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| Registros recuperados: 10 | |
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| Larsen,Ole N.. |
| A bird needs to keep track not only of social interactions of conspecifics but also of their changing locations in space by determining their directions and distances. Current knowledge of accuracy in the computation of sound source location by birds is still insufficient, partly because physiological mechanisms of few species are studied in well defined laboratory settings, while field studies are performed in a variety of species and complex environments. Velocity gradients and reverberating surfaces may conceivably induce inaccuracy in sound source location (mainly elevation) by distorting the directional cues. However, most birds possess an inherently directional pressure difference receiver, which enhances the directional cues (mainly azimuth), and a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Directional hearing; Elevation; Azimuth angle; Precedence effect. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200013 |
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| QUIROZ,CONSTANZA L; BADANO,ERNESTO I; CAVIERES,LOHENGRIN A. |
| It is well known that the number of plant species associated with nurse plants increases with elevation. However, studies conducted so far have largely ignored the effect of nurse plants on other community attributes, such as the species abundances, diversity and evenness. Moreover, changes in these community attributes along environmental gradients have also been seldom examined. The present study evaluates the effect of the cushion plant Azorella madrepórica (Apiaceae) on species richness, species abundance, diversity and evenness of vascular plants at two elevations in the Andes of central Chile. Theoretically, the impact of this nurse cushion plant on these community attributes should be grater at a higher elevation. Results showed that the proportion... |
| Tipo: Journal article |
Palavras-chave: Positive associations; Community structure; Elevation; Environmental gradients; Nurse effect. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000200001 |
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| Moreno-Ramírez,Yolanda del Rocio; Hernández-Bautista,Aurelio; Ramírez-Vallejo,Porfirio; Castillo-Gónzalez,Fernando; Rocandio-Rodríguez,Mario; Vanoye-Eligio,Venancio; Mora-Ravelo,Sandra Grisell. |
| ABSTRACT: In the present study, we investigated the influence of social and environmental factors in the genetic diversity of tomato landraces in the South-Central region of Mexico. A total of 30 tomato landraces, collected in 18 villages with different ethnolinguistic affiliations, were analyzed. We reported that the genetic diversity of tomato landraces is associated with the ethnolinguistic group, weather, and soil-type present in the region studied. Our results showed that there are morphological differences between landraces grown by different ethnolinguistic groups; however, there was also evidence of morphological similarities between landraces from groups with different ethnolinguistic affiliations. Finally, different selection criteria, mainly... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ethnolinguistic diversity; Native populations; Weather; Elevation; Soil.. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000500200 |
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| Registros recuperados: 10 | |
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