Anemone bleaching spurs stronger home defense and more aggression among clownfish
Marine heat waves and anemone bleaching are altering clownfish behavior, making clownfish more defensive of their host and more aggressive toward one another, new research reveals.
Anemone bleaching and marine heat waves are causing clownfish to behave differently, according to new research published in the journal Royal Society Open Science. Led by Newcastle University, the study examined how clownfish responded to the 4th Global Bleaching Event. While the heat wave only had a minor effect on clownfish behavior, the loss of anemones' symbiotic algae due to bleaching led to more defensive actions and increased aggression among group members.
Researchers measured behavior changes from video recordings during a marine heat wave in Kimbe Bay, Papua New Guinea that lasted from March to July 2023. Clownfish displayed increased defense behaviors, such as aeration and cleaning of their host anemone, without altering their overall maintenance activities. However, aggression between the clownfish increased by 215%.
The study highlights the importance of mutualistic partnerships between anemonefish and anemones, as each partner depends on the other for defense and nutrients. While bleaching had more significant impacts on behavior than the elevated temperatures alone, heat stress itself did not affect clownfish activity levels. The research emphasizes the need to consider species interactions and mutualistic relationships when studying the effects of environmental changes.
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