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Thermal tolerance of early development in tropical and temperate sea urchins: inferences for the tropicalization of eastern Australia

机译:热带和温带海胆早期发育的耐热性:澳大利亚东部热带化的推论

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摘要

The thermal envelope of development to the larval stage of two echinoids from eastern Australia was characterized to determine whether they fill their potential latitudinal ranges as indicated by tolerance limits. The tropical sand dollar, Arachnoides placenta, a species that is not known to have shifted its range, was investigated in Townsville, northern Australia (19°20′S, 146°77′E), during its autumn spawning season (May 2012). The subtropical/temperate sea urchin, Centrostephanus rodgersii, a species that has undergone poleward range expansion, was investigated in Sydney, southern Australia (33°58′S, 151°14′E), during its winter spawning season (August 2012). The thermal tolerance of development was determined in embryos and larvae reared at twelve temperatures. For A. placenta, the ambient water temperature near Townsville and experimental control were 24 ℃ and treatments ranged from 14 to 37 ℃. For C. rodgersii, ambient Sydney water temperature and experimental control were 17 ℃, and the treatment range was 9-31 ℃. A. placenta had a broader developmental thermal envelope (14 ℃ range 17-31 ℃) than C. rodgersii (9 ℃ range 13-22 ℃). Both species developed successfully at temperatures well below ambient, suggesting that cooler water is not a barrier to poleward migration for either species. Both species presently live near the upper thermal limits for larval development, and future ocean warming could lead to contractions of their northern range limits. This study provides insights into the factors influencing the realized and potential distribution of planktonic life stages and changes to adult distribution in response to global change.
机译:表征了来自澳大利亚东部的两种类chin碱发育到幼体阶段的热封层,以确定它们是否满足了公差极限所指示的潜在纬度范围。在其秋季产卵季节(2012年5月),在澳大利亚北部汤斯维尔(19°20′S,146°77′E)调查了热带沙钱Arachnoides胎盘(一个未知范围的物种)。 。亚热带/温带海胆,Centrostephanus rodgersii,已经经历极地范围扩展,在其冬季产卵季节(2012年8月)在澳大利亚南部悉尼(33°58′S,151°14′E)进行了调查。在十二个温度下饲养的胚胎和幼虫中确定发育的热耐受性。对于胎盘曲霉,汤斯维尔附近和实验对照组的环境水温为24℃,处理范围为14到37℃。对于罗氏梭菌,悉尼的环境水温和实验控制温度均为17℃,处理范围为9-31℃。胎盘草比罗氏梭菌(9℃13-22℃)具有更宽的发育热范围(14℃17-31℃)。两种物种都在远低于环境温度的条件下成功发育,这表明较冷的水不是这两种物种向极迁徙的障碍。目前这两个物种都生活在幼体发育的高温上限附近,未来的海洋变暖可能会导致其北部范围极限的收缩。这项研究提供了对影响浮游生命阶段的实现和潜在分布以及响应全球变化而改变成年分布的因素的见解。

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  • 来源
    《Marine biology》 |2014年第2期|395-409|共15页
  • 作者单位

    School of Medical Sciences, University of Sydney, Sydney, NSW 2006, Australia;

    Department of Marine Science, University of Otago, Dunedin, New Zealand;

    Australian Institute of Marine Science, Townsville, QLD, Australia;

    School of Medical Sciences, University of Sydney, Sydney, NSW 2006, Australia,School of Biological Sciences, University of Sydney, Sydney, NSW 2006, Australia;

    School of Medical Sciences, University of Sydney, Sydney, NSW 2006, Australia,School of Biological Sciences, University of Sydney, Sydney, NSW 2006, Australia;

    National Marine Science Centre, Southern Cross University, Coffs Harbour, NSW, Australia;

    School of Medical Sciences, University of Sydney, Sydney, NSW 2006, Australia,School of Biological Sciences, University of Sydney, Sydney, NSW 2006, Australia;

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