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Patterning limnological characteristics of the Chilika lagoon (India) using a self-organizing map

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Abstract

In this study, a self-organizing map (SOM) was utilized to classify habitats in the Chilika lagoon located in India, the largest lagoon ecosystem in Asia (maximum length, 64.3 km; mean width, 20.1 km). The lagoon was marginally eutrophic (nitrate, 0.25 ± 0.22 mg L−1; orthophosphate, 0.26 ± 0.22 mg L−1; n = 1,980, respectively) for six years (1999–2004), and it used to be warm, shallow, turbid and predominantly brackish. The SOM model successfully identified the changing patterns of limnology in the lagoon using the monthly limnological dataset from 30 study sites (July 1999–December 2004). Comparative re-sectoring evaluation of current monitoring sites was accomplished based on the outcome of the modeling. The new site clustering that emerged from the model was similar to conventional ones, and several sites were reorganized. Water physicochemistry was affected by freshwater inflow during monsoon and the new lagoon mouth constructed in September 2000, which resulted in variations in site characteristics in terms of limnology. The results of this study may provide information on the limnological patterns in Chilika lagoon, and they leave room for further study into functional changes in the lagoon ecology with respect to changes in climatic factor, freshwater flow and lagoon morphology.

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Acknowledgments

This work was supported by the LTER Project from the Ministry of the Environment in South Korea. The authors deeply appreciate Dr. Sovan Lek at the Universitie Paul Sabatier, France, for his courtesy of providing an efficient SOM coding solution, which was utilized throughout the entire analysis in this study. We also wish to thank the personnel in the Chilika Development Authority who were involved in collecting a large set of data from the Chilika lagoon. Most of this work was conducted during the appointment of the postdoctoral fellowship of K.S. Jeong (PNU 2006).

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  1. Department of Biology, Pusan National University, Jang-Jeon Dong, Gum-Jeong Gu, Busan, 609-735, South Korea

    Kwang-Seuk Jeong, Dong-Kyun Kim, Bishnu Bhandari & Gea-Jae Joo

  2. Chilika Development Authority, Bhubaneswar, India

    Ajit Pattnaik & Krupasindhu Bhatta

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  1. Kwang-Seuk Jeong
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  2. Dong-Kyun Kim
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  3. Ajit Pattnaik
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  4. Krupasindhu Bhatta
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  6. Gea-Jae Joo
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Correspondence to Bishnu Bhandari.

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Jeong, KS., Kim, DK., Pattnaik, A. et al. Patterning limnological characteristics of the Chilika lagoon (India) using a self-organizing map. Limnology 9, 231–242 (2008). https://doi.org/10.1007/s10201-008-0243-7

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