| Responses of alkaline phosphatase activity to phosphorus stress in Daphnia magna. | |
| | |
MedLine Citation:
|
PMID: 20038659 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
We examined how alkaline phosphatase (AP) activity within the bodies and in the materials released by the crustacean Daphnia magna responds to variable algal food phosphorus (P)-content. We found that Daphnia eating P-poor food (C:P approximately 700) had significantly higher AP activity in their bodies on a mass-specific basis compared with individuals eating P-rich food (C:P approximately 100). This dietary P effect on AP activity was not altered by Daphnia starvation but was partially related to differences in the P concentration of animal body homogenates. By contrast, poor P-nutrition of Daphnia lowered AP activity in released materials compared with that measured from their P-sufficient conspecifics. Moreover, AP activity in Daphnia release was lowest in animals consuming P-poor food for longer time periods. Our results support the hypothesis that AP activity increases inside P-limited Daphnia as a mechanism to increase P-acquisition and retention from ingested algae in these nutritionally stressed animals. The lower level of AP activity present in the water of P-deprived animals could reflect a change from largely free to membrane-bound AP isotypes in the digestive tracts of P-starved animals or a decrease in the shedding of membrane-anchored AP from their intestinal lining. These results supplement accumulating evidence that P-poor algal food reduces the dietary mineral P available to Daphnia. In addition, animal body AP activity measurements, with some refinement, may prove useful as an in situ indicator of P-stress in aquatic consumers. |
| | |
Authors:
|
S D S McCarthy; S P Rafferty; P C Frost |
Related Documents
:
|
19094259 - The principles, practices and some future applications of near infrared spectroscopy fo... 8457919 - Heritability and diagnosis of congenital abnormalities in food animals. 17715819 - Application of campylobacter molecular classification and typing techniques in veterina... 12052189 - Pf1022a and related cyclodepsipeptides - a novel class of anthelmintics. 7349769 - Harmful effects of carrageenan fed to animals. 3559859 - The role of intraluminal tension and ph in the development of necrotizing enterocolitis... 22874429 - Assessment of the daily intake of 62 polychlorinated biphenyls from dietary exposure in... 18178249 - High dose cart peptide induces abnormal eeg activity and behavioral seizures. 16376969 - Estimation of 1999-2004 dietary daily intake of pcdds, pcdfs and dioxin-like pcbs by a ... |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: The Journal of experimental biology Volume: 213 ISSN: 1477-9145 ISO Abbreviation: J. Exp. Biol. Publication Date: 2010 Jan |
Date Detail:
|
Created Date: 2009-12-29 Completed Date: 2010-03-23 Revised Date: 2010-05-19 |
Medline Journal Info:
|
Nlm Unique ID: 0243705 Medline TA: J Exp Biol Country: England |
Other Details:
|
Languages: eng Pagination: 256-61 Citation Subset: IM |
Affiliation:
|
Department of Biology, Trent University, Peterborough, ON, Canada K9J 7B8. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Alkaline Phosphatase
/
metabolism* Animal Feed Animals Daphnia / drug effects*, enzymology* Energy Metabolism Phosphorus, Dietary / pharmacology* |
| Chemical | |
Reg. No./Substance:
|
0/Phosphorus, Dietary; EC 3.1.3.1/Alkaline Phosphatase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Spatial vision in the purple sea urchin Strongylocentrotus purpuratus (Echinoidea).
Next Document: The moment before touchdown: landing manoeuvres of the honeybee Apis mellifera.