Tracking long-distance migration to assess marine pollution impact.
Animal tracking provides new means to assess far-reaching environmental impacts. In the aftermath of the Deepwater Horizon explosion in the Gulf of Mexico, a long-distance migrant, the northern gannet (Morus bassanus) suffered the highest oiling among beach-wrecked birds recovered. Analysis of bird-borne tracking data indicated that 25 per cent of their North American population from multiple colonies in eastern Canada migrated to the pollution zone. Findings contrasted sharply with available mark-recapture (band recovery) data. The timing of movement into and out of the Gulf indicates that immature birds would have absorbed most oil-induced mortality. Consequently, one of two outcomes is likely: either a lagged (likely difficult to assess) population decrease, or an undetectable population response buffered by age-related life-history adaptations. Tracking research is especially useful when little information on animal distributions in pollution zones is available, as is the case in the Gulf of Mexico. Ongoing research highlights current risks and conservation concerns.
Psychology Department, Memorial University, St. John's, Newfoundland, Canada. mont@mun.ca
William
W
Montevecchi
David
D
Fifield
Chantelle
C
Burke
Stefan
S
Garthe
April
A
Hedd
Jean-François
JF
Rail
Gregory
G
Robertson
D025041:Animal Migration; D000818:Animals; D001717:Birds / Q000502:physiology*; D002170:Canada; D060851:Gulf of America; D009026:Mortality; D059392:Petroleum Pollution / Q000009:adverse effects*; D058998:Remote Sensing Technology; D018570:Risk Assessment; D017215:Satellite Communications; D014481:United States; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D014874:Water Pollutants, Chemical