Estimation of population density of Eidolon helvum on the island of Príncipe, Gulf of Guinea / Estimation de densité de population de Eidolon helvum sur l'île de Príncipe, Golfe de Guinée

Mammalia ◽  
2006 ◽  
Vol 70 (1-2) ◽  
Author(s):  
Martin Dallimer ◽  
Tony King ◽  
David Cope ◽  
Manuel Borge Jiana
Keyword(s):  
Population Density ◽  
Food Resources ◽  
Gulf Of Guinea ◽  
Migratory Behaviour ◽  
Fruit Bat ◽  
Large Numbers ◽  
Eidolon Helvum

AbstractEidolon helvum is a widespread African fruit bat. It is migratory and can form colonies of millions of individuals. On Príncipe, in the Gulf of Guinea, there are seemingly large numbers of E. helvum . Here, they have lost their migratory behaviour and rely on the availability of the year-round food resources on the island, which is small (128 km

Estimation of population density of Eidolon helvum on the island of Príncipe, Gulf of Guinea / Estimation de densité de population de Eidolon helvum sur l'île de Príncipe, Golfe de Guinée

Mammalia ◽  
2006 ◽  
Vol 70 (1-2) ◽  
Author(s):  
Martin Dallimer ◽  
Tony King ◽  
David Cope ◽  
Manuel Borge Jiana
Keyword(s):  
Population Density ◽  
Food Resources ◽  
Gulf Of Guinea ◽  
Migratory Behaviour ◽  
Fruit Bat ◽  
Large Numbers ◽  
Eidolon Helvum

AbstractEidolon helvum is a widespread African fruit bat. It is migratory and can form colonies of millions of individuals. On Príncipe, in the Gulf of Guinea, there are seemingly large numbers of E. helvum . Here, they have lost their migratory behaviour and rely on the availability of the year-round food resources on the island, which is small (128 km

scholarly journals Assessing roost disturbance of straw-coloured fruit bats (Eidolon helvum) through tri-axial acceleration

PLoS ONE ◽  
2020 ◽  
Vol 15 (11) ◽  
pp. e0242662
Author(s):  
Tânia Domingues Costa ◽  
Carlos D. Santos ◽  
Ana Rainho ◽  
Michael Abedi-Lartey ◽  
Jakob Fahr ◽  
...  
Keyword(s):  
Global Positioning System ◽  
Solar Irradiance ◽  
Positioning System ◽  
Fruit Bats ◽  
Fruit Bat ◽  
Large Numbers ◽  
Axial Acceleration ◽  
Global Positioning ◽  
Worldwide Phenomenon ◽  
Eidolon Helvum

The disturbance of wildlife by humans is a worldwide phenomenon that contributes to the loss of biodiversity. It can impact animals’ behaviour and physiology, and this can lead to changes in species distribution and richness. Wildlife disturbance has mostly been assessed through direct observation. However, advances in bio-logging provide a new range of sensors that may allow measuring disturbance of animals with high precision and remotely, and reducing the effects of human observers. We used tri-axial accelerometers to identify daytime flights of roosting straw-coloured fruit bats (Eidolon helvum), which were used as a proxy for roost disturbance. This bat species roosts on trees in large numbers (often reaching hundreds of thousands of animals), making them highly vulnerable to disturbance. We captured and tagged 46 straw-coloured fruit bats with dataloggers, containing a global positioning system (GPS) and an accelerometer, in five roosts in Ghana, Burkina Faso and Zambia. Daytime roost flights were identified from accelerometer signatures and modelled against our activity in the roosts during the days of trapping, as a predictor of roost disturbance, and natural stressors (solar irradiance, precipitation and wind speed). We found that daytime roost flight probability increased during days of trapping and with increasing solar irradiance (which may reflect the search for shade to prevent overheating). Our results validate the use of accelerometers to measure roost disturbance of straw-coloured fruit bats and suggest that these devices may be very useful in conservation monitoring programs for large fruit bat species.

Bartonellaspecies in bat flies (Diptera: Nycteribiidae) from western Africa

Parasitology ◽  
2012 ◽  
Vol 139 (3) ◽  
pp. 324-329 ◽  
Author(s):  
S. A. BILLETER ◽  
D. T. S. HAYMAN ◽  
A. J. PEEL ◽  
K. BAKER ◽  
J. L. N. WOOD ◽  
...  
Keyword(s):  
Pcr Analysis ◽  
Gulf Of Guinea ◽  
Bat Flies ◽  
Western Africa ◽  
Fruit Bat ◽  
Bat Fly ◽  
Eidolon Helvum

SUMMARYBat flies are obligate ectoparasites of bats and it has been hypothesized that they may be involved in the transmission ofBartonellaspecies between bats. A survey was conducted to identify whetherCyclopodia greefi greefi(Diptera: Nycteribiidae) collected from Ghana and 2 islands in the Gulf of Guinea harbourBartonella. In total, 137 adult flies removed fromEidolon helvum, the straw-coloured fruit bat, were screened for the presence ofBartonellaby culture and PCR analysis.BartonellaDNA was detected in 91 (66·4%) of the specimens examined and 1 strain of aBartonellasp., initially identified inE. helvumblood from Kenya, was obtained from a bat fly collected in Ghana. This is the first study, to our knowledge, to report the identification and isolation ofBartonellain bat flies from western Africa.

scholarly journals Characterization of a Novel Bat Adenovirus Isolated from Straw-Colored Fruit Bat (Eidolon helvum)

Viruses ◽  
2017 ◽  
Vol 9 (12) ◽  
pp. 371 ◽  
Author(s):  
Hirohito Ogawa ◽  
Masahiro Kajihara ◽  
Naganori Nao ◽  
Asako Shigeno ◽  
Daisuke Fujikura ◽  
...  
Keyword(s):  
Fruit Bat ◽  
Eidolon Helvum

scholarly journals Foraging movements are density-independent among straw-coloured fruit bats

2020 ◽  
Vol 7 (5) ◽  
pp. 200274
Author(s):  
María C. Calderón-Capote ◽  
Dina K. N. Dechmann ◽  
Jakob Fahr ◽  
Martin Wikelski ◽  
Roland Kays ◽  
...  
Keyword(s):  
Intraspecific Competition ◽  
Colony Size ◽  
Resource Depletion ◽  
Central Place ◽  
Long Distance ◽  
Foraging Patterns ◽  
Fruit Bat ◽  
Foraging Movements ◽  
Productive Landscapes ◽  
Eidolon Helvum

Intraspecific competition in large aggregations of animals should generate density-dependent effects on foraging patterns. To test how large differences in colony size affect foraging movements, we tracked seasonal movements of the African straw-coloured fruit bat ( Eidolon helvum ) from four colonies that range from 4000 up to 10 million animals. Contrary to initial predictions, we found that mean distance flown per night (9–99 km), number of nightly foraging sites (2–3) and foraging and commuting times were largely independent of colony size. Bats showed classic central-place foraging and typically returned to the same day roost each night. However, roost switching was evident among individuals in three of the four colonies especially towards the onset of migration. The relatively consistent foraging patterns across seasons and colonies indicate that these bats seek out roosts close to highly productive landscapes. Once foraging effort starts to increase due to local resource depletion they migrate to landscapes with seasonally increasing resources. This minimizes high intraspecific competition and may help to explain why long-distance migration, otherwise rare in bats, evolved in this highly gregarious species.

Seasonal variations in the morphology of the seminal vesicles of the African straw‐coloured fruit bat ( Eidolon helvum )

2020 ◽  
Author(s):  
Clifford Nwabugwu Abiaezute ◽  
Innocent Chima Nwaogu ◽  
Ikechukwu Reginald Obidike ◽  
Udensi Maduabuchi Igwebuike
Keyword(s):  
Seasonal Variations ◽  
Seminal Vesicles ◽  
Fruit Bat ◽  
Eidolon Helvum

scholarly journals The Movement Ecology of the Straw-Colored Fruit Bat, Eidolon helvum, in Sub-Saharan Africa Assessed by Stable Isotope Ratios

PLoS ONE ◽  
2012 ◽  
Vol 7 (9) ◽  
pp. e45729 ◽  
Author(s):  
Gonzalo Ossa ◽  
Stephanie Kramer-Schadt ◽  
Alison J. Peel ◽  
Anne K. Scharf ◽  
Christian C. Voigt
Keyword(s):  
Stable Isotope ◽  
Movement Ecology ◽  
Isotope Ratios ◽  
Sub Saharan Africa ◽  
Stable Isotope Ratios ◽  
Fruit Bat ◽  
Sub Saharan ◽  
Eidolon Helvum

The parasitic life-cycle of the swine kidney worm Stephanurus dentatus Diesing

1969 ◽  
Vol 17 (4) ◽  
pp. 607 ◽  
Author(s):  
AH Waddall
Keyword(s):  
Peritoneal Cavity ◽  
Migratory Behaviour ◽  
Fourth Stage ◽  
Mature Adult ◽  
Large Numbers ◽  
Third Stage ◽  
Parasitic Life Cycle ◽  
Patent Infection ◽  
Swine Kidney ◽  
Small And Large Intestine

Third-stage larvae of S. dentatus exsheath in and invade the tissues of a variety of animals. After oral infection of guinea pigs and pigs, third-stage larvae migrate principally from the small and large intestine via the portal blood, mesenteric lymphatics, and, to a lesser degree, the peritoneal cavity. Large numbers of larvae invade the liver, and it was shown that some larvae can escape from the liver and lungs. After infection via the skin, third-stage larvae migrate mainly to the lungs. There was evidence that some larvae undertake a tracheal migration from the lungs and subsequently penetrate the digestive tract. The third moult occurs in a variety of tissues, and by using transplantation techniques, it was shown that fourth-stage larvae are capable of extensive migration. The liver is the most suitable organ for the development of fourth-stage larvae and immature adult worms. The migratory behaviour of mature adult worms was studied by transplanting adult worms into the peritoneal cavity. One patent infection was established using this technique, but it appeared that most worms migrated randomly throughout the carcass.

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