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Elevated Winter Pond Temperature and Biotic Resistance; Implications for Fish Invasion and Climate Change

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Elevated Winter Pond Temperature and Biotic Resistance; Implications for Fish Invasion and Climate Change Interaction between experimentally- elevated winter pond temperature and biotic resistance; implications for fish invasion and climate change Quenton M. Tuckett & Jeffrey E. Hill ICAIS-Fort Lauderdale Funding: Support: In Florida, temperature is an important habitat filter Affects distribution of non-native fish Many non-native propagules have tropical origin Photos: huffingtonpost.com, nytimes.com Biotic Filter: strongly-interacting native species in Florida 700 c 600 Green Swordtail 500 400 300 # stocked 200 Green swordtails (#) swordtails Green b 100 b a 0 High Medium Low Control Mesocosm experiment with/without eastern mosquitofish (Gambusia holbrooki) 1 60 0.9 0.8 50 0.7 40 0.6 0.5 30 0.4 20 0.3 Swordtail fry (count) Swordtail 0.2 10 Caudal damage (qualitative score) (qualitative Caudaldamage 0.1 0 0 Control Gambusia Control Gambusia Community assembly theory applied to invasion Species Pool • Begin with species pool • Habitat filter: is habitat suitable? Habitat Filter • Biotic filter: species interactions Biotic Filter • Arrive at species subset Species Subset • Neutral processes also important Need to consider potential for interactions Species Pool Habitat Filter Biotic Filter Species interactions Habitat alters alter habitat suitability species interactions Species Subset Two widely introduced poeciliids: Southern Platyfish (Xiphophorus maculatus) Guppy (Poecilia reticulata) Southern Platyfish (GBIF) Guppy (Deacon et al. 2011) • Southern Platyfish: Mexico to Belize • Guppy: Lesser Antilles, northern South America • May lack necessary cold tolerance to survive Florida “winter” Overall Goal: reveal how temperature interacts with biotic resistance to affect invasion success • Objective 1: determine chronic lethal minimum temperature for guppy and platy • Objective 2: examine response of native poeciliids to warming • Objective 3: examine interaction between warming and biotic resistance Chronic lethal minimum (CLmin) temperature trials Chronic lethal methodology (reduce temperature 1°C/day) How important is the habitat filter? Replicated pond study • Ponds with basal native community: eastern mosquitofish, least killifish, sailfin molly • Factorial design: covered ponds X presence of largemouth bass • 200 guppy & southern platyfish added • Eight week trial • Response: # native and non-native poeciliids Chronic Lethal Minimum Temperature Species CLmin (°C) Range TL (mm) Wt (g) Guppy 9.2 7.9-10.0 30.8 0.3 Southern Platyfish 7.3 6.0-9.1 34.4 0.6 Could be affected during cold periods, especially Guppy Winter temperature (December to March) in covered and uncovered ponds • Covered on December 8th • Covered ponds on average 4°C warmer • Temperature was sub-lethal Native fish response Note variable scale on vertical axis Guppy and southern platyfish response Number stocked in each pond Some potential for interactions Term p Bass < 0.001 Warming < 0.001 Species < 0.001 Bass*Warming 0.024 Warming*Species 0.193 Bass*Species 0.184 Bass*Warming*Species 0.083 How large are the effects? Addition of bass eliminates benefits of cover, increases eastern mosquitofish Largemouth Bass just one component of the fish community Multiple predator/competitor effects? Implications for invasion and climate change in Florida… uncertainty • Uncertain future climate: • Predictions include both warming and cooling • Incidence of extreme cold events – sweeping effect on tropical non-natives • Uncertain response of native fish: • Response of natives may be regional and taxon specific – biotic resistance may follow suit • Ultimately: • Freshwater fish fauna of Florida composed of many weedy species which are invasive elsewhere: largemouth bass, eastern mosquitofish, bluegill Uncertainty: range expansion/decline of established fish Acknowledgments • Ornamental aquaculture producers for fish donation • Florida Tropical Fish Farms Association (fish images) • Florida Department of Agriculture and Consumer Services • Mitchell Stanton, Kirsten Ressel, Larry Lawson, Shane Ramee, and Katelyn Lawson .
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