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MEPS
Marine Ecology Progress Series

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MEPS 478:303-305 (2013)  -  DOI: https://doi.org/10.3354/meps10338

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Assessment of long-distance detection of gillnets by porpoises: Reply to Dawson & Lusseau (2013)

Torben P. Nielsen1,*, Magnus Wahlberg2, Torben Dabelsteen1

1Department of Biology, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark
2Marine Biological Research Laboratory, University of Southern Denmark, Hindsholmsvej 11, 5300 Kerteminde, Denmark

ABSTRACT: Nielsen et al. (2012; Mar Ecol Prog Ser 453:241-248) analyzed surface observations of harbour porpoises in a small coastal area where a modified gillnet was introduced at randomized time intervals. The study concluded that porpoises reacted to the gillnet at surprisingly large distances (in some cases >80 m). Dawson & Lusseau (2013; Mar Ecol Prog Ser 478:301-302) argue that the conclusions of Nielsen et al. (2012) are undermined by pseudo-replication (a matter of concern in many field studies of marine mammals). We acknowledge these concerns, but we think that the conclusions of Nielsen et al. (2012) remain valid, as the data are best explained by harbour porpoises being able to detect and avoid gillnets at very long ranges.


KEY WORDS: Harbour porpoise · Phocoena phocoena · Echolocation · Gillnet detection · Pseudo‑replication


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Cite this article as: Nielsen TP, Wahlberg M, Dabelsteen T (2013) Assessment of long-distance detection of gillnets by porpoises: Reply to Dawson & Lusseau (2013). Mar Ecol Prog Ser 478:303-305. https://doi.org/10.3354/meps10338

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