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The evolution of parental care in salamanders
Balázs Vági1, Daniel Marsh2,3, Gergely Katona2
1ELKH-DE Reproductive Strategies Research Group, Department of Evolutionary Zoology and Human Biology, University of Debrecen, 4032, Debrecen, Hungary. bi.vagi@gmail.com.
Scientific Reports
|October 5, 2022
Summary
Parental care in salamanders is linked to fertilization mode, with internal fertilization enabling terrestrial reproduction. This suggests complex parenting behaviors were crucial for vertebrate evolution and diversification.
Area of Science:
- Evolutionary biology
- Herpetology
- Reproductive strategies
Background:
- Complex parenting is hypothesized to drive vertebrate evolutionary success.
- The evolutionary pathways and impact of parenting on vertebrate diversity remain debated.
- Basal vertebrates offer insights into complex reproduction but are understudied.
Purpose of the Study:
- To investigate the relationship between fertilization mode and parental care in salamanders (Caudata).
- To explore the role of these reproductive strategies in the evolution of terrestrial vertebrates.
Main Methods:
- Analysis of reproductive data from 181 salamander species across major lineages.
- Comparative analysis of fertilization modes (internal vs. external) and parental care patterns (male-only vs. female-only).
Main Results:
- A strong correlation was found between fertilization mode and parental care: male-only care in external fertilizers, and female-only care in internal fertilizers.
- Internal fertilization facilitates terrestrial egg deposition.
- Maternal care supports potential egg development outside aquatic environments.
Conclusions:
- Fertilization mode and parental care are intricately linked in early vertebrates like salamanders.
- The evolution of internal fertilization and subsequent maternal care in semi-aquatic vertebrates paved the way for terrestrial vertebrate radiation.
- Complex social behaviors, specifically parenting, are fundamental to vertebrate diversity and terrestrial adaptation.
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