Laonome calida Capa, 2007, a feather-duster worm discovered in 2007 in estuaries and open water of tropical and subtropical Australia, was recently found at many locations in fresh and brackish waters of the delta region of the rivers Rhine, Meuse, and Scheldt in the Netherlands. Morphological differences between specimens from Australia and the Netherlands are insufficient to warrant specific distinction. A recent translocation from Australia to Europe, or from a third country to both, may explain the disjunct distribution of this species. A table with translocated and cryptogenic sabellids reported to date is provided.
The distribution and abundance of marine mammals along the United States coast of the Gulf of Mexico are well-documented, but similar studies for the Mexican coast of the Gulf of Mexico are lacking. Furthermore, these animals are important indicators of the marine ecosystem health, and scientific research is needed to develop appropriate conservation strategies. Thus, the objective of this study was to determine the diversity, distribution, and relative abundance of marine mammals in the northern coasts of Veracruz, Mexico. Boat-based surveys and aerial surveys were carried out from March 2005 to August 2006. The following species were observed: bottlenose dolphins (Tursiops truncatus), spotted dolphin (Stenella attenuata), spinner dolphin (S. longirostris), roughtoothed dolphin (Steno bredanensis), pilot whale (Globicephala macrorhynchus), and an unidentified species of a dolphin. Also, the remains of a sperm whale (Physeter macrocephalus) and a humpback whale (Megaptera novaeangliae) were observed. The Margalef Diversity Index showed a value of 1.82 for the entire study area. There were differences in the species sightings across seasons. The abundance for the entire study area was 10,824 (%CV 25.05); the density was 1.45 cetaceans/km 2 (%CV 25.05), and the cluster density was 0.71 cetaceans/km 2 (%CV 15.25). The dry season showed a relative abundance of 1.98 cetaceans/h; the rainy season, 1.07 cetaceans/h; and the cold front season, 1.28 cetaceans/h. This is a first glimpse of cetacean population sizes in Mexico. Mexican authorities consider all marine mammal species to be under some conservation status, but they do not have population estimates. Supplementary studies will extend the information presented here for further refinement of cetacean diversity and distribution in Mexican waters of the Gulf of Mexico. Special effort is needed in deeper waters of the Mexican part of the Gulf of Mexico since there is no information about diversity and abundance of marine mammals for those areas.
Se presenta la lista de esponjas marinas (Porifera: Demospongiae) del arrecife Tuxpan, Veracruz, México, colectadas en 2004, 2005 y 2006 mediante buceo libre y con equipo autónomo SCUBA. Los resultados muestran la presencia de 18 especies pertenecientes a 13 géneros y 13 familias, 17 de estas especies son nuevos registros para los arrecifes coralinos del norte de Veracruz y una (Aplysina cauliformis Carter, 1882) para el estado. La información puede auxiliar para defi nir las estrategias de manejo, monitoreo y protección de estas formaciones arrecifales que recientemente han sido propuestas como área de protección de fl ora y fauna.
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