地元での適応は,世界規模で海の女性化を緩和する助けとなる
Jared J Tromp1, Melissa N Staines1, Jacques-Olivier Laloë1
1Deakin Marine Research and Innovation Centre, School of Life and Environmental Sciences, Deakin University, Geelong, Victoria, Australia.
Global change biology
|August 29, 2025
まとめ
海洋カメは温暖化に適応するかもしれない. 化温度における局所的な適応は 雄の幼生を産み出し 集団の回復力を高めます
科学分野:
- 海洋生物学
- 気候変動 エコロジー
- 保護科学
背景:
- 気候変動は,特に適応能力が限られている種にとって,絶滅の危険性をもたらします.
- 海のカメは温度によって性別が決まるので 温度の上昇によりメスが多くなり 集団の女性化につながる可能性があります
- 以前の研究では 気候の温暖化が 巣づくりの変化による 海のカメの適応を上回る可能性があることが示されました
研究 の 目的:
- 温度の上昇に適応する海の能力を評価する.
- 化条件と関連して世界の海の化性比とピボタル温度を分析する.
主な方法:
- 海洋カメの7種と全ての海域で 公開された138種の卵子の性別比率を分析した結果です
- 温暖な場所への局所的な適応を評価するために,世界的に記録された33のピボタル温度を調査した.
- 観察された性別比率と,温度に依存した一般的な性別決定モデルを比較する.
主要な成果:
- 一般的なモデルで予測されたより低い割合の雌の雛が生まれた.
- 分析により,より暖かい場所では一般的により高いピボタル温度が確認され,局所的な適応が示されました.
- 観察された性比は,これまで考えられていたよりも,気候変動に対する抵抗力が高いことを示唆している.
結論:
- 海のカメは,ピボタルな温度で局所的な適応を示し,それはハッキリした性別比率に影響を与えます.
- この適応は,より暖かい環境で雄の雛の産生を促進し,集団の存続を支える可能性があります.
- 海洋カメの産卵性比率は 予想以上に 気候変動への抵抗力があるようです
関連する概念動画
Conservation of Declining Populations
9.7K
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
9.7K
Conservation of Small Populations
13.5K
Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
13.5K
Types of Selection
41.4K
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
41.4K
Frequency-dependent Selection
22.2K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
22.2K
Background and Environment Affect Phenotype
6.7K
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
6.7K
Adaptations that Reduce Water Loss
26.3K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
26.3K


