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Generalized linear models to identify key hydromorphological and chemical variables determining the occurrence of macroinvertebrates in the Guayas River Basin (Ecuador)

(2016) WATER. 8(7).
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Abstract
The biotic integrity of the Guayas River basin in Ecuador is at environmental risk due to extensive anthropogenic activities. We investigated the potential impacts of hydromorphological and chemical variables on biotic integrity using macroinvertebrate-based bioassessments. The bioassessment methods utilized included the Biological Monitoring Working Party adapted for Colombia (BMWP-Col) and the average score per taxon (ASPT), via an extensive sampling campaign that was completed throughout the river basin at 120 sampling sites. The BMWP-Col classification ranged from very bad to good, and from probable severe pollution to clean water based on the ASPT scores. Generalized linear models (GLMs) and sensitivity analysis were used to relate the bioassessment index to hydromorphological and chemical variables. It was found that elevation, nitrate-N, sediment angularity, logs, presence of macrophytes, flow velocity, turbidity, bank shape, land use and chlorophyll were the key environmental variables affecting the BMWP-Col. From the analyses, it was observed that the rivers at the upstream higher elevations of the river basin were in better condition compared to lowland systems and that a higher flow velocity was linked to a better BMWP-Col score. The nitrate concentrations were very low in the entire river basin and did not relate to a negative impact on the macroinvertebrate communities. Although the results of the models provided insights into the ecosystem, cross fold model development and validation also showed that there was a level of uncertainty in the outcomes. However, the results of the models and sensitivity analysis can support water management actions to determine and focus on alterable variables, such as the land use at different elevations, monitoring of nitrate and chlorophyll concentrations, macrophyte presence, sediment transport and bank stability.
Keywords
biotic integrity management, Guayas River basin, bioassessments, generalized linear models, sensitivity analysis, ECOLOGICAL WATER-QUALITY, NEURAL-NETWORK MODELS, LAND-USE, BENTHIC MACROINVERTEBRATES, SPECIES DISTRIBUTIONS, AGRICULTURAL STREAMS, HABITAT SUITABILITY, POLISH CARPATHIANS, MULTIMETRIC INDEX, SPATIAL SCALES

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MLA
Damanik Ambarita, Minar Naomi, et al. “Generalized Linear Models to Identify Key Hydromorphological and Chemical Variables Determining the Occurrence of Macroinvertebrates in the Guayas River Basin (Ecuador).” WATER, vol. 8, no. 7, 2016, doi:10.3390/w8070297.
APA
Damanik Ambarita, M. N., Everaert, G., Forio, M. A. E., Nguyen, T. H. T., Lock, K., Musonge, P. S. L., … Goethals, P. (2016). Generalized linear models to identify key hydromorphological and chemical variables determining the occurrence of macroinvertebrates in the Guayas River Basin (Ecuador). WATER, 8(7). https://doi.org/10.3390/w8070297
Chicago author-date
Damanik Ambarita, Minar Naomi, Gert Everaert, Marie Anne Eurie Forio, Thi Hanh Tien Nguyen, Koen Lock, Peace Sasha Liz Musonge, Natalija Suhareva, et al. 2016. “Generalized Linear Models to Identify Key Hydromorphological and Chemical Variables Determining the Occurrence of Macroinvertebrates in the Guayas River Basin (Ecuador).” WATER 8 (7). https://doi.org/10.3390/w8070297.
Chicago author-date (all authors)
Damanik Ambarita, Minar Naomi, Gert Everaert, Marie Anne Eurie Forio, Thi Hanh Tien Nguyen, Koen Lock, Peace Sasha Liz Musonge, Natalija Suhareva, Luis Dominguez-Granda, Elina Bennetsen, Pieter Boets, and Peter Goethals. 2016. “Generalized Linear Models to Identify Key Hydromorphological and Chemical Variables Determining the Occurrence of Macroinvertebrates in the Guayas River Basin (Ecuador).” WATER 8 (7). doi:10.3390/w8070297.
Vancouver
1.
Damanik Ambarita MN, Everaert G, Forio MAE, Nguyen THT, Lock K, Musonge PSL, et al. Generalized linear models to identify key hydromorphological and chemical variables determining the occurrence of macroinvertebrates in the Guayas River Basin (Ecuador). WATER. 2016;8(7).
IEEE
[1]
M. N. Damanik Ambarita et al., “Generalized linear models to identify key hydromorphological and chemical variables determining the occurrence of macroinvertebrates in the Guayas River Basin (Ecuador),” WATER, vol. 8, no. 7, 2016.
@article{8043882,
  abstract     = {{The biotic integrity of the Guayas River basin in Ecuador is at environmental risk due to extensive anthropogenic activities. We investigated the potential impacts of hydromorphological and chemical variables on biotic integrity using macroinvertebrate-based bioassessments. The bioassessment methods utilized included the Biological Monitoring Working Party adapted for Colombia (BMWP-Col) and the average score per taxon (ASPT), via an extensive sampling campaign that was completed throughout the river basin at 120 sampling sites. The BMWP-Col classification ranged from very bad to good, and from probable severe pollution to clean water based on the ASPT scores. Generalized linear models (GLMs) and sensitivity analysis were used to relate the bioassessment index to hydromorphological and chemical variables. It was found that elevation, nitrate-N, sediment angularity, logs, presence of macrophytes, flow velocity, turbidity, bank shape, land use and chlorophyll were the key environmental variables affecting the BMWP-Col. From the analyses, it was observed that the rivers at the upstream higher elevations of the river basin were in better condition compared to lowland systems and that a higher flow velocity was linked to a better BMWP-Col score. The nitrate concentrations were very low in the entire river basin and did not relate to a negative impact on the macroinvertebrate communities. Although the results of the models provided insights into the ecosystem, cross fold model development and validation also showed that there was a level of uncertainty in the outcomes. However, the results of the models and sensitivity analysis can support water management actions to determine and focus on alterable variables, such as the land use at different elevations, monitoring of nitrate and chlorophyll concentrations, macrophyte presence, sediment transport and bank stability.}},
  articleno    = {{297}},
  author       = {{Damanik Ambarita, Minar Naomi and Everaert, Gert and Forio, Marie Anne Eurie and Nguyen, Thi Hanh Tien and Lock, Koen and Musonge, Peace Sasha Liz and Suhareva, Natalija and Dominguez-Granda, Luis and Bennetsen, Elina and Boets, Pieter and Goethals, Peter}},
  issn         = {{2073-4441}},
  journal      = {{WATER}},
  keywords     = {{biotic integrity management,Guayas River basin,bioassessments,generalized linear models,sensitivity analysis,ECOLOGICAL WATER-QUALITY,NEURAL-NETWORK MODELS,LAND-USE,BENTHIC MACROINVERTEBRATES,SPECIES DISTRIBUTIONS,AGRICULTURAL STREAMS,HABITAT SUITABILITY,POLISH CARPATHIANS,MULTIMETRIC INDEX,SPATIAL SCALES}},
  language     = {{eng}},
  number       = {{7}},
  pages        = {{23}},
  title        = {{Generalized linear models to identify key hydromorphological and chemical variables determining the occurrence of macroinvertebrates in the Guayas River Basin (Ecuador)}},
  url          = {{http://dx.doi.org/10.3390/w8070297}},
  volume       = {{8}},
  year         = {{2016}},
}

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