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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Characterizing background heterogeneity in visual communication

Texto completo
Autor(es):
Camargo, Maria Gabriela G. [1] ; Cazetta, Eliana [2] ; Morellato, Leonor Patricia C. [1] ; Schaefer, H. Martin [3]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] UNESP Univ Estadual Paulista, Lab Fenol, Dept Bot, Grp Fenol & Dispersao Sementes, BR-13506900 Rio Claro, SP - Brazil
[2] Univ Estadual Santa Cruz, Dept Ciencias Biol, BR-45662900 Ilheus, BA - Brazil
[3] Univ Freiburg, Fac Biol, Dept Evolutionary Biol & Anim Ecol, D-79104 Freiburg - Germany
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: BASIC AND APPLIED ECOLOGY; v. 15, n. 4, p. 326-335, 2014.
Citações Web of Science: 2
Resumo

How is a visual signal effectively transmitted through an environment triggering a response by a perceiver? Experimental and theoretical works in disparate fields, such as sexual selection and plant animal interactions, have demonstrated selection based on signal conspicuousness. However, to properly describe the conspicuousness of a signal, it is necessary to quantify the spatial and temporal heterogeneity of background coloration of a signaler. We intend to compare the effectiveness of four methods developed to characterize background heterogeneity. To describe the background in a seasonal vegetation, we collected reflectance data in dry and wet seasons of (i) target leaves (those leaves against which a signal is predominantly displayed); (ii) overall leaves (leaves from the most common plant species in the community); (iii)frames in a limited area in space, by measuring the reflectance of all material found in the background; and (iv) background items from the most common species, based on their abundance along transects. We analyzed seasonal color changes in terms of hue, chroma and brightness and described the conspicuousness of fruit coloration according to avian vision. All methods found significant differences in the background coloration between seasons, with higher reflectance values in the dry season. Hue values were higher in the dry season, and chroma values were higher in the wet season. Only the methods most restricted in space (target leaves and frames) recorded seasonal differences in fruit conspicuousness. The transects and frames methods are useful for describing the backgrounds of non-stationary signals (i.e., those of most animals). For plant signals, which are displayed against a fixed background in space, we recommend specific sampling of target leaves. Our results support the importance of measuring the seasonal heterogeneity of the background but also indicate that a monthly sampling design is not necessary to evaluate the conspicuousness of fruit signals. (AU)

Processo FAPESP: 10/01762-3 - Padrões de frutificação e diversidade na produção, cor e composição química de frutos do cerrado: uma visão integrada
Beneficiário:Maria Gabriela Gutierrez de Camargo
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 10/52113-5 - E-fenologia: aplicação de novas tecnologias para monitorar a fenologia e mudanças climáticas nos trópicos
Beneficiário:Leonor Patricia Cerdeira Morellato
Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular
Processo FAPESP: 07/59779-6 - Estudo comparativo da diversidade e da fenologia reprodutiva e vegetativa entre borda e interior num fragmento de Cerrado em Itirapina, São Paulo
Beneficiário:Leonor Patricia Cerdeira Morellato
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 10/51307-0 - Diversidade florística e padrões sazonais dos campos rupestres e cerrado
Beneficiário:Leonor Patricia Cerdeira Morellato
Linha de fomento: Auxílio à Pesquisa - Parceria para Inovação Tecnológica - PITE
Processo FAPESP: 12/19827-0 - Padrões sazonais na produção, composição química, cor e contraste dos frutos no cerrado
Beneficiário:Maria Gabriela Gutierrez de Camargo
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado