, en donde dá los aspectos preliminares y las bases jurídicas de la planeación urbana del país.La segunda parte dá un diagnóstico del área de San Quintín, donde se describe las características del medio natural como: orografía, hidrografía, geología, ocupación del suelo, aspectos socioeconómicos, así como estructura urbana (vivienda, infrestructura y servicios, riesgos, usos de suelo, administración del desarrollo urbano y estructura urbana). La tercera parte del documento trata la fase de pronóstico; en esta parte, en base a los datos y cifras citados en el diágnóstico tratan de determinar el comportamiento futuro de las localidades que conforman el área urbana San Quintín-Lazaro Cárdenas en cuanto a sus tendencias naturales se refiere; esto es, los problemas y limitaciones que tendrían para su desarrollo urbano, sí continuaran las condiciones que se han dado hasta la fecha. En la cuarte fase se presenta la parte propositiva del documento constituida por normas y estrategias de desarrollo, en la cual se estable una Imagen Objetiva del Centro de Población y la última parte del documento son los anexos, en los cuales se dá la información complementaria, como cuadros socioeconómicos, definición de usos y el anexo gráfico.

In order to estimate organochlorine contamination of Playa San Ramón and el Playón from the San Quintín region, concentrations of DDT have been determined in the pismo clam Tivella stultorum during February, April, June and Agust of 1983. The results indicate DDT values significantly higher in Playa San Ramon. The concentrations of DDT are about tree orders of magnitude below those which are regarded to present a hazard as human food.

This work proposes an integral handling of the watershed, with the purpose to contribute to the local and regional sustainable development, through the articulation of selected methodologies of pilot watershed, physiographic uprising, draining into watershed, ecological ordinance, digitalized photo interpretation and geographical information.

These are unpublished field notes of the authors that have been taken during several projects carried out in the wetlands of Baja California. They include information from 1988 to date and are mostly on birds and their habitats.

One hundred and twenty plants species were collected on the dunes along the 1400 Km-long western coast of the peninsula of Baja California, México. At sixteen of the thirty-two sampled locations between Tijuana, B.C. and La Paz, B.C.S., transects were made at right angles to the shore to record cover and zonation of these species. Abronia maritima, was found along the entire coast and it was the major foredune-builder throughout most of its range. The ranges of most of the others species fall into one of the three groups corresponding to regions of inland vegetation and to Köppen climatic types of semi-arid (BS) south to 30°N, arid (BW) in the central part, and aris tropical (BSh) south of 30°N. Within each region the vegetation on dunes inmediately above the beach is more uniform than that on the backdunes, where the shrubby vegetation varies acording to the degree of surface stabilization

Even after the contributions of Wilbur (1987) and several recent reports in Western Birds, the distribution of many birds in Baja California remain poorly known. Observations report in this paper were made by the authors separately or together between 1975 and June 1994. But this paper only include data for northwestern Baja California, that is, between the international border and Río de El Rosario and west of the summits of the Sierras Juárez and San Pedro Mártir. Almost all the records are based on sight identifications only, owing to the difficulty, even for Mexican citizen, in complying with current collecting regulations in México. A total of 44 birds were sighted in 42 sites visited.

Point Reyes Bird Observatory organized a broad survey to quantify the importance of specific wetlands to wintering and migratory shorebirds in western North America. In wetlands along the west coast of Baja California, México, 354,905 shorebirds were estimated present in winter based on ground and air surveys between January 1991 and January 1994. The Laguna Ojo de Liebre/Guerrero Negro wetland complex held many more wintering shorebirds than any other Baja California site.

The breeding population of Snowy Plovers (Charadrius alexandrinus) was surveyed along the Pacific coast of Baja California from 1991 to 1992. All accesible potential breeding sites from Tijuana to Cabo San Lucas were covered. The 1344 adult Snowy Plovers counted were mostly distributed (88% of the total Baja California population) at the four main coastal wetland complexes of the peninsula: Bahía San Quintín, Laguna Ojo de Liebre-Guerrero Negro, Laguna San Ignacio and Bahia Magdalena. The habitats harboring the largest numbers of birds were barrier beaches and salt flat. It si concluded that the number of Snowy Plovers on the peninsula of Baja California likely represents at least 50% of the total population nesting on the west coast of North America.

En estae trabajo se presentan los resultados del censo de aprovechamiento de aguas subterraneas, hidrometría del subsuelo, determina la superficie y el tipo de cultivo en el que utiliza el agua explotada. Proporciona información acerca del grado de explotación actual del acuífero de San Quintín. Cuantifica el volumen almacenado de agua subterranea, para la aplicación de proyectos alternos de administración. Difine las areas con mayores posibilidades gehidrológicas y delimita las zonas con mala calidad de agua subterranea, además de proporcionar información de los aprovechamientos con altas concentraciones de sólidos disueltos totales.

Convención sobre el Comercio Internacional de Especies Amenazadas de Fauna y Flora Silvestres (CITES).

y Southern California Coastal Wetlands Inventory (SCCWI)

This paper describes location and main features of the larger coastal wetlands of Baja California state, including Estero de Punta Banda. It summarizes each wetland regarding its current status, ecological, scientific and recreational importance, threats to the habitats and their consequences. It mentions in what lagoons tourism activities can be carried out without diminishing the biological diversity, fishing potential and job source for local people of the wetlands. The paper also analizes the existing legal mechanisms and those to be established in order to achieve a sound management of the natural resources found in these wetlands.

A través de este trabajo se analiza el comportamiento hidrológico del arroyo Santo Domingo con el fin de decidir el tipo de obra más conveniente, entre una presa de almacenamiento y una presa derivadora, para lograr un mejor aprovechamiento de los escurrimientos superficiales en la agricultura. Se analizan varias alternativas de capacidad de almacenamiento y derivación, definiendose para cada una la mas conveniente, de acuerdo con su eficiencia al satisfacer las demandas de riego, de una zona propuesta.