What Have We Lost? Modeling Dam Impacts on American Shad Populations Through Their Native Range
نویسندگان
چکیده
American shad ( Alosa sapidissima ) are native to the east coast of North America from St. Johns River, Florida, Lawrence River region in Canada. Since 1800s, dams have reduced access spawning habitat. To assess impact dams, we estimated historically accessed habitat coastal rivers (485,618 river segments with 21,113 current dams) based on (i) width, (ii) distance seawater, and (iii) slope (to exclude natural barriers migration) combined local knowledge. Estimated available prior dam construction (2,752 km 2 was 41% greater than fully accessible (1,639 ). River-specific population models were developed using estimates latitudinally appropriate life history parameters (e.g., size at age, maturity, iteroparity). coast-wide annual production potential 69.1 million spawners compared a dammed scenario (41.8 spawners). Even optimistic fish passage performance assumed for all (even if is completely absent), dam-imposed deficit alleviated by fewer 3 spawners. We estimate that modeled without 98,000 metric tons marine sourced biomass nutrients annually delivered, 60% which retained through carcasses, gametes metabolic waste. Damming this more one third. Based our results, represent significant acute constraint and, other human impacts, reduce fishery ecological services attributed species.
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ژورنال
عنوان ژورنال: Frontiers in Marine Science
سال: 2021
ISSN: ['2296-7745']
DOI: https://doi.org/10.3389/fmars.2021.734213