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Our new paper "Fishing, Environment, and the Erosion of a Population Portfolio" shows Haida Gwaii herring have declined in population growth and diversity, and points to potential benefits of fine-scale mgmt https://esajournals.onlinelibrary.wiley.com/doi/full/10.1002/ecs2.3283 @ConsLevin @jamealfsamhouri, Shelton & Feist
Herring sub populations have historically been very diverse, exhibiting unique dynamics in different sites
but more recently, many populations have declined in population growth (note log scale here where 1 = zero growth)
But sub-populations have grown increasingly similar through time. here's a moving window plot of average sub population similarity, showing sub-populations are increasingly synchronous throughout the archipelago
Our work complements recent work led by @DanielKOkamoto showing that finer scale management of metapopulations can have significant benefits https://esajournals.onlinelibrary.wiley.com/doi/10.1002/eap.2051 and similar evidence for changes in herring populations on the central coast
this work also complements very cool work by @margaretsiple and @tessafrancis showing herring population diversity in Puget Sound https://go.lnkam.com/link/r?u=https%3A%2F%2Flink.springer.com%2Farticle%2F10.1007%2Fs00442-015-3439-7&campaign_id=b7YMMAqMdAL7wyzNe5m3wz&source=4apvesisr53xcf
and was inspired by cool work by @fishteph showing how population diversity in salmon is a dynamic rather than static property. https://cdnsciencepub.com/doi/abs/10.1139/f2011-084?journalCode=cjfas
Our project benefitted immensely from really critical insight from a suite of Haida, DFO, and Parks Canada experts, that helped us make sure we understood the data we were working with and the context within which to interpret them and we are very grateful
