Biology, Evolution and Conservation of River Dolphins Within by Manuel Ruiz-garcia, Joseph Mark Shostell

By Manuel Ruiz-garcia, Joseph Mark Shostell

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Fishing nets were counted regardless of if they were deployed or in canoes. Fish cages were used to hold live fish that had been caught in nets. In Venezuela, potential prey fish were collected with seines and an experimental gill net (see McGuire & Winemiller, 1998 for details), and catch per unit effort (CPUE) was calculated by dividing the total number of fishes caught by either the total number of meters the seine was pulled or by the total number of minutes the gill net was in the water. Rates of Travel Rates of travel were calculated for individual dolphins seen in multiple times during the course of a survey trip (which was typically 7-12 days in Bolivia and Peru, and 6 months in Venezuela).

Mcguire and Enzo Aliaga-Rossel INTRODUCTION River dolphins live in an environment that is less-stable and more spatially complex than the ocean, where most odontocetes (toothed whales) occur. Yearly seasonal fluctuations in river levels may be as great as 20 meters and these differences result in seasonal extremes in quality and quantity of aquatic habitat available to river dolphins. Dolphins restricted to deep waters of river channels, confluences, and seasonally isolated oxbow lakes during the dry season are free to swim through submerged primary rainforest and across the llanos (grassland plains) during the height of the rainy season.

A. (1993) FAO species identification guide, Marine mammals of the world, Rome, Italy: Food and Agriculture Organization of the United Nations (FAO). , Rosas, F. C. , & Readman, J. W. (2004). Contamination by persistent organochlorines in cetaceans incidentally caught along Brazilian coastal waters. Archives of Environmental Contamination and Toxicology, 46, 124-134. , Sinha, R. , Ichihashi, H. and Tatsukawa, R. (1993). Heavy metals and organochlorine residues in Ganges River dolphins from India.

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