Solar activity and hare dynamics: a cross-continental comparison

Article Abstract:

Sinclair et al. (1993) claim a strong association between solar activity and cyclic dynamics of Canadian snowshoe hare populations. They suggest that solar activity indirectly modulates the snowshoe hare cycle via an amplified climate cycle influencing the boreal forest ecosystem. They go on to predict that hare cycles in Siberia should be in phase with hare cycles in North America. However, evidence indicates that New and Old World hare populations do not fluctuate in phase. Furthermore, evidence indicates discrepancies among hare time series in North America.

Environmental aspects, Solar activity, Hares

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Measuring the mating skew

Article Abstract:

A statistically robust method for correcting the skew index for random variation in male mating success on leks is proposed. An iterative method is used to determine the most probable distribution in terms of the skew parameter lambda for expected mating success. The absence of a priori information regarding male ranking order is assumed. The measure covers the range of lambda that can produce the observed pattern on small and large leks.

Lek behavior, Sexual selection in animals, Sexual selection (Natural selection)

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Nonlinear dynamics and the evolution of semelparous and iteroparous reproductive strategies

Article Abstract:

A comparison is presented between semelparity, or reproducing only once, and iteroparity, or reproducing several times. It is posited that nonstable population dynamics allow for long-term persistence of both types of reproductive strategies.

Finland, Statistical Data Included, Usage, Sexual behavior in animals, Animal sexual behavior, Nonlinear functional analysis, Family size, Parturition, Parturition (Animals)

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