Reproductive cycle and sperm storage of female coral snakes, Micrurus corallinus and Micrurus frontalis

Autor(es)

Bassi, Erick Augusto ^{[1, 2]} ; Coeti, Rafaela Zani ^{[1, 3]} ; de Almeida-Santos, Selma Maria ^{[1, 2, 3]}

Afiliação do(s) autor(es)

^[1] Inst Butantan, Lab Ecol & Evolucao, Ave Vital Brasil 1500, BR-05503900 Sao Paulo - Brazil

^[2] Univ Estadual Paulista UNESP, Inst Biociencias Letras & Ciencias Exatas IBILCE, Dept Biol, Campus Sao Jose do Rio Preto 2265, BR-15054000 Sao Paulo, SP - Brazil

^[3] Univ Sao Paulo, Fac Med Vet & Zootecn, Dept Cirurgia, Av Orlando Marques de Paiva, Cidade Univ, BR-87055080 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Amphibia-Reptilia; v. 41, n. 1, p. 13-27, JAN 2020.
• Citações Web of Science: 0

Resumo

We analyzed the hypothesis that the lack of synchronization between the mating and ovulation period of Micrurus frontalis (BRT clade) is indicative of the capacity of females to store sperm. Conversely, since these reproductive events occur in the same season for Micrurus corallinus (BRM clade), sperm storage is not expected. Thus, we analyzed the reproductive cycle of female M. corallinus and M. frontalis, and investigated the occurrence of sperm storage. Our results showed that these two species of coral snakes (clades BRM and BRT) possess different reproductive cycles. Micrurus frontalis exhibits an extensive reproductive period encompassing three seasons (summer, autumn and winter), while M. corallinus directs secondary vitellogenesis and ovulation to the hottest period of the year (spring and summer). We confirm, for the first time, the strategy of sperm storage (SSr) in females of the genus Micrurus. We observed sperm storage receptacles located in the non-glandular uterus in all seasons of the year for M. corallinus and in spring, summer and autumn in M. frontalis. Furthermore, the presence of SSr in females in the non-reproductive (post-ovulatory) period, the verification of myoid cells around the receptacles and secretion of neutral carbohydrates in the lumina of SSrs may indicates a long-term storage. The posterior infundibulum is another possible region of sperm storage by the presence of tubular ciliated gland; however, reproductive studies with other species of the genus are necessary for a better understanding of the reproductive strategies of the BRT and BRM clades. (AU)

• Processo FAPESP: 14/12813-9 - A influência de variações climáticas no ciclo reprodutivo de corais verdadeiras Micrurus corallinus e Micrurus frontalis
• Beneficiário: Erick Augusto Bassi
• Modalidade de apoio: Bolsas no Brasil - Mestrado