| Autor: |
Kahn, Jason E., Hager, Christian H., Breault, D. Kyle, Watterson, J. Carter |
| Předmět: |
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| Zdroj: |
Fishery Bulletin; 2023, Vol. 121 Issue 4, p161-171, 11p |
| Abstrakt: |
The Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus) has been listed under the Endangered Species Act since 2012, with the Chesapeake Bay distinct population segment listed as endangered. We tracked the timing of occupancy and movement in Chesapeake Bay of adult Atlantic sturgeon from the York River to best identify when Atlantic sturgeon are likely to interact with anthropogenic threats. We monitored 84 adult (40 male and 44 female) Atlantic sturgeon from August 2013 through January 2020 by using acoustic telemetry. Both spawning and non-spawning fish regularly utilized Chesapeake Bay, with females and males arriving as early as 27 February (when the mean water temperature was 7.7°C) and 4 March (6.5°C) and departing as late as 24 January (6.3°C) and 27 January (6.5°C), respectively. Peak occupation of the bay by Atlantic sturgeon occurred from 1 April to 31 August and again from 15 October to 1 December. Females of above average size (>1880 mm in fork length) spent significantly longer in the bay (>113 d) than smaller females and all males before spawning; therefore, the females capable of producing the most eggs were disproportionately exposed to anthropogenic threats. Although changes in arrival and departure dates are not statistically significant, during the 7 years of this study, both males and females generally arrived earlier and departed later each year than the previous year, increasing residency in Chesapeake Bay by a month in that time. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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