-(Floristic composition of the vascular species and tree flora successional character in a Seasonal Semideciduous Forest remnant in Southern Brazil). The floristic composition of vascular species present in an urban forest remnant in the Ibiporã Forest Park (23°15'71" S and 51°01'83" W, Park entrance), Southern Brazil, was studied from May 2006 to May 2008. The species were divided in life form and tree species were placed in successional categories. A total of 176 native species, 147 genera and 57 families were found. The majority of species were Angiosperms (98%) while 2% were Pteridophyta. The richest families were Fabaceae (19), Bignoniaceae, Malvaceae (nine), Meliaceae and Rubiaceae (eight). The tree species were majority (53%), following by herbaceous (16%), vines (14%), shrubs (13%) and epiphyte species (4%). The successional characterization of the tree species showed a slight predominance of the late secondary species (52%) over species of early succession (45%) IntroduçãoA fragmentação das florestas reduz a área de cobertura total e promove alterações no ambiente florestal, podendo resultar na extinção imediata de algumas espécies e, ao longo do tempo, expõe os organismos sobreviventes aos efeitos do ambiente alterado, o que se tem denominado de efeito de borda (Murcia 1995). A resposta das espécies é variável, porém alterações na sobrevivência, na estrutura e na distribuição das espécies na comunidade contribuem para a perda da diversidade biológica, tanto diretamente pela redução do estoque de genes e de espécies, como indiretamente, em consequência da quebra das interações ecológicas e da estabilidade dos ecossistemas (Futuyma 1996). O conhecimento da flora e da fauna constitui o ponto de partida para o acompanhamento das alterações temporais que podem orientar ações de manejo das unidades de conservação.Na região norte do Estado do Paraná, o processo de ocupação com a lavoura cafeeira a partir da década de 40 gerou um intenso processo de fragmentação da floresta original, restando atualmente vários fragmentos pequenos e isolados (Campos & Costa Filho 2006
Biological invasions are one of the great threats of our time, and the accumulation of knowledge of invasive species is essential for invasive species management. In this study, aspects of the population ecology of Leucaena leucocephala (Lam) de Wit were investigated in a seasonal semi-deciduous forest remnant (23°15ʹ28ʹʹS, 51°01ʹ52ʹʹW – centre of the remnant) in Southern Brazil to evaluate whether the species is invading the remnant. In the first season, 1974 individuals, distributed heterogeneously in the remnant, were sampled. The population height structure fitted a negative exponential growth curve function (r2 = 0.9), indicating that the population was persisting through recruitment. The population also had a grouped spatial pattern and high recruitment rate. The species invaded the disturbed areas of the remnant. Gradual eradication is recommended for L. leucocephala for the remnant.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
334 Leonard St
Brooklyn, NY 11211
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.