Disentangling the effects of climate and density-dependent factors on spatiotemporal dynamics of Japanese sardine spawning

Furuichi, Sho; Yasuda, Tohya; Kurota, Hiroyuki; Yoda, Masaki; Suzuki, Kei; Takahashi, Motomitsu; Fukuwaka, Masa‐aki

doi:10.3354/meps13169

Cited by 29 publications

(26 citation statements)

References 39 publications

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“…For fisheries management to be able to respond to changes in fish productivity and distribution in the Bering Sea, the first step is to identify which species are most affected. Quantitatively identifying and assessing changes in fish productivity and distribution in response to climate is a rapidly developing research topic in ecology, oceanography, and fisheries (Furuichi et al., 2020; Holsman et al., 2019; Schmidt et al., 2019; Thorson, Ianelli, et al, 2016; Thorson, Pinsky, & Ward, 2016; Tommasi et al., 2017; Torre, Tanaka, & Chen, 2019).…”

Section: Introductionmentioning

confidence: 99%

Adapting to climate‐driven distribution shifts using model‐based indices and age composition from multiple surveys in the walleye pollock (Gadus chalcogrammus) stock assessment

O'Leary

Thorson

Ianelli

et al. 2020

Fisheries Oceanography

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Section: Introductionmentioning

confidence: 99%

Adapting to climate‐driven distribution shifts using model‐based indices and age composition from multiple surveys in the walleye pollock (Gadus chalcogrammus) stock assessment

O'Leary

Thorson

Ianelli

et al. 2020

Fisheries Oceanography

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“…Nonetheless, changes in stock demography (and thus in 'spawning strength') could influence mackerel recruitment variability. Note for example that the spatial and temporal extent of spawning paralleled the truncation of the stock's age structure and biomass (as for Japanese sardine 55 ). Indeed, a temporal difference in the timing of spawning between age classes is known for mackerel, and fewer fish are likely to spawn over a reduced temporal and geographical range 41 .…”

Section: Discussionmentioning

confidence: 99%

A fine-scale multi-step approach to understand fish recruitment variability

Brosset

Smith

Plourde

et al. 2020

Sci Rep

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Recruitment is one of the dominant processes regulating fish population productivity. It is, however, notoriously difficult to predict, as it is the result of a complex multi-step process. Various fine-scale drivers might act on the pathway from adult population characteristics to spawning behaviour and egg production, and then to recruitment. Here, we provide a holistic analysis of the Northwest Atlantic mackerel recruitment process from 1982 to 2017 and exemplify why broad-scale recruitment–environment relationships could become unstable over time. Various demographic and environmental drivers had a synergetic effect on recruitment, but larval survival through a spatio-temporal match with prey was shown to be the key process. Recruitment was also mediated by maternal effects and a parent–offspring fitness trade-off due to the different feeding regimes of adults and larvae. A mismatch curtails the effects of high larval prey densities, so that despite the abundance of food in recent years, recruitment was relatively low and the pre-existing relationship with overall prey abundance broke down. Our results reaffirm major recruitment hypotheses and demonstrate the importance of fine-scale processes along the recruitment pathway, helping to improve recruitment predictions and potentially fisheries management.

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“…1a). Of these, 24,037,24,388,22,118, and 38,651 protein sequences are allocated unique accession numbers for Atlantic herring, zebrafish, medaka, and the NCBI nr database, respectively (Fig. 1a).…”

Section: Assembly and Functional Annotationmentioning

confidence: 99%

“…The Japanese sardine has been a key species for studies of population dynamics because of its high level of population fluctuation [21]. Although some evidence of the mechanisms of population dynamics has been presented from an ecological perspective [21][22][23][24][25], the available information on aspects of the endocrine regulation of ovarian development is still limited. RNA-seq was performed using sardine brain, pituitary, and gonad from both sexes to generate a high-quality transcriptome assembly.…”

Section: Introductionmentioning

confidence: 99%

Transcriptome characterization of BPG axis and expression profiles of ovarian steroidogenesis-related genes in the Japanese sardine

Nyuji

Hongo

Yoneda³

et al. 2020

BMC Genomics

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Background The clupeoid fishes are ecologically and commercially important fish species worldwide that exhibit a high level of population fluctuation, accompanied by alteration of reproductive traits. However, knowledge about their reproductive physiology in order to understand mechanisms underlying such population dynamics is limited. The endocrine system along with the brain–pituitary–gonadal (BPG) axis is critical for regulating reproduction. The aims of this study were to provide transcript data and genes related to the BPG axis, and to characterize the expression profiles of ovarian steroidogenesis-related genes in the Japanese sardine (Sardinops melanostictus, Clupeidae). Results RNA sequencing was performed using the sardine brain, pituitary, and gonad in both sexes. A total of 290,119 contigs were obtained and 115,173 non-redundant ORFs were annotated. The genes differentially expressed between ovary and testis were strongly associated with GO terms related to gamete production. The tissue-specific profile of the abundance of transcripts was characterized for the major regulators in the BPG axis, such as gonadotropin-releasing hormone, gonadotropin, and steroidogenic enzyme. By comparing between ovary and testis, out of eight different 17β-hydroxysteroid dehydrogenase (Hsd17b) genes identified, higher hsd17b7 expression was found in testis, whereas higher expression of hsd17b8, hsd17b10, hsd17b12a, and hsd17b12b was found in ovary. The cDNAs encoding key endocrine factors in the ovarian steroidogenic pathway were cloned, sequenced, and quantitatively assayed. In the pituitary, follicle-stimulating hormone beta peaked during vitellogenesis, while luteinizing hormone beta peaked at the completion of vitellogenesis. In the ovary, follicle-stimulating hormone receptor and luteinizing hormone receptor were upregulated from mid- to late phase of vitellogenesis. Furthermore, three steroidogenic enzyme genes (cyp11a1, cyp17a1, and cyp19a1a) gradually increased their expression during ovarian development, accompanying a rise in serum estradiol-17β, while 3β-hydroxysteroid dehydrogenase and steroidogenic acute regulatory protein did not change significantly. Conclusions This is the first report of deep RNA sequencing analysis of Japanese sardine, in which many key genes involved in the BPG axis were identified. Expression profiles of ovarian steroidogenesis-related genes provide a molecular basis of the physiological processes underlying ovarian development in the sardine. Our study will be a valuable resource for clarifying the molecular biology of clupeoid fishes.

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Disentangling the effects of climate and density-dependent factors on spatiotemporal dynamics of Japanese sardine spawning

Cited by 29 publications

References 39 publications

Adapting to climate‐driven distribution shifts using model‐based indices and age composition from multiple surveys in the walleye pollock (Gadus chalcogrammus) stock assessment

Adapting to climate‐driven distribution shifts using model‐based indices and age composition from multiple surveys in the walleye pollock (Gadus chalcogrammus) stock assessment

A fine-scale multi-step approach to understand fish recruitment variability

Transcriptome characterization of BPG axis and expression profiles of ovarian steroidogenesis-related genes in the Japanese sardine

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