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Una Aproximación Evolutiva para Entender la Biología de las Invasiones: Adaptación Local y Genotipos de Propó‐sito General en la Hierba Verbascum thapsus
Author(s) -
Parker Ingrid M.,
Rodriguez Joseph,
Loik Michael E.
Publication year - 2003
Publication title -
conservation biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.2
H-Index - 222
eISSN - 1523-1739
pISSN - 0888-8892
DOI - 10.1046/j.1523-1739.2003.02019.x
Subject(s) - biology , adaptation (eye) , weed , range (aeronautics) , ecology , population , selection (genetic algorithm) , invasive species , local adaptation , genetic variation , demography , genetics , materials science , neuroscience , artificial intelligence , sociology , computer science , gene , composite material
The role of evolution in the invasion of non‐native species has important implications for conservation, weed science, risk assessment, and policy. In this paper we first discuss why an evolutionary perspective can be helpful and outline a range of potentially useful approaches from population biology and ecological genetics. As a case study, we then ask how adaptation and genetic structure may promote or constrain the expansion of an invasive weed, Verbascum thapsus , into high elevations in the Sierra Nevada of California. We used growth‐chamber and common‐garden experiments to assay a range of morphological and physiological traits that could influence plant fitness at high elevation. There was a significant relationship between elevation and leaf size and reflectance above 800 m, although we found no relationship between elevation and most other traits ( growth rate in warm or cool temperatures, freezing tolerance when grown in warm or cool temperatures, leaf number, rosette morphology, plant height ). We did see marked genetic differentiation among populations, possibly reflecting founder effects and a history of genetic drift. When we partitioned the phenotypic variance, there was almost no variation among maternal families within populations, limiting the potential for selection to act. The majority of the variance for all traits was among individuals within families, suggesting that environmental conditions strongly influenced the phenotype. Overall, the increasing success of V. thapsus at high elevations appears to conform more to Baker's concept of a general‐purpose genotype than to invasion by rapid adaptation.