EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/23/2019 | 2:15 PM - 2:30 PM | AQUIFER STONEFLIES (PLECOPTERA) ARE TOLERANT OF ANOXIA AND HYPOXIA COMPARED TO BENTHIC SPECIES | 250 AB
AQUIFER STONEFLIES (PLECOPTERA) ARE TOLERANT OF ANOXIA AND HYPOXIA COMPARED TO BENTHIC SPECIES
At least 7 stonefly species are widespread amphibionts in alluvial aquifers which contain highly heterogeneous habitats, including zones with low concentrations of dissolved oxygen. We conducted 92-hr oxygen tolerance experiments (anoxic and hypoxic conditions) on 2400 individual stonefly larvae obtained from aquifer and benthic sites in the Flathead River, Montana. We reduced oxygen concentrations to anoxia (0.0 mg/L) or hypoxia (0.5 mg/L), documented locomotor activity during and after oxygen drawdown, and measured survival rates over the course of the experiments. Aquifer species were active 31x longer in anoxia and 3x longer in hypoxia than benthic species. Notably Paraperla frontalis and Isocapnia spp – aquifer species - were ambulatory for up to 4 and 48 hours (respectively) of exposure to anoxia. Early-instar larvae were more tolerant than late-instars. Multinomial logistic regression analysis showed that aquifer species had significantly (P<0.001) higher probabilities of surviving than benthic species in anoxia and hypoxia. Tolerance to low oxygen and the ability to remain ambulatory in anoxia helps explain why amphibiotic stonefly species are notably abundant in alluvial aquifers where food webs are subsidized by methanotrophic resources produced in anoxic zones.
- Invertebrate
- Oxygen
- Functional Ecology
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Presenters/Authors
Rachel Malison
(), Flathead Lake Biological Station, The University of Montana, rachel.malison@umontana.edu;
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Hailey Jacobson
(), Flathead Lake Biological Station, The University of Montana, haileyjacobson4@gmail.com;
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Brian Hand
(), Flathead Lake Biological Station, The University of Montana, brian.hand@umontana.edu;
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Gordon Luikart
(), Flathead Lake Biological Station, The University of Montana, gordon.luikart@umontana.edu;
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Jack Stanford
(), Flathead Lake Biological Station-University of Montana, jack.stanford@umontana.edu;
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