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Title of Journal: Oecologia

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Abbravation: Oecologia

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Springer-Verlag

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DOI

10.1016/0926-860x(96)80046-9

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1432-1939

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Developmental instability in a stemmining sawfly

Authors: Héctor A Cárcamo Kevin D Floate Byron L Lee Brian L Beres Fran R Clarke
Publish Date: 2008/03/08
Volume: 156, Issue: 3, Pages: 505-513
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Abstract

Fluctuating asymmetry FA may be a sensitive indicator of the stress experienced by organisms during their development Its use in this manner is an intuitively appealing frequently proposed and potentially powerful tool but remains controversial partially because its underlying premise rarely has been critically tested Such tests should include direct comparisons among individuals for which levels of FA stress and fitness have been unambiguously quantified We assessed the use of FA as a bioindicator of the stress experienced during eggtoadult development by the stemmining sawfly Cephus cinctus Norton Sawflies were reared in a common garden from seven different wheat cultivars which were selected to represent a gradient of stem solidness a key factor imposing stress on sawflies during development In this model system stress was quantified by the weight of emergent adults Fitness was quantified by counting the number of eggs in dissected females which emerge with their full lifetime complement FA was measured for wing length three wing cells and three wing veins using image analyses The greatest amount of stress was induced by solidstemmed cultivars from which the adults were significantly smaller than those developing in hollowstemmed hosts In turn adult weight was positively correlated with fitness The net effect was a 25fold variation in sawfly fitness which gave a reasonable expectation that FA levels would differ across cultivars However FA levels of all the traits were similar among cultivars and there was no negative relationship between FA and fitness These results 1 document the failure of FA as an indicator of stress in this model system 2 identify adult weight as a satisfactory indicator of plantinduced stress and sawfly fitness and 3 add to the growing body of literature questioning the value of FA as a biomonitor tool of developmental stressWe thank B Lounds and C Klima for technical assistance This study was funded mainly through Agriculture and AgriFood Canada’s AAFC Abase and partly through the Matching Investment Initiative program matched to external funds received by B Beres from the Western Grains Research Foundation for cereal germplasm evaluation The experiments performed comply with the current laws of Canada

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