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.2005 Jun 22;1(2):147-50.
doi: 10.1098/rsbl.2005.0313.

Periodic variability in cetacean strandings: links to large-scale climate events

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Periodic variability in cetacean strandings: links to large-scale climate events

K Evans et al. Biol Lett..

Abstract

Cetacean strandings elicit much community and scientific interest, but few quantitative analyses have successfully identified environmental correlates to these phenomena. Data spanning 1920-2002, involving a total of 639 stranding events and 39 taxa groups from southeast Australia, were found to demonstrate a clear 11-13- year periodicity in the number of events through time. These data positively correlated with the regional persistence of both zonal (westerly) and meridional (southerly) winds, reflecting general long-term and large-scale shifts in sea-level pressure gradients. Periods of persistent zonal and meridional winds result in colder and presumably nutrient-rich waters being driven closer to southern Australia, resulting in increased biological activity in the water column during the spring months. These observations suggest that large-scale climatic events provide a powerful distal influence on the propensity for whales to strand in this region. These patterns provide a powerful quantitative framework for testing hypotheses regarding environmental links to strandings and provide managers with a potential predictive tool to prepare for years of peak stranding activity.

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Figures

Figure 1
Figure 1
Frequency of stranding events (a) for Tasmania (1920–2002) and (b) Victoria (1920–1980) in relation to FFT coefficients at 11.9 years (Tasmania) and 11.6 years (Victoria) and results of lag analysis demonstrating positive correlations at lags of (c) 11 and 12 years (Tasmania) and (d) 12 years (Victoria). Asterisks represent significant correlations at the 95% level.
Figure 2
Figure 2
Relationship between stranding events and (a) an annual index of zonal (westerly) wind strength (R2=0.2;y=1.5x−1.2); (b) an annual index of meridional (southerly) wind strength (R2=0.3;y=6.0x−2.1); (c) mean summer sea-surface temperatures collected from Maria Island, Tasmania (R2=0.2;y=58.4−3.3x).
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References

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