Lagarde R. auteur aut IRD Ponton Dominique auteur aut IRD Borie G. auteur aut IRD Hiebert A. auteur aut IRD LeMoine C. M. R. auteur aut IRD text journalArticle eng text/pdf born digital access The life cycle of gobies of the Sicydiinae subfamily depends on climbing waterfalls. Two sympatric sicydiines species from Reunion Island, Sicyopterus lagocephalus (SIL) and Cotylopus acutipinnis (COA), employ different climbing modes. SIL uses a steady "inching" mode interrupted by short rest periods, whereas COA exhibits short "power-burst" undulatory movements punctuated by longer rest periods. Consequently, we explored the relationship between climbing performance and metabolic activity in these two species. We demonstrated that the two climbing modes are supported by different ecophysiological profiles that promote the interspecific variability of locomotor performance. More specifically, SIL performed better than COA during a climbing experiment because of its inching climbing mode, supported by a generally greater metabolic capacity and a higher potential for oxidative metabolism. Interestingly, we did not detect any difference in metabolic fuel storage and lactate production during climbing in either species, suggesting that these species can maintain fuel reserves and limit lactate accumulation through extensive rest times. Overall, this study provides new insights into the ecophysiology of these two emblematic species and suggests that the better climbing capacity of SIL is supported by its muscular metabolic capacity. specialized amphidromy Cotylopus acutipinnis enzymatic profile metabolic fuel migration Sicyopterus lagocephalus REUNION 034 93 5 376-383 2020 1522-2152 https://www.documentation.ird.fr/hor/fdi:010079491 10.1086/710536 1522-2152 [F B010079491] https://www.documentation.ird.fr/hor/fdi:010079491 https://www.documentation.ird.fr/intranet/publi/2020/08/010079491.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2020-09-17 2025-02-24 fdi:010079491 fre