Seasonal influence on the diurnal roosting behaviour of free-ranging Indian flying fox Pteropus giganteus in an urban landscape, India

Roy, Kanad; Saha, Goutam Kumar; Mazumdar, Subhendu

doi:10.2478/s11756-020-00472-4

Cited by 13 publications

(12 citation statements)

References 43 publications

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“…All the species we recorded are consistent with several past studies where these species are reported from the human habitations across the world. For the other species we cannot state conclusively whether they are becoming more dependent on the novel resources in human habitations and thus venturing into these habitats, which has been noticed quite commonly in case of birds of prey and lesser cats (Mazumdar et al, 2018;Roy et al, 2020;Chakraborty et al, 2020 a,b). Moreover, the Riverside Zones (RS) are threatened by habitat destruction, urbanisation and anthropogenic interventions and these three may act as a primary cause for the presence of least number of mammals from this particular zone.…”

Section: Discussionmentioning

confidence: 98%

A survey on the mammal species from a peri-urban coal mining plateau of Eastern India

Gayen

Chatterjee

Bhattacharya

2021

JAD

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The present study was conducted to determine the diversity of mammalian species from a peri-urban coal mining region of West Bengal for almost three years from September 2017 to August 2020. The survey was done on the basis of direct sightings, extensive searches, detection and identification of indirect mammalian signs such as pug marks and droppings, opportunistic sightings and road-kill incidents. Secondary information from previous literature and information from local people, citizen scientists and Forest Department were also included in the study. A total of 20 mammals belonging to 9 orders, 15 families and 20 genera were observed from 31 locations during the present study and 6 species belonging to two orders, three families and four genera which were previously reported from the present study location but not observed during this study were also included in the list. Two endangered species, Asian Elephant Elephas maximus and Indian Pangolin Manis crassicaudata, were observed from the present study location within the study period. Based on the habitat types, the maximum number of species was observed from the Human Habitation (HH) areas whereas the least number of species was noted from the Riverside Zones (RS). Proportion of the different habitat types for each mammalian species found in the present study and also obtained from literature depicted that Asian House Shrew Suncus murinus, Asian Palm Squirrel Funambulus pennantii and Indian Pygmy Pipistrelle Pipistrellus mimus were among the most abundant mammals in the study area. Golden Jackal Canis aureus was observed from a wide variety of habitat types whereas the two varieties of civets were only observed from the riverside areas. Principle Component Analysis between species and habitat type indicated that the Bengal Fox Vulpes bengalensis and the Black-naped Hare Lepus nigricollis were only associated with the grasslands. The Hanuman Langur Semnopithecus entellus and other small rodent species were generally found in the human habitation areas. Various threats like habitat destruction, habitat degradation and hunting posed the major problems in the present study location.

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Section: Discussionmentioning

confidence: 98%

A survey on the mammal species from a peri-urban coal mining plateau of Eastern India

Gayen

Chatterjee

Bhattacharya

2021

JAD

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“…Hanging relaxation was more dominant in the non‐aggregated group than in the aggregated group, indicating that solitary or loosely associated bats may exhibit a different energy allocation strategy, possibly involving increased vigilance to defend against potential threats (Harten et al., 2018; Kelm et al., 2021; Markus & Blackshaw, 2002). Sleep is the second most frequently observed behaviour in non‐aggregated bat colonies (25% of their activities; Harding et al., 2022; Lewis, 1996; Roy et al., 2020). Generally, the observed alertness in both aggregations can be associated with the presence of aggressive predators in the bat cave, which prey on bats, irrespective of roosting density (Tanalgo et al., 2020).…”

Section: Discussionmentioning

confidence: 99%

The behavioural costs of overcrowding for gregarious cave‐dwelling bats

Respicio,

Dela Cruz,

Hughes

et al. 2024

Journal of Animal Ecology

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Bats are known for their gregarious social behaviour, often congregating in caves and underground habitats, where they play a pivotal role in providing various ecosystem services. Studying bat behaviour remains an underexplored aspect of bat ecology and conservation despite its ecological importance. We explored the costs and impacts of overcrowding on bat social behaviour. This study examined variations in bat behavioural patterns between two distinct groups, aggregated and non‐aggregated male Rousettus amplexicaudatus, within the Monfort Bat Cave Sanctuary on Mindanao Island, Philippines. We found significant variations in the incident frequencies of various bat behavioural activities, particularly aggression and movement, between these two groups. The increase in aggregation was closely related to negative social behaviour among bats. In contrast, sexual behaviour was significantly related to the positive behaviour of individual bats and was headed in less crowded areas. The disparities in bat behaviour with an apparent decline in bat social behaviour because of overcrowding, with more aggressive behaviours emerging, align with the ‘behavioural sink’ hypothesis. Our study underscores the importance of considering habitat quality and resource availability in the management and conservation of bat colonies, as these factors can reduce the occurrence of aggressive and negative social behaviours in colonies with high population density by providing alternative habitats.

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“…The independent variables that were a priori selected to influence the time of emergence comprised: season, sunset time, age and sex classes, BCI, and time of return. For the return analysis, the initial independent variables were Variance Inflation Factor (VIF) was used to detect multicollinearity between independent variables; collinearity between the variables occurs when VIF>4 (Gehrt and Chelsvig 2003;García et al 2015;Ripperger et al 2015). Independent variables that were not collinear were used in the Generalized Linear Model (GLM) in order to determine those having significant influence on the dependent variables.…”

Section: Discussionmentioning

confidence: 99%

“…Thomas et al (1991), andSpeakman (1995) and Reher et al (2018) have shown that the risk of hyperthermia in tropical bats, including Pteropodidae, is positively correlated with the ambient temperature. In addition, Pteropodidae have difficulty flying during heavy rains Roy et al 2020), when they might have problems with hypothermia given their limited cold tolerance (Downs et al 2012). Hence, taking these aspects into account, during the wet season, particularly on nights with heavy or continuous rain, R. madagascariensis might be forced to forage for shorter bouts, and probably in the vicinity of the cave.…”

Section: Influence Of Seasonmentioning

confidence: 99%

Timing of emergence and cave return, and duration of nocturnal activity in an endemic Malagasy fruit bat

Ramanantsalama

2020

Trop Zool

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Bats emerge from their day roost after dusk and different factors can affect the timing of departure, return, and duration of nocturnal activities. This study provides information on the time of emergence and return of an endemic Malagasy fruit bat, Rousettus madagascariensis, in a cave located in the Réserve Spéciale d’Ankarana, northern Madagascar. Individuals were captured in a narrow passage between the roost and cave exit and capture time for each individual was noted. Variation according to sex, age, and body condition, as well as the influence of season, and the sunset and sunrise time were analyzed. During the dry season, individuals started to emerge at 1913 hours and returned to the cave generally by 0505 hours; the duration of time outside the cave during the dry season was higher in adult females (0952 hours) followed by subadult males (0937 hours), sub-adult females (0931 hours), and adult males (0910 hours). During the wet season, individuals exited at 1926 hours and returned at 0351 hours; as in the dry season, adult females spent more time outside the cave (0833 hours), than sub-adult females (0800 hours), and adult males (0752 hours). The period of emergence varied according to the age and sex classes, and time of predawn return associated with the previous nocturnal activity. The period of return was influenced by season, and age and sex classes. Such information is useful to quantify shifts in bat ecology, especially for endemic species with limited distribution or those playing an important role in ecosystem services.

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Seasonal influence on the diurnal roosting behaviour of free-ranging Indian flying fox Pteropus giganteus in an urban landscape, India

Cited by 13 publications

References 43 publications

A survey on the mammal species from a peri-urban coal mining plateau of Eastern India

A survey on the mammal species from a peri-urban coal mining plateau of Eastern India

The behavioural costs of overcrowding for gregarious cave‐dwelling bats

Timing of emergence and cave return, and duration of nocturnal activity in an endemic Malagasy fruit bat

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