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関連する概念動画

Migration00:53

Migration

Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
Keystone Species01:39

Keystone Species

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 pivotal role in the...
Conservation of Declining Populations02:07

Conservation of Declining Populations

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.
Cranial Bones: Superior and Posterior View01:14

Cranial Bones: Superior and Posterior View

The superior view of the cranium shows the frontal and paired parietal bones.
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
Tooth Anatomy01:21

Tooth Anatomy

The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.

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関連する実験動画

Updated: Jul 6, 2026

Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid
09:09

Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid

Published on: August 8, 2017

大西洋大陸棚の象牙です.

F C Whitmore, K O Emery, H B Cooke

    Science (New York, N.Y.)
    |June 16, 1967
    PubMed
    まとめ

    マストドンやマモスの歯の化石が大陸棚で見つかり,大型の哺乳類が2万5千年前,海面が低い時期にこの地域に生息していたことを示している. これらの発見には,水没した海岸線と古代の有機堆積物が含まれる.

    科学分野:

    • パレオントロジー・パレオントロジー
    • 地質学 地質学 地質学
    • マリン・バイオロジー マリン・バイオロジー

    背景:

    • 大陸シェルフには,過去の環境と動物の証拠が含まれています.
    • 水中に潜った地質学的および生物学的特徴は,海面の変化についての洞察を提供します.

    研究 の 目的:

    • プレイストセンのメガファウナの存在を大陸棚に記録する.
    • 最後の氷河期におけるパレオ環境条件を再構築する.

    主な方法:

    • 漁師によって回収された化石の残骸 (マストドンとマモスの歯) の分析.
    • 沈没した大陸棚の地質・生物学的調査.

    主要な成果:

    • 40以上の遺跡でマストドンやマモスの歯が発見されており,深さ120mの遺跡もある.
    • 関連する発見には,水没した海岸線,泥炭堆積物,湖の貝殻,遺跡の砂などがあります.
    • 証拠によると,大型の哺乳類は,最後の氷河期 (低海平面) にこの地域に住んでいたことを示しています.

    結論:

    • 大陸棚は,プレイストセーン時代に大型哺乳類集団を支えた陸上の環境でした.

    さらに関連する動画

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    Environmental DNA Sampling from Whale-Watching Vessels for Cetacean Monitoring
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    Environmental DNA Sampling from Whale-Watching Vessels for Cetacean Monitoring

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    関連する実験動画

    Last Updated: Jul 6, 2026

    Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid
    09:09

    Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid

    Published on: August 8, 2017

    Using Archival Japanese Paper and Thermoplastic Resins to Prepare Fossils for Storage, Display, Transport, and Radiography
    07:30

    Using Archival Japanese Paper and Thermoplastic Resins to Prepare Fossils for Storage, Display, Transport, and Radiography

    Published on: November 14, 2025

    Environmental DNA Sampling from Whale-Watching Vessels for Cetacean Monitoring
    08:07

    Environmental DNA Sampling from Whale-Watching Vessels for Cetacean Monitoring

    Published on: April 10, 2026

  • 海平面の変動は,水没した風景とそれらの化石記録に大きく影響を与えました.