Temporal variation in the importance of a dominant consumer to stream nutrient cycling
Abstract
Animal excretion can be a significant nutrient flux within ecosystems, where it supports primary production and facilitates microbial decomposition of organic matter. The effects of excretory products on nutrient cycling have been documented for various species and ecosystems, but temporal variation in these processes is poorly understood. We examined variation in excretion rates of a dominant grazing snail, Elimia clavaeformis, and its contribution to nutrient cycling, over the course of 14 months in a well-studied, low-nutrient stream (Walker Branch, east Tennessee, USA). Biomass-specific excretion rates of ammonium varied over twofold during the study, coinciding with seasonal changes in food availability (measured as gross primary production) and water temperature (multiple linear regression, R2 = 0.57, P = 0.053). The contribution of ammonium excretion to nutrient cycling varied with seasonal changes in both biological (that is, nutrient uptake rate) and physical (that is, stream flow) variables. On average, ammonium excretion accounted for 58% of stream water ammonium concentrations, 26% of whole-stream nitrogen demand, and 66% of autotrophic nitrogen uptake. Phosphorus excretion by Elimia was contrastingly low throughout the year, supplying only 1% of total dissolved phosphorus concentrations. The high average N:P ratio (89:1) of snail excretion likely exacerbated phosphorus limitation in Walkermore »
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge National Environmental Research Park
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1159990
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Ecosystems
- Additional Journal Information:
- Journal Volume: 17; Journal Issue: 7; Journal ID: ISSN 1432-9840
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Griffiths, Natalie A., and Hill, Walter. Temporal variation in the importance of a dominant consumer to stream nutrient cycling. United States: N. p., 2014.
Web. doi:10.1007/s10021-014-9785-1.
Griffiths, Natalie A., & Hill, Walter. Temporal variation in the importance of a dominant consumer to stream nutrient cycling. United States. https://doi.org/10.1007/s10021-014-9785-1
Griffiths, Natalie A., and Hill, Walter. Thu .
"Temporal variation in the importance of a dominant consumer to stream nutrient cycling". United States. https://doi.org/10.1007/s10021-014-9785-1. https://www.osti.gov/servlets/purl/1159990.
@article{osti_1159990,
title = {Temporal variation in the importance of a dominant consumer to stream nutrient cycling},
author = {Griffiths, Natalie A. and Hill, Walter},
abstractNote = {Animal excretion can be a significant nutrient flux within ecosystems, where it supports primary production and facilitates microbial decomposition of organic matter. The effects of excretory products on nutrient cycling have been documented for various species and ecosystems, but temporal variation in these processes is poorly understood. We examined variation in excretion rates of a dominant grazing snail, Elimia clavaeformis, and its contribution to nutrient cycling, over the course of 14 months in a well-studied, low-nutrient stream (Walker Branch, east Tennessee, USA). Biomass-specific excretion rates of ammonium varied over twofold during the study, coinciding with seasonal changes in food availability (measured as gross primary production) and water temperature (multiple linear regression, R2 = 0.57, P = 0.053). The contribution of ammonium excretion to nutrient cycling varied with seasonal changes in both biological (that is, nutrient uptake rate) and physical (that is, stream flow) variables. On average, ammonium excretion accounted for 58% of stream water ammonium concentrations, 26% of whole-stream nitrogen demand, and 66% of autotrophic nitrogen uptake. Phosphorus excretion by Elimia was contrastingly low throughout the year, supplying only 1% of total dissolved phosphorus concentrations. The high average N:P ratio (89:1) of snail excretion likely exacerbated phosphorus limitation in Walker Branch. To fully characterize animal excretion rates and effects on ecosystem processes, multiple measurements through time are necessary, especially in ecosystems that experience strong seasonality.},
doi = {10.1007/s10021-014-9785-1},
journal = {Ecosystems},
number = 7,
volume = 17,
place = {United States},
year = {Thu Jun 19 00:00:00 EDT 2014},
month = {Thu Jun 19 00:00:00 EDT 2014}
}
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