Specificity of the host recognition behaviour of larval Unionicola (Acari: Unionicolidae): the effects of larval ontogeny and early larval experience

Article Abstract:

Strong proof has been found regarding the behavioural specificity of larval mites on Pyganodon cataracta and Utterbackia imbecillis. This host specificity plays a significant role in keeping reproductive isolation between these mussel-mite populations. Unionicola formosa and U. foili from P. catarcta and U. imbecillis may be distinct species. This study also suggests that the pattern of presence of host mussel species could considerably reduce the impact of behaviour specificity and decrease the level of isolation between host-related water mite populations.

Symbiosis, Mites

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Do humpback whales exhibit lateralized behaviour?

Article Abstract:

Humpback wells appear to exhibit some behavioral asymmetries, possibly the result of asymmetry of function in motor or sensory representations. Observation of humpback wells revealed that flippering movements appeared to be lateralized in over half pf the whales looked at. Moreover, facial abrasions resulting from bottom feeding were found on only one side of the face of most whales, though the sides were different for individual whales.

Humpback whale, Laterality

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Effect of watercourse characteristics on food-caching behaviour by European beaver, castor fiber

Article Abstract:

The relations between watercourse depth and width, and the occurrences, time of initiation and finite size of beaver food caches are examined. The conclusion states that there are no significant differences in watercourse width between the two groups.

Evaluation, Beavers

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