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Traits and depth: What do hydroids tell us about morphology and life-history strategies in the deep sea?

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Fernandez, Marina Oliveira [1] ; Collins, Allen G. [2] ; Gittenberger, Arjan [3, 4, 5] ; Roy, Kaustuv [6] ; Marques, Antonio Carlos [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Biociencias, Dept Zool, R Matao, Trav 14, 101, BR-05508090 Sao Paulo, SP - Brazil
[2] NOAA, Natl Systemat Lab, Natl Marine Fisheries Serv, Smithsonian Natl Museum Nat Hist, Washington, DC - USA
[3] Leiden Univ, Inst Biol, Leiden - Netherlands
[4] Naturalis Biodivers Ctr, Leiden - Netherlands
[5] GiMaRIS, Sassenheim - Netherlands
[6] Univ Calif San Diego, Sect Ecol Behav & Evolut, La Jolla, CA 92093 - USA
Número total de Afiliações: 6
Tipo de documento: Artigo Científico
Citações Web of Science: 1

Aim Traits affect the survival and reproduction of individuals in different habitat conditions, ultimately altering their distributions. In the oceans, changes in environmental conditions with bathymetry may influence the occurrence of specific traits. Therefore, characterizing trait variation with depth can illuminate drivers related to the distribution of diversity of forms, functions, and life histories. We aimed to investigate patterns of variation in the diversified life histories and morphologies of hydroids with depth, integrating these patterns with the natural history of the group and ecological principles of the deep sea. Location Atlantic Ocean and adjacent polar seas, from 50 to 5,330 m deep. Time period Present day. Major taxa studied Hydrozoa. Methods Analyses were based on 14 traits collected for a total of 4,668 specimens of hydroids, belonging to 438 species. Records were divided into 12 depth strata for comparisons. We evaluated: how each trait varies with depth; whether variation in some traits is affected by the presence of other traits; how traits covary; and similarities in trait compositions among depth strata. Results Traits of hydroids vary with depth, with more pronounced differences for regions deeper than 1,000 m. Hydroids are generally smaller, infertile, solitary, meroplanktonic, and devoid of protective structures with increasing depth. The relationship, however, is not always linear. Also, some covariation and correlation between traits was evident. For example, depth may affect size differently according to the presence of specific traits such as structures protecting against predation. The lower proportion of fertile specimens recorded in the deep sea suggests that chances for genetic recombination are reduced in deep-sea populations, ultimately leading to a slower rate of evolution. Main conclusions We identified novel trends in hydroid trait variation with depth by combining observations on morphology, ecology, and life history, clarifying selection pressures on hydroids in the deep sea. (AU)

Processo FAPESP: 11/50242-5 - Dimensões da vida marinha: padrões e processos de diversificação em cnidários planctônicos e bentônicos
Beneficiário:Antonio Carlos Marques
Linha de fomento: Auxílio à Pesquisa - Programa BIOTA - Temático
Processo FAPESP: 13/10821-1 - Padrões de distribuição de hidrozoários (Cnidaria) em águas profundas do Oceano Atlântico e marés polares adjacentes
Beneficiário:Marina de Oliveira Fernandez
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 18/04257-0 - Macroecologia de mar profundo: integrando taxonomia, filogenia e função em inferências de padrões de distribuição de hidroides (Cnidaria) do Atlântico
Beneficiário:Marina de Oliveira Fernandez
Linha de fomento: Bolsas no Brasil - Pós-Doutorado