Ein Weg ohne Rückkehr?

Die Lebendgeburt (Viviparie) evolvierte mehrfach unabhängig voneinander innerhalb der Wirbeltiere, besonders oft bei den Eidechsen und Schlangen. Dafür wurden verschiedene physiologische und anatomische Veränderungen entwickelt wie die Plazenta bei rein viviparen Arten. Fossile Meeresreptilien belegen, dass das marine Leben die Evolution der Viviparie begünstigt. Voraussetzung dafür ist die Entwicklung einer genetisch determinierten Geschlechtsbestimmung. Die Rückkehr von der Viviparie zur Eiablage (Oviparie) ist physiologisch und anatomisch sehr schwierig. Ob sie überhaupt möglich ist, ist noch nicht geklärt.

• Publication year

  2019

• Venue

  Biologie in unserer Zeit

• Publication date

  2019-06-01

• Fields of study

  Not labeled

• Identifiers
  DOI 10.1002/biuz.201910676
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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