American Eel (Anguilla rostrata) freshwater population trajectory in Canada
Why is this work in the frame?
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
No Canadian affiliation. An affiliation-only frame — the usual design — would never have seen this work. It is one of the works that make the case for inverting the frame.
The three-model screen
all 1,000 screened works →All three models called this out of scope.
Fisheries science estimating American Eel abundance trends across Canada.
This analyzes Canadian American eel population trends rather than the Canadian research system.
Ecology/conservation trend analysis of American eel abundance, not research practice.
Abstract
Describing trends in American Eel (Anguilla rostrata) abundances has been tackled regularly at various locations across its range; however, describing a common trajectory for the whole panmictic population has been a challenge. As a step toward this broader challenge, 12 fishery-independent datasets from freshwater across the Canadian range were used to estimate a Canada-wide trajectory of American Eel relative abundance. These datasets averaged 29 years per time series (range: 14-65) over the 1952-2018 time period. Time series mostly tracked yellow eel (n = 10), with some elver (n = 1) and silver eel (n = 1). Each dataset was standardized to control for potentially confounding factors, and the standardized statistical models were used to generate a standardized time series of relative abundance. These standardized relative abundances were transformed to a common scale, and a Canada-wide trend was fit. Generally, datasets with more historical data had more negative year trends. The Canada-wide trend produced mean rates of decline of -0.021 to -0.046 per year since 1980. The model indicated a 100% likelihood that the Canadian freshwater population has declined since 1980 and a 69.2-100% likelihood that the decline was greater than 50%. Limiting data to the 2000-2018 years produced less negative trends that generally did not differ from zero. Results were robust to the data standardizations, inclusion or exclusion of individual datasets, and adjustments for the spatial distribution of data. Overall, this analysis shows that while American Eel freshwater abundance in Canada has been stable over the last two decades, significant declines preceded this time period and were not limited to the St. Lawrence basin.
Stored with the screening record, where it is evidence for the labels above.
The record
- Venue
- Federal Open Science Repository of Canada / Le Dépôt fédéral de science ouverte du Canada
- Topic
- Field
- Canadian institutions
- —
- Funders
- —
- Keywords
- PopulationPanmixiaRange (aeronautics)Abundance (ecology)Series (stratigraphy)Time seriesLimiting
- Has abstract in OpenAlex
- yes