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Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/122681
Título

Developmental Instability and Fitness in Periploca laevigata Experiencing Grazing Disturbance

AutorAlados, Concepción L. ; Giner, M. L.; Dehesa, Luisa ; Escós, J. ; Barroso, F. G.; Emlen, J. M.; Freeman, D. C.
Palabras clavedevelopmental instability
growth rhythm
grazing disturbance
Fecha de publicación2002
EditorUniversity of Chicago Press
CitaciónInternational Journal of Plant Sciences 163(6): 969-978 (2002)
ResumenWe investigated the sensitivity of developmental instability measurements (leaf fluctuating asymmetry, floral radial asymmetry, and shoot translational asymmetry) to a long‐standing natural stress (grazing) in a palatable tannin‐producing shrub (Periploca laevigata Aiton). We also assessed the relationship between these measures of developmental instability and fitness components (growth and floral production). Developmental instability, measured by translational asymmetry, was the most accurate estimator of a plant’s condition and, consequently, environmental stress. Plants with less translational asymmetry grew more and produced more flowers. Plants from the medium‐grazed population were developmentally more stable, as estimated by translational and floral asymmetry, than either more heavily or more lightly grazed populations. Leaf fluctuating asymmetry was positively correlated with tannin concentration. The pattern of internode growth also responded to grazing impact. Plants under medium to heavy grazing pressure accelerated early growth and consequently escaped herbivory later in the season, i.e., at the beginning of the spring, when grazing activity was concentrated in herbaceous plants. Periploca laevigata accelerated growth and finished growing sooner than in the other grazing treatment. Thus, its annual growth was more mature and less palatable later in the season when grazers typically concentrate on shrubs. The reduction of developmental instability under medium grazing is interpreted as a direct effect of grazing and not as the release from competition.
Descripción10 páginas, 4 figuras, 4 tablas.
Versión del editorhttp://dx.doi.org/10.1016/j.palaeo.2015.06.030
URIhttp://hdl.handle.net/10261/122681
DOI10.1086/342630
ISSN1058-5893
E-ISSN1537-5315
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