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Fitness consequences of alternative life histories in water striders, Aquarius remigis (Heteroptera: Gerridae)

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Abstract

Using field and laboratory observations and experiments over 3 years, I investigated whether reproductive trade-offs shape individual life histories in two natural populations of the water strider, Aquarius remigis, in which univoltine and bivoltine life cycles coexist. Both later eclosion dates and food shortages, even after adult eclosion, induced diapause in females, thus deferring reproduction to the following spring. Adult body size was positively affected by food availability during juvenile development. Higher food levels also increased the reproductive output of females, but not their longevity or oviposition period. When compared to spring breeders (univoltine life cycle), direct (summer) breeders (bivoltine life cycle) experienced reduced lifetime egg numbers and longevity, as well as reduced survivorship of their second-summer-generation offspring; these reproductive costs offset, at least in part, the advantage in non-decreasing populations of having two generations per year. Fecundity was correlated with body size, and among summer-generation females direct breeders were larger than non-breeders. The time remaining before the onset of winter and/or the time since adult eclosion augmented cumulative energy uptake, and consequently the lipid reserves and winter survival probability of non-breeding (diapausing) summer adults approaching hibernation. Overwintered spring reproductives died at faster rates than non-reproductive summer individuals despite greater food availability in spring, indicating a mortality cost of reproduction. Body length correlated with absolute and not with proportional lipid content but showed no consistent relationship with survivorship in the field. These results are in agreement with current theory on the evolution of insect voltinism patterns, and further indicate high degrees of life history flexibility (phenotypic plasticity) in the study populations in response to variable environmental factors (notably photoperiod and food availability). This may be related to their location in a geographic transition zone from uni- to bivoltine life cycles.

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  1. W. U. Blanckenhorn

    Present address: Zoologisches Museum der Universität Zürich-Irchel, Winterthurerstrasse 190, 8057, Zürich, Switzerland

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  1. Behavioural Ecology Group, Department of Biological Sciences, State University of New York, 12222, Albany, NY, USA

    W. U. Blanckenhorn

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Blanckenhorn, W.U. Fitness consequences of alternative life histories in water striders, Aquarius remigis (Heteroptera: Gerridae). Oecologia 97, 354–365 (1994). https://doi.org/10.1007/BF00317325

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  • DOI: https://doi.org/10.1007/BF00317325

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