The more the better - polyandry and genetic similarity are positively linked to reproductive success in a natural population of terrestrial salamanders (Salamandra salamandra)

Autor: Oliver Rupp, Michael Kopp, Barbara A. Caspers, Sebastian Steinfartz, Ralf Hendrix, Katrin Rosentreter, E. Tobias Krause
Přispěvatelé: Institut de Mathématiques de Marseille (I2M), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)
Jazyk: angličtina
Rok vydání: 2014
Předmět:
0106 biological sciences
Male
Zoology
MESH: Reproduction
010603 evolutionary biology
01 natural sciences
MESH: Salamandra
03 medical and health sciences
Sexual Behavior
Animal
Spermatheca
MESH: Genetic Fitness
Fire salamander
Germany
Genetics
Animals
MESH: Animals
Salamandra
Mating
MESH: Sexual Behavior
Animal
Sperm competition
MESH: Germany
Ecology
Evolution
Behavior and Systematics
reproductive and urinary physiology
030304 developmental biology
0303 health sciences
biology
Reproductive success
Ecology
Reproduction
[SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE]
MESH: Spermatozoa
biology.organism_classification
Sperm
Spermatozoa
MESH: Male
Mate choice
Fertilization
Larva
Female
MESH: Fertilization
Genetic Fitness
MESH: Microsatellite Repeats
MESH: Female
MESH: Larva
Microsatellite Repeats
Zdroj: Molecular Ecology
Molecular Ecology, Wiley, 2014, 23 (1), pp.239-50. ⟨10.1111/mec.12577⟩
Molecular Ecology, 2014, 23 (1), pp.239-50. ⟨10.1111/mec.12577⟩
ISSN: 0962-1083
1365-294X
Popis: International audience; Although classically thought to be rare, female polyandry is widespread and may entail significant fitness benefits. If females store sperm over extended periods of time, the consequences of polyandry will depend on the pattern of sperm storage, and some of the potential benefits of polyandry can only be realized if sperm from different males is mixed. Our study aimed to determine patterns and consequences of polyandry in an amphibian species, the fire salamander, under fully natural conditions. Fire salamanders are ideal study objects, because mating, fertilization and larval deposition are temporally decoupled, females store sperm for several months, and larvae are deposited in the order of fertilization. Based on 18 microsatellite loci, we conducted paternity analysis of 24 female-offspring arrays with, in total, over 600 larvae fertilized under complete natural conditions. More than one-third of females were polyandrous and up to four males were found as sires. Our data clearly show that sperm from multiple males is mixed in the female's spermatheca. Nevertheless, paternity is biased, and the most successful male sires on average 70% of the larvae, suggesting a 'topping off' mechanism with first-male precedence. Female reproductive success increased with the number of sires, most probably because multiple mating ensured high fertilization success. In contrast, offspring number was unaffected by female condition and genetic characteristics, but surprisingly, it increased with the degree of genetic relatedness between females and their sires. Sires of polyandrous females tended to be genetically similar to each other, indicating a role for active female choice.
Databáze: OpenAIRE
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