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1.
Zoologia (Curitiba) ; 31(3): 245-255, June 2014. tab, ilus, graf
Artigo em Inglês | VETINDEX | ID: vti-31029

Resumo

Community-level network studies suggest that seed dispersal networks may share some universal properties with other complex systems. However, most of the datasets used so far in those studies have been strongly biased towards temperate birds, including not only dispersers, but also seed predators. Recent evidence from multi-taxon networks suggests that seed dispersal networks are not all alike and may be more complex than previously thought. Here, we used network theory to evaluate seed dispersal in a strongly impacted Atlantic Forest fragment in northeastern Brazil, where bats and birds are the only extant dispersers. We hypothesized that the seed dispersal network should be more modular then nested, and that the dispersers should segregate their services according to dispersal syndromes. Furthermore, we predicted that bat and bird species that are more specialized in frugivory would be more important for maintaining the network structure. The mixed network contained 56 plant species, 12 bat species, and eight bird species, and its structure was more modular (M = 0.58) then nested (NODF = 0.21) compared with another multi-taxon network and 21 single-taxon networks (with either bats or birds). All dispersed fruits had seeds smaller than 9 mm. Bats dispersed mainly green fruits, whereas birds dispersed fruits of various colors. The network contained eight modules: five with birds only, two with bats only, and one mixed. Most dispersers were peripheral, and only specialized frugivores acted as hubs or connectors. Our results strongly support recent studies, suggesting that seed dispersal networks are complex mosaics, where different taxa form separate modules with different properties, which in turn play complementary roles in the maintenance of the associated ecosystem functions and services.(AU)


Assuntos
Animais , Dispersão de Sementes , Aves/fisiologia , Quirópteros/fisiologia , Biodiversidade , Brasil
2.
Zoologia (Curitiba, Impr.) ; 31(3): 245-255, June 2014. tab, ilus, graf
Artigo em Inglês | VETINDEX | ID: biblio-1504252

Resumo

Community-level network studies suggest that seed dispersal networks may share some universal properties with other complex systems. However, most of the datasets used so far in those studies have been strongly biased towards temperate birds, including not only dispersers, but also seed predators. Recent evidence from multi-taxon networks suggests that seed dispersal networks are not all alike and may be more complex than previously thought. Here, we used network theory to evaluate seed dispersal in a strongly impacted Atlantic Forest fragment in northeastern Brazil, where bats and birds are the only extant dispersers. We hypothesized that the seed dispersal network should be more modular then nested, and that the dispersers should segregate their services according to dispersal syndromes. Furthermore, we predicted that bat and bird species that are more specialized in frugivory would be more important for maintaining the network structure. The mixed network contained 56 plant species, 12 bat species, and eight bird species, and its structure was more modular (M = 0.58) then nested (NODF = 0.21) compared with another multi-taxon network and 21 single-taxon networks (with either bats or birds). All dispersed fruits had seeds smaller than 9 mm. Bats dispersed mainly green fruits, whereas birds dispersed fruits of various colors. The network contained eight modules: five with birds only, two with bats only, and one mixed. Most dispersers were peripheral, and only specialized frugivores acted as hubs or connectors. Our results strongly support recent studies, suggesting that seed dispersal networks are complex mosaics, where different taxa form separate modules with different properties, which in turn play complementary roles in the maintenance of the associated ecosystem functions and services.


Assuntos
Animais , Aves/fisiologia , Biodiversidade , Dispersão de Sementes , Quirópteros/fisiologia , Brasil
3.
Chiropt. Neotrop. (Impr.) ; 19(3): 31-35, 2013.
Artigo em Inglês | VETINDEX | ID: biblio-1472007

Resumo

Todays biology is marked by a conflict of approaches due to changes in the way scientific knowledge is produced. Bat research is no exception, and colleagues from different schools struggle with each other in conferences and journals because some stand for old-fashioned, organism-oriented research, while others wholeheartedly defend modern, theory-oriented approaches. From some grand masters, especially Elisabeth Kalko and Adriano Peracchi, I learned that this is a false dilemma: we do not need to choose between one view and the other, but rather can combine them. In this article, I make the case for this integration, aiming at a productive agreement in the chiropterological world.


Assuntos
Animais , Biologia/história , Biologia/métodos , Métodos , Quirópteros , Filosofia
4.
Chiropt. neotrop. ; 19(3): 31-35, 2013.
Artigo em Inglês | VETINDEX | ID: vti-13533

Resumo

Todays biology is marked by a conflict of approaches due to changes in the way scientific knowledge is produced. Bat research is no exception, and colleagues from different schools struggle with each other in conferences and journals because some stand for old-fashioned, organism-oriented research, while others wholeheartedly defend modern, theory-oriented approaches. From some grand masters, especially Elisabeth Kalko and Adriano Peracchi, I learned that this is a false dilemma: we do not need to choose between one view and the other, but rather can combine them. In this article, I make the case for this integration, aiming at a productive agreement in the chiropterological world.(AU)


Assuntos
Animais , Quirópteros , Métodos , Biologia/história , Biologia/métodos , /métodos , Filosofia
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