不同生态型虹鳟的高生长选择取代了从SDA到SMR的消化成本

IF 1.6 3区 农林科学 Q3 FISHERIES
Gauthier Monnet, Jordan S. Rosenfeld, Jeffrey G. Richards
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引用次数: 1

摘要

为了了解消化性能变化的驱动因素及其对生长的影响,我们研究了在相同的饲料(即商业食物颗粒)上以饱腹饲料饲养的快速生长的鱼食鱼和缓慢生长的食虫生态型虹鳟鱼幼鱼的食物消耗、消化代谢、食物加工效率和生长率之间的关系。相对于基础代谢较低、生长缓慢的食虫动物,尽管最大食物口粮要大得多,但生长较快的鱼食性动物通过减少餐后代谢的绝对成本,加上更短或相似的肠道停留时间和更高的同化效率,呈现出意想不到的更高消化效率模式。这些结果表明,通过将消化成本从SDA转移到SMR,可以减轻摄入较大食物后消化代谢的增加。降低总消化成本(SDA + SMR),同时保持较高的同化效率可能通过潜在的适应,包括:(1)增加肠道吸收能力;(2)随着日粮水平的提高,肠道运输时间缩短的规模经济效应;或者(3)一个永久更大的消化道,增加了维持成本,但减少了循环上调的需要和相关的间接成本。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Selection for high growth displaces costs of digestion from SDA to SMR in divergent ecotypes of rainbow trout

To understand the drivers of variation in digestive performance and their effects on growth, we examined relationships among food consumption, digestive metabolism, food processing efficiency, and growth rate in juveniles of fast-growing piscivore versus slow-growing insectivore ecotypes of rainbow trout reared at satiation rations on the same diet (i.e., commercial food pellets). Relative to slow-growing insectivores with lower basal metabolism, and despite a much larger maximum food ration, faster-growing piscivores presented an unexpected pattern of higher digestive efficiency through a reduction in the absolute costs of postprandial metabolism coupled with shorter or similar gut residence time and higher assimilation efficiency. These results suggest that the increase in digestive metabolism following the ingestion of larger meals can be mitigated by displacing the costs of digestion from SDA to SMR. Reducing total digestion costs (SDA + SMR) while maintaining higher assimilation efficiency may be possible through potential adaptations including (1) increased intestinal absorption capacity; (2) economies of scale that shorten gut transit time with increasing ration level; or (3) a permanently larger digestive tract that increases maintenance costs but reduces the need for cyclic upregulation and associated overhead costs.

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来源期刊
Ecology of Freshwater Fish
Ecology of Freshwater Fish 农林科学-海洋与淡水生物学
CiteScore
4.10
自引率
0.00%
发文量
45
审稿时长
12-24 weeks
期刊介绍: Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.
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