Alterations in gill structure in tropical reef fishes as a result of elevated temperatures.
Alterations in gill structure in tropical reef fishes as a result of elevated temperatures.
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DOI：
10.1016/j.cbpa.2014.05.011
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发表时间：
2014-09
影响因子：
2.3
通讯作者：
Rummer, J. L.
中科院分区：
文献类型：
--
作者：
Bowden, A. J.;Gardiner, N. M.;Couturier, C. S.;Stecyk, J. A. W.;Nilsson, G. E.;Munday, P. L.;Rummer, J. L.
热带地区预计将是受海面温度上升影响最大的地区之一，因为季节性温度变化很小。随着温度的升高，溶解在水中的氧气越来越少，但鱼类的代谢需求，因此，对有效摄氧量的需求，增加了。鳃重塑是一种适应策略，在经历温度和氧气的巨大季节性变化的淡水鲤科动物以及暴露在空气中的两栖鳉鱼中都有很好的记录。然而，没有研究调查过热带珊瑚礁鱼类是否会重塑它们的鳃，以适应在高温下增加的氧气需求。我们测试了巴布亚新几内亚北部（2°35.765′S; 150°46.193′E）种群的5种珊瑚礁物种（Acanthochromis polyacanthus, Chromis atripectoralis, Pomacentrus moluccensis， Dascyllus melanurus和Cheilodipterus quinquelineatus）的鳃重塑。鱼在12-14天内适应29°C和31°C，包括它们的季节范围（29-31°C），以及33°C和34°C，以解释世纪末的预测温度。我们测量了第2鳃弓上的5条细丝的片层周长、横截面积、基底厚度和长度，并通过扫描电子显微镜（SEM）对第3鳃弓进行了定性评估。各树种在叶片上的定量测量结果存在显著差异，但随温度变化趋势不一致。扫描电镜只显示了P. moluccensis鳃形态的改变。鳃形态总体上缺乏随温度升高的变化，这表明除非采用其他适应机制，否则这些近赤道珊瑚鱼可能无法在未来的气候情景下保持足够的氧气吸收。
Tropical regions are expected to be some of the most affected by rising sea surface temperatures (SSTs) because seasonal temperature variations are minimal. As temperatures rise, less oxygen dissolves in water, but metabolic requirements of fish and thus, the demand for effective oxygen uptake, increases. Gill remodelling is an acclimation strategy well documented in freshwater cyprinids experiencing large seasonal variations in temperature and oxygen as well as an amphibious killifish upon air exposure. However, no study has investigated whether tropical reef fishes remodel their gills to allow for increased oxygen demands at elevated temperatures. We tested for gill remodelling in five coral reef species (Acanthochromis polyacanthus, Chromis atripectoralis, Pomacentrus moluccensis, Dascyllus melanurus and Cheilodipterus quinquelineatus) from populations in northern Papua New Guinea (2° 35.765′ S; 150° 46.193′ E). Fishes were acclimated for 12-14 days to 29 and 31 °C, encompassing their seasonal range (29-31 °C), and 33 and 34 °C to account for end-of-century predicted temperatures. We measured lamellar perimeter, cross-sectional area, base thickness, and length for five filaments on the 2nd gill arches and qualitatively assessed 3rd gill arches via scanning electron microscopy (SEM). All species exhibited significant differences in the quantitative measurements made on the lamellae, but no consistent trends with temperature were observed. SEM only revealed alterations in gill morphology in P. moluccensis. The overall lack of changes in gill morphology with increasing temperature suggests that these near-equatorial reef fishes may fail to maintain adequate O2 uptake under future climate scenarios unless other adaptive mechanisms are employed.
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影响因子：
3.7
作者：
Gardiner NM;Munday PL;Nilsson GE
通讯作者：
Nilsson GE
影响因子：
1.6
作者：
GRAY, IE
通讯作者：
GRAY, IE
影响因子：
2.7
作者：
Handy, RD;Runnalls, T;Russell, PM
通讯作者：
Russell, PM
DOI：
10.1017/s0025315400030319
发表时间：
1984-01-01
影响因子：
1.2
作者：
HUGHES, GM
通讯作者：
HUGHES, GM
影响因子：
11.6
作者：
Nilsson, Goran E.;Crawley, Natalie;Munday, Philip L.
通讯作者：
Munday, Philip L.