幼い恐竜がコミュニティの構造と多様性に与える影響
Katlin Schroeder1, S Kathleen Lyons2, Felisa A Smith3
1Department of Biology, University of New Mexico, Albuquerque, NM 87131, USA. maguire@unm.edu.
Science (New York, N.Y.)
|February 26, 2021
まとめ
恐竜の群れは多様性に欠けていたのは 幼いメガテロポッドが メソカーニボアのニッチを占めていたからです このオントジェネティックニッチシフトは,メソゾーイク時代を通して恐竜のコミュニティ構造と多様性に影響を与えました.
科学分野:
- 古生物学
- エコロジー
- 進化生物学
背景:
- 恐竜はメソゾイク期の生物多様性を支配したが 種が豊富ではなかった.
- 卵の対称性により 恐竜の出生体重は15kg未満に制限され 成長と形態学的変化が顕著になった.
- 若い恐竜と 大人の恐竜の格差は コミュニティの構造と多様性に 影響を及ぼしたようです
研究 の 目的:
- コミュニティの構造と多様性に対する 恐竜のオントゲニスの影響を定量化する.
- 恐竜の群れに及ぼす影響について 地質学的な時間や大陸を横切って調査する
主な方法:
- 恐竜の群れは136万年 7つの大陸に広がった
- 特にメガテロポッドの体格の範囲とニッチの占有量の定量化
主要な成果:
- メガテロポッド (1000kg以上) は恐竜のコミュニティ構造に大きな影響を与えた.
- 草食動物は体のサイズが広い範囲を占めていたが,メガテロポッドの群れにはメソカーニバー (100-1000kg) が欠けていた.
- 幼いメガテロポッドがメソカーニボアのニッチを満たし,全体的な分類多様性を減少させた.
結論:
- 恐竜のオントジェネティックなニッチシフト,特にメガテロポッドは,コミュニティの構造を形作る上で重要な要因でした.
- 大きな捕食者の存在と そのオントゲネティックな発展は 恐竜の生態系の多様性に 影響した.
- この研究は,古生物学的な再構築において,生命の歴史戦略を考慮することの重要性を強調しています.
関連する概念動画
02:56The Fossil Record
26.5K
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
26.5K
02:55The Evidence for Evolution
45.9K
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
45.9K
01:39Keystone Species
23.2K
Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a...
23.2K
02:35What is Evolutionary History?
41.6K
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
41.6K
02:17Ecological Succession
20.6K
Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
20.6K
01:07Speciation Rates
22.1K
Overview
22.1K