View in EDS PDF Full Text

Evolution's Witness : How Eyes Evolved

Saved in:
Bibliographic Details
Title: Evolution's Witness : How Eyes Evolved
Description: With predation and carnivory as catalysts, the first known eye appeared in a trilobite during the Cambrian explosion approximately 543 million years ago. This period was a crucible of evolution and teemed with anatomic creativity although the journey to formed vision actually began billions of years before that. The Cambrian period, however, spawned nearly all morphologic forms of the eye, followed by descent over hundreds of millions of years providing an unimaginable variety of eyes with at least ten different designs. Some eyes display spectacular creativity with mirror, scanning or telephoto optics. Some of these ocular designs are merely curiosities, while others offer the finest visual potential packed into a small space, limited only by the laws of diffraction or physiological optics. For example, some spiders developed tiny, well-formed eyes with scanning optics and three visual pigments; scallops have 40-100 eyes circling their mantle, each of which has mirror optics and contains two separate retinae per eye; deep ocean fish have eyes shaped like tubes containing yellow lenses to break camouflage; and some birds have vision five times better than ours; but this is only part of the story. Each animal alive today has an eye that fits is niche perfectly demonstrating the intimacy of the evolutionary process as no other organ could. The evolution of the eye is one of the best examples of Darwinian principles. Although few eyes fossilize in any significant manner, many details of this evolution are known and understood. From initial photoreception 3.75 billion years ago to early spatial recognition in the first cupped eyespot in Euglena to fully formed camera style eyes the size of beach balls in ichthyosaurs, animals have processed light to compete and survive in their respective niches. It is evolution's greatest gift and its greatest triumph. This is the story of the evolution of the eye.
Authors: Ivan R Schwab
Resource Type: eBook.
Subjects: Anatomy, Comparative, Adaptation (Biology), Eye--Evolution, Evolution (Biology)
Categories: MEDICAL / Ophthalmology, SCIENCE / Life Sciences / Evolution
Database: eBook Collection (EBSCOhost)
FullText Links:
  – Type: ebook-pdf
Text:
  Availability: 0
Header DbId: nlebk
DbLabel: eBook Collection (EBSCOhost)
An: 1632916
RelevancyScore: 1044
AccessLevel: 6
PubType: eBook
PubTypeId: ebook
PreciseRelevancyScore: 1044.26904296875
IllustrationInfo
ImageInfo – Size: thumb
  Target: https://rps2images.ebscohost.com/rpsweb/othumb?id=NL$1632916$PDF&s=r
– Size: medium
  Target: https://rps2images.ebscohost.com/rpsweb/othumb?id=NL$1632916$PDF&s=d
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Evolution's Witness : How Eyes Evolved
– Name: Abstract
  Label: Description
  Group: Ab
  Data: With predation and carnivory as catalysts, the first known eye appeared in a trilobite during the Cambrian explosion approximately 543 million years ago. This period was a crucible of evolution and teemed with anatomic creativity although the journey to formed vision actually began billions of years before that. The Cambrian period, however, spawned nearly all morphologic forms of the eye, followed by descent over hundreds of millions of years providing an unimaginable variety of eyes with at least ten different designs. Some eyes display spectacular creativity with mirror, scanning or telephoto optics. Some of these ocular designs are merely curiosities, while others offer the finest visual potential packed into a small space, limited only by the laws of diffraction or physiological optics. For example, some spiders developed tiny, well-formed eyes with scanning optics and three visual pigments; scallops have 40-100 eyes circling their mantle, each of which has mirror optics and contains two separate retinae per eye; deep ocean fish have eyes shaped like tubes containing yellow lenses to break camouflage; and some birds have vision five times better than ours; but this is only part of the story. Each animal alive today has an eye that fits is niche perfectly demonstrating the intimacy of the evolutionary process as no other organ could. The evolution of the eye is one of the best examples of Darwinian principles. Although few eyes fossilize in any significant manner, many details of this evolution are known and understood. From initial photoreception 3.75 billion years ago to early spatial recognition in the first cupped eyespot in Euglena to fully formed camera style eyes the size of beach balls in ichthyosaurs, animals have processed light to compete and survive in their respective niches. It is evolution's greatest gift and its greatest triumph. This is the story of the evolution of the eye.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Ivan+R+Schwab%22">Ivan R Schwab</searchLink>
– Name: TypePub
  Label: Resource Type
  Group: TypPub
  Data: eBook.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Anatomy%2C+Comparative%22">Anatomy, Comparative</searchLink><br /><searchLink fieldCode="DE" term="%22Adaptation+%28Biology%29%22">Adaptation (Biology)</searchLink><br /><searchLink fieldCode="DE" term="%22Eye--Evolution%22">Eye--Evolution</searchLink><br /><searchLink fieldCode="DE" term="%22Evolution+%28Biology%29%22">Evolution (Biology)</searchLink>
– Name: SubjectBISAC
  Label: Categories
  Group: Su
  Data: <searchLink fieldCode="ZK" term="%22MEDICAL+%2F+Ophthalmology%22">MEDICAL / Ophthalmology</searchLink><br /><searchLink fieldCode="ZK" term="%22SCIENCE+%2F+Life+Sciences+%2F+Evolution%22">SCIENCE / Life Sciences / Evolution</searchLink>
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=nlebk&AN=1632916
RecordInfo BibRecord:
  BibEntity:
    Classifications:
      – Code: 612.84
        Scheme: ddc
        Type: prePub
    Languages:
      – Code: eng
        Text: English
    Subjects:
      – SubjectFull: Anatomy, Comparative
        Type: general
      – SubjectFull: Adaptation (Biology)
        Type: general
      – SubjectFull: Eye--Evolution
        Type: general
      – SubjectFull: Evolution (Biology)
        Type: general
    Titles:
      – TitleFull: Evolution's Witness : How Eyes Evolved
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Ivan R Schwab
      – PersonEntity:
          Name:
            NameFull: Ivan R Schwab
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 01
              Type: published
              Y: 2012
            – D: 21
              M: 11
              Type: profile
              Y: 2017
          Identifiers:
            – Type: isbn-print
              Value: 9780195369748
            – Type: isbn-electronic
              Value: 9780199708727
            – Type: isbn-electronic
              Value: 9780199913336
          Titles:
            – TitleFull: Evolution's Witness : How Eyes Evolved
              Type: main
ResultId 1