A neural model for localizing targets in space accomplished by the eye of a mantis shrimp

Iacino, L.; Stefano, Gioia Di; Schiff, H.

doi:10.1007/bf00202755

Cited by 13 publications

(6 citation statements)

References 17 publications

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“…Position of eyes during visual attention is different among species: in Squilla and Hemisquilla, the longer axis of the eye is kept almost vertically, but in Gonodactylus and in Pseudosquilla it is dorsal, horizontal. Regions of high visual acuity coincide with maximum overlap of visual fields (Di Iacino et al, 1990); these are found in front of the two halves and the mb in Squilla, but at the frontal, distal tip in Gonodactylus (Schiff, 1989b). During dark adaptation, the accessory pigment cells, attached to the cornea and to the retinula cells, pull the latter toward the cornea.…”

Section: Shallow Subtidal Environmentmentioning

confidence: 97%

An introductory survey of ecology and sensory receptors of tropical eastern pacific crustaceans

Schiff

Hendrickx

1997

Italian Journal of Zoology

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A comparative survey of sensory organs (mainly visual) of 35 species of crustaceans (Mysidacea, Stomatopoda and Decapoda) was initiated in the SE Gulf of California, Mexico, an enclosed sea which has been well studied for its physical conditions and the taxonomy of crustacean species. The purpose of this survey was to study how the perceptive capacities are conditioned by the signals arriving from their environment. Studied species were sampled from terrestrial, intertidal, subtidal and deep sea habitats. Our data indicate that down to 200 m there seems to be not much difference of skewing patterns in stomatopods. Eyes are adapted to local conditions. In crabs and stomatopods, ommatidia are aligned in a vertical array along the longer axis of the eye. Visual fields of ommatidia overlap. This could emphasize, for instance, the horizontal motion of vertical edges. Deep-sea crustaceans still have eyes, but in the same habitat species with apparently functional eyes occur together with species with strongly reduced eyes. When eyes are reduced, nervous structures are still observable but not ommatidia. Almost all species studied have extra-organs in the eye. These are mechano-(crabs) or chemo-(deep-sea crustaceans) receptors or else organs which seem to have a specific (e.g. adaptation) visual task (shrimps). All extra-organs have small ganglia and nerves contacting the visual ganglia on their way towards the brain.

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Section: Shallow Subtidal Environmentmentioning

confidence: 97%

An introductory survey of ecology and sensory receptors of tropical eastern pacific crustaceans

Schiff

Hendrickx

1997

Italian Journal of Zoology

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“…These taxa possessed stalked compound eyes, presumably of the appositiontype, as do extant decapod larvae and stomatopods (e.g. Land 1981, Di Stefano et al 1990, Iacino et al 1990, Cronin et al 1994. These eyes provided a panoramic view of the environment and, if the eyes of contemporary stomatopods are instructive, were probably adapted to turbid waters in at least 4 ways.…”

Section: Crustaceansmentioning

confidence: 99%

Turbidity, arthropods and the evolution of perception:toward a new paradigm of marine phanerozoic diversity

Marcotte¹

1999

Mar. Ecol. Prog. Ser.

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Geological, paleo-oceanographic and paleoclimatological studies have independently demonstrated that the volume of preserved marine sediments, eustatic sea level, the depth to which the sea was oxygenated, the concentration of atmospheric oxygen and carbon dioxide and the amount of terrestrial rainfall fluctuated in a 400 million yr cycle over Phanerozoic time. These data are used to develop the hypothesis that the level of oceanic turbidity CO-varied with these changes and that turbidity was the motor, plate tectonics the tempo and perception the mode of evolution in Phanerozoic seas. This hypothesis predicts that during turbidity maxima (Silunan-Devonian, Jurassic-Tertiary), animals with non-visual foraging and predator-avoidance mechamsms and adaptations to marine pelagic. freshwater and terrestrial habits should diversify. During turbidity minima (late-precambrianCambrian, late-Carboniferous-Triassic), animals with vlsual sensory modalities and benthic habitat specializations should diversify. At the boundary of these envlronmental conhtions, alternating mass extinctions of these adaptive characters and the taxa possessing them should occur. Patterns in the evolution of perceptual modalities, foraging strategies, predator avoidance mechanisms, habitat specializations and inferred aspects of behavioral ecology of aquatic arthropods. 1.e. adaptive characters that are less sensitive to instantaneous changes in diversity than are the taxa that carried them, are used to test these predictions. Trilobite diversification and extinction, the adaptive radation of ostracods and eumalacostracan crustaceans; the iterative evolution of small, fast-moving entomostracan crustaceans; and the evolution of terrestrial chelicerates and decapod crustaceans are all consistent m t h these predictions. In short, the hlstory of aquatic evolution m Phanerozoic seas can be told in the evolution of perception. Data as disparate as the diversification and extinction of marine plants, cephalopod mollusks and fish are also consistent with predictions deduced from this hypothesis.

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“…Contributions from all dendrites are summed in the integrating fibre. [Calculations for a similar integrating process have been described in Iacino et al (1990); Di .] As long as the depolarization is above threshold, spikes (sp in Fig.…”

Section: An Integrating Fibrementioning

confidence: 99%

The magnetic and electric fields induced by superparamagnetic magnetite in honeybees

Schilf

Canal

1993

Biol. Cybern.

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Abstract.Hairs on the abdomen of honeybees contain dendrites and a rod and ring structure composed of black particles, presumed to be superparamagnetic (SPM) magnetite. The rod and ring were divided into compartments and each compartment approximated by a dipole. The magnetic fields were calculated at a point P at various locations for a change of the external geomagnetic field from zero to 0.5 G in 0.1 s. The magnetite amplifies the external field at the rod/ring-dendrite interface. The induced electric field and potential difference for a small circular area are in the order of 10 -7 V/m and 10 -~3 V respectively. Mechanisms are proposed for amplifying the electric fields in the dendrite and in an integrating nerve fibre. A hypothesis is developed for associative learning of visual and magnetic stimuli. If magnetic and visual inputs are associated in the ganglion and in the brain, very small changes of either magnetic or visual inputs could be perceived. A bee could sequentially follow the images associated with magnetic gradients on a cloudy day and find the food source.

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A neural model for localizing targets in space accomplished by the eye of a mantis shrimp

Cited by 13 publications

References 17 publications

An introductory survey of ecology and sensory receptors of tropical eastern pacific crustaceans

An introductory survey of ecology and sensory receptors of tropical eastern pacific crustaceans

Turbidity, arthropods and the evolution of perception:toward a new paradigm of marine phanerozoic diversity

The magnetic and electric fields induced by superparamagnetic magnetite in honeybees

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