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Archiv 2015

Veröffentlicht: 18.10.2015 Share it on Facebook


Schildkröten im Fokus, Bergheim 12 (4) 2015: 4–14

Eine neue Hypothese zur Nutzung der Geomagnetfeldorientierung von terrestrischen Schlüpflingen und die Frage: Zwingt diese zum Umdenken bei „Head-Start-Programmen“ für Sumpf- und Wasserschildkröten?

Text von Hans-Jürgen Bidmon, Düsseldorf

Fotos von Hans-Jürgen Bidmon, Düsseldorf, Scott D. Gillingwater, London, Ontario, Kanada, James H. Harding, East Lansing, Michigan, USA, Norbert Schneeweiß, Rhinluch, Andrew D. Walde, Victorville, Kalifornien, USA

A new hypothesis for the use of geomagnetic field orientation by terrestrial hatchlings and the question: Do these new insights about the geomagnetic field orientation by turtles require rethinking the practice of head-start programs for turtles and terrapins?

Text by Hans-Jürgen Bidmon, Düsseldorf, Germany

Photos by Hans-Jürgen Bidmon, Düsseldorf, Germany, Scott D. Gillingwater, London, Ontario, Canada, James H. Harding, East Lansing, Michigan, U.S.A., Norbert Schneeweiß, Rhinluch, Germany, Andrew D. Walde, Victorville, California, U.S.A.


Abstract

Here I discuss a new biological hypothesis of direct geo-electromagnetic field perception of early turtle embryos while the eggs are still in utero within the mother, in response to Liboff’s (2015) hypothesis of geomagnetic field information information-transfer via molecular signals from the mother into the developing turtle egg. The new hypothesis pays attention to certain specific constraints such as a completed egg shell during the late phases of migrating towards the nest as well as the need to change this information if the well-known nesting sites are destroyed and have to be changed shortly before deposition, because such late unpredictable nest site change can involve additional long distance migrations according to the literature. This new alternative hypothesis is based on the very new discovery of specialized geomagnetic perception neurons in the vinegar eel, Caenorhabditis elegans which are the first indications that these specialized neurons exist in animals. In general the overwhelming new insights about the use of the geomagnetic field orientation by turtles provide the evidence for a need to drastically rethink the practice of head-start programs for enhancing turtle and terrapin populations at least when their long term survival depends on long distance migrations to suitable nesting sites.

Key words

Chelonia, Testudines, Emydidae, Direct embryonic geomagnetic field perception hypothesis, geomagnetic field, geomagnetic maps, head-start programs, conservation biology

Englische Version

=> Englisch PDF


Author

Hans-Jürgen Bidmon, Düsseldorf, Germany
email: hjb@hirn.uni-duesseldorf.de

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© Michael Daubner 2017Schildkröten im Focus