| Evolution of complex life cycles in helminth parasites. | |
| | |
MedLine Citation:
|
PMID: 14523438 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The fundamental question of how complex life cycles--where there is typically more than one host-evolve in host--parasite systems remains largely unexplored. We suggest that complex cycles in helminths without penetrative infective stages evolve by two essentially different processes, depending on where in the cycle a new host is inserted. In 'upward incorporation', a new definitive host, typically higher up a food web and which preys on the original definitive host, is added. Advantages to the parasite are avoidance of mortality due to the predator, greater body size at maturity and higher fecundity. The original host typically becomes an intermediate host, in which reproduction is suppressed. In 'downward incorporation', a new intermediate host is added at a lower trophic level; this reduces mortality and facilitates transmission to the original definitive host. These two processes should also apply in helminths with penetrative infective stages, although the mathematical conditions differ. |
| | |
Authors:
|
Geoff A Parker; Jimmy C Chubb; Michael A Ball; Guy N Roberts |
Related Documents
:
|
7967658 - Ethnomycology, biochemistry, and cultivation of psilocybe samuiensis guzmán, bandala a... 15506108 - Microzooplankton grazing on phytoplankton in summer in the jiaozhou bay, china. 17950668 - Evolution of parasitic life in the ocean: paratenic hosts enhance lateral incorporation. 21295628 - Health discourse in swedish television food advertising during children's peak viewing ... 12392778 - Dietary enrichment counteracts age-associated cognitive dysfunction in canines. 19210238 - Composition, disintegrative properties, and labeling compliance of commercially availab... |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Nature Volume: 425 ISSN: 1476-4687 ISO Abbreviation: Nature Publication Date: 2003 Oct |
Date Detail:
|
Created Date: 2003-10-02 Completed Date: 2003-10-27 Revised Date: 2007-11-15 |
Medline Journal Info:
|
Nlm Unique ID: 0410462 Medline TA: Nature Country: England |
Other Details:
|
Languages: eng Pagination: 480-4 Citation Subset: IM |
Affiliation:
|
Population and Evolutionary Biology Research Group, School of Biological Sciences, University of Liverpool, Liverpool L69 7ZB, UK. gap@liverpool.ac.uk |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Body Constitution Helminths / growth & development, physiology* Host-Parasite Interactions Life Cycle Stages* Parasites / growth & development, physiology* Reproduction |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Binary switches and modification cassettes in histone biology and beyond.
Next Document: Programmable computing with a single magnetoresistive element.