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Determining carrying capacity from foraminiferal time-series

Brent Wilson and Benjamin P. Horton
Determining carrying capacity from foraminiferal time-series
Journal of Micropalaeontology (July 2012) 31 (2): 111-119

Abstract

The carrying capacity K is the equilibrium population density of a species that an area can support while adequately meeting the needs of every individual. Although widely used in ecology, it has yet to be applied rigorously to living foraminifera. K is readily determined from time-series of population densities. Given that N (sub t+1) =N (sub t) + RN (sub t) , in which N (sub t) is the population densities at time t, N (sub t+) is the density at a subsequent time t+1 and R is the per capita rate of change in population density, then linear regression gives R (sub t) = R (sub m) + sN (sub t) , in which R (sub t) is the per capita rate of increase at time t, the constant R (sub m) is the maximum possible individual rate of increase, and the negative slope s represents the strength of intraspecific interactions. Setting R (sub t) = 0, so that N (sub t) = K and R (sub m) + sK = 0, gives K = R (sub m) /s, which is applicable in aseasonal environments. There are two carrying capacities in seasonal environments, depending on whether the season is favourable (K (sub max) ) or unfavourable (K (sub min) ). Values of K (sub max) and K (sub min) are estimated for Nonion depressulus in the Exe estuary, UK (25 monthly samples), Quinqueloculina spp. in the Indian River Lagoon, USA (60 monthly samples) and Haynesina germanica in Cowpen Marsh, UK (25 fortnightly samples). The most precise estimate was for H. germanica, but it was unclear if this was due to the high rate of sampling or the large number of replicates used to erect this time-series.


ISSN: 0262-821X
EISSN: 2041-4978
Serial Title: Journal of Micropalaeontology
Serial Volume: 31
Serial Issue: 2
Title: Determining carrying capacity from foraminiferal time-series
Affiliation: University of the West Indies, Petroleum Geoscience Programme, Saint Augustine, Trinidad and Tobago
Pages: 111-119
Published: 201207
Text Language: English
Publisher: British Micropalaeontological Society, London, United Kingdom
References: 62
Accession Number: 2014-003409
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
N50°43'00" - N50°43'00", W03°31'60" - W03°31'60"
N54°37'00" - N54°37'00", W01°13'00" - W01°13'00"
Secondary Affiliation: University of Pennsylvania, USA, United States
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201404
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