Date of this Version
Remote Sensing in Ecology and Conservation doi: 10.1002/rse2.147
Understanding insect and ﬁsh interactions from a spatial and temporal perspec-tive can have implications on large-scale phenology in freshwater systems, yet current information is limited. We employed a novel approach of combining information from acoustic telemetry for six freshwater ﬁsh species and weather radar to assess the phenology of mayﬂy emergence and foraging patterns of freshwater ﬁsh. We hypothesized that freshwater ﬁsh conduct synchronous movements with annual mayﬂy hatches as a pulse resource opportunity. Gener-alized additive models were developed to assess movement distance as a func-tion of species and time; before, during, and after annual mayﬂy hatch events. A cross-section abundance index was also employed to quantify dynamics of aerial mayﬂies. Hatch dynamics revealed nocturnal emergence behaviour with annual variations in intensity, spatial extent, and origin. We found that the hatch was likely a pulse resource feeding opportunity for channel catﬁsh, com-mon carp, freshwater drum, and walleye instead of a synchronized feeding event. Bigmouth buffalo and lake sturgeon utilized riverine habitat away from the hatch and did not likely forage on the emerging mayﬂies. Remote sensing of ﬁshes and emergent insects using our approach is the ﬁrst attempt at bridg-ing the capabilities of ﬁsheries ecology and aeroecology to advance movement ecology.