Elucidating the distribution of potential spawning habitat and determinants of productivity for anadromous salmonids

概要

Freshwater ecosystems have suffered from habitat fragmentation caused by dams (Strayer
and Dudgeon 2010, Wu et al. 2019, Reid et al. 2019). The consequences of habitat
fragmentation are numerous and include impeding the migration of organisms
(Puijenbroek et al. 2019), restricting their distribution (Fukushima et al. 2007), and
undermining biodiversity (Liermann et al. 2012, Liu et al. 2019). Dams have been
constructed worldwide (Grill et al. 2019, Belletti et al. 2020), and 48% of the world's
rivers have been affected by fragmentation, flow regulation, or both (Grill et al. 2015).
Furthermore, since innumerable dams and hydropower plants are under construction or
are planned for construction (Zarfl et al. 2015, Winemiller et al. 2016, Couto and Olden
2018), the negative effects of fragmentation on freshwater ecosystems are likely to
intensify in the future.
Habitat restoration, such as the installation of fishways and partial and complete
removal of dams, has been conducted to mitigate the adverse effects of fragmentation on
freshwater ecosystems (Garcia de Leaniz 2008, Kiffney et al. 2009, Nakamura and
Komiyama 2010, Fjeldstad et al. 2012, Birnie-Gauvin et al. 2018). However, due to
numerous barriers, resources and time for restoration are scarce. Thus, restoration efforts
should be prioritized based on some criteria to maximize benefits. Given that many stream
fishes migrate through rivers to spawn (Fredrich et al. 2003, Kume et al. 2005, Jackson
and Moser 2012, Quinn 2018, Kazyak et al. ...

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