The University of Southampton
University of Southampton Institutional Repository

Threshold elemental ratios for carbon versus phosphorus limitation in Daphnia

Threshold elemental ratios for carbon versus phosphorus limitation in Daphnia
Threshold elemental ratios for carbon versus phosphorus limitation in Daphnia
1. The transition from carbon (C) to phosphorus (P) limited growth in Daphnia depends not only on the C : P ratio in seston, i.e. food quality, but also on food quantity. Carbon is commonly believed to be limiting at low food because of the energetic demands of basal metabolism. The critical C : P ratio in seston (otherwise known as the threshold elemental ratio, TER) above which P is limiting would then be high when food is scarce.
2. A new model that differentiates between the C : P requirements for growth and maintenance is presented that includes terms for both C and P in basal metabolism. At low food the calculated TERs for Daphnia of around 230 are only slightly higher than values of 200 or so at high intake. Seston C : P often exceeds 230, particularly in oligotrophic lakes where phytoplankton concentration is low and detritus dominates the diet, indicating the potential for limitation by P.
3. The analysis highlights the importance of P, as well as C, in maintenance metabolism and the overall metabolic budget, such that food quality is of importance even when intake is low. Further measurements of C and P metabolism at low food, in particular basal respiration and excretion rates, are needed in order to improve our understanding of the interacting roles of food quantity and quality in zooplankton nutrition.
0046-5070
2063-2075
Anderson, T.R.
dfed062f-e747-48d3-b59e-2f5e57a8571d
Hessen, D.O.
57c22fb0-cd1a-49bb-b998-5e653710d748
Anderson, T.R.
dfed062f-e747-48d3-b59e-2f5e57a8571d
Hessen, D.O.
57c22fb0-cd1a-49bb-b998-5e653710d748

Anderson, T.R. and Hessen, D.O. (2005) Threshold elemental ratios for carbon versus phosphorus limitation in Daphnia. Freshwater Biology, 50 (12), 2063-2075. (doi:10.1111/j.1365-2427.2005.01450.x).

Record type: Article

Abstract

1. The transition from carbon (C) to phosphorus (P) limited growth in Daphnia depends not only on the C : P ratio in seston, i.e. food quality, but also on food quantity. Carbon is commonly believed to be limiting at low food because of the energetic demands of basal metabolism. The critical C : P ratio in seston (otherwise known as the threshold elemental ratio, TER) above which P is limiting would then be high when food is scarce.
2. A new model that differentiates between the C : P requirements for growth and maintenance is presented that includes terms for both C and P in basal metabolism. At low food the calculated TERs for Daphnia of around 230 are only slightly higher than values of 200 or so at high intake. Seston C : P often exceeds 230, particularly in oligotrophic lakes where phytoplankton concentration is low and detritus dominates the diet, indicating the potential for limitation by P.
3. The analysis highlights the importance of P, as well as C, in maintenance metabolism and the overall metabolic budget, such that food quality is of importance even when intake is low. Further measurements of C and P metabolism at low food, in particular basal respiration and excretion rates, are needed in order to improve our understanding of the interacting roles of food quantity and quality in zooplankton nutrition.

Full text not available from this repository.

More information

Published date: 2005

Identifiers

Local EPrints ID: 19350
URI: http://eprints.soton.ac.uk/id/eprint/19350
ISSN: 0046-5070
PURE UUID: 444fd984-7d8f-405c-95b5-4bc51c429868

Catalogue record

Date deposited: 09 Feb 2006
Last modified: 15 Jul 2019 19:27

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×