The Widespread Threat of Calcium Decline in Fresh Waters

被引：253

作者：

Jeziorski, Adam ^{[1
]}

Yan, Norman D. ^{[2
,3
]}

Paterson, Andrew M. ^{[3
]}

DeSellas, Anna M. ^{[1
,3
]}

Turner, Michael A. ^{[4
]}

Jeffries, Dean S. ^{[5
]}

Keller, Bill ^{[6
]}

Weeber, Russ C. ^{[7
]}

McNicol, Don K. ^{[7
]}

Palmer, Michelle E. ^{[2
]}

McIver, Kyle ^{[1
]}

Arseneau, Kristina ^{[1
]}

Ginn, Brian K. ^{[1
]}

Cumming, Brian F. ^{[1
]}

Smol, John P. ^{[1
]}

机构：

[1] Queens Univ, Dept Biol, Paleoecol Environm Assessment & Res Lab, Kingston, ON K7L 3N6, Canada

[2] York Univ, Dept Biol, N York, ON M3J 1P3, Canada

[3] Ontario Minist Environm, Dorset Environm Sci Ctr, Dorset, ON P0A 1E0, Canada

[4] Fisheries & Oceans Canada, Expt Lakes Area, Winnipeg, MB R3T 2N6, Canada

[5] Environm Canada, Natl Water Res Inst, Burlington, ON L7R 4A6, Canada

[6] Laurentian Univ, Ontario Minist Environm, Cooperat Freshwater Ecol Unit, Sudbury, ON P3E 2C6, Canada

[7] Environm Canada, Canadian Wildlife Serv, Ottawa, ON K1A 0H3, Canada

来源：

SCIENCE | 2008年 / 322卷 / 5906期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1126/science.1164949

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：

Calcium concentrations are now commonly declining in softwater boreal lakes. Although the mechanisms leading to these declines are generally well known, the consequences for the aquatic biota have not yet been reported. By examining crustacean zooplankton remains preserved in lake sediment cores, we document near extirpations of calcium- rich Daphnia species, which are keystone herbivores in pelagic food webs, concurrent with declining lake- water calcium. A large proportion ( 62%, 47 to 81% by region) of the Canadian Shield lakes we examined has a calcium concentration approaching or below the threshold at which laboratory Daphnia populations suffer reduced survival and fecundity. The ecological impacts of environmental calcium loss are likely to be both widespread and pronounced.

引用

页码：1374 / 1377

页数：4

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