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Ergatoid reproductives in the Neotropical termite Nasutitermes aquilinus (Holmgren) (Blattaria: Isoptera: Termitidae): developmental origin, fecundity, and genetics

Texto completo
Autor(es):
da Silva, Iago Bueno [1] ; Haifig, Ives [2] ; Vargo, Edward L. [3] ; Casarin, Fabiana Elaine [4] ; da Mota, Marcelo Luiz [5] ; Lima, Juliana Toledo [6] ; Costa-Leonardo, Ana Maria [1]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Estadual Paulista, Inst Biociencias, Dept Biol, Lab Cupins, UNESP, BR-13506900 Rio Claro, SP - Brazil
[2] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Sao Bernardo Do Campo, SP - Brazil
[3] Texas A&M Univ, Dept Entomol, College Stn, TX 77843 - USA
[4] Univ Fed Sao Paulo UNIFESP, Dept Ciencias Biol, Diadema, SP - Brazil
[5] UFU, Inst Ciencias Agr, Monte Carmelo, MG - Brazil
[6] Univ Estadual Mato Grosso do Sul, Ctr Estudos Recursos Nat, Dourados, De - Brazil
Número total de Afiliações: 6
Tipo de documento: Artigo Científico
Fonte: Insect Science; OCT 2019.
Citações Web of Science: 0
Resumo

Termite colonies are usually headed by primary reproductives, which establish nests during the swarming season. However, secondary reproductives may develop in some species and become supplementary or replacement breeders, extending colony lifespan. Here we investigate the developmental origin, fecundity and genetic characterization of ergatoid reproductives in the Neotropical termite Nasutitermes aquilinus (Holmgren), using morphometrical and histological techniques, five microsatellite loci and the COI mitochondrial DNA. Twelve measurements performed on 208 apterous individuals of N. aquilinus revealed 10 groups, including ergatoid females, which developed from major workers through two successive molts, and were characterized by the presence of imaginal features such as eyes and wing buds. The differentiation of these features was correlated to physogastric development in these ergatoids. Histology revealed oocytes in all maturation stages in worker-derived reproductives of N. aquilinus, presence of nonflagellate spermatozoa inside the spermatheca, and royal fat body. Thus, ergatoid reproductives were reproductively functional. According to the genotypes of 221 individuals from 11 nests, and mitochondrial haplotypes of 43 ergatoids, 73% of the colonies were simple families, whereas 27% were extended families. Despite the occurrence of related reproductives, low inbreeding rates were detected within and among colonies. Such values could be explained given that sib mating itself cannot result in a higher inbreeding rate but depend on several factors discussed in detail. This is the first study to investigate the genetic structure of termite colonies influenced by the development of ergatoids, and further investigations are encouraged to understand the influence of these reproductives on colony lifespan. (AU)

Processo FAPESP: 14/25857-4 - Mecanismos de reprodução em duas espécies de cupins neotropicais
Beneficiário:Ana Maria Costa-Leonardo
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 12/23898-0 - Manipulação da reprodução em cupins com ênfase nas estratégias via neotênicos
Beneficiário:Ives Haifig
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 17/04525-1 - Estratégias reprodutivas do cupim neotropical Nasutitermes aquilinus (Isoptera: Termitidae)
Beneficiário:Iago Bueno da Silva
Linha de fomento: Bolsas no Brasil - Mestrado