Multidecadal, centennial, and millennial variability in sardine and anchovy abundances in the western North Pacific and climate–fish linkages during the late Holocene

Review of population dynamics and management of small pelagic fishes around the Japanese Archipelago

“…In the same study, spectral analysis of the SDR indicated that sardine and anchovy both tended to vary over a period of approximately 60 years, and anchovy also fluctuated at a period of approximately 100 years. Kuwae et al (2017) also reported that since the late 15th century, the SDR variability nearly coincided with good/poor cycles in Japanese archives of catch records obtained from the Kanto area of Honshu Island to the northeast of Kyushu Island. Kuwae et al (2017) detected a multicentennial coherency in the variability of sardine abundance with variability in the abnormal snow index in East Asia and in reconstructed PDO.…”

“…Kuwae et al (2017) also reported that since the late 15th century, the SDR variability nearly coincided with good/poor cycles in Japanese archives of catch records obtained from the Kanto area of Honshu Island to the northeast of Kyushu Island. Kuwae et al (2017) detected a multicentennial coherency in the variability of sardine abundance with variability in the abnormal snow index in East Asia and in reconstructed PDO. This coherency is consistent with the findings of Checkley et al (2017), who concluded that sardine and anchovy populations are primarily controlled by climate variability (bottom-up factors), and secondarily by top-down and intrinsic traits of the species.…”

“…Thus, synchronized sardine/anchovy cycles coupled with global or basin-scale climatic/oceanographic jumps or shifts lead to the concept of "regime shift" (Kawasaki 1983(Kawasaki , 2013Lluch-Belda et al 1989). Kuwae et al (2017) demonstrated that the Japanese sardine scale deposition rate (SDR) over the last 2850 years, obtained from Beppu Bay, Southern Japan (Fig. 1) indicated periodicities at approximately 50, 100, and 300 years, whereas the SDR variations in Japanese anchovy showed periodicities at approximately 30 and 260 years.…”

Time Machine Biology: Cross-Timescale Integration of Ecology, Evolution, and Oceanography

“…Although seasonal and annual signals are likely smoothed by bioturbation in many of these sediment cores, it is minimized in cores from anoxic basins. By using these minimally disturbed cores, decadal community changes can be reconstructed to bridge the gaps across timescales (Kuwae et al, 2017;Salvatteci et al, 2018; see the next section).…”

“…Fish-scale paleobiological studies have similarly provided insight on baseline variability in fish populations. For example, marginal marine and continental margin sediments in the Pacific extended population dynamics for anchovy and sardines back to the nineteenth century and past millennia (Baumgartner et al, 1992;Field et al, 2009;Checkley et al, 2017;Kuwae et al, 2017;Salvatteci et al, 2018). These records show that fish population dynamics are more complex and region-specific than those perceived based on twentieth-century fishery data, with a clear Pacific-wide correlation between anchovy and sardine populations and Pacific Decadal Oscillations (Chavez et al, 2003;Kuwae et al, 2017;Salvatteci et al, 2018).…”