Recovery of the South American sea lion (Otaria flavescens) population in northern Patagonia
By S. Dans, E. Crespo, S. Pedraza, M. K. Alonso. 2004
83 citations recorded by the source corpus.
The size of and trend in the South American sea lion (Otaria flavescens) population located in northern Patagonia were estimated and changes in the distribution, size, and structure of individual sites were analyzed during the period 1983-2002. Total counts were made during the reproductive season. Regression models were used to analyze the trend. Pups represented around 40% of the animals counted. The annual rates of change for pups and nonpups were not significantly different (p > 0.05, n = 7), although some rookeries showed higher rates of change for pups than for nonpups. Pup numbers have been increasing at the rate of 3.4% per year at the oldest rookeries, but the rate of increase was higher at new rookeries. Using Bayes' methods, the precision of the estimates and the contribution to the abundance of each rookery produced an alternative estimate of the trend in pup numbers in 5.7%. The key in the recovery of this population includes higher survival rates of juveniles combined with increased available habitat for newly reproducing in- dividuals. This process led to the occupancy of new areas for hauling out and breeding. This hypothesis could explain the higher rates of increase in pups in peripheral areas while reproductive rates remain unchanged.
Subfields: Atmospheric Science, Ecology, Oceanography
View Paper: https://www.semanticscholar.org/paper/3c66b0d124b49afce30f22126599efe14662dfc3
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Citations in the corpus
- Multispecies modelling of some components of the marine community of northern and central Patagonia, Argentina (2005, background): “Although recent estimates of abundance indicate that this population is still below the preharvest level (Dans et al. 2004), the sea lion is today the most abundant marine mammal in the region that actually forages on the continental shelf, and hake and squid are among its main prey items (Koen-Alon”
- Whales, Whaling, and Ocean Ecosystems (2007, methodology): “Original reference: Doroshenko (1978) 2 stomachs full, 2 low 46.”