caa a22 4500 606193227 CHVBK 20210128100908.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s10682-014-9717-8 doi (NATIONALLICENCE)springer-10.1007/s10682-014-9717-8 Environmentally determined juvenile growth rates dictate the degree of sexual size dimorphism in the Sardinian brook newt [Elektronische Daten] [Claudio Angelini, Giuseppe Sotgiu, Giulia Tessa, Jon Bielby, Stefano Doglio, Marco Favelli, Trenton Garner, Enrico Gazzaniga, Cristina Giacoma, Stefano Bovero] Sexual size dimorphism (SSD) is widespread among amphibians, and it is attributed to fecundity selection, invoked for female-biased-SSD species, sexual selection, usually invoked for male-biased-SSD species, or other forms of natural selection. Further, SSD interplays with body size variability at population level. By using a male-biased-SSD newt (Euproctus platycephalus) as model species, we investigated body size and SSD variability across the whole species' range, the island of Sardinia, looking for the main evolutionary force behind SSD. We found geographic variation of body size and SSD: newts from northern populations were generally larger than those from southern ones, with a larger degree of male biased dimorphism in the former. The mean age of newts varied among populations, but it did not follow any geographical pattern, and it did not differ between sexes. Southern populations reached sexual maturity earlier than northern ones, and maturity was positively correlated with temperature. Growth curves show that northern populations achieved male-biased SSD before reaching sexual maturity, whilst in the south males become larger than females after 6years in age, following a non-asymptotic growth curve. The geographical pattern of the adult body size variation is attributable to delayed maturation of the larger newts in more northerly populations, and earlier sexual maturation due to warmer temperature in southern populations, which leads to smaller body size. SSD varies consistently with body size: it is evident in the north, where sexual bimaturation caused larger males, but it is weak in the south, where warmer temperature caused an earlier maturation of both sexes. Springer International Publishing Switzerland, 2014 Euproctus platycephalus nationallicence Body size nationallicence Intraspecific variability nationallicence Sexual maturity nationallicence Sexual size dimorphism nationallicence Sardinia nationallicence Angelini Claudio Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut Sotgiu Giuseppe Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut Tessa Giulia Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut Bielby Jon Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut Doglio Stefano Società Romana di Scienze Naturali, via Fratelli Maristi 43, 00137, Rome, Italy aut Favelli Marco Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut Garner Trenton Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut Gazzaniga Enrico Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut Giacoma Cristina Dipartimento di Scienze della Vita e Biologia dei Sistemi, Università degli Studi di Torino, via Accademia Albertina 13, 10123, Turin, Italy aut Bovero Stefano Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut Evolutionary Ecology Springer International Publishing 29/1(2015-01-01), 169-184 0269-7653 29:1<169 2015 29 10682 https://doi.org/10.1007/s10682-014-9717-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10682-014-9717-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Angelini Claudio Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut NATIONALLICENCE 700 1- Sotgiu Giuseppe Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut NATIONALLICENCE 700 1- Tessa Giulia Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut NATIONALLICENCE 700 1- Bielby Jon Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut NATIONALLICENCE 700 1- Doglio Stefano Società Romana di Scienze Naturali, via Fratelli Maristi 43, 00137, Rome, Italy aut NATIONALLICENCE 700 1- Favelli Marco Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut NATIONALLICENCE 700 1- Garner Trenton Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut NATIONALLICENCE 700 1- Gazzaniga Enrico Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut NATIONALLICENCE 700 1- Giacoma Cristina Dipartimento di Scienze della Vita e Biologia dei Sistemi, Università degli Studi di Torino, via Accademia Albertina 13, 10123, Turin, Italy aut NATIONALLICENCE 700 1- Bovero Stefano Zirichiltaggi S.W.C., strada vicinale Filigheddu 62/c, 07100, Sassari, Italy aut NATIONALLICENCE 773 0- Evolutionary Ecology Springer International Publishing 29/1(2015-01-01), 169-184 0269-7653 29:1<169 2015 29 10682