EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/24/2018 | 10:00 AM - 10:15 AM | LONG-TERM RESPONSES OF NATIVE BIVALVES (UNIONIDAE AND SPHAERIIDAE) TO THE DREISSENID INVASION OF THE FRESHWATER TIDAL HUDSON RIVER | 410 A
LONG-TERM RESPONSES OF NATIVE BIVALVES (UNIONIDAE AND SPHAERIIDAE) TO THE DREISSENID INVASION OF THE FRESHWATER TIDAL HUDSON RIVER
A 28-year study documented complicated responses of native bivalves to the dreissenid invasion of the Hudson River. Early in the invasion (1993-2000), populations of native species declined steeply, reaching 0-35% of pre-invasion densities by the year 2000. These declines in population density were accompanied by large declines in body mass, body condition, and recruitment. Since the year 2000, sphaeriid populations have recovered to pre-invasion densities, and body condition, recruitment, and juvenile growth of unionids have recovered substantially, even though the number of dreissenids in the river has not declined. However, unionid populations did not recover, and 2 of 3 formerly common unionid species have not been collected in several years. The 3rd species appears about to disappear. Statistical and demographic models suggest that the dynamics of native populations were more likely driven by exploitative competition than by fouling. They also suggest that changes in dreissenid body size may have modulated the strength of this exploitative competition over the course of the invasion. The lack of recovery of unionid populations appears to be a result of failure of juveniles to reach adulthood, probably because of high mortality from predators.
- Mussel
- Population
- Conservation
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Presenters/Authors
David Strayer
(), Cary Institute of Ecosystem Studies, strayerd@caryinstitute.org;
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Heather Malcom
(), Cary Institute of Ecosystem Studies, malcomh@caryinstitute.org;
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