Now showing items 11-20 of 71
Genetic And Morphological Variation Of The Sooty-capped Bush Tanager (Chlorospingus Pileatus), A Highland Endemic Species From Costa Rica And Western Panama
We examined the effect of geographic isolation on morphology, genetic structure, and abundance of the Sooty-capped Bush Tanager (Chlorospingus pileatus), an endemic species restricted to highlands of Costa Rica and western ...
The roles of history and habitat area in the distribution and composition of avian species assemblages in the highlands of Costa Rica
Bird species assemblages in isolated Neotropical highland mountains have been moulded by the drastic climatic changes that occurred in late Pleistocene. Palynological evidence indicates that after the Pleistocene the ...
Function of the upper tangle in webs of young Leucauge argyra (Araneae: Tetragnathidae)
Ontogenetic changes in web structure occur in many spiders of different families, but the functional adaptation of differences in web structure is unknown for most species. We describe the ontogenetic changes in web structure ...
Egg sac construction by folding dead leaves in Pozonia nigroventris and Micrathena sp. (Araneae: Araneidae)
Published descriptions of egg sac construction behavior in araneids are scarce. We describe egg sac construction and oviposition in one individual of the poorly known araneid Pozonia nigroventris (Bryant 1936) and two ...
Alimentacion de pichones, exito reproductivo y notas sobre cuido parental en yiguirros (Turdus grayi): el rol de las hembras y machos
Nestling feeding, nest success, and notes of parental care in the Clay-colored Thrush (Turdus grayi): the role of females and males
Las hembras frecuentemente invierten ma ́s que los machos en cuido parental, pero en sistemas sociales monogamos, los machos invierten tanto como las hembras en el cuido de su progenie y se estima que esta contribucion ...
Extreme Behavioral Adjustments by an Orb‐Web Spider to Restricted Spaces
Adaptive flexibility in response to environmental variation is often advantageous and occurs in many types of traits in many species. Although the basic designs of the orb webs of a given species are relatively uniform, ...
Characteristics of male Spot-bellied Bobwhite (Colinus leucopogon) song during territory establishment
In song-learning birds, male song shows a large inter-individual variation that frequently plays an important role in intra- and inter-sexual selection. In other bird groups, such as Galliformes, song learning is absent, ...
Static allometry and sexual size dimorphism in Centruroides margaritatus (Scorpiones: Buthidae)
Abstract. Animal body traits are scaled relative to overall body size depending on the evolutionary context. Most naturally selected traits are scaled approximately isometrically (constitute a constant proportion of the ...
Characteristics of the cocoon and natural history of the gregarious Meteorus restionis sp. n. (Hymenoptera, Braconidae, Meteorinae) from Costa Rica
A new species of a gregarious Meteorus wasp (Braconidae) constructs an unusual cocoon mass. Meteorus restionis sp. n. is described and distinguished from similar species. Cocoons of M. restionis are dark-brown, ovoid, and ...