2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2018 | 2:45 PM - 3:00 PM | EVALUATING THE POTENTIAL FOR PRE-ZYGOTIC ISOLATION AND HYBRIDIZATION BETWEEN LANDLOCKED AND ANADROMOUS FISH POPULATIONS FOLLOWING SECONDARY CONTACT | 410 B
EVALUATING THE POTENTIAL FOR PRE-ZYGOTIC ISOLATION AND HYBRIDIZATION BETWEEN LANDLOCKED AND ANADROMOUS FISH POPULATIONS FOLLOWING SECONDARY CONTACT
Fish passage projects are altering habitat connectivity for many anadromous fish species, increasing the chance that previously isolated populations will come into contact. Many anadromous fish species have isolated and ecologically divergent freshwater resident populations. The outcome of secondary contact between divergent life histories may be complex and difficult to predict. To understand the complex ecological and evolutionary processes of secondary contact, we examined the potential for life history forms of several fish species to hybridize by synthesizing data on spawning time distributions. We use anadromous and landlocked alewife (Alosa pseudoharengus) as a case study, since they are currently undergoing secondary contact as a result of a fishway installation in Connecticut. We detected low levels (less than 15%) of overlap in spawning time between alewife life histories, with anadromous alewife spawning earlier and over a shorter duration than landlocked alewife. Overlap in spawning time was variable and driven by variation in the initiation of spawning by landlocked alewife. We discovered similar patterns in spawning behavior for other anadromous species. Hybridization between life histories after secondary contact may have significant and complex implications for the successful management of threatened fish populations.
- Dams
- Fish
- Restoration
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Presenters/Authors
Katherine Littrell
(), Yale University, katherine.littrell@yale.edu;
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Nonfinancial -