NIDIFICACIÓN DE OCHO ESPECIES DE TYRANNIDAE EN LA RESERVA DE ÑACUÑÁN, MENDOZA, ARGENTINA
- E. Mezquida
- 1 August 2002
Se estudio la biologia reproductiva de ocho especies de Tyrannidae en la Reserva de Nacunan (centro-oeste de Argentina). Esta reserva se situa cerca del limite occidental o austral del rango de…
SAGE-GROUSE AND INDIRECT INTERACTIONS: POTENTIAL IMPLICATIONS OF COYOTE CONTROL ON SAGE-GROUSE POPULATIONS
It is argued that intense and extended lethal coyote control is likely detrimental to sage-grouse conservation.
Factors affecting nesting success of a bird assembly in the central Monte Desert, Argentina
Nest predation in the central Monte Desert may be an important selective pressure in birds' life history, which is in accordance with other results for South American temperate birds.
The geographic selection mosaic for squirrels, crossbills and Aleppo pine
Testing the hypothesis that a geographic selection mosaic arises for common crossbills feeding on seeds in the cones of Aleppo pine because of geographic variation in the occurrence of European red squirrels suggests that Sciurus has influenced both the geographic selection mosaics forCrossbills and conifers and the adaptive radiation of crossbilling in Eurasia much like Tamiasciurus has done in the North America.
Nest site selection and nesting success of five species of passerines in a South American open Prosopis woodland
- E. Mezquida
- Environmental ScienceJournal of Ornithology
- 8 January 2004
High nest predation rates found in this habitat and a relatively high diversity of predators appear to impede the presence of “safe” sites for nesting (i.e., there are trade-offs between avoidance strategies).
COEVOLUTION BETWEEN HISPANIOLAN CROSSBILLS AND PINE: DOES MORE TIME ALLOW FOR GREATER PHENOTYPIC ESCALATION AT LOWER LATITUDE?
- T. Parchman, C. Benkman, E. Mezquida
- Environmental ScienceEvolution; international journal of organic…
- 1 September 2007
Divergence as a result of coevolution is greater at lower latitude where crossbill–conifer interactions have been less interrupted by Pleistocene events, and indicates that cone crop fluctuations do not prevent crossbills and conifers from coevolving.
Habitat area and structure affect the impact of seed predators and the potential for coevolutionary arms races.
Red squirrels tend to be uncommon in the open mountain pine forests, consuming relatively few seeds in both regions and having limited impact on both mountain pine and the interaction between crossbills and mountain pine, while resident crossbiller bills in mountain Pine forests in the Pyrenees have larger bills than in nearby forests, consistent with local adaptation by crossbilling.
ARE RESULTS OF ARTIFICIAL NEST EXPERIMENTS A VALID INDICATOR OF SUCCESS OF NATURAL NESTS?
The results support the well established finding that artificial nests may not accurately estimate actual rates of nest predation and may provide an additional source of data to natural nests when testing ecological hypotheses.
TIMING OF AUTUMN BIRD MIGRATION IN CENTRAL SPAIN IN LIGHT OF RECENT CLIMATE CHANGE
Aims: To examine changes in the timing of migration of 10 migratory bird species (six long-distance and four short-distance migrants) during autumn passage in central Spain, comparing two periods…
Comparison of the reproductive biology of two Poospiza Warbling-Finches of Argentina in wet and dry years
The results suggest that interspecific differences in reproductive traits, in particular the unreliable breeding of the Cinnamon Warbling-Finch at Nacunan, may be an evolutionary response to different energetic limitations suffered by these congeneric bird species.