globalchange  > 过去全球变化的重建
DOI: 10.1371/journal.pone.0126231
论文题名:
Climate Effects on High Latitude Daphnia via Food Quality and Thresholds
作者: Anna Przytulska; Maciej Bartosiewicz; Milla Rautio; France Dufresne; Warwick F. Vincent
刊名: PLOS ONE
ISSN: 1932-6203
出版年: 2015
发表日期: 2015-5-13
卷: 10, 期:5
语种: 英语
英文关键词: Daphnia ; Cloning ; Latitude ; Fatty acids ; Zooplankton ; Phytoplankton ; Lakes ; Synechococcus
英文摘要: Climate change is proceeding rapidly at high northern latitudes and may have a variety of direct and indirect effects on aquatic food webs. One predicted effect is the potential shift in phytoplankton community structure towards increased cyanobacterial abundance. Given that cyanobacteria are known to be a nutritionally poor food source, we hypothesized that such a shift would reduce the efficiency of feeding and growth of northern zooplankton. To test this hypothesis, we first isolated a clone of Daphnia pulex from a permafrost thaw pond in subarctic Québec, and confirmed that it was triploid but otherwise genetically similar to a diploid, reference clone of the same species isolated from a freshwater pond in southern Québec. We used a controlled flow-through system to investigate the direct effect of temperature and indirect effect of subarctic picocyanobacteria (Synechococcus) on threshold food concentrations and growth rate of the high latitude clone. We also compared the direct effect of temperature on both Daphnia clones feeding on eukaryotic picoplankton (Nannochloropsis). The high latitude clone had a significantly lower food threshold for growth than the temperate clone at both 18 and 26°C, implying adaptation to lower food availability even under warmer conditions. Polyunsaturated fatty acids were present in the picoeukaryote but not the cyanobacterium, confirming the large difference in food quality. The food threshold for growth of the high latitude Daphnia was 3.7 (18°C) to 4.2 (26°C) times higher when fed Synechococcus versus Nannochloropsis, and there was also a significant negative effect of increased temperature and cyanobacterial food on zooplankton fatty acid content and composition. The combined effect of temperature and food quality on the performance of the high latitude Daphnia was greater than their effects added separately, further indicating the potentially strong indirect effects of climate warming on aquatic food web processes.
URL: http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0126231&type=printable
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/20910
Appears in Collections:过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响

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作者单位: Centre d’études nordiques (CEN), Université Laval, Québec, Québec, Canada;Département de biologie, Université Laval, Québec, Québec, Canada;Centre d’études nordiques (CEN), Université Laval, Québec, Québec, Canada;Centre Eau Terre Environnement, Institut National de la Recherche Scientifique, Québec, Québec, Canada;Centre d’études nordiques (CEN), Université Laval, Québec, Québec, Canada;Department of Fundamental Sciences, Université du Québec à Chicoutimi, Chicoutimi, Québec, Canada;Biology, Chemistry and Geography Department, Université du Québec à Rimouski, Rimouski, Québec, Canada;Centre d’études nordiques (CEN), Université Laval, Québec, Québec, Canada;Département de biologie, Université Laval, Québec, Québec, Canada

Recommended Citation:
Anna Przytulska,Maciej Bartosiewicz,Milla Rautio,et al. Climate Effects on High Latitude Daphnia via Food Quality and Thresholds[J]. PLOS ONE,2015-01-01,10(5)
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