The growth strategy of an alpine beetle: maximization or individual growth adjustment in relation to seasonal time horizons?

Margraf, Nicolas; Gotthard, Karl; Rahier, Martine

doi:10.1046/j.1365-2435.2003.00775.x

Cited by 37 publications

(35 citation statements)

References 15 publications

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“…Therefore, trade-offs among development, growth rate, size and other traits integrate the specific value of time, against a background of resource availability and allocation. Moreover, despite its demographic value, growth rate is not routinely maximized (Margraf et al, 2003;Tammaru et al, 2004), unlike some earlier expectations, so that individuals retain room for manoeuvre in responding to environmental circumstances.…”

Section: Trade-offs and Developmental Plasticitymentioning

confidence: 89%

Key themes in the study of seasonal adaptations in insects II. Life-cycle patterns

Danks

2006

Appl. Entomol. Zool.

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Recent work on selected topics of particular interest for understanding insect life-cycles is reviewed, including habitat patterns, kinds of variation, the spreading of risk and prolonged diapause, trade-offs and developmental plasticity, circannual rhythms, the concept of life cycles as developmental choices, and development or delay as the default response. Seasonal adaptations have a wider range of components than has often been appreciated. Variation in lifecycle traits, including the duration of development and the timing of emergence, can be wide, narrow, or discontinuous. Trade-offs encompass multiple simultaneous traits and are not always structured as might be expected. Diapause, cold hardiness, reproductive pattern, and other traits have evolved many times independently. Such complex interactions can be understood only by examining the detailed features of a species' habitat, because how developmental decisions are made and whether continuous development or delays are programmed reflect the predictability of habitats and the environmental signals they supply. Ecological context is important, not just mechanisms of adaptation. Therefore, although most previous studies have paid more attention to insect response than to habitat, interpreting the seasonal relevance of life-cycle patterns requires measurement and analysis for individual species of habitat characteristics and their variation, on a range of temporal and spatial scales, in much more detail than has been customary.

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Section: Trade-offs and Developmental Plasticitymentioning

confidence: 89%

Key themes in the study of seasonal adaptations in insects II. Life-cycle patterns

Danks

2006

Appl. Entomol. Zool.

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“…This species is adapted to survival at high altitudes, with isolated populations found across the Alps and Apennines at altitudes of 1200-2500 m above sea level (Margraf et al, 2003Röder et al, 2008). Seven allopatric subspecies have been described based on differentiation of male genitalia (the aedeagus) and cuticle microstructure (Ruffo, 1946;Franz, 1949;Ruffo, 1976, 1986).…”

Section: Introductionmentioning

confidence: 99%

The phylogeography of an alpine leaf beetle: Divergence within Oreina elongata spans several ice ages

Borer

Alvarez

Buerki

et al. 2010

Molecular Phylogenetics and Evolution

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a b s t r a c tThe genetic landscape of the European flora and fauna was shaped by the ebb and flow of populations with the shifting ice during Quaternary climate cycles. While this has been well demonstrated for lowland species, less is known about high altitude taxa. Here we analyze the phylogeography of the leaf beetle Oreina elongata from 20 populations across the Alps and Apennines. Three mitochondrial and one nuclear region were sequenced in 64 individuals. Within an mtDNA phylogeny, three of seven subspecies are monophyletic. The species is chemically defended and aposematic, with green and blue forms showing geographic variation and unexpected within-population polymorphism. These warning colors show pronounced east-west geographical structure in distribution, but the phylogeography suggests repeated origin and loss. Basal clades come from the central Alps. Ancestors of other clades probably survived across northern Italy and the northern Adriatic, before separation of eastern, southern and western populations and rapid spread through the western Alps. After reviewing calibrated gene-specific substitution rates in the literature, we use partitioned Bayesian coalescent analysis to date our phylogeography. The major clades diverged long before the last glacial maximum, suggesting that O. elongata persisted many glacial cycles within or at the edges of the Alps and Apennines. When analyzing additional barcoding pairwise distances, we find strong evidence to consider O. elongata as a species complex rather than a single species.

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“…When confronted with such seasonal time constraints, free-living organisms with complex life cycles are often able to increase their growth rate and/or decrease their transitional size so as to switch habitats before conditions deteriorate (e.g. Leimar, 1996 ;Johansson and Rowe, 1999 ;Margraf et al 2003). Seasonal time constraints are also common in parasite life cycles.…”

Section: Introductionmentioning

confidence: 99%

Seasonal changes in host phenotype manipulation by an acanthocephalan: time to be transmitted?

et al. 2008

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Many complex life cycle parasites exhibit seasonal transmission between hosts. Expression of parasite traits related to transmission, such as the manipulation of host phenotype, may peak in seasons when transmission is optimal. The acanthocephalan Acanthocephalus lucii is primarily transmitted to its fish definitive host in spring. We assessed whether the parasitic alteration of 2 traits (hiding behaviour and coloration) in the isopod intermediate host was more pronounced at this time of year. Refuge use by infected isopods was lower, relative to uninfected isopods, in spring than in summer or fall. Infected isopods had darker abdomens than uninfected isopods, but this difference did not vary between seasons. The level of host alteration was unaffected by exposing isopods to different light and temperature regimes. In a group of infected isopods kept at 4 xC, refuge use decreased from November to May, indicating that reduced hiding in spring develops during winter. Keeping isopods at 16 xC instead of 4 xC resulted in higher mortality but not accelerated changes in host behaviour. Our results suggest that changes in host and/or parasite age, not environmental conditions, underlie the seasonal alteration of host behaviour, but further work is necessary to determine if this is an adaptive parasite strategy to be transmitted in a particular season.

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The growth strategy of an alpine beetle: maximization or individual growth adjustment in relation to seasonal time horizons?

Cited by 37 publications

References 15 publications

Key themes in the study of seasonal adaptations in insects II. Life-cycle patterns

Key themes in the study of seasonal adaptations in insects II. Life-cycle patterns

The phylogeography of an alpine leaf beetle: Divergence within Oreina elongata spans several ice ages

Seasonal changes in host phenotype manipulation by an acanthocephalan: time to be transmitted?

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