Abstract:
This is an Ecopath with Ecosim model of the West Florida Shelf. It is based on a model constructed by Mahmoudi (unpublished data) (see Okey et al. 2004 for an application) and later modified Gray et al. 2013 to incorporate additional exploited and non-exploited species and life stages known to be sensitive to harmful algal blooms (HABs). To incorporate HABs an additional (pseudo) fishing fleet is added into the model to provide a red tide mortality driver on adult fish and invertebrates. Biomass caught by this fleet is immediately cycled into the detritus pool, and thus nutrients from killed fish are made available to detritivores and the bacterial decomposition process. Included in the model are forcing functions to drive historical fishing and HABs from 1980 to 2009. NMFS (2013) was used to force fishing effort. J. Walter (unpublished data, SEFSC) provided a red tide composite series that is used as a driver of the red tide mortality (entered as an effort driver in Ecosim). The series also includes cell count information from FWRI. See Gray et al. 2013 for more information on model and time series development. This model was used in working papers for SEDAR 33 (Gray et al. 2013) and SEDAR 42 (Sagarese et al. 2014) benchmark assessments. Gray, A., Ainsworth, C., Chagaris, D. and Mahmoudi, B., 2013. Red tide mortality on gag grouper 1980-2009. Working paper. Southeast Data, Assessment, and Review (SEDAR) 33. National Marine Fisheries Service’s [NMFS] 2013. Vessel Operating Units Database. Accessed: 05/24/13. Okey, T.A., Vargo, G.A., Mackinson, S., Vasconcellos, M., Mahmoudi, B. and Meyer, C.A., 2004. Simulating community effects of sea floor shading by plankton blooms over the West Florida Shelf. Ecological Modelling, 172(2004): 339-359. Sagarese, S.R., Gray, A.M., Ainsworth, C.H., Chagaris, D.D., Mahmoudi, B., (2014). Red tide mortality on red grouper (Epinephelus morio) between 1980 and 2009 on the West Florida Shelf. SEDAR 42 Working Paper. SEDAR, North Charleston, SC. 11 pp.
Data Parameters and Units:
MODEL INPUT PARAMETERS: BASIC INPUT - Group name, Habitat area (fraction), Biomass in habitat area (t/km²), Total mortality (year), Production / biomass (/year), Consumption / biomass (/year), Ecotrophic Efficiency, Other mortality, Production / consumption, Unassim. consumption, Detritus import (t/km²/year); DETRITUS FATE - Source / fate, Dead carcasses, Sediment Detritus, Watercolumn Detritus, Drift Macrophytes, Export, Sum; DIET COMPOSITION - Prey \ predator, grid group name 1-84 by 1-73; OTHER PRODUCTION - Group name, Immigration (t/km²/year), Emigration (t/km²/year), Emigration rate (/year), Biom. accumul. (t/km²/year), Biom. acc. rate (/year); FISHERY INPUT: DEFINITION OF FLEETS - Fleet name, Fixed cost (%), Effort related cost (%), Sailing related cost (%), Profit (%), Total value (%); DISCARD FATE - Fleet name, Dead carcasses, Sediment Detritus, Watercolumn Detritus, Drift Macrophytes, Export, Sum; DISCARD MORTALITY RATE - Group name, Unknown, Trawl, Recreation, Headboats, Gill/trammel net, Spear/gig, Hook/line, Purse seine, Haul seine, Long line, Traps, Red Tide, Gag Fleet; DISCARDS - Group name, Unknown (t/km²), Trawl (t/km²), Recreation (t/km²), Headboats (t/km²), Gill/trammel net (t/km²), Spear/gig (t/km²), Hook/line (t/km²), Purse seine (t/km²), Haul seine (t/km²), Long line (t/km²), Traps (t/km²), Red Tide (t/km²), Gag Fleet (t/km²), Total; LANDINGS - Group name, Unknown (t/km²/year), Trawl (t/km²/year), Recreation (t/km²/year), Headboats (t/km²/year), Gill/trammel net (t/km²/year), Spear/gig (t/km²/year), Hook/line (t/km²/year), Purse seine (t/km²/year), Haul seine (t/km²/year), Long line (t/km²/year), Traps (t/km²/year), Red Tide (t/km²/year), Gag Fleet (t/km²/year), Total; NON-MARKET PRICE - Group name, Value (1/unit biomass); OFF-VESSEL PRICE - Group name, Unknown (1/unit biomass), Trawl (1/unit biomass), Recreation (1/unit biomass), Headboats (1/unit biomass), Gill/trammel net (1/unit biomass), Spear/gig (1/unit biomass), Hook/line (1/unit biomass), Purse seine (1/unit biomass), Haul seine (1/unit biomass), Long line (1/unit biomass), Traps (1/unit biomass), Red Tide (1/unit biomass), Gag Fleet (1/unit biomass); TOOL INPUT: GROWTH INPUT - Group name, a in LW, b in LW, L at infinity (cm), W at infinity (g), K in VBGF (/year), to in VBGF (year), Age first capture (year), Max. age (year); PEDIGREE - Group name, Biomass in habitat area, Production / biomass, Consumption / biomass, Diet, Catch; TRAITS - Species, Organism, Ecology, Occurrence status, Proportion of biomass, Proportion of catch, IUCN conservation status, Exploitation status, Vulnerability index [0, 100], Mean length (cm), Max length (cm), Mean weight (kg), Mean life span (year); MODEL OUTPUT PARAMETERS: BASIC ESTIMATES - Group name, Trophic level, Habitat area (fraction), Biomass in habitat area (t/km²), Biomass (t/km²), Total mortality (/year), Production / biomass (computed) (/year), Consumption / biomass (/year), Ecotrophic Efficiency, Production / consumption, Biom. accumul. (t/km²/year), Biom. acc. rate (/year); CONSUMPTION - Prey \ predator, grid group name 1-83 by 1-73; ELECTIVITY - Prey \ predator, grid group name 1-81 by 1-73; KEY INDICES - Group name, Net migration (t/km²/year), Flow to detr. (t/km²/year), Net efficiency, Omnivory index; SEARCH RATES - Prey \ predator, grid group name 1-81 by 1-73; FISHERY OUTPUT: QUANTITY - Group name, Unknown (t/km²/year), Trawl (t/km²/year), Recreation (t/km²/year), Headboats (t/km²/year), Gill/trammel net (t/km²/year), Spear/gig (t/km²/year), Hook/line (t/km²/year), Purse seine (t/km²/year), Haul seine (t/km²/year), Long line (t/km²/year), Traps (t/km²/year), Red Tide (t/km²/year), Gag Fleet (t/km²/year), Total catch (t/km²/year); VALUE - Group name, Unknown, Trawl, Recreation, Headboats, Gill/trammel net, Spear/gig, Hook/line, Purse seine, Haul seine, Long line, Traps, Red Tide, Gag Fleet, Catch value (1/year), Non-market value (1/year), Total value (1/year); MORTALITY RATE OUTPUT: FLEET FISHING MORTALITY RATES - Fleet\group, Unknown (/year),Trawl (/year), Recreation (/year), Headboats (/year), Gill/trammel net (/year), Spear/gig (/year), Hook/line (/year), Purse seine (/year), Haul seine (/year), Long line (/year), Traps (/year), Red Tide (/year), Gag Fleet (/year); MORTALITIES - Group name, Prod/biom or Z, equals Fishing mort. rate, + Predation mort. rate (/year), + Biomass accum. rate (/year), + Net migration rate (/year), + Other mort. rate (/year), Fishing mort. / total mort., Proportion natural mort.; PREDATION MORTALITY RATES - Prey \ predator, grid group name 1-77 by 1-73; NICHE OVERLAP OUTPUT: PREDITOR OVERLAP - Group name, grid group name 1-77 by 1-77; PREY OVERLAP - Group name, grid group name 1-77 by 1-77; RESPIRATION - Group name, Respiration (t/km²/year), Assimilation (t/km²/year), Respiration / assimilation,Production / respiration,Respiration / biomass (/year)
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