Sperm storage reduces the strength of the mate-finding Allee effect

Jiménez-Franco, M. V. ; Giménez, A. ; Rodríguez-Caro, R. C. ; Sanz-Aguilar, A. ; Botella, F. ; Anadón, J. D. (Universidad de Zaragoza) ; Wiegand, T. ; Graciá, E.

Resumen: Mate searching is a key component of sexual reproduction that can have important implications for population viability, especially for the mate-finding Allee effect. Interannual sperm storage by females may be an adaptation that potentially attenuates mate limitation, but the demographic consequences of this functional trait have not been studied. Our goal is to assess the effect of female sperm storage durability on the strength of the mate-finding Allee effect and the viability of populations subject to low population density and habitat alteration. We used an individual-based simulation model that incorporates realistic representations of the demographic and spatial processes of our model species, the spur-thighed tortoise (Testudo graeca). This allowed for a detailed assessment of reproductive rates, population growth rates, and extinction probabilities. We also studied the relationship between the number of reproductive males and the reproductive rates for scenarios combining different levels of sperm storage durability, initial population density, and landscape alteration. Our results showed that simulated populations parameterized with the field-observed demographic rates collapsed for short sperm storage durability, but were viable for a durability of one year or longer. In contrast, the simulated populations with a low initial density were only viable in human-altered landscapes for sperm storage durability of 4 years. We find that sperm storage is an effective mechanism that can reduce the strength of the mate-finding Allee effect and contribute to the persistence of low-density populations. Our study highlights the key role of sperm storage in the dynamics of species with limited movement ability to facilitate reproduction in patchy landscapes or during population expansion. This study represents the first quantification of the effect of sperm storage durability on population dynamics in different landscapes and population scenarios.

Idioma: Inglés

DOI: 10.1002/ece3.6019

Año: 2020

Publicado en: Ecology and Evolution 10 (2020), 1938–1948
ISSN: 2045-7758

Originalmente disponible en: Texto completo de la revista

Factor impacto JCR: 2.912 (2020)

Categ. JCR: EVOLUTIONARY BIOLOGY rank: 25 / 50 = 0.5 (2020) - Q2 - T2
Categ. JCR: ECOLOGY rank: 70 / 166 = 0.422 (2020) - Q2 - T2

Factor impacto SCIMAGO: 1.17 - Ecology (Q1) - Nature and Landscape Conservation (Q1) - Ecology, Evolution, Behavior and Systematics (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MICINN/RYC-2017-22783
Financiación: info:eu-repo/grantAgreement/ES/MICINN RYC-2017-22796
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/CGL2012-33536
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/CGL2015-64144

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Ecología (Dpto. CC.Agrar.y Medio Natural)