Heat tolerance, behavioural temperature selection and temperature-dependent respiration in larval Octopus huttoni

作者: Fiona A. Higgins , Amanda E. Bates , Miles D. Lamare

DOI: 10.1016/J.JTHERBIO.2011.11.004

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摘要: This study reports temperature effects on paralarvae from a benthic octopus species, Octopus huttoni, found throughout New Zealand and temperate Australia. We quantified the thermal tolerance, preference temperature-dependent respiration rates in 1–5 days old paralarvae. Thermal stress (1 °C increase h−1) selection (∼10–24 °C vertical gradient) experiments were conducted with reared for 4 at 16 °C. In addition, measurement of oxygen consumption 10, 15, 20 25 °C was made aged 1, 5 using microrespirometry. Onset spasms, rigour (CTmax) mortality (upper lethal limit) occurred 50% experimental animals at, respectively, 26.0±0.2 °C, 27.8±0.2 °C 31.4±0.1 °C. The upper, 23.1±0.2 °C, lower, 15.0±1.7 °C, temperatures actively avoided by correspond range over which normal behaviours observed experiments. Over 10 °C–25 °C, rates, standardized an individual larva, increased age, 54.0 to 165.2 nmol larvae−1 h−1 one-day larvae 40.1–99.4 nmol h−1 five days. Older showed lesser response temperature: effect increasing (Q10) (Q10=1.35) lower when compared 1 day (Q10=1.68). Q10 older may reflect age-related changes metabolic processes or greater scope respond such as reducing activity. Collectively, our data indicate that >25 °C be critical temperature. Further studies population-level variation tolerance this species are warranted predict how continued increases ocean will limit O. huttoni early larval stages across species.

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