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Vigilance and activity time-budget adjustments of wintering hooded cranes, Grus monacha, in human-dominated foraging habitats.

Li C, Zhou L, Xu L, Zhao N, Beauchamp G - PLoS ONE (2015)

Bottom Line: Our results showed striking differences in the behavior of the cranes when foraging in the highly disturbed rice paddy fields found in the buffer zone compared with the degraded natural wetlands in the core area of the NNR.Time spent vigilant decreased with flock size and cranes spent more time vigilant in the human-dominated buffer zone.We recommend habitat recovery in natural wetlands and community co-management in the surrounding human-dominated landscape for conservation of the hooded crane and, generally, for the vast numbers of migratory waterbirds wintering in the middle and lower reaches of the Yangtze River floodplain.

View Article: PubMed Central - PubMed

Affiliation: School of Resources and Environmental Engineering, Anhui University, Hefei, China; Anhui Biodiversity Information Center, Hefei, China.

ABSTRACT
Due to loss and degradation of natural wetlands, waterbirds increasingly rely on surrounding human-dominated habitats to obtain food. Quantifying vigilance patterns, investigating the trade-off among various activities, and examining the underlying mechanisms will help us understand how waterbirds adapt to human-caused disturbances. During two successive winters (November-February of 2012-13 and 2013-14), we studied the hooded crane, Grus monacha, in the Shengjin Lake National Nature Reserve (NNR), China, to investigate how the species responds to human disturbances through vigilance and activity time-budget adjustments. Our results showed striking differences in the behavior of the cranes when foraging in the highly disturbed rice paddy fields found in the buffer zone compared with the degraded natural wetlands in the core area of the NNR. Time spent vigilant decreased with flock size and cranes spent more time vigilant in the human-dominated buffer zone. In the rice paddy fields, the birds were more vigilant but also fed more at the expense of locomotion and maintenance activities. Adult cranes spent more time vigilant and foraged less than juveniles. We recommend habitat recovery in natural wetlands and community co-management in the surrounding human-dominated landscape for conservation of the hooded crane and, generally, for the vast numbers of migratory waterbirds wintering in the middle and lower reaches of the Yangtze River floodplain.

No MeSH data available.


Survey sites.During two successive winters (November-February 2012–13 and 2013–14), we studied vigilance and activity time budget of the hooded crane in both the buffer zone and the core area of the Shengjin Lake National Nature Reserve (NNR), China.
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pone.0118928.g001: Survey sites.During two successive winters (November-February 2012–13 and 2013–14), we studied vigilance and activity time budget of the hooded crane in both the buffer zone and the core area of the Shengjin Lake National Nature Reserve (NNR), China.

Mentions: The study was carried out in the upper part of Shengjin Lake (30°15’–30°30’N, 116°55’–117°15’E), which is located on the south bank of middle and lower reaches of Yangtze River (Fig. 1). The Shengjin Lake NNR was established in 1986 and upgraded to a national status in 1997. It joined the Northeast Asia Crane Network Protection Zone in 2002 and the East Asian—Australasian birds Migration Network in 2010. The total reserve covers c. 33,340 ha and the core area encompasses the entire lake area, which reaches a maximum area of c. 14,000 ha in summer. Some 4,000 ha of the riparian mudflat and meadow are exposed during November to March when the water level falls. The average annual rainfall is 1,600 mm, with most falling from March to August. The average annual temperature is 16.1°C, with an average January temperature of 4.0°C.


Vigilance and activity time-budget adjustments of wintering hooded cranes, Grus monacha, in human-dominated foraging habitats.

Li C, Zhou L, Xu L, Zhao N, Beauchamp G - PLoS ONE (2015)

Survey sites.During two successive winters (November-February 2012–13 and 2013–14), we studied vigilance and activity time budget of the hooded crane in both the buffer zone and the core area of the Shengjin Lake National Nature Reserve (NNR), China.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4359144&req=5

pone.0118928.g001: Survey sites.During two successive winters (November-February 2012–13 and 2013–14), we studied vigilance and activity time budget of the hooded crane in both the buffer zone and the core area of the Shengjin Lake National Nature Reserve (NNR), China.
Mentions: The study was carried out in the upper part of Shengjin Lake (30°15’–30°30’N, 116°55’–117°15’E), which is located on the south bank of middle and lower reaches of Yangtze River (Fig. 1). The Shengjin Lake NNR was established in 1986 and upgraded to a national status in 1997. It joined the Northeast Asia Crane Network Protection Zone in 2002 and the East Asian—Australasian birds Migration Network in 2010. The total reserve covers c. 33,340 ha and the core area encompasses the entire lake area, which reaches a maximum area of c. 14,000 ha in summer. Some 4,000 ha of the riparian mudflat and meadow are exposed during November to March when the water level falls. The average annual rainfall is 1,600 mm, with most falling from March to August. The average annual temperature is 16.1°C, with an average January temperature of 4.0°C.

Bottom Line: Our results showed striking differences in the behavior of the cranes when foraging in the highly disturbed rice paddy fields found in the buffer zone compared with the degraded natural wetlands in the core area of the NNR.Time spent vigilant decreased with flock size and cranes spent more time vigilant in the human-dominated buffer zone.We recommend habitat recovery in natural wetlands and community co-management in the surrounding human-dominated landscape for conservation of the hooded crane and, generally, for the vast numbers of migratory waterbirds wintering in the middle and lower reaches of the Yangtze River floodplain.

View Article: PubMed Central - PubMed

Affiliation: School of Resources and Environmental Engineering, Anhui University, Hefei, China; Anhui Biodiversity Information Center, Hefei, China.

ABSTRACT
Due to loss and degradation of natural wetlands, waterbirds increasingly rely on surrounding human-dominated habitats to obtain food. Quantifying vigilance patterns, investigating the trade-off among various activities, and examining the underlying mechanisms will help us understand how waterbirds adapt to human-caused disturbances. During two successive winters (November-February of 2012-13 and 2013-14), we studied the hooded crane, Grus monacha, in the Shengjin Lake National Nature Reserve (NNR), China, to investigate how the species responds to human disturbances through vigilance and activity time-budget adjustments. Our results showed striking differences in the behavior of the cranes when foraging in the highly disturbed rice paddy fields found in the buffer zone compared with the degraded natural wetlands in the core area of the NNR. Time spent vigilant decreased with flock size and cranes spent more time vigilant in the human-dominated buffer zone. In the rice paddy fields, the birds were more vigilant but also fed more at the expense of locomotion and maintenance activities. Adult cranes spent more time vigilant and foraged less than juveniles. We recommend habitat recovery in natural wetlands and community co-management in the surrounding human-dominated landscape for conservation of the hooded crane and, generally, for the vast numbers of migratory waterbirds wintering in the middle and lower reaches of the Yangtze River floodplain.

No MeSH data available.