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

(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)

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5/27/2021 | 2:00 PM - 3:30 PM | DEMOGRAPHIC RESPONSES OF A NATIVE MIGRATORY FISH FOLLOWING THE REMOVAL OF INVASIVE PREDATORS AND COMPETITORS FROM HAWAIIAN STREAMS | Virtual Platform

DEMOGRAPHIC RESPONSES OF A NATIVE MIGRATORY FISH FOLLOWING THE REMOVAL OF INVASIVE PREDATORS AND COMPETITORS FROM HAWAIIAN STREAMS

Understanding ecological outcomes of stream restoration can promote evidence-based decision-making. We assessed demographic responses of a native Hawaiian fish to aquatic invasive species (AIS) removal from treatment reaches in 12 watersheds on O‘ahu. Live-bearing fishes (Poeciliidae) and armored catfishes (Loricariidae) accounted for 66% of AIS removed. Population size, recruitment, growth rate, body condition, and in-stream movement of native fish were monitored in treatment and control reaches before and after removals. Population sizes did not change compared to pre-removal numbers. We observed no change in movement of individuals. The proportion of recruits increased significantly 3–6 months post-removals. Growth rates and body condition increased in the first 3 months following removal. The pulse in recruitment was short-lived; however elevated growth and body condition persisted for the duration of the study. Recruitment response magnitude correlated positively with effect size of poeciliid removals whereas growth and body condition response correlated positively with loricariid removals and negatively with stream discharge. AIS removal from Hawaiian streams can elicit demographic recovery of native fish. Populations should increase if elevated levels of recruitment and growth can be sustained long-term through more aggressive AIS removal or periodic control.

Management
Restoration
Stream restoration

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Presenters/Authors

James Hogan (), Texas A&M University – Corpus Christi, james.hogan@tamucc.edu;