A physiological crisis drives the coral recruitment bottleneck.

IF 2.8 2区 生物学 Q2 BIOLOGY
Biology Letters Pub Date : 2025-06-01 Epub Date: 2025-06-18 DOI:10.1098/rsbl.2025.0103
Peter Edmunds, Adrian Cheh, Scott Burgess
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引用次数: 0

Abstract

Recruitment failure is an important factor contributing to population declines of tropical corals. Because the causes of death for juvenile corals are unclear, it is challenging to predict how recruitment bottlenecks will change in the future. We tested the hypothesis that depletion of metabolic reserves increases mortality of juvenile corals under thermal stress. Metabolic reserves of juvenile colonies (<30 mm diameter) of broadcast spawning Pocillopora from Moorea, French Polynesia, were manipulated using elevated temperature to increase respiration, and reduced day length to decrease photosynthesis, and estimated as biomass. Corals with high or low biomass were incubated at 28°C and 31°C for 15 days. Juvenile P. meandrina with high biomass were six times more likely to die at 31°C versus 28°C, but corals with low biomass were 48 times more likely to die at 31°C versus 28°C. When juvenile Pocillopora were grown in seawater augmented with bicarbonate to reduce the cost of skeletogenesis in support of growth, growth was not affected, but energy expenditure was reduced by 20% to reduce reliance on metabolic reserves. Resource limitation of juvenile corals can affect their response to elevated temperatures, supporting the hypothesis that a physiological crisis initiated by resource limitation mediates the stringency of recruitment bottlenecks.

生理危机导致了珊瑚繁殖的瓶颈。
繁殖失败是导致热带珊瑚数量下降的重要因素。由于幼珊瑚的死亡原因尚不清楚,因此预测未来的招聘瓶颈将如何变化是一项挑战。我们测试了一个假设,即代谢储备的消耗会增加热应激下幼珊瑚的死亡率。研究了法属波利尼西亚Moorea的Pocillopora幼虫的代谢储备,通过提高温度来增加呼吸作用,减少日照来减少光合作用,并估算了生物量。生物量高或低的珊瑚分别在28°C和31°C下孵育15天。高生物量的meandrina幼鱼在31°C的死亡率是28°C的6倍,而低生物量的珊瑚在31°C的死亡率是28°C的48倍。当poillopora幼鱼在添加了碳酸氢盐的海水中生长以降低骨骼形成的成本以支持生长时,生长不受影响,但能量消耗减少了20%,以减少对代谢储备的依赖。幼珊瑚的资源限制会影响它们对温度升高的反应,这支持了由资源限制引发的生理危机介导招募瓶颈的严格性的假设。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Biology Letters
Biology Letters 生物-进化生物学
CiteScore
5.50
自引率
3.00%
发文量
164
审稿时长
1.0 months
期刊介绍: Previously a supplement to Proceedings B, and launched as an independent journal in 2005, Biology Letters is a primarily online, peer-reviewed journal that publishes short, high-quality articles, reviews and opinion pieces from across the biological sciences. The scope of Biology Letters is vast - publishing high-quality research in any area of the biological sciences. However, we have particular strengths in the biology, evolution and ecology of whole organisms. We also publish in other areas of biology, such as molecular ecology and evolution, environmental science, and phylogenetics.
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