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Monitoring marine populations and communities: methods dealing with imperfect detectability

Katsanevakis, Stelios; Weber, Anke; Pipitone, Carlo; Leopold, Mardik; Cronin, Michelle; Scheidat, Meike; Doyle, Thomas K.; Buhl-Mortensen, Lene; Buhl-Mortensen, Pål; D’Anna, Giovanni; de Boois, I.J.; Dalpadado, Padmini; Damalas, Dimitrios; Fiorentino, Fabio; Garofalo, Germana; Giacalone, Vincenzo Maximiliano; Hawley, Kate; Issaris, Yiannis; Jansen, J.; Knight, Carolyn; Knittweis, Leyla; Kröncke, Ingrid; Mirto, Simone; Muxika, Iñigo; Reiss, Henning; Skjoldal, Hein Rune; Vöge, Sandra
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/109273
Date
2012-06-26
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Original version
http://dx.doi.org/10.3354/ab00426
Abstract
Effective monitoring of populations and communities is a prerequisite for ecosystembased

management of marine areas. However, monitoring programs often neglect important

sources of error and thus can lead to biased estimates, spurious conclusions and false management

actions. One such source of error is ‘imperfect detectability’, i.e. the inability of investigators

to detect all individuals or all species in a surveyed area. Although there has been great effort to

develop monitoring methods that account for imperfect detectability, the application of such methods

in the marine environment is not as apparent as in other systems. Plot sampling is by far the

most commonly applied method for biological monitoring in the marine environment, yet it largely

ignores detectability issues. However, distance sampling, mark-recapture methods, repeated

presence-absence surveys for occupancy estimation, and removal methods do estimate detection

probabilities and provide unbiased estimates of state variables. We review these methods and the

relevant tools for their application in studies on marine populations and communities, with the aim

of assisting marine biologists and managers to understand the limitations and pitfalls associated

with some approaches and to select the best available methods for their monitoring needs.
Publisher
Inter-Research
Journal
Aquatic Biology

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