Banca de DEFESA: ADRIANO SOARES MOTA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ADRIANO SOARES MOTA
DATA : 28/03/2019
HORA: 14:00
LOCAL: Sala de reuniões - DECOL
TÍTULO:

 

EFFECTS OF HABITAT IDENTITY AND DIVERSITY ON LITTER DIVERSITY-DECOMPOSITION RELATIONSHIP

PALAVRAS-CHAVES:

DECOMPOSITION, ECOSYSTEMS FUNCTIONING, FUNCTIONAL DIFFERENCE, INTERACTION BETWEEN HABITATS, COMPLEMENTARITY EFFECTS

PÁGINAS: 38
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
RESUMO:

A growing number of empirical evidences have pointed to the importance of the litter diversity as mediating factor of the decomposition process in terrestrial ecosystems. At the same time, studies have shown that both identity and habitat diversity can also interfere in the dynamics of determinants of ecosystem processes, such as decomposition. However, little is known, whether and how factors such as habitat identity and diversity operate individually and interactively to the effects of the litter diversity on decomposition. In a restinga forest located in the northeastern coast, we evaluated experimentally over 8 months, if and how the effects of the litter diversity on decomposition varied according to the identity and diversity of habitats, as well as the occurrence of non-additive effects diversity of individual habitats. For this, a functional diversity gradient of litter was established through the allocation of detritus of five local tree species in microcosms formed by monocultures and all possible combinations of two species, totaling 15 different compositions (5 monocultures + 10 mixtures). This experimental design was replicated orthogonally along two levels of identity (i.e., above and belowground) and diversity (i.e. presence or absence of adjacent habitat) of habitats. The results showed that the litter richness explained most of the variation in the decomposition process, but that its effects were also significantly mediated by habitat identity, and for most species the litter diversity exerted an effect habitat above the ground. Habitat diversity did not have a significant effect on the decomposition process either individually or interactively with the litter diversity. In addition, functional diversity also did not affect decomposition in a systematic way in any type of habitat and also did not interact with the diversity of habitats. Our results demonstrate that particular characteristics of soil habitats can mediate the effects of the litter diversity on decomposition. However, these effects seem to occur independently of each habitat type (i.e., absence of interactive effects between habitats). In addition, the lack of effects of functional diversity confirms the results of recent studies in the literature that characteristics of functional identity (i.e., interactions between particular functional traits of the community) are more prevalent than systematic effects of the functional diversity of litter on decomposition.

MEMBROS DA BANCA:
Presidente - 1714892 - ADRIANO CALIMAN FERREIRA DA SILVA
Interno - 1837921 - ALEXANDRE FADIGAS DE SOUZA
Externo à Instituição - JOSÉ LUIZ ALVES SILVA