Impact Assessment
Online ISSN : 2424-2268
Print ISSN : 1348-1819
Volume 16 , Issue 1
Showing 1-19 articles out of 19 articles from the selected issue
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Original Paper
  • Yukinori NAKANE, Masaki HONDA, Seiya ABE, Toshimitsu NUKA, Kazuyuki HA ...
    2018 Volume 16 Issue 1 Pages 56-63
    Published: February 20, 2018
    Released: August 30, 2018

    The objective of this study was to develop a method for assessing tidal flat ecosystems. We focused on crab-feeding birds, the top predator on tidal flats. Distribution of mud flat crabs is generally affected by substrate conditions, such as grain size and soil water content. Therefore, habitat suitability for crabs is likely able to be evaluated by measuring substrate condition. We documented the distribution of the burrowing crab Macrophthalmus japonicas, and developed two Habitat Suitability Index (HSI) models based on 1) the number of crabs and 2) their burrows. Scores of the two HSI models for the crab were both correlated with the number of individuals of two crab-feeding snipes (Heteroscelus brevipes and Numenius phaeopus). Our results suggest that the distribution of crab-feeding birds can be assessed based on habitat suitability for their prey.

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  • Takashi YAMAZAKI, Akira SASE, Akiyoshi NARITA, Shigenori SAITO, Shouic ...
    2018 Volume 16 Issue 1 Pages 64-76
    Published: February 20, 2018
    Released: August 30, 2018

    The discharge of the Kitakami River fluctuates very sharply, from just a few m3 / sec during dry periods to about 4000 m3 / sec following a typhoon. During times of drought or extended dry periods the water in the estuarine area becomes oxygen-deficient., which adversely affects the Yamato-shijimi; heavy flows from the Kitakami River also have an impact on the cultivation of marine species in Oppa Bay.This report describes how we used numerical simulation models and observations of currents, water temperature, DO, salinity, SS etc., to estimate the influence of the river flow during periods of heavy flow and the reduction in oxygen-deficiency attributable to the diversion facility.

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