• English
    • français
    • Deutsch
    • español
    • português (Brasil)
    • Bahasa Indonesia
    • русский
    • العربية
  • العربية 
    • English
    • français
    • Deutsch
    • español
    • português (Brasil)
    • Bahasa Indonesia
    • русский
    • العربية
  • دخول
عرض المادة 
  •   الرئيسية
  • OAI Data Pool
  • OAI Harvested Content
  • عرض المادة
  •   الرئيسية
  • OAI Data Pool
  • OAI Harvested Content
  • عرض المادة
JavaScript is disabled for your browser. Some features of this site may not work without it.

استعرض

جميع محتويات المستودعالمجتمعات & الحاوياتحسب تاريخ النشرالعناوينهذه الحاويةحسب تاريخ النشرالعناوينProfilesView

حسابي

دخول تسجيل

The Library

AboutNew SubmissionSubmission GuideSearch GuideRepository PolicyContact

Morphospaces and Databases: Diatom Diversification through Time

  • CSV
  • RefMan
  • EndNote
  • BibTex
  • RefWorks
Author(s)
Kotrc, Benjamin
Knoll, Andrew Herbert
Keywords
Morphospaces, diatoms
Diversification
Taxonomic diversity
Evolution
Biodiversity, phylogeny, fossil record

واصفات البيانات
عرض سجل المادة الكامل
URI
http://hdl.handle.net/20.500.12424/1032164
Online Access
http://nrs.harvard.edu/urn-3:HUL.InstRepos:30403696
Abstract
The diversity of diatom form inspired Art Nouveau designers, an interest renewed by recent advances in biomimetic design. The fossil record provides two windows on the diversification history of diatoms: taxonomic diversity and morphological disparity. Marine planktonic diatom diversity is conventionally interpreted to describe a steep, almost monotonic rise through Cenozoic time. Subsampling methods used to address the associated rise in sampling reveal a more stationary pattern, with peak diversity in the mid-Cenozoic, whether by established methods or a new method (shareholder quorum subsampling, SQS). However, these methods may underestimate diversification if evenness decreases. In order to measure morphological disparity, we constructed an empirical morphospace based on discrete characters. Mean pairwise distance, a disparity metric describing the density of taxa in morphospace, shows little secular change , while convex hull volume, a measure of the extent of occupied morphospace, increases through time. Since we populated the morphospace with occurrence-based data, we can apply subsampling algorithms to these disparity metrics. Mean pairwise distance is largely unaffected, while the increase in occupied volume largely disappears under subsampling. Depending on the metric used, characterizing diatom diversification thus depends upon whether a literal reading of the fossil record or the use of subsampling algorithms is preferred. While this may prompt a reexamination of evolutionary narratives prominently featuring diatom diversification, changes in abundance and silicification may also affect the diatom’s biogeochemical importance. For biologically inspired design, an early exploration of diatom morphospace suggests that fossil forms should be considered alongside extant diatoms.
Organismic and Evolutionary Biology
Date
2017-02-21
Type
Monograph or Book
Identifier
oai:dash.harvard.edu:1/30403696
Kotrc, Benjamin, and Andrew H. Knoll. 2015. “Morphospaces and Databases: Diatom Diversification through Time.” In Evolution of Lightweight Structures, ed. Christian Hamm: 17–37. doi:10.1007/978-94-017-9398-8_2.
978-94-017-9397-1
2211-0593
http://nrs.harvard.edu/urn-3:HUL.InstRepos:30403696
Copyright/License
open
حاويات
OAI Harvested Content

entitlement

 
DSpace software (copyright © 2002 - 2019)  DuraSpace
Quick Guide | اتصل بنا
Open Repository is a service operated by 
Atmire NV
 

Export search results

The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.