Michael C. Singer

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1. Department of Ecology and Systematics, Division of Population Biology, P.O. Box 17 (Arkadiankatu 7), University of Helsinki, FIN-00014 Helsinki, Finland; 2. Section of Integrative Biology, University of Texas, Austin, Texas 78712; 3. Sydväst Polytechnic, Forstinstitutsvägen, FIN-10600 Ekenäs, Finland; 4. Lehrstuhl für Landschaftsökologie,(More)
Climate change alters phenological relations between interacting species. We might expect the historical baseline, or starting-point, for such effects to be precise synchrony between the season at which a consumer most requires food and the time when its resources are most available. We synthesize evidence that synchrony was not the historical condition in(More)
This paper describes a novel method of measuring host specificity and determining host rank order. As applied to oviposition behavior of the butterfly Euphydryas editha, the rank order of preference is the order in which plants become acceptable as the insect searches, while specificity is quantified in terms of the rate at which searching insects become(More)
Within a population of the butterfly Euphydryas editha that oviposits predominantly on two host species, heritable variation in postalighting oviposition preference was found. In a separate experiment, oviposition preference of adult females was found to be correlated with offspring performance (growth). There was a significant tendency for offspring to(More)
The California drought of 1975–77 has been correlated with unusual size changes in populations of two species of Euphydryas butterflies. Several populations became extinct, some were dramatically reduced, others remained stable and at least one increased. These differences in population dynamic response are not concordant with predictions made earlier that(More)
There is increasing pressure from policymakers for ecologists to generate more detailed 'attribution' analyses aimed at quantitatively estimating relative contributions of different driving forces, including anthropogenic climate change (ACC), to observed biological changes. Here, we argue that this approach is not productive for ecological studies. Global(More)