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Exp Gerontol. 2017 Sep;95:107-115. doi: 10.1016/j.exger.2017.05.008. Epub 2017 May 11.

Latitudinal and age-specific patterns of larval mortality in the damselfly Lestes sponsa: Senescence before maturity?

Author information

1
Laboratory of Evolutionary Biodemography, Max Planck Institute for Demographic Research, Konrad-Zuse-Strasse 1, 18057 Rostock, Germany. Electronic address: danko@demogr.mpg.de.
2
Laboratory of Evolutionary Biodemography, Max Planck Institute for Demographic Research, Konrad-Zuse-Strasse 1, 18057 Rostock, Germany.
3
Department of Ecosystem Conservation, Institute of Nature Conservation, Polish Academy of Sciences, al. Mickiewicza 33, PL-31-120 Krakow, Poland.
4
Laboratory of Aquatic Ecology, Evolution and Conservation, Charles Deberiotstraat 32, University of Leuven, Belgium.
5
Department of Ecosystem Conservation, Institute of Nature Conservation, Polish Academy of Sciences, al. Mickiewicza 33, PL-31-120 Krakow, Poland. Electronic address: sniegula@iop.krakow.pl.

Abstract

Latitudinal differences in life history traits driven by differences in seasonal time constraints have been widely documented. Yet, latitudinal patterns in (age-specific) mortality rates have been poorly studied. Here, we studied latitudinal differences in pre-adult age-specific mortality patterns in the strictly univoltine damselfly Lestes sponsa. We compared individuals from three latitudes reared from the egg stage in the laboratory at temperatures and photoperiods simulating those at the latitude of origin (main experiment) and under common-garden conditions at a fixed temperature and photoperiod (supplementary experiment). Results from the main experiment showed that the high-latitude population exhibited higher mortality rates than the central and southern populations, likely reflecting a cost of their faster development. Age-specific mortality patterns, also indicated higher ageing rates in the high-latitude compared to the low-latitude population, which likely had a genetic basis. The strong within-population variation in hatching dates in the low-latitude population caused variation in mortality rates; individuals that hatched later showed higher mortality rates presumably due to their shorter development times compared to larvae that hatched earlier. In both experiments, larvae from all three latitudes showed accelerated mortality rates with age, which is consistent with a pattern of senescence before adulthood.

KEYWORDS:

Ageing; Emergence; Latitude; Photoperiod; Seasonal time constraint; Senescence; Temperature

PMID:
28502774
DOI:
10.1016/j.exger.2017.05.008
[Indexed for MEDLINE]
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