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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Cephalopod mating systems as models for the study of sexual selection and alternative reproductive tactics: a review

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Autor(es):
Apostolico, Ligia Haselmann [1] ; Amoroso Rodriguez Marian, Jose Eduardo [1]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Biosci, Dept Zool, Rua Matao, Travessa 14, Sao Paulo 05508090, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: BULLETIN OF MARINE SCIENCE; v. 96, n. 2, SI, p. 375-398, APR 2020.
Citações Web of Science: 1
Resumo

Cephalopods are a remarkable group for studies on sexual selection, due to their complex reproductive behavior, pronounced sexual dimorphism, polygamous behavior, as well as cumulative evidence of pre- and postcopulatory male-male competition and female choice in the group. This paper provides a review of sexual selection studies on cephalopods, with an emphasis on the loliginid squid mating system. In this system, males may adopt alternative reproductive tactics (ART) and display male intrasexual dimorphism, with each morph generally exhibiting distinct behaviors and ejaculate traits. Consort males typically transfer ejaculates to the female mantle cavity, while sneaker males typically transfer ejaculates to the female buccal region, where a sperm storage organ is located. Each site provides distinct fertilization environments for the ejaculates of each morph, differing in the availability of eggs, gamete protection, and timing between mating and fertilization. Accordingly, the ejaculates of each morph show putative adaptations for each site, differing in size, morphology, sperm release duration, and sperm behavior. Although solid evidence is lacking for most loliginids, cryptic female choice may occur in this system through, for example, spermatangia removal or egg string manipulation during fertilization. In addition, recent evidence for one loliginid species indicates that adoption of male ART is ontogenetic and may represent two alternative pathways: from immature males (i) directly to consort phenotype or (ii) going through a sneaker phase, then switching to consort morph. The second pathway would, therefore, imply striking change in behavior, physiology, and ejaculates. Moreover, data on the age of this species suggests that the adoption of sneaker tactic early in life may be associated with extending the male mating period by 25%. With such a peculiar system, loliginids should prove useful not only for comprehending the evolution of female promiscuity and ART in cephalopods, but also as an emerging nonvertebrate and nonarthropod model for testing sperm competition models. (AU)

Processo FAPESP: 13/02653-1 - Evolução dos mecanismos de transferência de espermatozóides em Cephalopoda: convergências adaptativas associadas a transições de habitats marinhos?
Beneficiário:José Eduardo Amoroso Rodriguez Marian
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 18/19180-2 - Cephalopod International Advisory Council Conference
Beneficiário:José Eduardo Amoroso Rodriguez Marian
Linha de fomento: Auxílio à Pesquisa - Reunião - Exterior
Processo FAPESP: 15/15447-6 - Decifrando mecanismos pós-copulatórios de seleção sexual em cefalópodes: Morfologia do receptáculo seminal de lulas aplicando técnicas de Microscopia Confocal e Reconstrução 3D
Beneficiário:Luiza de Oliveira Saad
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Mestrado
Processo FAPESP: 14/11008-5 - Função e evolução do receptáculo seminal em Decapodiformes (Mollusca: Cephalopoda): decifrando mecanismos pós-copulatórios de seleção sexual em cefalópodes
Beneficiário:Luiza de Oliveira Saad
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 17/16182-1 - Seleção sexual pós-copulatória em uma espécie de lula (Mollusca: Cephalopoda) com dimorfismo intrassexual masculino e dois sítios de fertilização
Beneficiário:Lígia Haselmann Apostólico
Linha de fomento: Bolsas no Brasil - Doutorado