Funktionsmechanismus der Autotomie bei Spinnen (Araneae) und seine morphologischen Voraussetzungen

Bauer, Karl Heinz

doi:10.1007/bf00391551

Cited by 10 publications

(5 citation statements)

References 8 publications

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“…This facilitates (4) the wound healing and regeneration of the discarded part. This concept of autotomy has been largely accepted by subsequent authors (McVean, 1975), and verified for such animals as salamanders (Wake & Dresner, 1967), lizards (Sheppard & Bellairs, 1972), spiders (Bauer, 1972), and crabs (McVean, 1973).…”

Section: Discussionmentioning

confidence: 88%

“…It is a further indication of the elusiveness of the Echinodermata that the voluntary loss of a healthy appendage or part of the body is ultimately dependent on changes in the mechanical properties of the connective tissue, while in other phyla such an extreme measure is accompanied by violent muscular activity (Wake & Dresner, 1967;Bauer, 1972;Sheppard & Bellairs, 1972;McVean, 1973).…”

Section: Mechanism Of Autotomymentioning

confidence: 99%

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Arm autotomy in brittlestars (Echinodermata: Ophiuroidea)

Wilkie

1978

Journal of Zoology

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Although ophiuroid arm shedding has long been accepted as an example of autotomy, there has been little investigation of the phenomenon to substantiate this. This paper describes the outwardly visible aspects of autotomy and the function of the internal components of the arm during detachment. Observations are focussed on Ophiocomina nigra, some comparisons being made with eight other species. Ophiuroid autotomy is characterized by its occurrence close to the point of stimulation, its rapidity, and by the pattern of intervertebral muscle separation at the insertions which is constant for a given species. Evidence is presented showing the important role played by the intervertebral ligament. Both this and the muscle insertions are collagenous, and it is suggested that they and the other intersegmental connective tissues facilitate autotomy by undergoing a drastic, nervously mediated loss in tensile strength which enables the animal to part from its arm with a minimum of effort. Comparable properties have been ascribed to other echinoderm connective tissues, and their role in asteroid and holothurian autotomy has been acknowledged, but such a mechanism has not previously been suggested for ophiuroid arm autotomy.

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Section: Discussionmentioning

confidence: 88%

Section: Mechanism Of Autotomymentioning

confidence: 99%

Arm autotomy in brittlestars (Echinodermata: Ophiuroidea)

Wilkie

1978

Journal of Zoology

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“…This is followed by muscle contraction around the internal margin of the coxa to close the wound and minimize hemolymph loss (after Wood 1926;Bauer 1972). In some cases, autospasy can occur at the patella-tibial joints in certain longlegged Linyphiidae and perhaps Filistatidae (Roth & Roth 1984).…”

Section: Discussionmentioning

confidence: 97%

“…In most spiders, limb separation involves rupture at the coxa-trochanter boundary, achieved by snapping the coxa upwards while the femur is kept static (Bauer 1972). This is followed by muscle contraction around the internal margin of the coxa to close the wound and minimize hemolymph loss (after Wood 1926;Bauer 1972).…”

Section: Discussionmentioning

confidence: 99%

The Utility of Molecular Markers From Non-Lethal Dna Samples of the Cites Ii Protected “Tarantula” Brachypelma Vagans (Araneae, Theraphosidae)

Longhorn

Nicholas²,

Chuter

et al. 2007

Journal of Arachnology

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“…Heuts & Lambrechts 1999). The left-side vulnerability may be due to anatomical factors ( joint strength and leg length; see, e.g., Bauer 1972) and/or a complex of various behavioral factors such as a propensity to move the legs of one side when alarmed, or left/right attack biases in spider predators (a possibility clearly discussed by V&R). We could not demonstrate a significant difference between the length of left and right legs (by measuring dead specimens and pictures in Roberts 1984;.…”

Section: Behavioral Left-right Asymmetry Extends To Arthropodsmentioning

confidence: 99%

survival with an asymmetrical brain: advantages and disadvantages of cerebral lateralization

2005

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Recent evidence in natural and semi-natural settings has revealed a variety of left-right perceptual asymmetries among vertebrates. These include preferential use of the left or right visual hemifield during activities such as searching for food, agonistic responses, or escape from predators in animals as different as fish, amphibians, reptiles, birds, and mammals. There are obvious disadvantages in showing such directional asymmetries because relevant stimuli may be located to the animal's left or right at random; there is no a priori association between the meaning of a stimulus (e.g., its being a predator or a food item) and its being located to the animal's left or right. Moreover, other organisms (e.g., predators) could exploit the predictability of behavior that arises from population-level lateral biases. It might be argued that lateralization of function enhances cognitive capacity and efficiency of the brain, thus counteracting the ecological disadvantages of lateral biases in behavior. However, such an increase in brain efficiency could be obtained by each individual being lateralized without any need to align the direction of the asymmetry in the majority of the individuals of the population. Here we argue that the alignment of the direction of behavioral asymmetries at the population level arises as an "evolutionarily stable strategy" under "social" pressures occurring when individually asymmetrical organisms must coordinate their behavior with the behavior of other asymmetrical organisms of the same or different species.

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Funktionsmechanismus der Autotomie bei Spinnen (Araneae) und seine morphologischen Voraussetzungen

Cited by 10 publications

References 8 publications

Arm autotomy in brittlestars (Echinodermata: Ophiuroidea)

Arm autotomy in brittlestars (Echinodermata: Ophiuroidea)

The Utility of Molecular Markers From Non-Lethal Dna Samples of the Cites Ii Protected “Tarantula” Brachypelma Vagans (Araneae, Theraphosidae)

survival with an asymmetrical brain: advantages and disadvantages of cerebral lateralization

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