New article - A Bigger, Better Brain
Dear Colleagues, This is to announce a new feature article in the current issue of American Scientist entitled "A Bigger, Better Brain² (M. Bearzi and C. Stanford) Observations of animals as different as chimpanzees and dolphins are producing evidence of parallel types of intelligence in both, despite their vastly different morphology and native environments. One thing they have in common are uncommonly large brains when compared to their body sizes, a trait that is even more extreme in humans. The authors argue that these observations suggest that convergent evolution may have played a role in the development of humanlike intelligence in more than one recent evolutionary lineage. The article is available on the journal site: http://www.americanscientist.org/issues/feature/2010/5/a-bigger-better-brain Regards, Maddalena Bearzi ______________________________ Maddalena Bearzi, Ph.D. Ocean Conservation Society, President P.O. Box 12860 Marina del Rey, CA 90295 - USA ph.310.8225205, fax 310.8225729 mbearzi@earthlink.net http://www.oceanconservation.org
Dear Colleagues, This is to announce a new paper: Bearzi, M. and K. Patonai. 2010. Occurrence of the Barnacle (Xenobalanus globicipitis) on Coastal and Offshore Common Bottlenose Dolphins (Tursiops truncatus) in Santa Monica Bay and Adjacent Areas, California. Bull. Southern California Acad. Sci 109(2): 37-44. Abstract. Occurrence and distribution of pseudostalked barnacle (Xenobalanus globicipitis) on bottlenose dolphin (Tursiops truncatus) were assessed during a 1997 2007 study in Santa Monica Bay and nearby areas, California. During 425 surveys, 647 individuals were observed to assess presence and prevalence of barnacles; 92 barnacles on 56 individual (8.66%) were observed. On average, one barnacle was found on individuals, usually on top of dorsal fins (97.83%). No significant difference between barnacles¹ numbers on coastal versus offshore sightings was recorded. A significant difference on their occurrence on dolphins was recorded between seasons and years. Barnacles affect a small portion of the dolphin population in the study area. For a copy, you can check the journal website at http://scas.jsd.claremont.edu/publicat/index.htm, or contact: mbearzi@earthlink.net. Regards, Maddalena Bearzi ______________________________ Maddalena Bearzi, Ph.D. Ocean Conservation Society, President P.O. Box 12860 Marina del Rey, CA 90295 - USA ph.310.8225205, fax 310.8225729 mbearzi@earthlink.net http://www.oceanconservation.org
Hello everybody I asked some advise about river dolphins that were trapped in a segment of a river in Bolivia. The rescue of the trapped dolphins locally called bufeos went very well, it was a challenging experience were we learned a lot from the whole process. Finally we move them by road (very dusty and rough, but we did not have more options) it took from 15 to 20 min to the area was blocked and then by boat (by the river Rio Grande)
From the original 9 (max 12) that we initially counted, finally we rescued 20 bufeos!!!. The dolphins were trapped in an area of 1 km by 18m wide; it seems difficult to think such error on the counts. So I think it would be interesting to discuss the methods of evaluation.. we used the modified strip transect (counting around 8 times, while we were monitoring the general status of the area, or looking for possible mortality). If there is the possibility that generally we are underestimating river dolphin populations?. Because of the logistic we release them in 3 areas of the same river (rio Grande) 9 individuals 20 km from the blocked area; 7 individuals 10 km (after some rapids), and 4 individuals were released in the blocked area (were the Pailas river used to flow to the Rio Grande).. During this season (dry season) these 3 areas are divided by rapids or shallow waters, but during rising and high season the water level wont be a obstacle for the dolphins to reunite.
There were several females, 2 of them pregnant, 2 of them have newborns (both were released close to their mothers) and we saw them days later swimming together. One male dolphins surprised us because he did not have the left pectoral fin.. probably this happened long time ago,this area was completely healed (it seems that it was cut by a net), I dont know this is an frequent situation. None of them showed signs of physical damage from the rescue, of course they showed some signs of stress and some scratches from the capture but we think they are fine. Thank you for all your advise, comments, suggestions and interest. Sincerely Enzo Aliaga-RosselPhD CandidateUniversity of HawaiiEECB Program Associate ResearcherInstituto de Ecologia- UMSALa Paz-Bolivia
participants (2)
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Enzo Aliaga Rossel -
Maddalena Bearzi