Paper| Year: | 2020 |
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| Author(s): | Andreu. Rotger, José-Manuel. Igual, G. Tavecchia |
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| Title: | Contrasting size-dependent life history strategies of an insular lizard |
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| Journal: | Current Zoology |
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| ISSN: | 1674-5507 |
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| Volume: | zoaa019 |
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| Issue No.: | 1 |
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| Pages: | 1 |
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| D.O.I.: | https://doi.org/10.1093/cz/zoaa019 |
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| Web: | https://academic.oup.com/cz/article/doi/10.1093/cz/zoaa019/5821420? |
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| Abstract: | In many species with continuous growth, body size is an important driver
of life-history tactics and its relative importance is thought to
reflect the spatio-temporal variability of selective pressures. We
developed a deterministic size-dependent integral projection model (IPM)
for three insular neighbouring lizard populations with contrasting
adult body sizes to investigate how size-related selective pressures can
influence lizard life-history tactics. For each population, we broke
down differences in population growth rates into contributions from
size-dependent body growth, survival, and fecundity. A life table
response experiment (LTRE) was used to compare the population dynamics
of the three populations and quantify the contributions of intrinsic
demographic coefficients of each population to the population growth
rate (λ). Perturbation analyses revealed that the largest adults
contributed the most to the population growth rate, but this was not
true in the population with the smallest adults and size-independent
fertility. Although we were not able to identify a single factor
responsible for this difference, the combination of the demographic
model on a continuous trait coupled with a life table response
experiment analysis revealed how sister populations of the same species
follow different life strategies and showed different compensatory
mechanisms among survival, individual body growth and fertility. Our
results indicate that body size can play a contrasting role even in
closely related and closely spaced populations. |
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Related staffGiacomo TavecchiaJose Manuel Igual GómezRelated departmentsField EcologyAnimal and Microbial BiodiversityRelated projectsRESET CTA 161Related research groupsEcology and Evolution
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