Aerial surveys to monitor bluefin tuna abundance and track efficiency of management measures
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...281 Moreover, these predation pressure estimates are based on calculations performed for the three 282 years (2011-2013) when tuna biomass was relatively high and sardine and anchovy biomass was 283 already relatively low (Van Beveren et al. 2014, Bauer et al. 2015)....
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...Annual ABFT abundances (2011-2012) were 101 obtained from aerial surveys (Bauer et al. 2015)....
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...…aerial surveys have been performed between June and October from 2000 to 2003 and from 2009 until present in the Gulf of Lions to construct a unique fishery-independent index of tuna density (Fromentin et al. 2003; Bonhommeau et al. 2010; Fromentin, Bonhommeau & Brisset 2013; Bauer et al. 2015)....
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...Furthermore, 74 ABFT abundance in the Gulf of Lions has been much higher in recent years (Bauer et al. 2015)....
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...Using the annual estimates of bluefin tuna densities given by Bauer et al. (2015), we calculated the abundance of tuna in the studied area by simply multiplying those annual densities with the surface area of the aerial survey transects....
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"Aerial surveys to monitor bluefin t..." refers methods in this paper
...According to common practice, we discarded 5–10% of the largest distances, which correspond in the present study to a band width of 4.5 and 3.5 km (Buckland et al. 1993)....
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"Aerial surveys to monitor bluefin t..." refers background in this paper
...(4) r (r − 1) i=1 6 R. K. Bauer et al.: Aerial surveys to monitor bluefin tuna abundance 208 209 210 211 212 213 214 215 216 217 Spatial distribution of tuna schools As population size fluctuates, the habitat used by a species can also fluctuate (MacCall’s theoretical basin model; MacCall 1990)....
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