Data/hora: 10/06/2024 06:42:17

Provedor de dados: | 39
País: | Brazil
Título: | Reproductive phenology, seed removal and early regeneration in relation to distance from parental plants of a native palm in small Atlantic forest fragments
Autores: | Mariano,Vanessa; Christianini,Alexander V.
Data: | 2016-06-01
Ano: | 2016
Palavras-chave: | Brazilian Atlantic Forest; Crop size; Habitat fragmentation; Janzen-Connell hypothesis; Large seeds; Palms; Seed dispersal; Seed predation; Seedling survival; Syagrus romanzoffiana.
Resumo: | ABSTRACT The Brazilian Atlantic Forest is a global biodiversity hotspot, but most of what remains are small fragments. Small fragments are often harsh environments for forest plant recruitment due to edge effects and the loss of frugivorous animals that provide seed dispersal. We recorded the one-year reproductive phenology of the keystone palm Syagrus romanzoffiana in small (&lt;2.5ha) Atlantic Forest fragments in southeastern Brazil. We tested the Janzen-Connell hypothesis with seed-removal experiments and followed the five-year survival of recruits in relation to the distance from parental plants. Palms produced many fruits throughout the year (mean 2,600/plant). More seedlings were found away from parental plants than near them, thereby supporting the Janzen-Connell hypothesis. Almost 45% of seedlings alive in 2010 were dead five years later, but recruitment of new seedlings compensated for this mortality. Distance-dependent factors influenced the density of early ontogenetic stages, but had limited effects on juveniles or on seed removal. High seed production, seed dispersal provided by disturbance-tolerant frugivores and the relatively long-term survival of adults, seedlings and juveniles seem to allow the persistence of S. romanzoffiana in the forest fragments, but possibly at the cost of an increased clumped distribution and reduced gene flow at the landscape scale.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000200176
Editor: | Sociedade Botânica do Brasil
Relação: | 10.1590/0102-33062015abb0302
Formato: | text/html
Fonte: | Acta Botanica Brasilica  v.30 n.2 2016
Fonte: | info:eu-repo/semantics/openAccess