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Echolocation calls in Central American emballonurid bats: signal design and call frequency alternation
A model of how frequency alternation could increase the maximum detection distance of obstacles by marking search calls with different frequencies is proposed and discussed, including species identification and partitioning of acoustic channels.
Resource partitioning of sonar frequency bands in rhinolophoid bats
SummaryIn the Constant Frequency portions of the orientation calls of various Rhinolophus and Hipposideros species, the frequency with the strongest amplitude was studied comparatively. (1) In the…
Home Range, Population Density, and Food Resources of Agouti paca (Rodentia: Agoutidae) in Costa Rica: A Study Using Alternative Methods 1
The results suggest that A. paca plays a major, although not fully understood, ecological role in seed predation and dispersal in a Pacific lowland forest of Costa Rica.
Cryptic diversity in European bats
- F. Mayer, O. V. Helversen
- Biology, Environmental ScienceProceedings of the Royal Society of London…
- 7 September 2001
Two morphologically clearly different species of bat were found to be genetically very similar and Convergent adaptive evolution might have contributed to the morphological similarity among distantly related species if they occupy similar ecological niches.
Ultraviolet vision in a bat
It is shown that a phyllostomid flower bat, Glossophaga soricina, is colour-blind but sensitive to ultraviolet light down to a wavelength of 310 nm, indicating that excitation of the β-band of the visual pigment is the most likely cause of ultraviolet sensitivity.
Effects of Artificial Roosts for Frugivorous Bats on Seed Dispersal in a Neotropical Forest Pasture Mosaic
- Detlev H Kelm, K. Wiesner, O. V. Helversen
- Environmental ScienceConservation biology : the journal of the Society…
- 1 June 2008
The installation of artificial bat roosts for frugivorous bat species can attract these key seed dispersers to deforested areas, thereby increasing seed rain and supporting natural forest regeneration and bat conservation, and can also increase environmental awareness among landowners.
Cryptic species and behavioural isolation in the Pardosa lugubris group (Araneae, Lycosidae), with description of two new species.
The chemical composition of the spermatophore in some species of phaneropterid bushcrickets (Orthoptera: Tettigonioidea).
Recognition of sex in the acoustic communication of the grasshopper Chorthippus biguttulus (Orthoptera, Acrididae)
Signals and recognition mechanisms were investigated in Chorthippus biguttulus with regard to the cues which allow sex discrimination, and it was found that recognition of a mate's signal depends on species-specific syllable structure.
EXTRA-HAREM PATERNITY IN THE WHITE-LINED BAT SACCOPTERYX BILINEATA (EMBALLONURIDAE)
Although maintaining of a territory seems to be costly for a harem male, his ability to control the females of his harem may be restricted; instead female Saccopteryx bilineata appear to have a high potential for female choice.