Specialized adaptations allow vent-endemic crabs (Xenograpsus testudinatus) to thrive under extreme environmental hypercapnia

Garett J.P. Allen, Pou Long Kuan, Yung Che Tseng, Pung Pung Hwang, Alex R. Quijada-Rodriguez, Dirk Weihrauch*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

16 引文 斯高帕斯(Scopus)

摘要

Shallow hydrothermal vent environments are typically very warm and acidic due to the mixing of ambient seawater with volcanic gasses (> 92% CO2) released through the seafloor making them potential ‘natural laboratories’ to study long-term adaptations to extreme hypercapnic conditions. Xenograpsus testudinatus, the shallow hydrothermal vent crab, is the sole metazoan inhabitant endemic to vents surrounding Kueishantao Island, Taiwan, where it inhabits waters that are generally pH 6.50 with maximum acidities reported as pH 5.50. This study assessed the acid–base regulatory capacity and the compensatory response of X. testudinatus to investigate its remarkable physiological adaptations. Hemolymph parameters (pH, [HCO3], PCO2, [NH4+], and major ion compositions) and the whole animal’s rates of oxygen consumption and ammonia excretion were measured throughout a 14-day acclimation to pH 6.5 and 5.5. Data revealed that vent crabs are exceptionally strong acid–base regulators capable of maintaining homeostatic pH against extreme hypercapnia (pH 5.50, 24.6 kPa PCO2) via HCO3/Cl exchange, retention and utilization of extracellular ammonia. Intact crabs as well as their isolated perfused gills maintained PCO2tensions below environmental levels suggesting the gills can excrete CO2 against a hemolymph-directed PCO2 gradient. These specialized physiological mechanisms may be amongst the adaptations required by vent-endemic animals surviving in extreme conditions.

原文英語
文章編號11720
期刊Scientific reports
10
發行號1
DOIs
出版狀態已發佈 - 2020 12月 1
對外發佈

ASJC Scopus subject areas

  • 多學科

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