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Insect herbivory on mangrove leaves in Guadeloupe: effects on biomass and mineral content

  • E. Saur
  • D. Imbert
  • J. Etienne
  • D. Mian
Conference paper
Part of the Developments in Hydrobiology book series (DIHY, volume 145)

Abstract

Extensive defoliation of Avicennia germinans by Junonia evarete (Stoll) (Nymphalidae) and Hyblaea purea (Cramer) (Hyblaeidae) was noted following hurricanes Hugo (1989), Luis & Marilyn (1995). The proposed work is about evaluating the direct loss of organic matter and minerals by insect grazing during an inter-hurricane period. The physiological response of the plant was assessed on perforated leaves over a 3 week period. A. germinans in two contrasted sites exhibited a leaf area loss close to 4.5% which corresponds to 50 kg D.W. / ha. In a third site, the low consumption rate of about 0.83% could be related to a drop in the insect population following an earlier outbreack and full tree defoliation. Damage in R. mangle was exceptionally low (0.2%). Bulk minerals trapped in the folivore pathway was about 1.2 kg N and 60 g P / ha in A. germinans stands. Leaf grazing brings a significant accumulation of organic matter and minerals by importing compounds from other tissues of the plant. This reflects a sudden change in leaf metabolism and we may hypothesise scarring reaction and/or secondary compound accumulation. In any case, leaf grazing demands additional energy and minerals to maintain partially grazed leaves. Moreover, such leaves are susceptible to greater loss in the event of repeated insect damage, due to higher concentrations. From these results, it appears that physiological effects of insect grazing have to be considered not only as direct loss in living tissues but also as deep changes in internal fluxes of the carbon and minerals.

Keywords

mangrove ecosystems defoliation mineral cycling Avicennia germinans Rhizophora mangle Junonia evarete Hyblaea purea French West Indies 

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Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • E. Saur
    • 1
  • D. Imbert
    • 1
  • J. Etienne
    • 2
  • D. Mian
    • 1
  1. 1.Biologie et physiologie végétalesUniversité des Antilles et de la GuyanePointe-à-Pitre, CEDEX, Guadeloupe, Antilles françaisesFrance
  2. 2.Institut National de la Recherche AgronomiquePointe-à-Pitre, CEDEX, Guadeloupe, Antilles françaisesFrance

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