Seaweeds in the Southern Gulf of California

During 1993, quarterly systematic samplings were made at ten representative locations of the benthic environments of La Paz Bay. At each location we gathered algae in the subtidal and intertidal zones. We identified 126 species, of which 118 were previously reported. Eight are first records: Amphiroa beauvoisii, A. misakiensis, A. vanbosseae, A. valonioides, Dictyota cervicornis, Endoplura aurea, Hydrolithon reinboldii, and Liagora ceranoides f. leprosa. The greatest richness was at Calerita and the smallest at Isla Gaviota. The largest number of species was found in spring and the least in autumn. In La Paz Bay the phycofloristic similarity between locations was determined by the degree of exposure to surge, depth, and type of substrate. The association analysis allowed us to identify groups of species that included organisms with different morphological characteristics, from structurally simple to complex, but that share a common preference for the same type of substrate and environment. The morphology of the algae that constituted the associations was different, however the organisms had strategies to adapt, allowing coexistence in habitats with similar conditions. La Paz Bay has a great variety of environments, different types of substrates, and climatic and oceanographic conditions which change during the year. In this sense, seaweeds would be a quantitative and qualitative sign of certain environmental characteristics. If the conditions change, there will be a variation in the species expression, which can be in number or in external morphology. This will depend on their ability to adapt

Mosquito Infestation and Dengue Virus Infection in Aedes aegypti Females in Schools in Mérida, México

We determined abundance of Aedes aegypti mosquitoes and presence of dengue virus (DENV) in females collected from schools in Mérida, México, during 2008 and 2009. Backpack aspiration from 24 schools produced 468 females of Ae. aegypti and 1,676 females of another human biter, Culex quinquefasciatus. Ae. aegypti females were collected most commonly from classrooms followed by offices and bathrooms. Of these females, 24.7% were freshly fed. Examination of 118 pools of Ae. aegypti females (total of 415 females) for presence of DENV RNA produced 19 positive pools (16.1%). DENV-infected pools were detected from 11 (45.8%) of 24 schools and came from different room types, including classrooms, offices, and bathrooms. The overall rate of DENV infection per 100 Ae. aegypti females was 4.8. We conclude that schools in Mérida present a risk environment for students, teachers, and other personnel to be exposed to mosquitoes and bites of DENV-infected Ae. aegypti females