Is there host-associated differentiation in marine herbivorous amphipods?

Autor(es)

Peres, Pedro A. ^{[1, 2]} ; Azevedo-Silva, Marianne ^[1] ; Andrade, Sonia C. S. ^[3] ; Leite, Fosca P. P. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Campinas UNICAMP, Inst Biol, Dept Anim Biol, Campinas, SP - Brazil

^[2] Univ Sao Paulo, Fac Philosophy Sci & Letters Ribeirao Preto FFCLR, Dept Biol, Ave Bandeirantes 3900, BR-14040901 Ribeirao Preto - Brazil

^[3] Univ Sao Paulo, Inst Biosci, Dept Genet & Evolutionary Biol, Ribeirao Preto - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Biological Journal of the Linnean Society; v. 126, n. 4, p. 885-898, APR 2019.
• Citações Web of Science: 0

Resumo

Plant-herbivore interactions play an important role in the evolution of small terrestrial and marine herbivores. Some authors consider marine herbivorous amphipods to be ecologically equivalent to terrestrial insects, in that both are small relative to larger host plants, and host choices are often chemically mediated. Different host species provide distinct selective pressures for their associated animal populations, which may act as divergent selection pressure towards adaptive traits related to each host. This phenomenon, termed host-associated differentiation (HAD), has been documented in insects, and can lead to local adaptation, or even ecological speciation. However, whether HAD occurs within marine amphipod species remains unexplored. Here, Cymadusa filosa (Amphipoda, Ampithoidae) and its host macroalgae were used as models to test whether amphipods from different host macroalgae are genetically or morphologically differentiated. Furthermore, we tested for differentiation among geographically separated populations resulting from dispersal limitation. Ten microsatellite loci were used to assess genetic diversity, along with geometric morphometric analyses for morphology. The results indicate that there was no HAD with regard to genetic and morphological features. Individuals seem to be highly mobile on local scales or to disperse as juveniles, and they seem capable of dispering among sites. Two distinct morphological groups were formed, probably related to the environmental conditions at those sites. HAD in marine environments is probably context-dependent, and should be explored for different species and scales to better appraise marine plant-herbivore interactions. (AU)

• Processo FAPESP: 14/23141-1 - Ecologia de interações, ecologia comportamental e biologia molecular de formigas neotropicais
• Beneficiário: Paulo Sergio Moreira Carvalho de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular
• Processo FAPESP: 14/15614-7 - Interação entre anfípodes herbívoros e algas: a identidade da alga hospedeira influência a estrutura genética de populações de herbívoros?
• Beneficiário: Pedro Augusto da Silva Peres
• Modalidade de apoio: Bolsas no Brasil - Mestrado