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16 results for “Egyptian fruit bat”
Fig. 1 in Is the Egyptian fruit-bat Rousettus aegyptiacus a pest in Israel? An analysis of the bat's diet and implications for its conservation
Fig. 1. Monthly mean number of droppings (with standard error bars) of Rousettus aegyptiacus in Nachash and Rakefet caves during 1994 and 1995. Samples collected from three 1 m2 sheets during 48 h each month.
Tracks for Egyptian fruit bats included in the field manipulation for testing the use of the communal roost as an information center hypothesis
<p>According to the Information Centre Hypothesis (ICH), colonial species use social information in roosts to locate ephemeral resources. Validating the ICH necessitates showing that uninformed individuals follow informed ones to the new resource. However, the following behavior may not be essential when not all resources are ephemeral. For instance, Egyptian fruit bats forage on spatially predictable trees, but some bear fruit at unpredictable times. These circumstances suggest an alternative ICH pathway in which bats learn when fruits emerge from social cues in the roost but then use spatial memory to locate them without following conspecifics. Here, using a unique field manipulation and high-frequency tracking data, we test for this alternative pathway: We introduced bats smeared with the fruit odor of the unpredictably fruiting <em>Ficus sycomorus </em>trees to the roost, when they bore no fruits, and then tracked the movement of conspecifics exposed to the manipulated social cue. As predicted, bats visited the <em>F. sycomorus</em> trees with significantly higher probabilities than during routine foraging trips (of >200 bats). Our results show how the integration of spatial memory and social cues leads to efficient resource tracking and highlight the value of using large movement datasets and field experiments in behavioral ecology.</p>
Tracks for Egyptian fruit bats included in the field manipulation for testing the use of the communal roost as an information center hypothesis
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Reduced gene expression and missense mutations in the transporter protein SLC45A2 in a hypopigmented Egyptian rousette fruit bat (<em>Rousettus aegyptiacus</em>)
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Data from: Environmental margin and island evolution in Middle Eastern populations of the Egyptian fruit bat
Here, we present a study of the population genetic architecture and microevolution of the Egyptian fruit bat (Rousettus aegyptiacus) at the environmental margins in the Middle East using mitochondrial sequences and nuclear microsatellites. In contrast to the rather homogenous population structure typical of cave-dwelling bats in climax tropical ecosystems, a relatively pronounced isolation by distance and population diversification was observed. The evolution of this pattern could be ascribed to the complicated demographic history at higher latitudes related to the range margin fragmentation and complex geomorphology of the studied area. Lineages from East Africa and Arabia show divergent positions. Within the northwestern unit, the most marked pattern of the microsatellite dataset is connected with insularity, as demonstrated by the separate status of populations from Saharan oases and Cyprus. These demes also exhibit a reduction in genetic variability, which is presumably connected with founder effects, drift and other potential factors related to island evolution as site-specific selection. Genetic clustering indicates a semipermeability of the desert barriers in the Sahara and Arabian Peninsula and a corridor role of the Nile Valley. The results emphasizes the role of the island environment in restricting the gene flow in megabats, which is also corroborated by biogeographic patterns within the family, and suggests the possibility of nascent island speciation on Cyprus. Demographic analyses suggest that the colonization of the region was connected to the spread of agricultural plants; therefore, the peripatric processes described above might be because of or strengthened by anthropogenic changes in the environment.
On following pages: 35. Short-palated Fruit Bat (Casinycteris argynnis); 36. Pohle's Fruit Bat (Casinycteris ophiodon); 37. Campo-Ma'an Fruit Bat (Casinycteris campomaanensis); 38. Lesser Dawn Bat (Eonycteris spelaea); 39. Greater Dawn Bat (Eonycteris major); 40. Philippine Dawn Bat (Eonycteris robusta); 41. Geoffroy's Rousette (Rousettus amplexicaudatus): 42. Bare-backed Rousette (Rousettus spinalatus); 43. Leschenault's Rousette (Rousettus leschenaultil); 44. Linduan Rousette (Rousettus linduensis); 45. Sulawesi Rousette (Rousettus celebensis); 46. Egyptian Rousette (Rousettus aegyptiacus); 47 Malagasy Rousette (Rousettus madagascariensis); 48. Comoro Rousette (Rousettus obliviosus); 49. Long-haired Fruit Bat (Stenonycteris lanosus). in Pteropodidae
On following pages: 35. Short-palated Fruit Bat (Casinycteris argynnis); 36. Pohle's Fruit Bat (Casinycteris ophiodon); 37. Campo-Ma'an Fruit Bat (Casinycteris campomaanensis); 38. Lesser Dawn Bat (Eonycteris spelaea); 39. Greater Dawn Bat (Eonycteris major); 40. Philippine Dawn Bat (Eonycteris robusta); 41. Geoffroy's Rousette (Rousettus amplexicaudatus): 42. Bare-backed Rousette (Rousettus spinalatus); 43. Leschenault's Rousette (Rousettus leschenaultil); 44. Linduan Rousette (Rousettus linduensis); 45. Sulawesi Rousette (Rousettus celebensis); 46. Egyptian Rousette (Rousettus aegyptiacus); 47 Malagasy Rousette (Rousettus madagascariensis); 48. Comoro Rousette (Rousettus obliviosus); 49. Long-haired Fruit Bat (Stenonycteris lanosus).
Figure 7 in The first vertebrate fossil from Socotra Island (Yemen) is an early Holocene Egyptian fruit bat
Figure 7. Bivariate plot of the examined samples of African and Arabian fruit bats (taxa as in Figure 6): results of the principal component analysis of skull dimensions.
Figure 2 in The first vertebrate fossil from Socotra Island (Yemen) is an early Holocene Egyptian fruit bat
Figure 2. Hoq Cave on Socotra Island (Yemen), (a) current entrance and (b) the location of the calcite flowstone speleothem with the embedded early Holocene Rousettus aegyptiacus remains before removal of the skull (c; arrow points to the skull). Photographs by Kay Van Damme (a), Dirk Van Damme (b) and Peter De Geest (c).
Figure 4. Socotran early Holocene R in The first vertebrate fossil from Socotra Island (Yemen) is an early Holocene Egyptian fruit bat
Figure 4. Socotran early Holocene R. aegyptiacus skull fragments: mandible in (a) dorsal and (b) frontal view; skull in (c) dorsal and (d) ventral view.
Figure 6 in The first vertebrate fossil from Socotra Island (Yemen) is an early Holocene Egyptian fruit bat
Figure 6. Bivariate plot of the examined specimens of African and Arabian fruit bat populations of Myonycteris,Stenonycteris, Epomophorus, Eidolon and Rousettus aegyptiacus (the latter from Egypt, W Africa, S Arabia, E. Africa and the Socotra specimen; measurements in mm). (a) Greatest length of skull (LCr) against the length of upper tooth-row (CM2). (b) Condylobasal length of skull (LCb) against the neurocranium width (LaN). See Supplementary Material for details and full list of the comparative taxa.
Figure 3. Socotran early Holocene R in The first vertebrate fossil from Socotra Island (Yemen) is an early Holocene Egyptian fruit bat
Figure 3. Socotran early Holocene R. aegyptiacus remains embedded in calcite in situ. For the full names of the structures, see under Abbreviations. Photo by Dirk Van Damme.
Figure 5. Socotran early Holocene R in The first vertebrate fossil from Socotra Island (Yemen) is an early Holocene Egyptian fruit bat
Figure 5. Socotran early Holocene R. aegyptiacus, skull viewed laterally from (a) right and (b) left; and mandible in (c) left and (d) right external lateral view.
Figure 8 in The first vertebrate fossil from Socotra Island (Yemen) is an early Holocene Egyptian fruit bat
Figure 8. AMS radiocarbon dating of the Socotran R. aegyptiacus skull fragments and calibration curve.
Figure 1 in The first vertebrate fossil from Socotra Island (Yemen) is an early Holocene Egyptian fruit bat
Figure 1. Locations of (a) the Socotra Archipelago (Yemen) in the western Indian Ocean near the Horn of Africa; (b) Hoq Cave on Socotra Island; and (c) the fruit bat fossil inside Hoq Cave, closest to an alternative fossil entrance leading to the plateau above.
Data from: Habitat use, but not gene flow, is influenced by human activities in two ecotypes of Egyptian fruit bat (Rousettus aegyptiacus)
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Data from: Environmental margin and island evolution in Middle Eastern populations of the Egyptian fruit bat
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