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- W3126171301 abstract "Primary production is the most important functional feature of terrestrial and aquatic ecosystems affecting many processes. In this study, we integrated logistic regression and Markov chain to predict chlorophyll-a (chl-a) concentration as an index of primary production in the Caspian Sea. We categorized the continuous variable, chl-a, using quantile method for analysis and prediction. Remotely-sensed data of chl-a and nine environmental variables were downloaded from MODIS dataset for the years 2013 and 2016. The level of chl-a in 2019 was predicted across the Caspian Sea. Chl‑a data was divided into three distinct levels (i.e. low, medium and high) based on 0.33 and 0.67 quantiles, and a logistic regression model was used based on transition between the levels of chl-a between 2013 and 2016, and between 2016 and 2019. The Markov chain modelling indicated an increasing trend in chl-a levels (low to medium, low to high, medium to high) for some parts of the Caspian Sea, and also a stable condition for other parts including transition from medium to medium, high to high had the highest transition probabilities for both periods. From 2013 to 2019, the calculated areas of the pixels having low levels of chl-a decreased and there were considerable increases in the areas with medium and high chl‑a levels. Accordingly, the chl-a level in the Caspian Sea at 2019 was predicted to be higher than those of the previous years, especially in the middle and southern parts of the Sea." @default.
- W3126171301 created "2021-02-15" @default.
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- W3126171301 date "2020-08-01" @default.
- W3126171301 modified "2023-09-23" @default.
- W3126171301 title "Spatiotemporal prediction of chlorophyll-a concentration in the Caspian Sea using logistic regression and Markov chain" @default.
- W3126171301 doi "https://doi.org/10.22069/ijerr.2020.5280" @default.
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