海鳥は 侵襲的なネズミがいなくても 珊瑚礁の生産性と 機能性を高めます
Nicholas A J Graham1,2, Shaun K Wilson3,4, Peter Carr5,6
1Lancaster Environment Centre, Lancaster University, Lancaster, UK. nick.graham@lancaster.ac.uk.
Nature
|July 12, 2018
まとめ
侵襲的なネズミを島から排除することで 海鳥の個体数も増加し 珊瑚礁への栄養源の流れも増加します これはサンゴ礁の魚の成長や バイオマスや 牧草や生物浸食のような生態系の機能を 強化します
科学分野:
- 海洋生態学
- 島の生物地理
- 栄養素の循環
背景:
- バイオティック・コネクティビティは有機物質と栄養素を伝達し 生態系に影響を与えます
- 海鳥は海中の栄養を島に運び 陸地の生産性を高めます
- 付近のサンゴ礁への影響は不明です
研究 の 目的:
- 海鳥からの栄養補助が 珊瑚礁の生態系に どう影響するか調べる
- チャゴス諸島のラットにまみれた島とラットのない島を 比較する実験です
主な方法:
- ネズミがいない島と ネズミが多い島での海鳥の密度と窒素堆積の比較
- 陸生生物とサンゴ礁生物における安定性窒素同位体 (δ15N) の分析値
- 隣接するサンゴ礁の魚の成長,生物量,放牧,生物浸食率を測定した.
主要な成果:
- ネズミのいない島は海鳥の密度や 窒素の堆積量がかなり高かった.
- 陸生やサンゴ礁の生物の δ15N値上昇は,ネズミのない島で栄養補助が強化されたことを示した.
- ネズミのない島の近くのサンゴ礁は 魚の成長,バイオマス,放牧,生物浸食が増加しました
結論:
- 侵襲的なネズミは pelagic 島やサンゴ礁の生態系間の 栄養の流れを乱します
- ネズミの根絶は陸上と海洋の生態系の健康を回復するために不可欠です
- サンゴ礁の生産性と機能が向上します
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