Guarded resources: the effect of intruder number on the tactics and success of defenders and intruders

Article Abstract:

Competitive tactics used by a giant danio fish (Danio aequipinnatus) in their defending of food source or during intruding behavior are determined by the number of intruders, while the number of chases is decisive for the smaller zebrafish's (Danio rerio) intruding behavior. The less the intruders, the more the larger fish's chase frequency and speed become, and vice versa. The large number of intruders and the high level of competition among themselves influence the smaller fish's foraging behavior.

Analysis, Aggressive behavior in animals, Animal aggression, Animal feeding and feeds

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Do parental convict cichlids of different sizes value the same brood number equally?

Article Abstract:

The amount of parental investment in a current brood is a problem, as brood defence costs in terms of energy and risk. A study was undertaken to determine if the same number of offspring is equally valued by female convict cichlids, Cichlasoma nigrofasciatum, with different body weights. A negative correlation between the weight of the convict cichlid and her investment in defence against a model brood predator for a brood reduced to 100 eggs is reported.

Observations, Cichlidae, Cichlids

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Direction of predator approach and the decision to flee to a refuge

Article Abstract:

Woodchucks flee to their burrows when potential predators appear. They have to judge the moment of flight correctly to avoid wasting time or delaying too long and risking attack. Woodchucks will tend to flee earlier if they are further away from their burrows and also if the burrow lies between the observer and the woodchuck. Measurement of the flight patterns of young woodchucks shows that they give themselves a safety margin of some 7.6 meters.

Alarm responses (Animal behavior), Marmots, Alarm reaction

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