Magnetic compass and learning of theY,axis (sea-land) direction in the marine isopodIdotea baltica basteri

Ugolini, Alberto; Pezzani, A.

doi:10.1006/anbe.1995.0245

Cited by 22 publications

(28 citation statements)

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“…Because we were limited by the climatic conditions of the short Antarctic summer and the continuous sea ice cover of the littoral areas, we could not collect animals from sites with a differently oriented y-axis. Nevertheless, the magnetic orientation of littoral amphipods along the y-axes from variously oriented beaches has already been reported by Rothsey (2006) and Ugolini and Pezzani (1995), and testing the y-axis phenomenon was not our primary goal.…”

Section: Resultsmentioning

confidence: 98%

“…This direction was hypothesised according to data from the literature (Ugolini and Pezzani, 1995;Rothsey, 2006) as a crucial orientation bearing helping marine crustaceans to avoid becoming stranded in basins of shallow water during the draining phase. Under the natural MFE, the animals displayed significant spontaneous orientation with magnetic azimuth µ=47 deg (n=81, r=0.239, P=0.010; Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Correct orientation in the sea-land axis ( y-axis) has been reported as being crucial for small animals living in the littoral zone. Supratidal crustaceans dwelling in the seagrass wrack accumulated on beaches above the water line prefer to escape in the shoreward direction (Rothsey, 2006;terHorst, 2012;Ugolini and Pezzani, 1995), but this motivation may be reversed by environmental factors; for example, beach hoppers (Orchestia sp.) move towards the shore in wet environments and towards the water in dry environments (terHorst, 2012;Rothsey, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…The sea-land axis ( y-axis; discussed below) plays the key role in orientation in rapidly changing flood and drain streams. The MFE provides a number of marine and freshwater animals living on the edge of land and water, such as crustaceans [Ugolini and Ciofini, 2016;terHorst, 2012;Ugolini and Pezzani, 1995; S. C. Rothsey, The effect of the earth's magnetic field and other orientation cues on direction seeking in four crustaceans (three intertidal -Amphipoda and Isopoda, one freshwater -Decapoda), University of New England, 2006], frog tadpoles (Diego-Rasilla et al, 2013) and newts (Deutschlander et al, 2000), with a stable orientation cue helping them to find and keep a shoreward or waterward y-axis bearing.…”

Section: Introductionmentioning

confidence: 99%

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The magnetic orientation of the Antarctic amphipod Gondogeneia antarctica is cancelled by very weak radiofrequency fields

Tomanová

Vácha

2016

Journal of Experimental Biology

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Studies on weak man-made radiofrequency (RF) electromagnetic fields affecting animal magnetoreception aim for a better understanding of the reception mechanism and also point to a new phenomenon having possible consequences in ecology and environmental protection. RF impacts on magnetic compasses have recently been demonstrated in migratory birds and other vertebrates. We set out to investigate the effect of RF on the magnetic orientation of the Antarctic krill species Gondogeneia antarctica, a small marine crustacean widespread along the Antarctic littoral line. Here, we show that upon release, G. antarctica (held under laboratory conditions) escaped in the magnetically seaward direction along the magnetic sea-land axis ( y-axis) of the home beach. However, the animals were disoriented after being exposed to RF. Orientation was lost not only in an RF field with a magnetic flux density of 20 nT, as expected according to the literature, but even under the 2 nT originally intended as a control. Our results extend recent findings of the extraordinary sensitivity of animal magnetoreception to weak RF fields in marine invertebrates.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The magnetic orientation of the Antarctic amphipod Gondogeneia antarctica is cancelled by very weak radiofrequency fields

Tomanová

Vácha

2016

Journal of Experimental Biology

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“…Thus, it is unlikely that the seals used the celestial cues for navigation in the early phase of homing. Another potential cue is the geomagnetic field, which is thought to be used by many marine animals as well as land animals (Quinn, 1980;Quinn et al, 1981;Lohmann and Lohmann, 1994;Lohmann et al, 1995;Ugolini and Pezzani, 1995;Lohmann and Lohmann, 1996;Lohmann et al, 2004). Geomagnetic and acoustic cues are particularly appealing as navigation cues because they are available underwater.…”

Section: Discussionmentioning

confidence: 99%

Underwater and surface behavior of homing juvenile northern elephant seals

Matsumura

Watanabe

Robinson

et al. 2011

Journal of Experimental Biology

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SUMMARYNorthern elephant seals, Mirounga angustirostris, travel between colonies along the west coast of North America and foraging areas in the North Pacific. They also have the ability to return to their home colony after being experimentally translocated. However, the mechanisms of this navigation are not known. Visual information could serve an important role in navigation, either primary or supplementary. We examined the role of visual cues in elephant seal navigation by translocating three seals and recording their heading direction continuously using GPS, and acceleration and geomagnetic data loggers while they returned to the colony. The seals first reached the coast and then proceeded to the colony by swimming along the coast. While underwater the animals exhibited a horizontally straight course (mean net-to-gross displacement ratio0.94±0.02). In contrast, while at the surface they changed their headings up to 360deg. These results are consistent with the use of visual cues for navigation to the colony. The seals may visually orient by using landmarks as they swim along the coast. We further assessed whether the seals could maintain a consistent heading while underwater during drift dives where one might expect that passive spiraling during drift dives could cause disorientation. However, seals were able to maintain the initial course heading even while underwater during drift dives where there was spiral motion (to within 20deg). This behavior may imply the use of non-visual cues such as acoustic signals or magnetic fields for underwater orientation.

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Tactic components in orientation

Campan

1997

Orientation and Communication in Arthropods

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Magnetic compass and learning of theY,axis (sea-land) direction in the marine isopodIdotea baltica basteri

Cited by 22 publications

References 0 publications

The magnetic orientation of the Antarctic amphipod Gondogeneia antarctica is cancelled by very weak radiofrequency fields

The magnetic orientation of the Antarctic amphipod Gondogeneia antarctica is cancelled by very weak radiofrequency fields

Underwater and surface behavior of homing juvenile northern elephant seals

Tactic components in orientation

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