Physiological performance of three calcifying green macroalgae Halimeda species in response to altered seawater temperatures  

作　　者：Zhangliang Wei Jiahao Mo Ruiping Huang Qunju Hu Chao Long Dewen Ding Fangfang Yang Lijuan Long 

机构地区：[1]CAS Key Laboratory of Tropical Marine Bio-resources and Ecology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]State Key Laboratory of Marine Environmental Science,College of Ocean and Earth Sciences,Xiamen University,Xiamen 361102,China [4]First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China

出　　处：《Acta Oceanologica Sinica》2020年第2期89-100,共12页海洋学报（英文版）

基　　金：The Guangzhou Science and Technology Project under contract No.201707010174;the Strategic Priority Research Program of the Chinese Academy Sciences under contract No.XDA13020203;the Ocean Public Welfare Scientific Research Project under contract No.201305018-3

摘　　要：The effects of seawater temperature on the physiological performance of three Halimeda species were studied for a period of 28 d.Five treatments were established for Halimeda cylindracea,Halimeda opuntia and Halimeda lacunalis,in triplicate aquaria representing a factorial temperature with 24°C,28°C,32°C,34°C and 36°C,respectively.The average Fv/Fm of these species ranged from 0.732 to 0.756 between 24°C and 32°C but declined sharply between 34°C(0.457±0.035)and 36°C(0.122±0.014).Calcification was highest at 28°C,with net calcification rates(Gnet)of(20.082±2.482)mg/(g·d),(12.825±1.623)mg/(g·d)and(6.411±1.029)mg/(g·d)for H.cylindracea,H.opuntia and H.lacunalis,respectively.Between 24°C and 32°C,the specific growth rate(SGR)of H.lacunalis(0.079%–0.110%d–1)was lower than that of H.cylindracea(0.652%–1.644%d–1)and H.opuntia(0.360%–1.527%d–1).Three Halimeda species gradually bleached at 36°C during the study period.Malondialdehyde(MDA)and proline levels in tissues of the three Halimeda were higher in 34–36°C than those in 24–32°C.The results indicate that seawater temperature with range of 24–32°C could benefit the growth and calcification of these Halimeda species,however,extreme temperatures above 34°C have negative impacts.The measured physiological parameters also revealed that H.cylindracea and H.opuntia displayed broader temperature tolerance than H.lacunalis.The effects of seawater temperature on the physiological performance of three Halimeda species were studied for a period of 28 d. Five treatments were established for Halimeda cylindracea, Halimeda opuntia and Halimeda lacunalis, in triplicate aquaria representing a factorial temperature with 24°C, 28°C, 32°C, 34°C and 36°C,respectively. The average Fv/Fm of these species ranged from 0.732 to 0.756 between 24°C and 32°C but declined sharply between 34°C（0.457±0.035） and 36°C（0.122±0.014）. Calcification was highest at 28°C, with net calcification rates（Gnet） of（20.082±2.482） mg/（g·d）,（12.825±1.623） mg/（g·d） and（6.411±1.029） mg/（g·d） for H.cylindracea, H. opuntia and H. lacunalis, respectively. Between 24°C and 32°C, the specific growth rate（SGR） of H.lacunalis(0.079%–0.110% d–1) was lower than that of H. cylindracea(0.652%–1.644% d–1) and H. opuntia(0.360%–1.527% d–1). Three Halimeda species gradually bleached at 36°C during the study period.Malondialdehyde（MDA） and proline levels in tissues of the three Halimeda were higher in 34–36°C than those in24–32°C. The results indicate that seawater temperature with range of 24–32°C could benefit the growth and calcification of these Halimeda species, however, extreme temperatures above 34°C have negative impacts. The measured physiological parameters also revealed that H. cylindracea and H. opuntia displayed broader temperature tolerance than H. lacunalis.

关 键 词：calcifying macroalgae climate change seawater temperature physiological performance photosynthesis CALCIFICATION 

分 类 号：Q945[生物学—植物学]