Use este identificador para citar ou linkar para este item:
http://hdl.handle.net/1843/BUOS-9TPF4Z
Tipo: | Tese de Doutorado |
Título: | Biossistemática, filogeografia, estrutura microespacial e dinâmica populacional do complexo Melocactus oreas (Cactaceae) no Brasil |
Autor(es): | Frederic Mendes Hughes |
Primeiro Orientador: | Eduardo Leite Borba |
Primeiro Coorientador: | Claudia Maria Jacobi |
Abstract: | Associations between plants and substrate in drylands enhance the ability of nutrient pools buildup and seedling establishment. However, this relationship has not been extensively demonstrated in populations of lithophytic plants. We report the effects of microrelief and neighboring plants on the population structure of Melocactus species in the semiarid region of northeastern Brazil. The size classes of five populations and the seedling fate in two populations were examined through point pattern analysis. Association patterns between size classes were positive between seedlings and adults in all the populations. Cohorts were positively related to rainfall (> 60%). Recruitment events were microhabitat-dependent and showed high mortality levels (> 70%). The spatio-temporal decoupling between seedling fate and adults may favor population dynamics changes under rainfall uncertainty. Based on our analyses, we suggest that the relationship among size classes, microhabitat and rainfall in lithophytic populations of Melocactus is crucial to buffer negative effects of environmental severity in seedling recruitment and survival. |
Assunto: | Ecologia |
Idioma: | Inglês |
Editor: | Universidade Federal de Minas Gerais |
Sigla da Instituição: | UFMG |
Tipo de Acesso: | Acesso Aberto |
URI: | http://hdl.handle.net/1843/BUOS-9TPF4Z |
Data do documento: | 22-Ago-2014 |
Aparece nas coleções: | Teses de Doutorado |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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hughes_et_al._all.pdf | 5.29 MB | Adobe PDF | Visualizar/Abrir |
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