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Publicação
Efeitos das limpezas do subcoberto nas comunidades de aves florestais mediterrânicas
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Resumo(s)
The increased usage of mechanical understorey clearing in Mediterranean forests to reduce
fire risk has consequences on biological communities that are poorly known. This issue was
addressed using a chronosequence of 48 Quercus suber forest stands in southern Portugal,
to estimate how vegetation and bird assemblages attributes change following clearing over
about 70 years. This study showed that understorey clearing has long-lasting effects on
vegetation structure and composition, as well as on bird assemblages, that lasted for at least
40-50 years. Recovery of tree richness lasted about 50 years. Shrubs started recovering
immediately after clearing, with pioneer seeder species dominating understorey vegetation
for about 20 years. Resprouter species recovered slowly for about 40-50 years. Both
breeding and wintering bird assemblages were affected by clearing, with particularly strong
effects on insectivorous and frugivorous species, mostly those associated with shrubs and
trees. Results were stronger during winter when frugivores distribution appeared influenced
by fruit tracking in old understorey forests. Vertical heterogeneity in old understorey stands
was likely to be the key factor affecting bird distribution during spring. Management
strategies for reducing fire risk should strive to maintain some stands with understorey older
than about 50 years in order to conserve biodiversity repositories.
Descrição
Mestrado em Gestão de Recursos Naturais - Instituto Superior de Agronomia
Palavras-chave
cork oak forests fire risk forest management vegetation recover fruit tracking mosaic system sobreirais risco de incêndio gestão florestal recuperação da vegetação frugivoros sistema em mosaico