Ecological Archives E088-122-A1
نویسندگان
چکیده
By combining expressions A.1 and A.2 it becomes clear that the variance ratio is equal to 1 when the sum of population covariances is zero (population dynamics are independent), whereas values greater (less) than 1 indicate positive (negative) covariances and thus synchronous (compensatory) dynamics amongst populations. The variance ratio reflects the cumulative population dynamics rather than the pair-wise dynamics; while some fraction of the n populations may be positively associated in time, another fraction could be negatively associated leading to cumulatively independent population dynamics.
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