Nachweis einer Kinästhetischen orientierung bei Uca rapax

Hagen, H.

doi:10.1007/bf00407383

Cited by 37 publications

(16 citation statements)

References 39 publications

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“…Foraging crabs evidently know how far away they are from their burrows because the further away they are from home, the earlier and faster they respond to an approaching dummy. We know that crabs do not see their own burrows from more than 15·cm away, so their path integration system needs to provide them with information about the direction and distance in which their burrow lies (Cannicci et al, 1999;von Hagen, 1967;Zeil, 1998;Zeil and Layne, 2002). Burrow-surveying crabs thus need to be able to integrate visual information and information from the path integration system to assess another crab's position and movement relative to the burrow.…”

Section: Discussionmentioning

confidence: 99%

Burrow surveillance in fiddler crabs I. Description of behaviour

Hemmi

Zeil

2003

Journal of Experimental Biology

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SUMMARY When defending resources, animals need to reliably detect and identify potential competitors. Animals that live at high population densities would be expected to be efficient in this aspect of resource defence since the time lost in false alarms could be substantial and the failure of identifying a competitor could be very costly. How does an animal decide whether another animal is or is not a threat to a resource or a territory? Fiddler crabs [Uca vomeris (McNeill)] operate from burrows that they guard and defend vigorously against other crabs. The crabs live in dense populations, with many animals inhabiting one square metre of mudflat. We describe here the behavioural responses of foraging crabs to repeated presentations of small crab-like dummies approaching their burrows. We explore the relationship between the probability and the timing of burrow defence responses, the crab's behavioural state, and the visual appearance and direction of approach of the dummies. We find that the probability of response of resident crabs is independent of the relative position of crab and dummy but is strongly affected by the dummy's position and movement direction relative to the crab's burrow. The critical stimuli are the dummy's distance from the crab's burrow and whether the dummy is moving towards the burrow or not. The response distance (dummy-burrow distance) increases with the crab's own distance from the burrow, indicating that the crabs modify their assessment of threat depending on their own distance away from the burrow. Differences in dummy size and brightness do not affect the probability or the timing of the response. We discuss these results in the context of fiddler crab social life and, in a companion paper, identify the visual and non-visual cues involved in burrow defence.

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Section: Discussionmentioning

confidence: 99%

Burrow surveillance in fiddler crabs I. Description of behaviour

Hemmi

Zeil

2003

Journal of Experimental Biology

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“…They are central-place foragers with a uniquely strong attachment to their point of reference (von Hagen, 1967;Land and Layne, 1995;Zeil, 1998;Layne et al, 2003). Indeed, they maintain a fairly rigid orientation relative to it by pointing the transverse axis of their body more or less towards home throughout their foraging excursions.…”

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confidence: 99%

“…However, evidence for the cues relevant to this task is largely inconclusive or incomplete (Vannini and Cannicci, 1995), and we are still largely ignorant of the sensory systems involved. The fact that all fiddler crab species tested ignore landmarks near their burrows when displaced a short distance (von Hagen, 1967;Zeil, 1998;Cannicci et al, 1999;Layne et al, 2003) suggests that the relevant spatial information does not include local landmarks. However, it may still include global cues, such as the sun, and it has been suggested that fiddler crabs use an exocentric compass to maintain body orientation (Zeil, 1998).…”

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confidence: 99%

Mechanisms of homing in the fiddler crabUca rapax2. Information sources and frame of reference for a path integration system

Layne

Barnes

Duncan

2003

Journal of Experimental Biology

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In order to return to a place they have previously visited, many animals use a form of coding of their movements, called path integration by Mittelstaedt and Mittelstaedt (1980), wherein information arising from the animal's own movement is used to update the animal's memory of its position continuously in the form of a vector joining the animal's current location with the goal (for example reviews, see

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“…The American lobster Homarus americanus Milne-Edwards, 1837(KARNOTSKY et al, 1989, the crabs Inachus phalangium (Fabricius, 1775) (DIESEL, 1986) and Thalamita crenata (Milne-Edwards, 1834) (CANNICCI et al, , 2000, and the crayfish Cherax destructor Clark, 1936 (VARJU andSANDERMAN, 1989) showed to return to their shelter or to the shelter of the mating females by the use of some cues from the environment. Several species of Uca, as well as other ocypodids living on muddy or sandy flats, have proved capable of relocating their hole in a straight line after short excursions of various degrees of complexity by relying on idiothetic (or kinesthetic) mechanisms (VON HAGEN, 1967).…”

Section: Discussionmentioning

confidence: 99%

Experimental Evidence for Homing in the Red Swamp Crayfish, Procambarus Clarkii

Barbaresi

Gherardi

2006

Bull. Fr. Pêche Piscic.

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The red swamp crayfish, Procambarus clarkii, is an efficient burrower, but its burrow fidelity has been recently questioned. In this study, we aimed at investigating whether individuals of this species are capable to learn the position of a goal (a wet burrow hidden to their sight) in experimental tanks and to make more efficient with time their oriented movement towards it. We also analyzed crayfish behavior after having closed one of the two accesses to the goal. Indeed, in successive trials we recorded the crayfish tendency to reduce the distance covered to reach the goal and the time taken, except when they were already familiar to the experimental setting. Memory of the spatial configuration lasted for 16 hours at least and crayfish learned and maintained individual trajectories. The interruption of their usual path always caused a drastic increase of distance and time that however decreased in the successive trials. This study provided also some information of the sensory channels used by P. clarkii to orient. This crayfish, which can be active also during daytime, seemed to adopt a combination of tactile and visual information, together with the possible use of cues (i.e. humidity cues) emitted by the goal. Future studies should clarify the paradox of a crayfish species whose individuals, although being physiologically capable to home, seem not to return to the previously occupied burrows at the end of their foraging excursions, notwithstanding the time and energy expended to excavate them.Key-words: spatial learning, red swamp crayfish, Procambarus clarkii. PREUVE EXPÉRIMENTALE DU HOMING CHEZ L'ÉCREVISSE DE LOUISIANE, PROCAMBARUS CLARKII RÉSUMÉL'écrevisse rouge de Louisiane, Procambarus clarkii, est un fouisseur efficace, mais sa fidélité au terrier a été récemment mise en doute. Lors de cette étude, nous avons étudié la capacité des individus de cette espèce à mémoriser la position d'un but (un terrier humide caché à leur vue) dans des réservoirs expérimentaux et à optimiser leurs déplacements. Nous avons également analysé le comportement de l'écrevisse après avoir clos un des deux accès au but. En effet, dans des épreuves successives nous avons Bull. Fr. Pêche Piscic. (2006) 380-381 : 1145-1154 -1146 -constaté la tendance de l'écrevisse à réduire la distance couverte pour atteindre le but, et la durée du déplacement, sauf lorsqu'ils étaient déjà familiarisés avec l'arrangement expérimental. La mémoire de la configuration spatiale a duré au moins pendant 16 heures et l'écrevisse a appris et maintenu une trajectoire individuelle. L'interruption de leur chemin habituel a toujours causé une augmentation énergique de la distance et de la durée du trajet, qui a cependant diminué lors des tentatives successives. Cette étude a fourni également quelques informations des canaux sensoriels employés par P. clarkii pour s'orienter. L'écrevisse, qui peut être en activité également pendant la journée, a semblé adopter une combinaison d'informations tactiles et visuelles, ainsi que l'utilisation possible des ...

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Nachweis einer Kinästhetischen orientierung bei Uca rapax

Cited by 37 publications

References 39 publications

Burrow surveillance in fiddler crabs I. Description of behaviour

Burrow surveillance in fiddler crabs I. Description of behaviour

Mechanisms of homing in the fiddler crabUca rapax2. Information sources and frame of reference for a path integration system

Experimental Evidence for Homing in the Red Swamp Crayfish, Procambarus Clarkii

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