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Seasonal patterns of herbivory, leaf traits and productivity consumption in dry and wet Patagonian forests

Authors

  • NOEMÍ MAZÍA,

    Corresponding author
    1. Departamento de Producción Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina
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  • ENRIQUE J. CHANETON,

    1. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agronomía, Consejo Nacional de Investigaciones Científicas y Técnicas (IFEVA-CONICET), Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina
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  • CRISTINA DELLACANONICA,

    1. Departamento de Producción Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina
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  • LUCIANO DIPAOLO,

    1. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agronomía, Consejo Nacional de Investigaciones Científicas y Técnicas (IFEVA-CONICET), Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina
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  • THOMAS KITZBERGER

    1. Instituto de Investigaciones en Biodiversidad y Medioambiente (INIBIOMA-CONICET), Laboratorio Ecotono, Universidad Nacional del Comahue, Bariloche, Argentina
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Noemí Mazía, Departamento de Producción Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453, 1417 Buenos Aires, Argentina. E-mail: cmazia@agro.uba.ar

Abstract

1. Endemic herbivory can influence forest ecosystem function, but how annual productivity consumption relates to seasonal resource utilisation by folivore guilds remains poorly understood.

2. Monthly changes in leaf damage and foliage traits were monitored in ‘dry’ and ‘wet’Nothofagus pumilio (Fagales: Nothofagaceae) deciduous forests in northern Patagonia, Argentina. Herbivore-induced leaf abscission was assessed and foliar productivity consumption was measured in the canopy and in litterfall harvests.

3. Seasonal damage ranged from 8% to 32% in dry forest, but remained below 5% in wet forest although foliar quality was higher in the latter. In dry forest, dominant guilds were temporally separated; leaf miners consumed younger foliage in spring to early summer, whereas leaf tiers prevailed in late summer to autumn. In wet forest, damage created by external chewers was concentrated in early summer.

4. Insect damage induced premature leaf abscission, especially in dry forest. Although foliar production in wet forest doubled that in dry forest, the percentage of productivity lost to folivores was higher in dry (14–20%) than in wet (1.2–1.8%) forest.

5. The overall greater impact of herbivory in dry forest canopies countered the expectation that consumption would increase with plant productivity and nutritional quality. Lower temperatures and a shorter growing season are likely to constrain folivory in wet forest stands.

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