The specific characteristics of biological analysis of each Artemia population allows the evaluation, from the evolutionary point of view, the range of particular habitat answers of one strain to an specific environment, like the morphometric differentiation and isolation reproduction. In this work seven Artemia franciscana strains were morphometric and reproductive...
Fisheries activities produce large quantities of non-recycled wastes all over the world. In Mexico, shrimp commercial captures and cultures generate high quantities of non-used heads. It is calculated that these wastes reach up to 32,000 annual tons and only 5% is converted in shrimp meal. In the present work we...
The present work was carried out in the lacustrine basin of Metztitlan, Hgo., three sampling of recent sediments were realized in November (2001), April and July (2002) and the organisms of the genus Oreochromis sp were evaluated in April and July (2002). The analyses did following the methodology proposed by...
The natural protected area Corredor Biológico Chichinautzin (CBC) has a great habitat richness directly related to its geographic, climatic, geologic location and wide altitudinal range. Environmental conditions allows the establishment of a great variety of plant communities with a monocots richness of 24 families, 123 genera and 313 species. Such...
The Huatulco Bays have a great variety of environments and habitats, and there are organisms, which have been few studied. In this respect, they are few studies on the community of fish that inhabit these subsystems. In the present study, the composition, diversity, distribution and abundance of fishes were evaluated...
The worlwide expansion experienced by aquaculture in the last years has improved the culture techniques used to manage large densities of organisms in reduced spaces. This has induced, on one side, increased aquaculture production yields, but has also given rise to higher rates of diseases in cultured organisms, causing high...
Las especies incluidas dentro de la familia Thelypteridaceae se encuentran ampliamente representadas en las zonas tropicales de México. La morfología del esporófito ha sido estudiada por los taxónomos, sin embargo, el gametófito de este grupo de plantas es poco conocido. Con la finalidad de aportar conocimientos acerca de la morfogénesis...
The “peces blancos” (Chirostoma estor, C. humboldtianum, C. lucius, C. promelas and C. sphyraena) are species of great economical and cultural interest in Mexico’s Mesa Central. Their actual wild populations had dramatically decreased mainly because of the introduction of other species, the detrimental environmental conditions and high fishing pressure. This...
Durante un ciclo anual (2002-2003) se determinaron las diferencias y/o semejanzas en las asociaciones fitoplanctónicas, a nivel espacial y temporal, entre las lagunas costeras Chantuto-Panzacola y Carretas-Pereyra (Chiapas), así como su relación con las variaciones de los parámetros físicos y químicos que caracterizan a cada uno de los sistemas lagunares....
The patterns of distribution of twenty-seven species of pteridophytes were studied, as possible indicators of environment deterioration in the temperate forest of San Jeronimo Amanalco, Texcoco, Mexico State. The presence and abundance of Pteridophyta was related with edaphic, topographic and vegetation variables at 100 sampling sites in an area of...
