TY - JOUR
T1 - A novel oxyconforming response in the freshwater fish Galaxias maculatus
AU - Urbina, Mauricio A.
AU - Glover, Chris N.
AU - Forster, Malcolm E.
N1 - Funding Information:
The authors acknowledge the excellent technical assistance of Gavin Robinson, Renny Bishop and Nick Etheridge. We are grateful for the feedback from two anonymous referees that improved this manuscript. This work was supported by a Marsden Grant from the Royal Society of New Zealand ( UOC0711 ). M.A.U was supported by a Ph.D. scholarship from the Chilean Government, CONICYT . Funding bodies had no direct role in the study.
PY - 2012/3
Y1 - 2012/3
N2 - How fish oxygen consumption is modulated by external PO2 has long been a matter of interest, yet is an experimentally complicated question to answer. In this study closed and semi-closed respirometry were used to evaluate the oxygen consumption rate of the scaleless galaxiid fish, inanga (Galaxias maculatus) as a function of decreasing external PO2. Both respirometry techniques showed that as environmental oxygen levels declined, oxygen consumption rates also decreased. At no point did inanga regulate oxygen consumption. This is strong evidence that inanga is an oxyconformer. Partitioned respirometry experiments showed that skin plays an important role in oxygen uptake in this fish species, and cutaneous oxygen uptake may have an important role in shaping the oxygen consumption response to hypoxia.
AB - How fish oxygen consumption is modulated by external PO2 has long been a matter of interest, yet is an experimentally complicated question to answer. In this study closed and semi-closed respirometry were used to evaluate the oxygen consumption rate of the scaleless galaxiid fish, inanga (Galaxias maculatus) as a function of decreasing external PO2. Both respirometry techniques showed that as environmental oxygen levels declined, oxygen consumption rates also decreased. At no point did inanga regulate oxygen consumption. This is strong evidence that inanga is an oxyconformer. Partitioned respirometry experiments showed that skin plays an important role in oxygen uptake in this fish species, and cutaneous oxygen uptake may have an important role in shaping the oxygen consumption response to hypoxia.
KW - Closed respirometry
KW - Hypoxia
KW - Oxyconforming
KW - Oxygen consumption
KW - Partitioned respirometry
KW - Semi-closed respirometry
UR - http://www.scopus.com/inward/record.url?scp=84856095186&partnerID=8YFLogxK
U2 - 10.1016/j.cbpa.2011.11.011
DO - 10.1016/j.cbpa.2011.11.011
M3 - Journal Article
C2 - 22138470
AN - SCOPUS:84856095186
SN - 1095-6433
VL - 161
SP - 301
EP - 306
JO - Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology
JF - Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology
IS - 3
ER -