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Nest Predation and Nest-Site Selection of a Western Population of the Hermit Thrush
Nestsite selection appears to be a function of characteristics in the immediate vicinity of the nest (concealment, overhead cover, nest orientation), but also on a larger scale surrounding the nest, may cast light on the question of whether nest sites limit territory and habitat selection by birds.
Nest predation experiments with quail eggs : too much to swallow?
- J. Roper
- 1 December 1992
0P 0N I I ? Opinion is intended to facilitate communication between reader and author and reader and N reader. Comments, viewpoints or suggestions arising from published papers are welcome.…
Phenological patterns among plant life-forms in a subtropical forest in southern Brazil
Phenological patterns in this Araucaria forest appear to be associated with the most predictable and highly correlated of the climatic variables, daylength and temperature and least so with rainfall, which is unpredictable.
An experimental test of colonization ability in the potentially invasive Didemnum perlucidum (Tunicata, Ascidiacea)
While recruitment was somewhat greater (number of new colonies) on bare plates, this species can colonize already occupied substrates and, surprisingly, colony area was always similar between treatments, thus, D. perlucidum colonizes substrates very efficiently, especially when unoccupied space is available.
Ascidians at the Pacific and Atlantic entrances to the Panama Canal
A high diversity of ascidians on both sides of the canal, dominated by non-native species; six species occurred at both Pacific and Atlantic Panama sites; this is the first report of Polyandrocarpa anguinea and P. sagamiensis in Atlantic Panama waters.
Potential control of Aedes aegypti (Diptera: Culicidae) with Piper aduncum L. (Piperaceae) extracts demonstrated by chromosomal biomarkers and toxic effects on interphase nuclei.
- M. Rafael, W. J. Hereira-Rojas, J. Roper, S. M. Nunomura, W. Tadei
- Biology, MedicineGenetics and molecular research : GMR
The genotoxic effects of dillapiol described here suggest that this natural product may be a useful alternative for the control of A. aegypti.
Avoid nest predation when predation rates are low, and other lessons: testing the tropical–temperate nest predation paradigm
Simulations suggest that selection most strongly favors a reduction in nest predation when breeding seasons are short and predation rates are low (temperate characteristics); Conversely, selection favors shorter renesting intervals whenbreeding seasons are long and nest predations are high (tropical characteristics).
Sexually distinct songs in the duet of the sexually monomorphic Rufous Hornero
- J. Roper
- 1 July 2005
It is reported that each sex consistently sings a distinct song during the duet: the song starts with both sexes singing identically, followed by a divergence of the female, who slows her singing rate.
A test of the Skutch hypothesis: does activity at nests increase nest predation risk?
The research presented here, and the preliminary data describing potential nest predators, do not support Skutch's idea that predators are attracted to activity at nests.
Use of artificial substrata by introduced and cryptogenic marine species in Paranaguá Bay, southern Brazil
The ability to colonise stable concrete walls shows that introduced species could also colonise the natural granite rocky substrata in the bay, and the ability to Colonise floating surfaces indicate their capability of spreading in the region on the hulls of recreational boats.