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Dolphins, whales and porpoises : 2002-2010 conservation action plan for the world's cetaceans
Consistent evaluation and new recommendations for action are required of protective measures to address threats that were unrecognised or non-existent until recently. Global warming, noise pollution…
Group size and distributional range of the franciscana, Pontoporia blainvillei
A preliminary overview of skin and skeletal diseases and traumata in small cetaceans from South American waters
This study demonstrates the utility of a continent-wide analysis to discern epizootiological trends more readily than any local study could provide and underscores the need for focussed research on the effects of human activities on the spread of diseases in cetaceans, particularly in near-shore populations that utilize highly degraded coastal habitats.
Food habits of the South American sea lion, Otaria flavescens, off Patagonia, Argentina
These stomach content analyses indicate that South American sea lions feed primarily on demersal and ben- thic species and, in general terms, use resources according to their environ- mental availability.
Food habits of Dipturus chilensis (Pisces: Rajidae) off Patagonia, Argentina
The food habits of the beaked skate were studied utilising 274 individuals obtained from the incidental catches of the Argentine hake fishery, and two size-related dietary shifts previously reported in this species were confirmed and related to changes in habitat utilisation.
Abundance of small cetaceans in waters of the central Spanish Mediterranean
- A. Gómez de Segura, E. Crespo, S. Pedraza, P. Hammond, J. Raga
- Environmental Science, Physics
- 16 May 2006
Seasonal aerial surveys conducted in the waters of the central Spanish Mediterranean from 2001 to 2003 using the line transect sampling methodology to estimate cetacean abundance provide valuable biological information useful to develop conservation plans and establish a baseline for future population trend studies.
Fishery and Ontogenetic Driven Changes in the Diet of the Spiny Dogfish, Squalus acanthias, in Patagonian Waters, Argentina
- M. K. Alonso, E. Crespo, N. García, S. Pedraza, P. A. Mariotti, N. Mora
- Environmental ScienceEnvironmental Biology of Fishes
- 1 February 2002
In the present study, carried out in 1998, squid was the most important prey, followed by the hake, related to the major decrease of hake due to overfishing and the increase of squid abundance between 1994 and 1999.
Recovery of the South American sea lion (Otaria flavescens) population in northern Patagonia
The key in the recovery of this population includes higher survival rates of juveniles combined with increased available habitat for newly reproducing in- dividuals and this hypothesis could explain the higher rates of increase in pups in peripheral areas while reproductive rates remain unchanged.
Direct and Indirect Effects of the Highseas Fisheries on the Marine Mammal Populations in the Northern and Central Patagonian Coast
Monitoring of interactions between marine mammals and fisheries along the Atlantic Patagonian coast found that mortality rates seem to be low and there is insufficient evidence of competition for prey species, however, there is concern about the large amounts of fish discarded by the fishery.
Dusky dolphin and tourist interaction: effect on diurnal feeding behavior
- S. L. Dans, E. Crespo, S. Pedraza, Mariana Degrati, G. V. Garaffo
- Environmental Science
- 13 October 2008
It is found that boat presence negatively affects the longer-term feeding efficiency of dusky dolphins and the time to return to feeding as well as the time it took for a group of dolphins to feed increased in the presence of commercial vessels.