The ecological niche of Daphnia magna characterized using population growth rate

Helen L. Hooper, Richard E Connon, Amanda Callaghan, Geoffrey Fryer, Sarah Yarwood-Buchanan, Jeremy Biggs, Steve J. Maund, Thomas H. Hutchinson, Richard M. Sibly

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

The concept of an organism's niche is central to ecological theory, but an operational definition is needed that allows both its experimental delineation and interpretation of field distributions of the species. Here we use population growth rate (hereafter, pgr) to define the niche as the set of points in niche space where pgr > 0. If there are just two axes to the niche space, their relationship to pgr can be pictured as a contour map in which pgr varies along the axes in the same way that the height of land above sea level varies with latitude and longitude. In laboratory experiments we measured the pgr of Daphnia magna over a grid of values of pH and Ca2+, and so defined its "laboratory niche" in pH-Ca2+ space. The position of the laboratory niche boundary suggests that population persistence is only possible above 0.5 mg Ca2+/L and between pH 5.75 and pH 9, though more Ca 2+ is needed at lower pH values. To see how well the measured niche predicts the field distribution of D. magna, we examined relevant field data from 422 sites in England and Wales. Of the 58 colonized water bodies, 56 lay within the laboratory niche. Very few of the sites near the niche boundary were colonized, probably because pgr there is so low that populations are vulnerable to extinction by other factors. Our study shows how the niche can be quantified and used to predict field distributions successfully.

Original languageEnglish (US)
Pages (from-to)1015-1022
Number of pages8
JournalEcology
Volume89
Issue number4
DOIs
StatePublished - Apr 2008
Externally publishedYes

Fingerprint

Daphnia magna
niche
population growth
niches
calcium
ecological niche
ecological theory
contour map
longitude
Wales
sea level
body water
England
extinction
persistence
biogeography

Keywords

  • Calcium
  • Daphnia magna
  • Ecological niche
  • Fundamental niche
  • pH
  • Population growth rate

ASJC Scopus subject areas

  • Ecology

Cite this

Hooper, H. L., Connon, R. E., Callaghan, A., Fryer, G., Yarwood-Buchanan, S., Biggs, J., ... Sibly, R. M. (2008). The ecological niche of Daphnia magna characterized using population growth rate. Ecology, 89(4), 1015-1022. https://doi.org/10.1890/07-0559.1

The ecological niche of Daphnia magna characterized using population growth rate. / Hooper, Helen L.; Connon, Richard E; Callaghan, Amanda; Fryer, Geoffrey; Yarwood-Buchanan, Sarah; Biggs, Jeremy; Maund, Steve J.; Hutchinson, Thomas H.; Sibly, Richard M.

In: Ecology, Vol. 89, No. 4, 04.2008, p. 1015-1022.

Research output: Contribution to journalArticle

Hooper, HL, Connon, RE, Callaghan, A, Fryer, G, Yarwood-Buchanan, S, Biggs, J, Maund, SJ, Hutchinson, TH & Sibly, RM 2008, 'The ecological niche of Daphnia magna characterized using population growth rate', Ecology, vol. 89, no. 4, pp. 1015-1022. https://doi.org/10.1890/07-0559.1
Hooper HL, Connon RE, Callaghan A, Fryer G, Yarwood-Buchanan S, Biggs J et al. The ecological niche of Daphnia magna characterized using population growth rate. Ecology. 2008 Apr;89(4):1015-1022. https://doi.org/10.1890/07-0559.1
Hooper, Helen L. ; Connon, Richard E ; Callaghan, Amanda ; Fryer, Geoffrey ; Yarwood-Buchanan, Sarah ; Biggs, Jeremy ; Maund, Steve J. ; Hutchinson, Thomas H. ; Sibly, Richard M. / The ecological niche of Daphnia magna characterized using population growth rate. In: Ecology. 2008 ; Vol. 89, No. 4. pp. 1015-1022.
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