Presentation Type

Poster

Keywords

behavioral ecology, invasive species, freshwater ecosystems, biodiversity, symbiosis, conservation

Department

Biology

Major

Biology

Abstract

Invasive crayfish, Procambarus clarkii, are known to negatively impact the biodiversity of Santa Monica Mountain streams. Small symbiotes, ostracods, live on Procambarus clarkii in some local streams. However, their effect on the behaviour of invasive crayfish is unknown. We used an aqueous chlorobutanol solution to remove ostracods from crayfish. We paired control crayfish with those that had ostracods removed and scored aggressive interactions. Crayfish without ostracods were found to be significantly more aggressive towards crayfish with ostracods. When we compared feeding behavior, we found that crayfish without ostracods consumed food more quickly than control crayfish. We again subjected crayfish to the ostracod removal process and confirmed that there were significantly fewer ostracods on the crayfish that had gone through the initial ostracod removal procedure. Given that the presence of ostracods seems to have moderated both aggressive and feeding behavior, we suggest that symbiote ostracods help reduce impacts of invasive crayfish on local streams.

Faculty Mentor

Dr. Lee Kats

Funding Source or Research Program

Summer Undergraduate Research Program

Start Date

23-4-2021 2:15 PM

End Date

23-4-2021 2:30 PM

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Apr 23rd, 2:15 PM Apr 23rd, 2:30 PM

The Effects of Symbiote Ostracods on Invasive Crayfish Behavior

Invasive crayfish, Procambarus clarkii, are known to negatively impact the biodiversity of Santa Monica Mountain streams. Small symbiotes, ostracods, live on Procambarus clarkii in some local streams. However, their effect on the behaviour of invasive crayfish is unknown. We used an aqueous chlorobutanol solution to remove ostracods from crayfish. We paired control crayfish with those that had ostracods removed and scored aggressive interactions. Crayfish without ostracods were found to be significantly more aggressive towards crayfish with ostracods. When we compared feeding behavior, we found that crayfish without ostracods consumed food more quickly than control crayfish. We again subjected crayfish to the ostracod removal process and confirmed that there were significantly fewer ostracods on the crayfish that had gone through the initial ostracod removal procedure. Given that the presence of ostracods seems to have moderated both aggressive and feeding behavior, we suggest that symbiote ostracods help reduce impacts of invasive crayfish on local streams.