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Spatial association between floral resources and hummingbird activity in a Mexican tropical montane cloud forest

Published online by Cambridge University Press:  29 August 2012

Leonor Jiménez ,
Simoneta Negrete-Yankelevich  and
Rogelio Macías-Ordóñez
Leonor Jiménez
Affiliation:
Instituto de Ecología A. C., Carretera Antigua a Coatepec No. 351, El Haya, Xalapa 91070, Veracruz, México
Simoneta Negrete-Yankelevich*
Affiliation:
Instituto de Ecología A. C., Carretera Antigua a Coatepec No. 351, El Haya, Xalapa 91070, Veracruz, México
Rogelio Macías-Ordóñez
Affiliation:
Instituto de Ecología A. C., Carretera Antigua a Coatepec No. 351, El Haya, Xalapa 91070, Veracruz, México
*
1Corresponding author. Email: [email protected]
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Abstract:

Spatial distribution of resources is known to govern animal distribution and behaviour. However, few empirical studies have formally evaluated this relationship. Unlike previous studies in which a patch or gap of floral resources is defined a priori by the observer at a subjective perception scale, we used the Spatial Analysis by Distance IndicEs (SADIE) to assess the location, length and spatial co-occurrence of patches and gaps of Palicourea padifolia inflorescences and hummingbird activity (feeding, perching, vocalizing, flying past and agonistic behaviour) in a tropical montane cloud forest of central Veracruz, Mexico. Along a 1010-m transect, both resource and hummingbird activity had a distribution approximately 200% more aggregated than expected by chance, at a scale of tens to hundreds of metres in length. In addition, aggregation patterns of resource and overall and agonistic hummingbird activity were found to be positively associated in 2009 but negatively in 2010. Campylopterus curvipennis and Amazilia cyanocephala were the most frequent species involved in vocal and agonistic activity. The difference observed between the two years may be due to changes in the composition and dominance of hummingbird species with different foraging strategies. In both years, hummingbird overall activity was positively correlated to size of resource patches.

Keywords

Amazilia cyanocephalaCampylopterus curvipennishummingbird behaviourPalicourea padifoliaspatial analysis
Type
Research Article
Information
Journal of Tropical Ecology , Volume 28 , Issue 5 , September 2012 , pp. 497 - 506
Copyright
Copyright © Cambridge University Press 2012

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