Female polyandry and size-assortative mating in isolated local populations of the Japanese common toad<i>Bufo japonicus</i>

Hase, Kazuko; Shimada, Muneaki

doi:10.1111/bij.12339

Cited by 14 publications

(6 citation statements)

References 24 publications

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“…Sztatecsny et al 2006) or from the presence of free swimming sperm from multiple males (e.g. Hase and Shimada 2014). However, we found relatively low PA, with some populations exhibiting little or no evidence of polyandry (Fig.…”

Section: Discussionmentioning

confidence: 59%

Do female amphibians and reptiles have greater reproductive output if they have more mates?

Lee

Sherman

Rollins

et al. 2022

Behav Ecol Sociobiol

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In general, males mate with multiple females to increase individual reproductive success. Whether or not, and under what circumstances, females benefit from multiple mating has been less clear. Our review of 154 studies covering 184 populations of amphibians and reptiles showed that polyandry was widespread and variable among and within taxonomic groups. We investigated whether amphibian and reptile females had greater reproductive output as the number of sires for offspring increased. Meta-analysis revealed significant heterogeneity in the dataset of all taxa. Expected heterozygosity was a significant moderator (covariate) of positive relationships between female reproductive output and the number of sires, but a sensitivity test showed the result was tenuous. Significant heterogeneity remained despite controlling for expected heterozygosity and other variables but was resolved for most taxonomic groups with subgroup meta-analyses. Subgroup meta-analyses showed that only female salamanders (Caudata) had significantly greater reproductive output with an increased number of sires. For many species of Caudata, males cannot coerce females into accepting spermatophores. We therefore suggest that if females control the number of matings, they can use polyandry to increase their fitness. Caudata offers ideal models with which to test this hypothesis and to explore factors enabling and maintaining the evolution of female choice. Outstanding problems may be addressed by expanding taxonomic coverage and data collection and improving data reporting. Significance Statement Many factors and combinations of factors drive polyandry. Whether or not females benefit from mating with more than one male remains equivocal. Focusing on amphibians and reptiles, our analyses demonstrate that female salamanders produced more offspring when mated with multiple males, whereas this was not the case for reptiles. Unlike many other species in our dataset, the polyandrous female salamanders fully control sperm intake and have chosen to mate multiple times. We further highlight problems and key directions for future research in the field.

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Section: Discussionmentioning

confidence: 59%

Do female amphibians and reptiles have greater reproductive output if they have more mates?

Lee

Sherman

Rollins

et al. 2022

Behav Ecol Sociobiol

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“…In the case of mate choice in the toads, in particular miyakonis , species recognition seems not to be significant due to geographically isolation. In addition, male-male competition is a central factor rather than female preference in the reproductive behavior of B. japonicus (Hase & Shimada 2014). An exploration of the ecological function of the species recognition abilities we detected lies beyond the scope of this study.…”

Section: Discussionmentioning

confidence: 99%

Genetic distance and social compatibility in the aggregation behavior of Japanese toad tadpoles

Hase

Abe

Shimada

2018

Preprint

Self Cite

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From microorganism to vertebrates, living things often exhibit social aggregation. One of anuran larvae, dark-bodied toad tadpoles (genus Bufo) are known to aggregate against predators. When individuals share genes from a common ancestor for whom social aggregation was a functional trait, they are also likely to share common recognition cues regarding association preferences, while greater genetic distances make cohesive aggregation difficult. In this study, we conducted quantitative analyses to examine aggregation behavior among three lineages of toad tadpoles: Bufo japonicus japonicus, B. japonicus formosus, and B. gargarizans miyakonis. To determine whether there is a correlation between cohesiveness and genetic similarity among group members, we conducted an aggregation test using 42 cohorts consisting of combinations drawn from a laboratory-reared set belonging to distinct clutches. As genetic indices, we used mitochondrial DNA (mtDNA) and major histocompatibility complex (MHC) class II alleles. The results clearly indicated that aggregation behavior in toad tadpoles is directly influenced by genetic distances based on mtDNA sequences and not on MHC haplotypes. Cohesiveness among heterogeneous tadpoles is negatively correlated with the geographic dispersal of groups. Our findings suggest that social incompatibility among toad tadpoles reflects phylogenetic relationships.

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“…Most empirical studies have found a large male advantage (Chajma & Vojar, 2016;Rausch et al, 2014). Alternatively, a size-assortative (Cogălniceanu et al, 2013;Hase & Shimada, 2014;Lu et al, 2009) or random mating pattern with respect to size of mating partners has also been described (Elmberg, 1987;Sullivan, 1989).…”

Section: Explosive Breeding and Non-assortative Matingmentioning

confidence: 99%

“…On the other hand, an optimal ratio between the size of partners forming an amplexus can determine an increase in the percentage of fertilised eggs through a favourable juxtaposition of partners as well as resistance to displacement from competing males, so that it is advantageous for smaller individuals to choose smaller partners, resulting in a size selection of mates that are not necessarily the larger ones (Bastos & Haddad, ; Pfennig, ). As a result of the mentioned selective pressures, assortative mating based on body size is in many cases favoured (Chajma & Vojar, ; Hase & Shimada, ).…”

Section: Introductionmentioning

confidence: 99%

Random size‐assortative mating despite size‐dependent fecundity in a Neotropical amphibian with explosive reproduction

Székely

Denoël

et al. 2018

Ethology

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Sexual selection theory predicts that, when body size is correlated with fecundity, there should be fitness advantages for mate choice of the largest females. Moreover, because larger males are expected to monopolise the largest females, this should result in an assortative mating based on body size. Although such patterns could be expected in both explosive and prolonged breeders, non‐assortative mating should be more widespread in species under time constraints. However, patterns of sexual selection are largely unexplored in explosive breeding species, and contrasting patterns have been found previously. We expect that the active choice of partners may be particularly risky when the time period during which sexual partners are available is severely limited. Therefore, to avoid missing an entire reproductive act, males and females should pair irrespective of traits, such as body size. We tested this hypothesis by investigating the mating patterns of the Pacific horned toad, Ceratophrys stolzmanni, a short‐lived fossorial species inhabiting Neotropical dry forests. This species is particularly adequate to test our prediction because it reproduces explosively over the course of a single night per year. Although the number of eggs laid was proportional to the size of females, and individuals of both sexes showed variation in body size, there was no assortative mating based either on size, body condition or age of mates. Egg size was not influenced by either female size or clutch size. The larger body size of females compared to males is likely due to fecundity selection, that is, the selective pressure that enhances reproductive output. Although we cannot dismiss the possibility that individuals could select their partners based on other criteria than those related to size or age, the results fit well our prediction, showing that the explosive breeding makes improbable an active choice of partners in both sexes and therefore favours a random mating pattern.

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Female polyandry and size-assortative mating in isolated local populations of the Japanese common toadBufo japonicus

Cited by 14 publications

References 24 publications

Do female amphibians and reptiles have greater reproductive output if they have more mates?

Do female amphibians and reptiles have greater reproductive output if they have more mates?

Genetic distance and social compatibility in the aggregation behavior of Japanese toad tadpoles

Random size‐assortative mating despite size‐dependent fecundity in a Neotropical amphibian with explosive reproduction

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