ギルボアのデヴォン期中期の化石林で発見された驚くほど複雑なコミュニティ
William E Stein1, Christopher M Berry, Linda VanAller Hernick
1Department of Biological Sciences, Binghamton University, New York, NY 13902-6000, USA. stein@binghamton.edu
Nature
|March 3, 2012
まとめ
初期デボニアンの森林には,クラドキシロプシドやアヌロフィテリア系プロギムノスペルムを含む多様な樹種が特徴でした. この研究は,ギルボアの化石林を再評価し,複雑な生態学的相互作用と初期の樹木形成を明らかにしています.
科学分野:
- パレオボタニーは古植物学です.
- パレオエコロジー (Paleoecology) とは
- デボニアン期生態学 デボニアン期生態学
背景:
- デヴォン期中期の樹木の起源は,陸上の生態系と地球的なプロセスを大きく変えました.
- ニューヨークにあるギルボアの化石森林は,初期の森林生態学を理解するための重要な場所ですが,その解釈は限られています.
- 以前の研究では,ギルボアの遺跡はクラドキシロプシド (Eospermatopteris) が支配する単純な沼地であると解釈されていました.
研究 の 目的:
- 現代の方法を使用して,ギルボアの化石森林の古生態学を再評価する.
- この初期のデボニアン期の森林の構成と生態学的相互作用を明確にするために.
- アヌロフィタ系プロギムノスペルムとリコプシドの習慣と生態学的役割を調査する.
主な方法:
- ギルボアのRiverside Quarryで1200m2のエリアの発掘と地図作成.
- 化石の根系と関連する植物構造の詳細な分析 in situ.
- クラドキシロプシド,アネロフィタリアン,リコプシドを含む様々な植物群の識別と特徴付け.
主要な成果:
- 多数のEospermatopterisの根系を発見した.
- エオスペルマトポテリスの樹木の中で成長する木の根茎を持つ大きなアヌロフィタルのプロジムノスペルムの識別.
- ライコプシドの樹木形成の証拠は,その既知の範囲と生態学的重要性を拡大する.
- 根付く地平線は,根の浸透が限られている砂状の泥石で,湿地の沿岸平原の環境が干渉の対象であることを示しています.
結論:
- ギルボアの森は,以前考えられていたよりも複雑で,混合群の生態系でした.
- アネロフィタリアンは初期の森林の重要な構成要素であり,二面血管カンビウムによって生成された木材を所有していました.
- これらの発見は,初期の森林の古生態学に関する根本的な洞察を提供し,デボンの生態系を解釈するための世界的な意味合いを持っています.
関連する概念動画
Modern Molecular Taxonomy
574
Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
574
Diversity of Protists III
723
Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
723
Diversity of Protists IV
737
Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
737
The Fossil Record
27.0K
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...
27.0K
Robbers Cave
14.8K
During the 1950s, the landmark Robbers Cave experiment demonstrated that when groups must compete with one another, intergroup conflict, hostility, and even violence may result. At the Oklahoman summer camp, two troops of boys—termed the Rattlers and the Eagles—took part in a week-long tournament. During this time, their negativity culminated in derogatory name-calling, fistfights, and even vandalism and destruction of property. However, this work also revealed that such tension...
14.8K
Habitat Fragmentation
20.9K
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
20.9K


