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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >The effect of gillnet capture on the metabolic rate of two shark species with contrasting lifestyles
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The effect of gillnet capture on the metabolic rate of two shark species with contrasting lifestyles

机译：刺网捕捞对生活方式不同的两种鲨鱼新陈代谢速率的影响

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In this study we investigated the metabolic consequences of simulated gillnet capture in species with contrasting life-history characteristics, the gummy shark, Mustelus antarcticus and the Port Jackson shark, Heterdontus portusjacksoni. Pre-stress standard and routine metabolic rates (MR) of individuals of these species were measured and compared to the MR obtained after simulated gillnet capture. Standard MRs of M. antarcticus and H. portusjacksoni were 168.5 +/- 61.9 mgO(2) kg(-0.67) h(-1) and 144.1 +/- 20.4 mgO(2)kg(-0.67) h(-1) , respectively. Routine MRs of M. antarcticus and H. portusjacksoni were 202.6 +/- 63.5 mgO(2) kg(-0.67) h(-1) and 166.4 +/- 11.2 mgO(2) kg(-0.67) h(-1), respectively. The simulated gillnet-capture treatment decreased the MR of M. antarcticus by 59.3% and increased that of H. portusjacksoni by 21.6%. Our results confirm that M. antarcticus is highly sensitive to gillnet capture, exhibiting significant variability in MR among individuals and also a high delayed mortality rate. We interpret the decrease in MR as a compensatory mechanism for reducing oxygen consumption to cope with the stress imposed by capture. Mortality in this species was associated with higher pre-stress MR, and lower post-stress MR. In contrast, H. portusjacksoni showed mild increases in MR. Their resilience to capture stress most likely relies on effective buccal pumping and lower basal MR. A mixed-effects model approach permitted us to identify the main sources of variation in the MR measured, which were the individual differences, treatment effects, species variations and delayed mortality. The comparative approach employed in this work allowed us to understand and provide reliable estimates of the effects of fishing on the MRs of these two species.
机译：在这项研究中，我们调查了模拟刺网捕获在具有相反生活史特征的物种中的胶结鲨鱼的软糖鲨鱼南极芥末和杰克逊港鲨鱼Heterdontus portusjacksoni。测量这些物种个体的应激前标准和常规代谢率（MR），并将其与模拟刺网捕获后获得的MR进行比较。南极分支杆菌和Portusjacksoni的标准MRs为168.5 +/- 61.9 mgO（2）kg（-0.67）h（-1）和144.1 +/- 20.4 mgO（2）kg（-0.67）h（-1） ， 分别。南极分支杆菌和Portusjacksoni的常规MR为202.6 +/- 63.5 mgO（2）kg（-0.67）h（-1）和166.4 +/- 11.2 mgO（2）kg（-0.67）h（-1） ， 分别。模拟刺网捕获处理使南极分支杆菌的MR降低了59.3％，而波氏梭菌的MR则提高了21.6％。我们的结果证实，南极分支杆菌对刺网捕获高度敏感，在个体之间的MR中表现出显着的变异性，并且还具有较高的延迟死亡率。我们将MR的减少解释为一种减少氧气消耗的补偿性机制，以应对捕获带来的压力。该物种的死亡率与较高的应激前MR和较低的应激后MR有关。相反，H。portusjacksoni显示MR轻度升高。它们对压力的抵抗力很可能依赖于有效的颊吸和较低的基础MR。混合效应模型方法使我们能够确定测得的MR变异的主要来源，即个体差异，治疗效果，物种变异和延迟死亡。在这项工作中采用的比较方法使我们能够了解并提供可靠的渔业捕捞对这两个物种的MR影响的估计。

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    《Journal of Experimental Marine Biology and Ecology》 |2020年第5期|151354.1-151354.11|共11页
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    Consejo Nacl Invest Cient & Tecn Inst Argentino Oceanog Bahia Blanca Buenos Aires Argentina|Monash Univ Sch Biol Sci Clayton Vic 3800 Australia;

    Monash Univ Sch Biol Sci Clayton Vic 3800 Australia;

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