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Estimates of Fuegian sprat consumption by humpback whales in the Magellan Strait feeding area as predicted by a bioenergetic model
Marine Ecology Progress Series ( IF 2.5 ) Pub Date : 2021-01-07 , DOI: 10.3354/meps13543
J Acevedo 1, 2 , J Urbán 3
Affiliation  

ABSTRACT: Knowing the biomass of prey consumed by a marine predator is a prerequisite for assessing the potential of the predator for competition with fisheries. Here, we estimated the biomass of Fuegian sprat Sprattus fueguensis consumed annually by a small subpopulation of humpback whales Megaptera novaeangliae in the Magellan Strait feeding area. We used a velocity-dependent bioenergetic model that integrates annual energy requirements by sex, age class, and reproductive status, proportion of Fuegian sprat in the diet, and annual population size of whales. The annual energy required in kcal per individual whale was estimated to be 18.88 × 107 for calves, 27.92 × 107 for adults, 30.71 × 107 for pregnant females, and 42.59 × 107 for lactating females. These estimates result in an energy requirement of 19.32 × 109 and 23.41 × 109 for a seasonal abundance of 78 and 96 whales, respectively. Bayesian dietary mixing models predict that Fuegian sprat represented between 27 and 33% of the diet of the whales. This implies that humpback whales remove between 2965 and 3896 t of Fuegian sprat per year during a feeding period of 120 d. However, if estimates are extended to an abundance of 204 humpback whales during the period 2004-2017, the consumption is elevated to 8167-8383 t yr-1. The estimates provided here are useful to apply as input data for consumption by humpback whales in the Fuegian sprat fishery management as well as for conservation plans of this small and vulnerable feeding subpopulation of humpback whales.

中文翻译:

生物能模型预测的麦哲伦海峡觅食区座头鲸的福吉斯鲱鱼消费量

摘要:了解海洋捕食者消耗的猎物生物量是评估捕食者与渔业竞争潜力的前提。在这里,我们估计Fuegian鲱鱼的生物质黍fueguensis通过的座头鲸小亚群每年消费学名Megaptera novaeangliae在麦哲伦海峡饲养区。我们使用了一种依赖于速度的生物能模型,该模型综合了按性别,年龄和生殖状况,饮食中福建鲱鱼的比例以及鲸鱼的年种群规模计算的年度能量需求。在每个个体鲸千卡所需的年能量估计为18.88×10 7犊牛,27.92×10 7对于成年人来说,30.71×10 7对于怀孕的女性,哺乳期女性为42.59×10 7。这些估算结果得出,对于季节性丰富的78条鲸鱼,分别需要19.32×10 9和23.41×10 9的能量。贝叶斯饮食混合模型预测,福冈鲱鱼占鲸鱼饮食的27%至33%。这意味着在120 d的喂食期间,座头鲸每年要捕捞2965到3896 t的福建鲱。但是,如果在2004-2017年期间将估计数量扩大到204头座头鲸,则消费量将增加到8167-8383 t yr -1。此处提供的估算值可作为输入数据,用于福吉斯鲱鱼渔业管理中的座头鲸消费,以及该座头鲸的小而脆弱的饲料亚群的保护计划。
更新日期:2021-01-07
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