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| Calil,Patrícia; Rocha,Rosana M. da; Freire,Carolina A.; Roper,James J.. |
| Populations of Asterina stellifera Möbius, 1859 are declining in southern Brazil and today the species is on the Brazilian list of endangered species. Here we experimentally investigate the ecological role played by A. stellifera as a predator on the rocky substrate community by increasing densities of this species. Starfish taken from other, nearby, locations were added to three replicate plots and their density was maintained every 15 days. None of the total of 32 species that were identified in the encrusting community appeared to be influenced by the experiment. Two species, the barnacle Chthamalus bisinuatus Pilsbry, 1916 and the algae Gracilaria verrucosa (Hudson), showed small apparent responses to predation. We found that A. stellifera only exerts... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Experiment; Predation; Rocky coast; Starfish. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000200010 |
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| Mageski,Marcio; Ferreira,Rodrigo B.; Jesus,Paulo R.; Costa,Larissa C. da; Roper,James J.; Ferreira,Paulo D.. |
| ABSTRACT The island rule suggests that, when mainland animals are isolated on islands, large animals tend to become smaller, while small animals tend to become larger. A small frog in eastern Brazil, Phyllodytes luteolus (Wied-Neuwied, 1824), is widely distributed in association with bromeliads. At the end of the last glaciation, parts of the mainland became islands due to rising sea levels, thereby isolating frog populations on these islands. If the island rule holds, we predicted that frogs on islands would tend to be larger than frogs on the mainland. We compared sizes (weight and length) of 30 randomly selected male frogs from the mainland with 30 from an island in the state of Espírito Santo, Brazil. We also sampled population density on the island... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bromeliad; Amphibian; Anuran; Bromeligenous. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702015000500329 |
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| Sari,Lisiane Taiatella; Ribeiro-Costa,Cibele Stramare; Roper,James J.. |
| Senna multijuga (Rich.) H. S. Irwin & Barneby (Caesalpinaceae) é uma planta ornamental comum no sudeste do Brasil, suscetível ao dano por bruquíneos predadores de sementes. Com o objetivo de identificar os predadores de suas sementes e determinar seus ciclos populacionais, frutos de cinco árvores foram coletados em 2000 e 2001 e acondicionados em casa de vegetação até a emergência de adultos. Os bruquíneos foram identificados como Sennius crudelis Ribeiro-Costa & Reynaud, 1998, S. puncticollis (Fåhraeus, 1839) e S. nappi Ribeiro-Costa & Reynaud, 1998. Sennius crudelis foi a espécie mais abundante em 2000, seguida por S. puncticollis e S. nappi. Em 2001, Sennius crudelis foi seguida por S. nappi e S. puncticollis. Diferenças foram... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bruchinae; Dinâmica populacional; Predadores de sementes; Sennius. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752005000100019 |
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