Tagesrhythmische und langfristige faunenverschiebungen im marinen supralitoral

Rüppel, Georg

doi:10.1007/bf00424638

Cited by 19 publications

(2 citation statements)

References 6 publications

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“…When these do occur the urgency for zonal recovery is at its greatest, just because it is daytime. Juveniles are also active during the day (Rüppel, 1967b).…”

Section: Innate and Learned Components In Zonal Orientationmentioning

confidence: 99%

Zonal recovery mechanisms in talitrid crustaceans

Pardi

Ercolini

1986

Bolletino di zoologia

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“…When these do occur the urgency for zonal recovery is at its greatest, just because it is daytime. Juveniles are also active during the day (Rüppel, 1967b).…”

Section: Innate and Learned Components In Zonal Orientationmentioning

confidence: 99%

Zonal recovery mechanisms in talitrid crustaceans

Pardi

Ercolini

1986

Bolletino di zoologia

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“…2000). Similarly, small juvenile shore talitrids are active under bright conditions but become increasingly dark-active as they age and grow (Riippell, 1967). Even in the terrestrial isopod Scyplui.\ tinnitus, it is the adults that make lengthy foraging excursions at night (Quilter and Lewis.…”

Section: Discussionmentioning

confidence: 99%

Postembryonic Eye Growth in the Seashore IsopodLigia exotica(Crustacea, Isopoda)

Keskinen

Takaku²,

Meyer‐Rochow³

et al. 2002

The Biological Bulletin

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The eye of Ligia exotica is of the apposition type and has open rhabdoms. The facets are hexagonal, and the dioptric apparatus consists of a flat cornea and a spherical crystalline cone placed in the center of two large cone cells. Each ommatidium has seven regular retinula cells and one eccentric cell; a basement membrane forms the proximal boundary of the retina. With increases in body size from 0.6 to almost 4.0 cm, facet numbers and ommatidial diameters increased from 800 to 1500 and 35 microm to 100 microm, respectively; eye length and width grew from 1.2 to 3.2 and 0.9 to 2.5 mm, respectively; and length of dioptric apparatus and width of retinal layer changed from 70 microm to 180 microm and about 70 microm to 120 microm. Visual angles and interommatidial angles of centrally located ommatidia remained constant at about 30 and 6.9 degrees, respectively. An almost perfect linear relationship was found when eye length was plotted against the product between the square root of the total number of ommatidia and the ommatidial diameter. No difference between males and females was observed in any of the relationships, but the results suggest that, compared with smaller specimens, larger ones possess increased absolute sensitivity in single ommatidia, increased sensitivity to point sources, and overall larger angular visual fields for the eye in its totality. This means that larger individuals of L. exotica (which are also faster) have an advantage over smaller individuals at night, but that smaller individuals may cope better with bright lights. Vision in L. exotica seems useful not only in detecting potential danger, but also in locating and approaching cliffs from a distance of 2-4 m when swimming in seawater.

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