Tolerance to Copper and to Salinity in Daphnia longispina: Implications within a Climate Change Scenario

被引:15
|
作者
Leitao, Joao [1 ]
Ribeiro, Rui [2 ]
Soares, Amadeu M. V. M. [1 ,3 ]
Lopes, Isabel [1 ,3 ]
机构
[1] Univ Aveiro, Dept Biol, P-3800 Aveiro, Portugal
[2] Univ Coimbra, Dept Life Sci, IMAR Inst Mar, Coimbra, Portugal
[3] Univ Aveiro, CESAM, P-3800 Aveiro, Portugal
来源
PLOS ONE | 2013年 / 8卷 / 08期
关键词
DRIVEN GENETIC EROSION; STRESSED POPULATIONS; CATION COTOLERANCE; FIELD POPULATIONS; CO-TOLERANCE; FRESH; RESISTANCE; MINE; TOXICITY; GROWTH;
D O I
10.1371/journal.pone.0068702
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Considering IPPC climate change scenarios, it is pertinent to predict situations where coastal ecosystems already impacted with chemical contamination became exposed to an additional stressor under a future scenario of seawater intrusion. Accordingly, the present study aimed at evaluating if a negative association between tolerance to a metal and to saltwater exists among genotypes of a freshwater organism. For this, five clonal lineages of the cladoceran Daphnia longispina O.F. Muller, exhibiting a differential tolerance to lethal levels of copper, were selected. Each clonal lineage was exposed to lethal and sublethal concentrations of sodium chloride (assumed as a protective surrogate to evaluate the toxicity of increased salinity to freshwater organisms). Mortality, time to release the first brood and total number of neonates per female were monitored and the somatic growth rate and intrinsic rate of natural increase were computed for each clonal lineage. Data here obtained were compared with their lethal responses to copper and significant negative correlations were found. These results suggest that genetically eroded populations of D. longispina, due to copper or salinity, may be particularly susceptible to a later exposure to the other contaminant supporting the multiple stressors differential tolerance.
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页数:6
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