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Nest characteristics and morphometry of Black Crowned Cranes Balearica pavonina ceciliae in Lake Tana area wetlands

Nest characteristics and morphometry of Black Crowned Cranes Balearica pavonina ceciliae in Lake... Birds select breeding habitats based on biotic and abiotic environmental factors, resulting in a non-random spatial distribution of nests. This study investigated the onset of nesting, nest location, the relationship between nest height and water depth, nest materials, and the structure and characteristics of Black Crowned Crane nests in the Lake Tana region, Ethiopia. A total of 52 nests were recorded in four wetlands from 2014 to 2015. Nesting activity predominantly took place from September to October. There was a significant difference in the distance from nests to the edge of the wetland (χ2 = 24.843, n = 46, df = 3, p < 0.001). However, in all study areas the distance between nests, which indicates the degree of territoriality, did not show any significant difference (χ2 = 6.016, n = 34, df = 3, p = 0.111). In addition, nests were constructed in the wetland where the water depth ranged from 80 to 220 cm. Nest height (H 2i) and water depth (WD i) at nesting sites were highly correlated, and the regression equation (H 2i = 13.77 + 1.03WD i) indicated that when the water depth increases, the nest height also increases. The shallowest depth where a nest was constructed was 80 cm. Vegetation type varied, but cranes used Leersia hexandra, Oryza longistaminata, and Cyprus rotundus plants as their selected nesting material. The average vegetation height observed at nests with eggs, measured one metre away from the nest rim, ranged from 20 to 90 cm (44.83 ± 2.397), n = 48. The vegetation height at each study site showed no significant difference (F (3) = 2.527, p = 0.07). The mean nest length, width, and height from the surface of the water between nests were not significantly different. Nesting density was variable depending on the size of the wetland, water depth, and vegetation type and cover. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png African Zoology Taylor & Francis

Nest characteristics and morphometry of Black Crowned Cranes Balearica pavonina ceciliae in Lake Tana area wetlands

Zelelew, Shimelis Aynalem; Archibald, George
African Zoology , Volume 56 (1): 7 – Jan 2, 2021
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Nest characteristics and morphometry of Black Crowned Cranes Balearica pavonina ceciliae in Lake Tana area wetlands

Abstract

Birds select breeding habitats based on biotic and abiotic environmental factors, resulting in a non-random spatial distribution of nests. This study investigated the onset of nesting, nest location, the relationship between nest height and water depth, nest materials, and the structure and characteristics of Black Crowned Crane nests in the Lake Tana region, Ethiopia. A total of 52 nests were recorded in four wetlands from 2014 to 2015. Nesting activity predominantly took place from...
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Publisher
Taylor & Francis
Copyright
© 2021 Zoological Society of Southern Africa
ISSN
2224-073X
eISSN
1562-7020
DOI
10.1080/15627020.2020.1850350
Publisher site
See Article on Publisher Site

Abstract

Birds select breeding habitats based on biotic and abiotic environmental factors, resulting in a non-random spatial distribution of nests. This study investigated the onset of nesting, nest location, the relationship between nest height and water depth, nest materials, and the structure and characteristics of Black Crowned Crane nests in the Lake Tana region, Ethiopia. A total of 52 nests were recorded in four wetlands from 2014 to 2015. Nesting activity predominantly took place from September to October. There was a significant difference in the distance from nests to the edge of the wetland (χ2 = 24.843, n = 46, df = 3, p < 0.001). However, in all study areas the distance between nests, which indicates the degree of territoriality, did not show any significant difference (χ2 = 6.016, n = 34, df = 3, p = 0.111). In addition, nests were constructed in the wetland where the water depth ranged from 80 to 220 cm. Nest height (H 2i) and water depth (WD i) at nesting sites were highly correlated, and the regression equation (H 2i = 13.77 + 1.03WD i) indicated that when the water depth increases, the nest height also increases. The shallowest depth where a nest was constructed was 80 cm. Vegetation type varied, but cranes used Leersia hexandra, Oryza longistaminata, and Cyprus rotundus plants as their selected nesting material. The average vegetation height observed at nests with eggs, measured one metre away from the nest rim, ranged from 20 to 90 cm (44.83 ± 2.397), n = 48. The vegetation height at each study site showed no significant difference (F (3) = 2.527, p = 0.07). The mean nest length, width, and height from the surface of the water between nests were not significantly different. Nesting density was variable depending on the size of the wetland, water depth, and vegetation type and cover.

Journal

African Zoology – Taylor & Francis

Published: Jan 2, 2021

Keywords: nest density; nest height; nest measurements; nesting material; water depth

References

  • Observation on the biology and ecology of cranes: Wattled Cranes Bugeranus carunculatus, Black-crowned cranes Balearica pavonina, and Eurasian Cranes Grus grus at Lake Tana, Ethiopia
  • The status of cranes in Africa in 2005
  • Distribution, structure and simulation modelling of the Wattled Crane population in the Marromeu Complex of the Zambezi Delta, Mozambique
  • Species factsheet: Balearica pavonina
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  • The Demoiselle Crane in the agricultural landscape of the Ukrainian steppe zone