平成 27 年度
石西礁湖自然再生事業評価手法検討等業務

報告書

平成 28 年 3 月

環境省九州地方環境事務所那覇自然環境事務所
日本工営

株

式会社

目

次

1.業務概要 ···························································· 1-1
1.1

業務目的 ······················································· 1-1

1.2

業務対象地域 ··················································· 1-1

1.3

業務概要 ······················································· 1-11.4

業務内容 ······················································· 1-31.4.1

実施内容 ··················································· 1-3(1) 過年度事業データの整理 ······································ 1-3(2) 国内外の自然再生事業等に関する事例収集 ······················ 1-5(3) 平成 27 年度石西礁湖自然再生協議会学術調査ワーキンググループの資料作成及び発表
補助 ························································ 1-51.4.21.5

業務実施体制 ··············································· 1-5

実施概要 ······················································· 1-6

2.過年度事業データの整理 ············································ 2.1-12.1

収集資料一覧 ················································· 2.1-12.1.1

環境省事業 ··············································· 2.1-12.1.2

環境省事業以外の事業 ····································· 2.1-42.2

収集資料の概要 ··············································· 2.2-1

2.3

収集資料の整理 ············································· 2.3.1-12.3.1

資料の整理方法 ········································· 2.3.1-1

2.3.2

モニタリングサイト 1000 ································· 2.3.2-1(1)データシートの作成 ······································· 2.3.2-1(2)表作成 ··················································· 2.3.2-7(3)地図作成 ················································ 2.3.2-17(4)グラフ作成 ·············································· 2.3.2-55
2.3.3

サンゴ群集モニタリング調査 ····························· 2.3.3-1(1)データシートの作成 ······································· 2.3.3-1(2)表作成 ··················································· 2.3.3-3(3)地図作成 ················································ 2.3.3-48(4)グラフ作成 ·············································· 2.3.3-50
2.3.4 移植サンゴモニタリング調査 ····························· 2.3.4-1(1)データシートの作成 ······································· 2.3.4-1(2)表作成 ··················································· 2.3.4-3(3)地図作成 ················································· 2.3.4-5(4)グラフ作成 ··············································· 2.3.4-7

2.3.5

オニヒトデ駆除数 ······································· 2.3.5-1(1)データシートの作成 ······································· 2.3.5-1(2)表作成 ··················································· 2.3.5-1(3)地図作成 ················································ 2.3.5-24(4)グラフ作成 ·············································· 2.3.5-262.3.6撹乱要因モニタリング調査 ······························· 2.3.6-1(1)データシートの作成 ······································· 2.3.6-1(2)表作成 ··················································· 2.3.6-4(3)地図作成 ················································· 2.3.6-9(4)グラフ作成 ·············································· 2.3.6-112.3.7

サンゴ被度分布調査 ····································· 2.3.7-1(1)データシートの作成 ······································· 2.3.7-1(2)表作成 ··················································· 2.3.7-2(3)地図作成 ················································· 2.3.7-2(4)グラフ作成 ··············································· 2.3.7-6
2.3.8

各種事業データの関係性 ································· 2.3.8-1(1)サンゴ被度とオニヒトデ、地形、生育型との関係性 ··········· 2.3.8-1(2)オニヒトデ駆除とサンゴ被度の関係① ······················· 2.3.8-6(3)オニヒトデ駆除とサンゴ被度の関係② ······················ 2.3.8-10
2.4「展開すべき取組」に沿った整理 ······························· 2.4-1

2.4.1

撹乱要因の除去 ··········································· 2.4-1(1) オニヒトデ等による食害及び病気への対応 ···················· 2.4-1(2) 赤土等流出防止対策 ······································· 2.4-16(3) 排水等対策 ··············································· 2.4-302.4.2

良好な環境創成 ·········································· 2.4-61(1) サンゴ礁生態系の再生 ····································· 2.4-61(2) 沿岸域の生態系の再生 ····································· 2.4-673.国内外の自然再生事業等に関する事例収集 ···························· 3.1-1
3.1

自然再生事業に係る事例調査 ··································· 3.1-1

3.2

サンゴ礁生態系の再生に関する国内外の評価事例 ················· 3.2-1

3.2.1

撹乱要因について ········································· 3.2-2(1) オニヒトデ対策 ············································ 3.2-2(2) サンゴの病気 ············································· 3.2-16(3) 陸域からの土砂・栄養塩等負荷対策 ························· 3.2-33(4) サンゴ礁の白化現象 ······································· 3.2-46
3.2.2

自然再生と生態系評価について ···························· 3.2-55(1) 移植によるサンゴ礁の再生 ································· 3.2-55

(2) サンゴ礁生態系 ··········································· 3.2-59
4.平成 27 年度石西礁湖自然再生協議会学術調査ワーキンググループの資料作成及び発表補助······································································ 4-1
5.評価手法検討を進める上での課題 ······································ 5-15.1

事業評価に向けての今後の展開について ··························· 5-1

5.2

評価指標の検討を進めていく上での情報不足 ······················· 5-25.3

評価指標の考え方について ······································· 5-6