Data/hora: 27/07/2024 02:49:29

Biblioteca(s): 	Embrapa Florestas.	
Data corrente: 	06/01/2015	
Data da última atualização: 	27/04/2015	
Autoria: 	MANZAN, M. F.; FAJARDO, C. G.; VIEIRA, F. de A.	
Afiliação: 	Maira Fontes Manzan, Universidade Federal do Rio Grande do Norte; Cristiane Gouvêa Fajardo, Universidade Federal do Rio Grande do Norte; Fábio de Almeida Vieira, Universidade Federal do Rio Grande do Norte.	
Título: 	Spatial pattern analysis and demography of two tropical trees in the Brazilian Caatinga.	
Ano de publicação: 	2014	
Fonte/Imprenta: 	Pesquisa Florestal Brasileira, Colombo, v. 34, n. 80, p. 331-336, out./dez. 2014.	
DOI: 	10.4336/2014.pfb.34.80.634	
Idioma: 	Inglês	
Conteúdo: 	Aspidosperma pyrifolium (Apocynaceae) and Caesalpinia pyramidalis (Fabaceae) share the same habitat in the Brazilian Caatinga domain. In this paper, we investigate the intra and inter-species interactions between these two plants using spatial pattern analysis among cohorts. The results showed that the adult trees of each species present higher densities at distances shorter than 9 m to 12 m. However, due to seed dispersal via autochory, we expected a more aggregate density for C. pyramidalis than A. pyrifolium as the later disperses seeds through anemochory. Difference in spatial aggregation among cohorts was not observed and therefore the results contradict the expectations of the Janzen-Connell hypothesis. It is likely that this is associated with anthropogenic factors in the past such as fire, animal husbandry and logging. Using a bivariate analysis of the neighborhood density, we also confirmed the significant coexistence between the two species. This coexistence could be explained by the process of positive interspecific interactions, such as facilitation, which is common in semi-arid regions under stressful conditions.	
Palavras-Chave: 	Coexistência de plantas; Cohorts; Coortes; Padrão espacial; Plant coexistence; Spatial patterning.	
Thesagro: 	Aspidosperma Pyrifolium; Caesalpinia Pyramidalis.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/122872/1/Spatial.pdf	
Registro original: 	Embrapa Florestas (CNPF)	
Exemplares: 	CNPF - (53174-1) - UPE - AP - DD -  -  -  - DIS