A Study on the Occurrence Probability determined by environmental factors of Macrobenthos on Korean tidal flat

Abstract

Large gaps exist between modeling results and in-situ data of macrobenthos in tidal flat.Data predicting where macrobenthos are likely to occur along environmental gradients are important for the conservation and management. To calculate occurrence probability, we used presence/absence data from field surveys of four study sites in five periods and a statisticalanalysis to estimate the occurrence probability of dominant five species of macrobenthos Ilyoplax pingi, Macrophthalmus japonicas, Macrophthalmus dilatatus, Mactra veneriformis,and Ruditapes philippinarum. Applied environmental factors which are significantly affectedto inhabitation of macrobenthos were sand composition of sediment and exposure ranges, andwere subdivided into five characteristics of habitat, respectively. Estimates of occurrenceprobabilities differed substantially between species and were influenced by the sandcomposition and by the continuous exposure. The effects of these two factors were notequivalent across species. Overall average accuracy of high occurrence probability of fivespecies (range = 0.6-1.0) were 61.2 ± 13.0%. Our results demonstrate that the statisticalanalysis was successfully estimated occurrence with two significant environmental factorsand will be useful for management activities in Korean tidal flat.occurrence probability, we used presence/absence data from field surveys of four study sites in five periods and a statisticalanalysis to estimate the occurrence probability of dominant five species of macrobenthos Ilyoplax pingi, Macrophthalmus japonicas, Macrophthalmus dilatatus, Mactra veneriformis,and Ruditapes philippinarum. Applied environmental factors which are significantly affectedto inhabitation of macrobenthos were sand composition of sediment and exposure ranges, andwere subdivided into five characteristics of habitat, respectively. Estimates of occurrenceprobabilities differed substantially between species and were influenced by the sandcomposition and by the continuous exposure. The effects of these two factors were notequivalent across species. Overall average accuracy of high occurrence probability of fivespecies (range = 0.6-1.0) were 61.2 ± 13.0%. Our results demonstrate that the statisticalanalysis was successfully estimated occurrence with two significant environmental factorsand will be useful for management activities in Korean tidal flat.