River Flow And Temperature Limit Trout Numbers

[Achilles Tang]

Scientists have found the mechanism that controls the number of salmonids found each year in Cantabrian rivers. Their method has been to monitor population numbers in relation to river flow in March, when the juvenile fish emerge. They have concluded that environmental conditions change each year and that modified river flow, positively or negatively affects survival rates. This information throws light on a long debate within ecological theory about the mechanisms that regulate the size of animal populations.

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