Orientation Based on Directivity, a Directional Parameter of the Animal’s Radiant Environment

Verheijen, F.J.

doi:10.1007/978-3-662-11147-5_45

Cited by 15 publications

(16 citation statements)

References 18 publications

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“…Fog or cloud reduce or entirely eliminate polarization originating in the upper atmosphere (Waterman,198 1). The result supports the view of Verheijen (1978) that animals may use light radiance as a directional cue, and it may mean that sunlight provides a stronger directional reference than the geomagnetic field. Consequently, it seems more likely that the ' time lag ' in response to changes in the geomagnetic field (Taylor, 1986~) was caused by contradictory information gained from the ambient artificial light distribution outside the test arena.…”

Section: Sun/artificial Light Orientationsupporting

confidence: 82%

Experimental evidence for juvenile Chinook salmon, Oncorhynchus tschawytscha Walbaum, orientation at night and in sunlight after a 7° change in latitude

Taylor

1987

Journal of Fish Biology

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A group of eighteen young chinook salmon, Oncorhynchus rschawyfscha Walbaum, trained to orientate in the direction 270", showed a unimodal orientation of 264" and a mean bimodal axis of orientation of 258"/078" (magnetic) within confidence limits of 218"+ +285": 038"-+105" when tested under controlled conditions in Auckland. Two years later 12 of these fish were transferred to a new test arena in Christchurch, south (7" latitude) of the original location, for individual re-testing at night in a light-proof room and also in sunlight; in the absence of ' local ' Auckland cues/clues. These fish had been kept in artificial light but six fish were exposed to sunlight in Auckland 2 weeks before moving to Christchurch.At night each fish showed consistent non-random orientation and nine out of 10 fish showed a mean bimodal orientation that fell within the confidence limit established in Auckland; the mean of means axis of orientation for 10 fish was 270"/090". In sunlight each individual fish showed a consistent, non-random mean bimodal orientation that fell outside the confidence limits established in Auckland and, at night, in Christchurch. The mean of means axis of orientation was 001c/1810 (magnetic); the map direction from Christchurch to Auckland is IS". The principal findings in this study were: (a) ' Local ' Auckland cues were not essential for location of the learnt direction. (b) A non-visual ' universal 'cue was used asa reference for location ofdirection at night. (c) Daylight orientation was influenced by anisotropic radiance, even though the sun image was obscured by the test arena cover. (d) The concentration of data at midday and sunset in artificial light and perhaps at midnight, may indicate the presence of a non-visual zeitgeber. (e) A correlation between time and direction, in light and in darkness, which by implication involves a co-ordination process. (f) The fish under test apparently imprinted on some aspect ofthe sun (in Auckland) within a 2-day period at the age of 2 years. (9) Displacement, by 7" in latitude, may have been detected by both visual and non-visual means.It is proposed that directional information from the geomagnetic field and the anisotropic radiance of sunlight provides a complementary cross reference which would be. sufficient for positional orientation, in relation to some fixed landmark, within coastal waters; but would not suffice for spatial orientation in mid-ocean.

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Section: Sun/artificial Light Orientationsupporting

confidence: 82%

Experimental evidence for juvenile Chinook salmon, Oncorhynchus tschawytscha Walbaum, orientation at night and in sunlight after a 7° change in latitude

Taylor

1987

Journal of Fish Biology

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“…9): the animals employ a smaller angle of orientation than is theoretically expected, deviating towards the sun. This phenomenon was attributed by Verheijen (1978) to a «trapping effect» dependent on a high directionality of the radiance angular distribution. The decline in capacity to orient correctly due to prolonged captivity shows itself in a diminishing photomenotactic response and increasing direct positive phototaxis (Ercolini, 1963b).…”

Section: Talitrusmentioning

confidence: 97%

Zonal recovery mechanisms in talitrid crustaceans

Pardi

Ercolini

1986

Bolletino di zoologia

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“…This difference is probably due to the highly directional angular light distribution (ALD) used in our experiments (Verheijen 1958(Verheijen , 1978. Forward (1986) found differences in the phototactic responses of crab larvae to a narrow light beam as compared to a simulated natural ALD.…”

Section: Phototaxis In Daphnia: Interaction Of Hunger and Genotypementioning

confidence: 99%

Phototaxis in Daphnia: Interaction of hunger and genotype

Meester

Dumont

1989

Limnology & Oceanography

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Orientation Based on Directivity, a Directional Parameter of the Animal’s Radiant Environment

Cited by 15 publications

References 18 publications

Experimental evidence for juvenile Chinook salmon, Oncorhynchus tschawytscha Walbaum, orientation at night and in sunlight after a 7° change in latitude

Experimental evidence for juvenile Chinook salmon, Oncorhynchus tschawytscha Walbaum, orientation at night and in sunlight after a 7° change in latitude

Zonal recovery mechanisms in talitrid crustaceans

Phototaxis in Daphnia: Interaction of hunger and genotype

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