Evaluation of and insights from ALFISH: A spatially explicit, landscape-level simulation of fish populations in the Everglades

Holly Gaff, John Chick, Joel Trexler, Donald DeAngelis, Louis Gross, René Saunas

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We present an evaluation of a spatially explicit, age-structured model created to assess fish density dynamics in the Florida Everglades area. This model, ALFISH, has been used to compare alternative management scenarios for the Florida Everglades region. This area is characterized by periodic dry downs and refloodings. ALFISH uses spatially explicit water depth data to predict patterns of fish density. Here we present a method for calibration of ALFISH, based on information concerning fish movement, pond locations and other field data. With the current information, the greatest coefficient of determination achieved from regressions of ALFISH output to field data is 0.35 for fish density and 0.88 for water depth. The poor predictability of fish density mirrors the empirical findings that hydrology, which is the main driver of the model, only accounts for 20-40% of the variance of fish densities across the Everglades landscape. Sensitivity analyses indicate that fish in this system are very sensitive to frequency, size and location of permanent ponds as well as availability of prey.

Original languageEnglish
Pages (from-to)73-87
Number of pages15
JournalHydrobiologia
Volume520
Issue number1-3
DOIs
StatePublished - Jun 1 2004

Fingerprint

Fish
fish
simulation
Ponds
water depth
pond
Hydrology
evaluation
hydrology
Water
calibration
water
Availability
Calibration

Keywords

  • Everglades
  • Fish
  • Freshwater marshes
  • Model evaluation
  • Model validation
  • Spatially explicit model

ASJC Scopus subject areas

  • Aquatic Science
  • Oceanography
  • Environmental Science(all)
  • Pollution
  • Water Science and Technology

Cite this

Evaluation of and insights from ALFISH : A spatially explicit, landscape-level simulation of fish populations in the Everglades. / Gaff, Holly; Chick, John; Trexler, Joel; DeAngelis, Donald; Gross, Louis; Saunas, René.

In: Hydrobiologia, Vol. 520, No. 1-3, 01.06.2004, p. 73-87.

Research output: Contribution to journalArticle

Gaff, Holly ; Chick, John ; Trexler, Joel ; DeAngelis, Donald ; Gross, Louis ; Saunas, René. / Evaluation of and insights from ALFISH : A spatially explicit, landscape-level simulation of fish populations in the Everglades. In: Hydrobiologia. 2004 ; Vol. 520, No. 1-3. pp. 73-87.
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