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急速な進化を示唆する成熟傾向は,北部のの崩壊に先行した
Esben M Olsen1, Mikko Heino, George R Lilly
1Adaptive Dynamics Network, International Institute for Applied Systems Analysis, A-2361 Laxenburg, Austria. espeom@bio.uio.no
Nature
|May 1, 2004
まとめ
漁業によって引き起こされた進化により,北部のトード (Gadus morhua) は,人口が崩壊する前に,より早く,より小さなサイズで成熟した. この生命史の変化は,人口の変化を早期に検出するための新しい漁業管理ツールの必要性を示唆しています.
科学分野:
- 漁業科学 漁業科学 漁業科学
- 進化生物学の進化生物学について
- 人口の動態
背景:
- 北部トード (Gadus morhua) は,何世紀にもわたって主要な漁業を支えてきましたが,1990年代初頭には崩壊しました.
- 漁業のモラトリアムにもかかわらず,北部の魚の個体数は歴史的に低い水準にとどまっている.
研究 の 目的:
- 1992年の漁業停止前における北部のトード群の生命史の変化を調査する.
- 観察された成熟のシフトが,漁業によって引き起こされた進化によって引き起こされたかどうかを判断するために.
主な方法:
- 熟成のタイミングとサイズの変化を追跡するために,過去の漁業データの分析.
- 死亡率や表型可塑性などの混同要因を考慮する統計的方法.
- 観察された生命史の変化と,漁業による進化の理論的予測を比較する.
主要な成果:
- 北部トークの個体群は,モラトリオムの前のより早い年齢で成熟し,より小さなサイズに向かって一貫した傾向を示しました.
- これらの変化は統計的に有意であり,他の生態学的要因をコントロールした後も持続しました.
- 観察された進化の軌道は,魚の生命史に対する漁業圧力の理論的モデルと一致しています.
結論:
- 漁業の搾取は,おそらく,北部のバケツの成熟パターンの進化的変化を促した.
- この研究は,強烈な漁業プレッシャーに対応して急速な進化の可能性を強調しています.
- 提案された分析方法は,漁業管理者にとって,有害な生命史のシフトを検出するための早期警告システムとして機能することができる.
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