Final answer:
Gerrie et al. (2006) is a study likely related to biology, but without specifics, a detailed analysis cannot be provided. Refer directly to the article for an accurate understanding of their research.
Step-by-step explanation:
The specific study by Gerrie et al. (2006) is not detailed within the question. However, considering the context of the references provided, it could be related to the field of Biology, possibly focusing on genetics, environmental science, evolutionary biology, or related research. For a precise overview, one should refer directly to the article titled by Gerrie et al. (2006) for the methodology, results, and conclusions of their study.