EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

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5/21/2019  |   11:45 AM - 12:00 PM   |  UNRAVELING THE IMPACTS OF COMPETITION AND WARMING ON JUVELINE ATLANTIC SALMON (SALMO SALAR) PERFORMANCE IN MAINE STREAMS   |  250 CF

UNRAVELING THE IMPACTS OF COMPETITION AND WARMING ON JUVELINE ATLANTIC SALMON (SALMO SALAR) PERFORMANCE IN MAINE STREAMS

Understanding the temperature dependence of competition with warmwater species is a key aspect of managing salmonid fish populations as climate changes. By 2050, mean temperature in the state of Maine is expected to increase nearly 1oC, which could directly impact native coldwater salmonid performance and facilitate the spread of smallmouth bass and other non-native warmwater species. We conducted a microcosm experiment to examine the performance of juvenile Atlantic salmon (Salmo salar) at two temperatures (18oC and 21oC) in the presence and absence of non-native smallmouth bass (Micropterus dolomieu). Since bass are known to be aggressive competitors with higher thermal tolerance than salmon, we predicted salmon would exhibit lower feeding activity at higher temperatures compared to warm-adapted bass. By visually reviewing footage of fish competition in our tanks, we found salmon feeding activity was significantly reduced by bass presence and this effect was stronger at higher temperatures. These findings illustrate the potential for invasive warmwater species to outcompete native salmonids for resources, especially under warmer conditions. Therefore, salmonids may be vulnerable to impacts of invasive species and loss of coldwater as predicted in a changing climate.

  • Vertebrate
  • ClimateChange
  • Temperature

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Presenters/Authors

Nicole Ramberg-Pihl (), University of Maine, nicole.rambergpihl@maine.edu;


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Stephen Coghlan (), University of Maine, stephen.coghlan@maine.edu;


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Joseph Zydlewski (), USGS, University of Maine, josephz@maine.edu;


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Hamish Greig (), University of Maine, hamish.greig@maine.edu;


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