Physiochemical properties influencing biomass abundance and primary production in Lake Hoare, Antarctica

Radu Herbei, W. Berry Lyons, Johanna Laybourn-Parry, Christopher Gardner, John C. Priscu and Diane M. McKnight

Ecological Modelling, 2010, vol. 221, issue 8, 1184-1193

Abstract: The perennially ice-covered, closed basin lakes in the McMurdo Dry Valleys respond rapidly to environmental changes, especially climate. For the past 15 years, the McMurdo Dry Valleys Long-Term Ecological Research (MCM-LTER) program has monitored the physical, chemical and biological properties of the lakes in Taylor Valley. In order to better assess the physiochemical controls on the biological process within one of these lakes (Lake Hoare), we have used vertical profile data to estimate depth-dependent correlations between various lake properties. Our analyses reveal the following results. Primary production rates (PPR) are strongly correlated to light (PAR) at 12–15m and to soluble reactive phosphorus (SRP) at 8–22m. Chlorophyll-a (CHL) is also positively correlated to PAR at 14m and greater depths, and SRP from 15m and greater. This preliminary statistical analysis supports previous observations that both PAR and SRP play significant roles in driving plant growth in Lake Hoare. The lack of a strong relationship between bacterial production (BP) and dissolved organic carbon (DOC) is an intriguing result of the analysis.

Keywords: Lake Hoare; MCM-LTER; Bayesian methods; Correlation analysis; Gaussian Markov random fields (search for similar items in EconPapers)
Date: 2010
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Persistent link: https://EconPapers.repec.org/RePEc:eee:ecomod:v:221:y:2010:i:8:p:1184-1193

DOI: 10.1016/j.ecolmodel.2009.12.015

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