Hummingbirds and Their Floral Resources in a Tropical Dry Forest in Mexico
Flowering phenology, nectar production, and hummingbird visits to flowers, and morphological measurements of hummingbirds and plants were made.
Comparative Phylogeographic Analyses Illustrate the Complex Evolutionary History of Threatened Cloud Forests of Northern Mesoamerica
This study indicates that the evolutionary history of contemporary cloud forest lineages is complex and often lineage-specific, and thus difficult to capture in a simple conservation strategy.
Phylogenetic analysis of interspecific variation in nectar of hummingbird‐visited plants
- J. Ornelas, M. Ordano, A. De-Nova, M. E. Quintero, T. Garland
- Environmental ScienceJournal of Evolutionary Biology
- 1 September 2007
Both nonphylogenetic and phylogenetically informed analyses indicated a highly significant positive correlation between corolla length and both nectar volume and sugar production, and altitude was significantly negatively correlated with both sugar concentration and production.
Forecasting cloud forest in eastern and southern Mexico: conservation insights under future climate change scenarios
Using ENM-based predictions and climatic data for IPCC climate change A2 and B2 scenarios, 54–76% reduction of the cloud forest is observed, mainly in the northern region of its current range (Sierra Madre Oriental) and the Pacific slope of Chiapas.
Phylogeography of Podocarpus matudae (Podocarpaceae): pre‐Quaternary relicts in northern Mesoamerican cloud forests
A phylogeographic study of Podocarpus matudae (Podocarpaceae) was conducted to identify any major evolutionary divergences or disjunctions across its range and to determine if its current distribution is associated with pre‐Quaternary climatic and/or long‐distance dispersal events.
Reproductive conflicts ofPalicourea padifolia (Rubiaceae) a distylous shrub of a tropical cloud forest in Mexico
There were several tantalizing differences observed between pin and thrum morphs, but there were no differences between morphs in fruit and seed set per flower following legitimate pollination although thrums were more leaky than the pins (intramorph compatibility).
The macroecology of phylogenetically structured hummingbird–plant networks
Higher levels of specialization and modularity were associated with species-rich communities and communities in which closely related hummingbirds visited distinct sets of flowering species, indicating a tighter co-evolutionary association between hummingbirds and their plants than in previously studied plant–bird mutualistic systems.
Selection and geographic isolation influence hummingbird speciation: genetic, acoustic and morphological divergence in the wedge-tailed sabrewing (Campylopterus curvipennis)
- Clementina González, J. Ornelas, C. Gutiérrez-Rodríguez
- BiologyBMC Evolutionary Biology
- 8 February 2011
Coalescent analyses of the evolution of phenotypic traits suggest that selection is driving song evolution in wedge-tailed sabrewing lineages in Mesoamerica but drift could not be rejected as a possibility for morphological divergence.
Reproductive ecology of distylous Palicourea padifolia (Rubiaceae) in a tropical montane cloud forest. II. Attracting and rewarding mutualistic and antagonistic visitors.
- J. Ornelas, Clementina González, Leonore Jimenez, C. Lara, Armando J. Martínez
- Biology, MedicineAmerican-Eurasian journal of botany
- 1 July 2004
Pollinators and herbivores may exert selective pressures on floral and vegetative traits that could also influence gender function in hummingbird-pollinated Palicourea padifolia.
Flower mites and nectar production in six hummingbird-pollinated plants with contrasting flower longevities
It is proposed that nectar production has increased over evolutionary time not only by the selective pressures imposed by the pollinators, but also to compensate for the reduction they suffer after exploitation by nectar robbers and thieves such as flower mites.