Comparisons between Consumption Estimates from Bioenergetics Simulations and Field Measurements for Walleyes from Oneida Lake, New York
Authored by Lars G Rudstam, Brian F Lantry, John L Forney, Anthony J VanDeValk, Edward L Mills, Donald J Stewart, Jean V Adams
Date Published: 2008
DOI: 10.1577/t07-051.1
Sponsors:
Electric Power Research Institute (EPRI)
Platforms:
Statistical Analysis Software (SAS)
Model Documentation:
Other Narrative
Mathematical description
Model Code URLs:
Model code not found
Abstract
Daily consumption was estimated from the stomach contents of walleyes
Sander vitreus collected weekly from Oneida Lake, New York, during
June-October 1975, 1992, 1993, and 1994 for one to four age-groups per
year. Field rations were highly variable between weeks, and trends in
ration size varied both seasonally and annually. The coefficient of
variation for weekly field rations within years and ages ranged from
45\% to 97\%. Field estimates were compared with simulated consumption
from a bioenergetics model. The simulation averages of daily ration
deviated from those of the field estimates by -20.1\% to +70.3\%, with a
mean across all simulations of +14.3\%. The deviations for each time
step were much greater than those for the simulation averages, ranging
from -92.8\% to +363.6\%. A systematic trend in the deviations was
observed, the model producing overpredictions at rations less than 3.7\%
of body weight. Analysis of variance indicated that the deviations were
affected by sample year and week but not age. Multiple linear regression
using backwards selection procedures and Akaike's information criterion
indicated that walleye weight, walleye growth, lake temperature, prey
energy density, and the proportion of gizzard shad Dorosoma cepedianum
in the diet significantly affected the deviations between simulated and
field rations and explained 32\% of the variance.
Tags
Individual-based
model
Stizostedion-vitreum-vitreum
Yellow perch
Food-consumption
Dreissena-polymorpha
Perch perca-fluviatilis
The-year walleye
Laboratory
evaluation
Systematic-error
Micropterus-salmoides