Effects of stoichiometric dietary mixing on Daphnia growth and reproduction

Kumud Acharya, Marcia Kyle, James Elser

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Herbivores often encounter nutritional deficiencies in their diets because of low nutrient content of plant biomass. Consumption of various diet items with different nutrient contents can potentially alleviate these nutritional deficiencies. However, most laboratory studies and modeling of herbivorous animals have been done with diets in which all food has uniform nutrient content. It is not clear whether heterogeneous versus uniform food of equal overall nutrient content is of equivalent nutritional value. We tested the effects of dietary mixing on performance of a model organism, Daphnia. We fed two species of Daphnia (D. galeata, D. pulicaria) with diets of equivalent bulk stoichiometric food quality (C:P) and studied whether they would produce equivalent performance when C:P was uniform among cells or when the diet involved a mixture of high C:P and low C:P cells. Daphnia were fed saturating and limiting concentrations of a uniform food of moderate C:P (UNI) or mixtures (MIX) of high C:P (LOP) and low C:P (HIP) algae prepared to match C:P in UNI. Daphnia were also fed HIP and LOP algae separately. Juvenile growth rate and adult fecundity were measured. D. galeata performance in UNI and MIX treatments did not differ, indicating that partitioning of C and P among particles did not affect dietary quality. Similarly, D. pulicaria's performance was similar in the MIX and UNI treatments but only at low food abundance. In the high food treatment, both growth and reproduction were higher in the treatment, indicating some benefit of a more heterogeneous diet. The mechanisms for this improvement are unclear. Also, food quality affected growth and reproduction even at low food levels for both D. pulicaria and D. galeata. Our results indicate that some species of zooplankton can benefit from stoichiometric heterogeneity on diet.

Original languageEnglish (US)
Pages (from-to)333-340
Number of pages8
JournalOecologia
Volume138
Issue number3
DOIs
StatePublished - Feb 2004

Fingerprint

Daphnia
diet
Pulicaria
algae
food
nutrient content
Daphnia galeata
food quality
nutrient deficiencies
alga
nutritional adequacy
effect
fecundity
herbivore
zooplankton
herbivores
partitioning
nutritive value
cells
animal

Keywords

  • Bulk-seston
  • Carbon: phosphorus ratio
  • Mixed-uniform-diet
  • Nutrient
  • Zooplankton

ASJC Scopus subject areas

  • Ecology

Cite this

Effects of stoichiometric dietary mixing on Daphnia growth and reproduction. / Acharya, Kumud; Kyle, Marcia; Elser, James.

In: Oecologia, Vol. 138, No. 3, 02.2004, p. 333-340.

Research output: Contribution to journalArticle

Acharya, Kumud ; Kyle, Marcia ; Elser, James. / Effects of stoichiometric dietary mixing on Daphnia growth and reproduction. In: Oecologia. 2004 ; Vol. 138, No. 3. pp. 333-340.
@article{cdf0b336180742808ac5a921174265f5,
title = "Effects of stoichiometric dietary mixing on Daphnia growth and reproduction",
abstract = "Herbivores often encounter nutritional deficiencies in their diets because of low nutrient content of plant biomass. Consumption of various diet items with different nutrient contents can potentially alleviate these nutritional deficiencies. However, most laboratory studies and modeling of herbivorous animals have been done with diets in which all food has uniform nutrient content. It is not clear whether heterogeneous versus uniform food of equal overall nutrient content is of equivalent nutritional value. We tested the effects of dietary mixing on performance of a model organism, Daphnia. We fed two species of Daphnia (D. galeata, D. pulicaria) with diets of equivalent bulk stoichiometric food quality (C:P) and studied whether they would produce equivalent performance when C:P was uniform among cells or when the diet involved a mixture of high C:P and low C:P cells. Daphnia were fed saturating and limiting concentrations of a uniform food of moderate C:P (UNI) or mixtures (MIX) of high C:P (LOP) and low C:P (HIP) algae prepared to match C:P in UNI. Daphnia were also fed HIP and LOP algae separately. Juvenile growth rate and adult fecundity were measured. D. galeata performance in UNI and MIX treatments did not differ, indicating that partitioning of C and P among particles did not affect dietary quality. Similarly, D. pulicaria's performance was similar in the MIX and UNI treatments but only at low food abundance. In the high food treatment, both growth and reproduction were higher in the treatment, indicating some benefit of a more heterogeneous diet. The mechanisms for this improvement are unclear. Also, food quality affected growth and reproduction even at low food levels for both D. pulicaria and D. galeata. Our results indicate that some species of zooplankton can benefit from stoichiometric heterogeneity on diet.",
keywords = "Bulk-seston, Carbon: phosphorus ratio, Mixed-uniform-diet, Nutrient, Zooplankton",
author = "Kumud Acharya and Marcia Kyle and James Elser",
year = "2004",
month = "2",
doi = "10.1007/s00442-003-1444-8",
language = "English (US)",
volume = "138",
pages = "333--340",
journal = "Oecologia",
issn = "0029-8519",
publisher = "Springer Verlag",
number = "3",

}

TY - JOUR

T1 - Effects of stoichiometric dietary mixing on Daphnia growth and reproduction

AU - Acharya, Kumud

AU - Kyle, Marcia

AU - Elser, James

PY - 2004/2

Y1 - 2004/2

N2 - Herbivores often encounter nutritional deficiencies in their diets because of low nutrient content of plant biomass. Consumption of various diet items with different nutrient contents can potentially alleviate these nutritional deficiencies. However, most laboratory studies and modeling of herbivorous animals have been done with diets in which all food has uniform nutrient content. It is not clear whether heterogeneous versus uniform food of equal overall nutrient content is of equivalent nutritional value. We tested the effects of dietary mixing on performance of a model organism, Daphnia. We fed two species of Daphnia (D. galeata, D. pulicaria) with diets of equivalent bulk stoichiometric food quality (C:P) and studied whether they would produce equivalent performance when C:P was uniform among cells or when the diet involved a mixture of high C:P and low C:P cells. Daphnia were fed saturating and limiting concentrations of a uniform food of moderate C:P (UNI) or mixtures (MIX) of high C:P (LOP) and low C:P (HIP) algae prepared to match C:P in UNI. Daphnia were also fed HIP and LOP algae separately. Juvenile growth rate and adult fecundity were measured. D. galeata performance in UNI and MIX treatments did not differ, indicating that partitioning of C and P among particles did not affect dietary quality. Similarly, D. pulicaria's performance was similar in the MIX and UNI treatments but only at low food abundance. In the high food treatment, both growth and reproduction were higher in the treatment, indicating some benefit of a more heterogeneous diet. The mechanisms for this improvement are unclear. Also, food quality affected growth and reproduction even at low food levels for both D. pulicaria and D. galeata. Our results indicate that some species of zooplankton can benefit from stoichiometric heterogeneity on diet.

AB - Herbivores often encounter nutritional deficiencies in their diets because of low nutrient content of plant biomass. Consumption of various diet items with different nutrient contents can potentially alleviate these nutritional deficiencies. However, most laboratory studies and modeling of herbivorous animals have been done with diets in which all food has uniform nutrient content. It is not clear whether heterogeneous versus uniform food of equal overall nutrient content is of equivalent nutritional value. We tested the effects of dietary mixing on performance of a model organism, Daphnia. We fed two species of Daphnia (D. galeata, D. pulicaria) with diets of equivalent bulk stoichiometric food quality (C:P) and studied whether they would produce equivalent performance when C:P was uniform among cells or when the diet involved a mixture of high C:P and low C:P cells. Daphnia were fed saturating and limiting concentrations of a uniform food of moderate C:P (UNI) or mixtures (MIX) of high C:P (LOP) and low C:P (HIP) algae prepared to match C:P in UNI. Daphnia were also fed HIP and LOP algae separately. Juvenile growth rate and adult fecundity were measured. D. galeata performance in UNI and MIX treatments did not differ, indicating that partitioning of C and P among particles did not affect dietary quality. Similarly, D. pulicaria's performance was similar in the MIX and UNI treatments but only at low food abundance. In the high food treatment, both growth and reproduction were higher in the treatment, indicating some benefit of a more heterogeneous diet. The mechanisms for this improvement are unclear. Also, food quality affected growth and reproduction even at low food levels for both D. pulicaria and D. galeata. Our results indicate that some species of zooplankton can benefit from stoichiometric heterogeneity on diet.

KW - Bulk-seston

KW - Carbon: phosphorus ratio

KW - Mixed-uniform-diet

KW - Nutrient

KW - Zooplankton

UR - http://www.scopus.com/inward/record.url?scp=1342331062&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=1342331062&partnerID=8YFLogxK

U2 - 10.1007/s00442-003-1444-8

DO - 10.1007/s00442-003-1444-8

M3 - Article

C2 - 14716554

AN - SCOPUS:1342331062

VL - 138

SP - 333

EP - 340

JO - Oecologia

JF - Oecologia

SN - 0029-8519

IS - 3

ER -