Contrasting life-history responses to climate variability in eastern and western North Pacific sardine populations

Sakamoto, Tatsuya; Takahashi, Motomitsu; Chung, Ming‐Tsung; Rykaczewski, Ryan R.; Komatsu, Kosei; Shirai, Kotaro; Ishimura, Toyoho; Higuchi, Tomihiko

doi:10.1038/s41467-022-33019-z

Cited by 15 publications

(8 citation statements)

References 64 publications

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“…Additionally, larger sardines were distributed in colder or more northern environments. These results are consistent with the migration patterns of Japanese sardine and chub mackerel (see section 2.1) and the habitat preference suggested in a previous study (Sakamoto et al, 2022). Thus, our results indicate that Japanese sardine and chub mackerel exhibit phenotype-specific and growth-stage-specific habitat use, and these habitat uses likely contribute to the formation and maintenance of structured groups in these species.…”

Section: Discussionsupporting

confidence: 93%

Group composition and its ontogenetic changes in marine pelagic fishes

Furuichi,

Suzuki,

Kamimura

et al. 2024

Preprint

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Group living is a widespread phenomenon among animals and an important trait in fishes. Understanding group composition and its dynamics is fundamental for elucidating ecological and evolutionary processes in natural populations of gregarious animal species, including fishes, but our knowledge of group composition in marine fishes is limited. Here, we examined group composition and its ontogenetic change in two marine fishes, Japanese sardine (Sardinops melanostictus) and chub mackerel (Scomber japonicus). We found that, at the juvenile stage, groups were composed of individuals with similar body length, age, and growth history. At the sub-adult stage, although body length within a group remained similar, the within-group similarity in age and growth history decreased, approaching the level expected when groups were randomly composed. Therefore, during the early life history, individuals form groups with those spawned at approximately the same time and place (i.e., those from the same batch). As they develop, however, individuals of various origins intermingle and selectively form groups with others exhibiting similar phenotypes. We further found that environmental and geographical factors were also related to the body size and age of individuals distributed. This indicates that Japanese sardine and chub mackerel exhibit phenotype-specific and growth-stage-specific habitat use, which also contributes to the formation and maintenance of structured groups. Our findings provide valuable information on group composition, its ontogenetic change, and its underlying mechanisms in marine fishes, for which the information is limited. These insights may help to clarify ecological and evolutionary processes such as population dynamics, density-dependent phenomena, and the evolution of grouping behaviour in small pelagic fishes.

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Section: Discussionsupporting

confidence: 93%

Group composition and its ontogenetic changes in marine pelagic fishes

Furuichi,

Suzuki,

Kamimura

et al. 2024

Preprint

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“…The distribution of estimates of T lim based on both breakpoint and quadratic linear model fits across the Monte Carlo simulations is shown in Table 1 . The range of C resp values expressed at a given temperature has been inferred to reflect the field-realised aerobic scope 27 , 39 . As the total range of expressed values within a population is related to the population size, we draw on the inter-quartile range as a more robust metric of population distribution, and limited inferences to cases with more than 15 observations for any given inferred integer temperature value.…”

Section: Methodsmentioning

confidence: 99%

“…Consequently, each otolith provides a record of the temperature experienced by an individual fish and the associated field metabolic rate sustained by the fish averaged over a time period dependent on the amount of otolith material sampled. If physiological performance in the field is influenced by the temperature experienced by individual fish, temperature and FMR otolith proxies across a population will describe field thermal performance curves 22 , 24 , 39 . Otolith stable isotope data can, therefore, be used to infer the distribution of temperatures experienced by individuals, and to describe thermal performance curves for absolute field metabolic rate 24 .…”

Section: Introductionmentioning

confidence: 99%

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Thermal sensitivity of field metabolic rate predicts differential futures for bluefin tuna juveniles across the Atlantic Ocean

Trueman,

Artetxe-Arrate,

Kerr

et al. 2023

Nat Commun

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Changing environmental temperatures impact the physiological performance of fishes, and consequently their distributions. A mechanistic understanding of the linkages between experienced temperature and the physiological response expressed within complex natural environments is often lacking, hampering efforts to project impacts especially when future conditions exceed previous experience. In this study, we use natural chemical tracers to determine the individual experienced temperatures and expressed field metabolic rates of Atlantic bluefin tuna (Thunnus thynnus) during their first year of life. Our findings reveal that the tuna exhibit a preference for temperatures 2–4 °C lower than those that maximise field metabolic rates, thereby avoiding temperatures warm enough to limit metabolic performance. Based on current IPCC projections, our results indicate that historically-important spawning and nursery grounds for bluefin tuna will become thermally limiting due to warming within the next 50 years. However, limiting global warming to below 2 °C would preserve habitat conditions in the Mediterranean Sea for this species. Our approach, which is based on field observations, provides predictions of animal performance and behaviour that are not constrained by laboratory conditions, and can be extended to any marine teleost species for which otoliths are available.

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“…The δ 18 O and δ 13 C of these powders were measured with isotope ratio mass spectrometers 200 with an analytical precision better than ± 0.13 and 0.11‰, respectively, based on the 201 methods described by and Ishimura et al (2004) data from age-0 sardines collected in the Pacific offshore region in 2010, 2014 and 2015 (Sakamoto et al, 2022) and in the SJ-ECS in 2015 were also included in the following analyses to allow more comprehensive comparisons (Table 1). See Supplementary Materials and Methods for more details.…”

mentioning

confidence: 99%

Fisheries shocks provide an opportunity to reveal multiple recruitment sources of sardine in the Sea of Japan

Sakamoto,

Takahashi,

Shirai

et al. 2024

Preprint

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1. Understanding the sources of recruits is essential for stock assessments of marine fish populations. In 2014 and 2019, schools of Japanese sardine in the Sea of Japan and the East China Sea (SJ-ECS), which arrive in Japanese coastal areas for spawning each spring were shockingly sparse. Abundances of eggs and juveniles also showed abrupt declines, suggesting that sardine reproduction in the SJ-ECS was severely limited during these years. However, in spring of 2015 and 2020 age-1 fish appeared as usual in the coastal areas, along with fish of other ages, challenging the current assumption that sardine in the system is a self-recruiting subpopulation.2. To test the self-recruiting hypothesis, we analysed the stable oxygen and carbon isotopes (δ18O, δ13C) for otolith areas formed during the first spring and summer in otoliths of age-0 and age-1 sardines in 2010 and 2013–2015 year-classes captured in the SJ-ECS, as indices of temperature and metabolic trajectories. 3. Age-0 sardines generally showed a significant decrease in otolith δ18O from spring to summer, reasonably reflecting seasonal warming in the SJ-ECS. However, the majority of age-1 captured in spring 2011, 2015 and 2016 showed non-decreasing profiles of otolith δ18O, suggesting that the age-0 off the Japanese coast were not the main source of recruitment. The δ18O for summer thus indicates different migration groups: the “locals" growing up off the Japanese coast and the migrating “nonlocals". 4. The isotope ratios of the “nonlocals” overlapped with those of age-0 captured in the subarctic western North Pacific, suggesting that the “nonlocals” may be migrants from the Pacific, or perhaps an unsampled potential northward migration group in the SJ-ECS. Only in 2014 did the majority of age-1 consist of the “locals”, suggesting that the abrupt decline in catches was caused by the absence of the “nonlocals” and accompanying adults. 5. Synthesis and applicationsOur results highlight the significant uncertainty in the population structure assumed for the current stock assessment models for Japanese sardine. Concentrated investigations on recruitment processes to test and quantify the potential migration groups are recommended to improve the assessment model.

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Contrasting life-history responses to climate variability in eastern and western North Pacific sardine populations

Cited by 15 publications

References 64 publications

Group composition and its ontogenetic changes in marine pelagic fishes

Group composition and its ontogenetic changes in marine pelagic fishes

Thermal sensitivity of field metabolic rate predicts differential futures for bluefin tuna juveniles across the Atlantic Ocean

Fisheries shocks provide an opportunity to reveal multiple recruitment sources of sardine in the Sea of Japan

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