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• W2020647533 abstract "Understanding historical roles of species in ecosystems can be crucial for assessing long term human impacts on environments, providing context for management or restoration objectives, and making conservation evaluations of species status. In most cases limited historical abundance data impedes quantitative investigations, but harvested species may have long-term data accessible from hunting records. Here we make use of annual hunting records for Caspian seals (Pusa caspica) dating back to the mid-19(th) century, and current census data from aerial surveys, to reconstruct historical abundance using a hind-casting model. We estimate the minimum numbers of seals in 1867 to have been 1-1.6 million, but the population declined by at least 90% to around 100,000 individuals by 2005, primarily due to unsustainable hunting throughout the 20(th) century. This collapse is part of a broader picture of catastrophic ecological change in the Caspian over the 20(th) Century. Our results combined with fisheries data show that the current biomass of top predators in the Caspian is much reduced compared to historical conditions. The potential for the Caspian and other similar perturbed ecosystems to sustain natural resources of much greater biological and economic value than at present depends on the extent to which a number of anthropogenic impacts can be harnessed." @default.
• W2020647533 created "2016-06-24" @default.
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• W2020647533 date "2012-09-19" @default.
• W2020647533 modified "2023-10-17" @default.
• W2020647533 title "Collapse of a Marine Mammal Species Driven by Human Impacts" @default.
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• W2020647533 doi "https://doi.org/10.1371/journal.pone.0043130" @default.
• W2020647533 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3446954" @default.
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