GLMs relating penguin demographics to pelagic catches close to islands and to pelagic abundance
Working Paper
2010
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University of Cape Town
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Abstract
Earlier GLM analyses of the impact of pelagic fishing in the vicinities of Robben and
Dassen Islands on the dynamics of penguins breeding on those islands are
extended to cover a wider set of data series, and to consider relationships
involving sardine and anchovy separately as well as together. This in turn allows
the estimation of the change in penguin population growth rate to be expected
from suspending pelagic fishing in the vicinities of these islands. Interpretation of
results is confounded by poor precision which is a consequence of the shortness of
the time series. Likely the most that could be said with some confidence is that the
results of the analyses do not support the hypothesis that suspending fishing
around Robben and Dassen Islands would enhance penguin reproductive success
there.
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Reference:
Robinson, W., & Butterworth, D. S. (2010). GLMs relating penguin demographics to pelagic catches close to islands and to pelagic abundance. Document MCM/2010/SWG-PEL/Island Closure Task Team/19.