title: Pesticide exposure impacts not only hatching of dormant eggs, but also hatchling survival and performance in the water flea Daphnia magna.
abstract: Laboratory ecotoxicity tests and biomonitoring in aquatic systems are currently based on the active component of invertebrate communities. Even though dormant egg banks are crucial for the long term survival and community dynamics of many aquatic organisms, the effects of anthropogenic activities on dormant egg bank dynamics have rarely been studied. In this study we investigated the effects of two pesticides with a different mode of action (carbaryl and fenoxycarb) on hatching of Daphnia magna dormant eggs (ephippia) as well as on survival, growth and reproduction of the hatched neonates. Dormant eggs were exposed to the pesticides simultaneously to incubation under conditions that induce hatching (long daylight and 20 °C). Carbaryl had no negative effects on embryonic development or hatching rate up to concentrations almost 1,000 times the median effect concentration (EC50) of neonate survival in acute tests. Fenoxycarb, however, had a significant dose-related effect by delaying or completely stopping the hatching process and caused severe abnormalities in developing individuals. Both pesticides had significant negative effects on survival and reproduction of the hatchlings. These results indicate that, in addition to inducing mortality of active individuals, pesticides can affect zooplankton communities by altering hatching dynamics and life history traits of hatched individuals. We briefly discuss how such pollution induced changes in the benthic-pelagic coupling could translate into trans-generational effects impacting ecological and evolutionary dynamics.
authors: Laboratory of Aquatic Ecology, Evolution and Conservation, University of Leuven, Charles Deberiotstraat 32, 3000 Leuven, Belgium. Sabine.Navis@bio.kuleuven.be
authors: Sabine
authors: S
authors: Navis
authors: Aline
authors: A
authors: Waterkeyn
authors: Tom
authors: T
authors: Voet
authors: Luc
authors: L
authors: De Meester
authors: Luc
authors: L
authors: Brendonck
mesh_terms: D000818:Animals; D012721:Carbaryl / Q000633:toxicity*; D003621:Daphnia / Q000187:drug effects / Q000502:physiology; D004305:Dose-Response Relationship, Drug; D004625:Embryo, Nonmammalian / Q000187:drug effects; D005260:Female; D007814:Larva / Q000187:drug effects; D008136:Longevity / Q000187:drug effects; D010058:Oviposition / Q000187:drug effects; D010063:Ovum / Q000187:drug effects*; D010575:Pesticides / Q000633:toxicity*; D048448:Phenylcarbamates / Q000633:toxicity*; D018675:Toxicity Tests; D014873:Water Pollutants / Q000633:toxicity*; D015048:Zooplankton / Q000187:drug effects / Q000254:growth & development
chemical_list: D010575:Pesticides; D048448:Phenylcarbamates; D014873:Water Pollutants; C052034:fenoxycarb; D012721:Carbaryl
references: Chemosphere. 2006 Jun;63(9):1477-84
references: 16289230
references: Environ Int. 2005 May;31(4):615-20
references: 15788202
references: J Environ Sci (China). 2007;19(6):733-7
references: 17969648
references: Oecologia. 2005 Jan;142(1):109-16
references: 15378346
references: Bull Environ Contam Toxicol. 1986 Aug;37(2):289-96
references: 3742084
references: J Exp Zool A Comp Exp Biol. 2004 Oct 1;301(10):793-801
references: 15449346
references: Environ Toxicol Chem. 2009 Jun;28(6):1218-26
references: 19132812
references: Ecotoxicology. 2007 Feb;16(1):197-203
references: 17235669
references: Chemosphere. 2003 Dec;53(8):827-33
references: 14505703
references: Environ Toxicol Pharmacol. 2011 Jul;32(1):102-6
references: 21787735
references: Chemosphere. 2009 Jul;76(3):335-40
references: 19403157
references: Proc Natl Acad Sci U S A. 1997 Aug 19;94(17):9171-5
references: 11038565
references: Environ Toxicol Chem. 2002 May;21(5):1058-64
references: 12013128
references: J Environ Sci Health A Tox Hazard Subst Environ Eng. 2003 Jun;38(6):1065-71
references: 12774909
references: Ecotoxicol Environ Saf. 2004 Jun;58(2):246-55
references: 15157579
references: Ecotoxicology. 2007 Feb;16(1):61-81
references: 17235672
references: Environ Toxicol Chem. 2006 Feb;25(2):552-9
references: 16519319
references: J Exp Zool. 2001 Jul 1;290(2):148-55
references: 11471144
references: Sci Total Environ. 2008 Jul 15;398(1-3):48-52
references: 18420254
references: Aquat Toxicol. 2009 Oct 19;95(1):71-9
references: 19747740
references: Chemosphere. 2005 Dec;61(8):1168-74
references: 16263386
references: Environ Monit Assess. 2003 Mar;82(3):265-80
references: 12602631
references: Aquat Toxicol. 2005 Sep 10;74(3):193-204
references: 16046008
references: Ecotoxicol Environ Saf. 2007 Jul;67(3):399-405
references: 17289144
references: Sci Total Environ. 2006 Jul 31;366(1):148-53
references: 16797674
references: Environ Toxicol Chem. 2007 Aug;26(8):1770-3
references: 17702354
references: Aquat Toxicol. 2007 Oct 30;84(4):439-49
references: 17720258
references: Environ Health Perspect. 2003 Jun;111(7):919-24
references: 12782492
references: Oecologia. 1999 May;119(2):159-165
references: 28307964
references: Mol Ecol. 2012 May;21(9):2160-75
references: 22257313