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Effect of human-induced environmental changes on bird diversity and abundance in natural wetlands of Southwest Ethiopia

Selamawit Negassa Chawaka (UGent) , Seid Tiku Mereta (UGent) , Peter Goethals (UGent) , Luc Lens (UGent) and Pieter Boets (UGent)
(2017) WATERBIRDS. 40(2). p.129-143
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Abstract
The diversity and abundance of wetland birds have been threatened by increasing anthropogenic activities during recent decades. The objective of this study was to determine the effect of human-induced disturbance on bird species richness and abundance of natural wetlands in southwest Ethiopia. Bird surveys were performed at 56 locations during both the wet and dry seasons in 2010 and 2011. Generalized linear modeling (G) was used to correlate species richness with environmental variables. It was found that wetlands with low human disturbance were characterized by a higher richness (n > 10) of wetland dependent specialist birds (depending completely on wetlands for food and nesting) than the highly disturbed wetlands. However, for wetland-associated birds (those able to nest and feed in wetlands as well as in other habitats), there was no significant difference (P = 0.31) in species richness between disturbed and non-disturbed wetlands. The abundance of wetland dependent specialist birds was significantly affected (P < 0.001) by human disturbance, whereas the abundance of wetland associated birds was not (P = 0.39). Fifty-three percent of the variation in species richness of wetland dependent birds was explained by a combination of water depth, sludge depth, conductivity, chlorophyll a, total phosphorus, human disturbance and vegetation cover. It is recommended that anthropogenic activities should be minimized and controlled in and around these wetlands to conserve biodiversity.
Keywords
abundance, generalized linear model, human disturbance, species richness, wetland-associated birds, wetland-dependent birds, wetlands, SPECIES COMPOSITION, RIVER FLOODPLAIN, WATER DEPTH, LAND-USE, HABITAT, COMMUNITIES, CONSERVATION, MANAGEMENT, MACROINVERTEBRATE, INDICATORS

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Chicago
Chawaka, Selamawit Negassa, Seid Tiku Mereta, Peter Goethals, Luc Lens, and Pieter Boets. 2017. “Effect of Human-induced Environmental Changes on Bird Diversity and Abundance in Natural Wetlands of Southwest Ethiopia.” Waterbirds 40 (2): 129–143.
APA
Chawaka, S. N., Mereta, S. T., Goethals, P., Lens, L., & Boets, P. (2017). Effect of human-induced environmental changes on bird diversity and abundance in natural wetlands of Southwest Ethiopia. WATERBIRDS, 40(2), 129–143.
Vancouver
1.
Chawaka SN, Mereta ST, Goethals P, Lens L, Boets P. Effect of human-induced environmental changes on bird diversity and abundance in natural wetlands of Southwest Ethiopia. WATERBIRDS. 2017;40(2):129–43.
MLA
Chawaka, Selamawit Negassa, Seid Tiku Mereta, Peter Goethals, et al. “Effect of Human-induced Environmental Changes on Bird Diversity and Abundance in Natural Wetlands of Southwest Ethiopia.” WATERBIRDS 40.2 (2017): 129–143. Print.
@article{8530570,
  abstract     = {The diversity and abundance of wetland birds have been threatened by increasing anthropogenic activities during recent decades. The objective of this study was to determine the effect of human-induced disturbance on bird species richness and abundance of natural wetlands in southwest Ethiopia. Bird surveys were performed at 56 locations during both the wet and dry seasons in 2010 and 2011. Generalized linear modeling (G) was used to correlate species richness with environmental variables. It was found that wetlands with low human disturbance were characterized by a higher richness (n {\textrangle} 10) of wetland dependent specialist birds (depending completely on wetlands for food and nesting) than the highly disturbed wetlands. However, for wetland-associated birds (those able to nest and feed in wetlands as well as in other habitats), there was no significant difference (P = 0.31) in species richness between disturbed and non-disturbed wetlands. The abundance of wetland dependent specialist birds was significantly affected (P {\textlangle} 0.001) by human disturbance, whereas the abundance of wetland associated birds was not (P = 0.39). Fifty-three percent of the variation in species richness of wetland dependent birds was explained by a combination of water depth, sludge depth, conductivity, chlorophyll a, total phosphorus, human disturbance and vegetation cover. It is recommended that anthropogenic activities should be minimized and controlled in and around these wetlands to conserve biodiversity.},
  author       = {Chawaka, Selamawit Negassa and Mereta, Seid Tiku and Goethals, Peter and Lens, Luc and Boets, Pieter},
  issn         = {1524-4695},
  journal      = {WATERBIRDS},
  keyword      = {abundance,generalized linear model,human disturbance,species richness,wetland-associated birds,wetland-dependent birds,wetlands,SPECIES COMPOSITION,RIVER FLOODPLAIN,WATER DEPTH,LAND-USE,HABITAT,COMMUNITIES,CONSERVATION,MANAGEMENT,MACROINVERTEBRATE,INDICATORS},
  language     = {eng},
  number       = {2},
  pages        = {129--143},
  title        = {Effect of human-induced environmental changes on bird diversity and abundance in natural wetlands of Southwest Ethiopia},
  url          = {http://dx.doi.org/10.1675/063.040.0205},
  volume       = {40},
  year         = {2017},
}

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