Effect of weather conditions on the communal roosting behaviour of common ravens Corvus corax with unlimited food resources

Janicke, Tim; Chakarov, Nayden

doi:10.1007/s10164-006-0209-3

Cited by 8 publications

(5 citation statements)

References 35 publications

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“…availability of food, presence of disturbances, behaviour of other mallards in the area, etc. A similar independence from weather and moon conditions was described for the common raven, Corvus corax, another extremely flexible species (Janicke & Chakarov, 2007). On the other hand, the switching between excess daylight and night activity every few days could also be (partially) independent of external factors; instead it could be an effect of an innate clock that is not in phase with the dayenight rhythm.…”

Section: Discussionmentioning

confidence: 55%

Variable allocation of activity to daylight and night in the mallard

Korner¹,

Sauter²,

Fiedler³

et al. 2016

Animal Behaviour

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Section: Discussionmentioning

confidence: 55%

Variable allocation of activity to daylight and night in the mallard

Korner¹,

Sauter²,

Fiedler³

et al. 2016

Animal Behaviour

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“…The physiological and behavioral output in birds varies dramatically as function of season. In few species, the activity declines at the advent of hotter period (Engel et al 1992;Janicke & Chakarov 2007), while in others the activity increases considerably (Peh 2002;Everding & Jones 2006). This species belongs to the latter type as the foraging period of its colony was longer in the summer months characterized by long day length and high temperature.…”

Section: Discussionmentioning

confidence: 94%

Day length and evening temperature predict circannual variation in activity duration of the colony of the Indian cliff swallow,Hirundo fluvicola

Singh

Kankariya

Pati

et al. 2014

Biological Rhythm Research

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In avian species, circannual rhythms, in a number of biological variables, including locomotor activity, have been studied under both laboratory and natural environmental conditions. However, information on circannual rhythm in daily activity duration of Indian cliff swallow (Hirundo fluvicola) is not available. It is a communal mud nesting, non-migratory species and inhabits low under arch bridges. Although it figures in the IUCN Red List under the least concerned category, it is important to study its behavioral ecology that may be of utmost importance from conservation stand point. In the present investigation, we examined the circannual rhythm in daily activity duration in this species at a communal roosting site under Kharoon river bridge on the Raipur-Bhilai highway (21°15′07.54′′N; 81°32′30.65′′E), Raipur, India, for eight consecutive days, every month from August 2009 to October 2011. On each study day, observations were made in two sessions, morning and evening. We monitored and recorded emergence time of the first bird from the nest in the morning and entry time of the last bird to the nest in the evening. We also recorded the ambient temperature and humidity of the study site simultaneously. Average daily activity duration (the time difference between the first bird's emergence time and the last bird's entry time from/to the nest, respectively) was computed for each month. A significant circannual rhythm in activity duration was validated. The peak of activity rhythm occurred on 22nd June with a spread between 19th June and 25th June. The activity duration was the shortest in winter and the longest in summer. The daily activity duration was positively correlated to the day length, sunset time, and morning and evening temperatures; whereas negatively correlated with the sunrise time, and morning and evening humidity. The multiple linear regression models suggest that day length alone explains 96% of the total variance in activity duration, whereas only 0.5% variance was attributable to evening temperature. We conclude that the day length is the strongest predictor of circannual variation in daily activity duration of the colony of Indian cliff swallow; whereas the evening temperature has very little effect. Further, we recommend that comparable studies under natural conditions might be very helpful to explore the effect of environmental cues on other intriguing behavioral decisions made by this and other avian species.

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“…Therefore, birds landed faster in roosting places when the weather was inclement. This problem was described in Montagu's harrier by Clarke (1996) and other communally roosting species like magpie Pica pica (L., 1758) (Mugaas & King 1981;Reebs 1986;Czechowski et al 2005) or the common raven Corvus corax L., 1758 (Janicke & Chakarov 2007). Fire on the marshes in 1993 caused the disintegration of communal roosting.…”

Section: Discussionmentioning

confidence: 98%

Mixed roosts in the Montagu’s harrier Circus pygargus during courtship

Wiącek¹

2010

Biologia

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Mixed communal roosting of Montagu's harrier Circus pygargus in the pre-laying period was observed on Calcareous Marshes in Eastern Poland from 1992 to 1995. To my knowledge, this behaviour was described in literature for the first time. The communal roosting in Montagu's harrier during courtship can help in estimation of mate attraction and finally in mate choice. Harriers from communal roosts start egg laying earlier when compared to the outside roosts. Communal roosting as anti-predator behaviour can help with predator detection and provides benefits to all members of the group. The pair formation process has led to disintegration of communal roosting. Males were more common in the roosting places than females. The time of roosting was correlated with the photoperiod. The weather and predators impact delayed the formation of mixed roosting places.

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Effect of weather conditions on the communal roosting behaviour of common ravens Corvus corax with unlimited food resources

Cited by 8 publications

References 35 publications

Variable allocation of activity to daylight and night in the mallard

Variable allocation of activity to daylight and night in the mallard

Day length and evening temperature predict circannual variation in activity duration of the colony of the Indian cliff swallow,Hirundo fluvicola

Mixed roosts in the Montagu’s harrier Circus pygargus during courtship

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