Variations in female swordtip squid Uroteuthis edulis life history traits between southern Japan and northern Taiwan (Northwestern Pacific)

Pang, Yumeng; Chen, Chih-Shin; Iwata, Yoko

doi:10.1007/s12562-020-01465-7

Cited by 11 publications

(10 citation statements)

References 57 publications

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“…The ML at hatching (L 0 ) of U. edulis is 2.2 mm (Toyofuku and Wada 2018). There are no reports of BW at hatching (W 0 ) in this species, so it was assumed to be 1.7 mg based on the mean wet-weight of ripe eggs in U. edulis (Pang et al 2020). The growth rates for each maturity status among the different cohorts, and for each cohort among different maturity statuses, were compared using one-way ANOVA and Tukey's pairwise post hoc test.…”

Section: Discussionmentioning

confidence: 99%

“…Third, the previous studies have shown great variability in U. edulis LHTs in different environments. Female squids in Japanese populations have a higher growth rate when they hatch in a warm season than they do if they hatch in a cold season, and they mature at a younger age and smaller size in Taiwan than in Japan (Pang et al 2020). Also, in Japanese waters, male squids that hatch in a warm season display a higher growth rate than those hatching in a cold season (Natsukari et al 1988); and male squids in northern Taiwan caught in spring mature at a smaller size than those caught in autumn (Wang et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Environmental influence on life-history traits in male squid Uroteuthis edulis with alternative reproductive tactics

et al. 2022

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Squid are characterized by flexible life-history traits (LHTs) that change in response to changing oceanic parameters. Male alternative reproductive tactics (ARTs), characterized by large-sized ‘consorts’ versus small-sized ‘sneakers’, are commonly observed in loliginid species. This study reports on LHTs flexibility in male squids displaying ARTs. LHTs of consorts and sneakers in Uroteuthis edulis, including body size, age, growth rate and gonado-somatic energy allocation, were compared among seasonal and geographical groups from Japan and Taiwan. The ratio of consorts to sneakers was highest in the group spawning in the ‘Japan-warm’ season (June–November), followed by that of the ‘Japan-cold’ season (December–May), and lowest in Taiwan (spring and autumn). LHTs were compared among cohorts separated by hatching season and catch location (Jwarm, Jcold and Taiwan cohorts). Mean body size of consorts showed no difference among cohorts, although Taiwan consorts were relatively younger than Japan consorts. Mean size and age of sneakers decreased with increased water temperature at hatching. Growth rates of consorts and sneakers were slightly different among cohorts, in accordance with differences of statolith increment widths during their early life stage (50–150 days). Growth rates of both consorts and sneakers were highest in the Taiwan cohort, followed by the Jwarm cohort, with the Jcold cohort lowest. Sneakers invested more both in mantle and gonadal weights than consorts in all cohorts. Gonado-somatic energy allocation patterns of consorts and sneakers were consistent at different temperatures. LHTs of U. edulis consorts and sneakers were strongly influenced by temperature, with higher flexibility in sneakers than consorts.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Environmental influence on life-history traits in male squid Uroteuthis edulis with alternative reproductive tactics

et al. 2022

Self Cite

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show abstract

“…The ML at hatching (L 0 ) of U. edulis is 2.2 mm (Toyofuku and Wada, 2018). There are no reports of BW at hatching (W 0 ) in this species, so it was assumed to be 1.7 mg based on the mean wet weight of ripe eggs in U. edulis (Pang et al, 2020). The growth rates for each maturity status among the different cohorts, and for each cohort among different maturity statuses, were compared using one-way ANOVA and Tukey's pairwise post-hoc test.…”

Section: Discussionmentioning

confidence: 99%

“…Thirdly, previous studies have shown great variability in U. edulis LHTs in different environments. Female squids in Japanese populations have a higher growth rate when they hatch in a warm season than they do if they hatch in a cold season, and they mature at a younger age and smaller size in Taiwan than in Japan (Pang et al, 2020). Also, in Japanese waters, male squids that hatch in a warm season display a higher growth rate than those hatching in a cold season (Natsukari et al 1988); and male squids in northern Taiwan caught in spring mature at a smaller size than those caught in autumn (Wang et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Environmental Influence on Life-History Traits in Male Squid Uroteuthis Edulis With Alternative Reproductive Tactics

Pang

Chen

Kawamura

et al. 2021

Preprint

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Squid are characterized by flexible life-history traits (LHTs) that change in response to changing oceanic parameters. Male alternative reproductive tactics (ARTs), characterized by large-sized ‘consorts’ versus small-sized ‘sneakers’, are commonly observed in loliginid species. This study reports on LHTs flexibility in male squids displaying ARTs. LHTs of consorts and sneakers in Uroteuthis edulis, including body size, age, growth rate and gonado-somatic energy allocation, were compared among seasonal and geographical groups from Japan and Taiwan. The ratio of consorts to sneakers was highest in the group spawning in the ‘Japan-warm’ season (June-November), followed by that of the ‘Japan-cold’ season (December-May), and lowest in Taiwan (spring and autumn). LHTs were compared among cohorts separated by hatching season and catch location (Jwarm, Jcold and Taiwan cohorts). Mean body size of consorts showed no difference among cohorts, although Taiwan consorts were relatively younger than Japan consorts. Mean size and age of sneakers decreased with increased water temperature at hatching. Growth rates of consorts and sneakers were slightly different among cohorts, in accordance with differences of statolith increment widths during their early life stage (50-150 d). Growth rates of both consorts and sneakers were highest in the Taiwan cohort, followed by the Jwarm cohort, with the Jcold cohort lowest. Sneakers invested more both in mantle and gonadal weights than consorts in all cohorts. Gonado-somatic energy allocation patterns of consorts and sneakers were consistent at different temperatures. LHTs of U. edulis consorts and sneakers were strongly influenced by temperature, with higher flexibility in sneakers than consorts.

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“…In addition, the runoff of the Yangtze River and the offshore expansion of nutrient concentration in summer also affect the nutrient level and habitat of paralarvae (Robin et al, 2014; Umezawa et al, 2014). During the transition from larval stage to adult stage, the seasonal and annual strength of different currents affect the growth rate and reproductive accumulation of the stock in the feeding ground (Pang et al, 2020; Wang et al, 2013). Therefore, the biotic and abiotic environments of the spring stock show the differences among various life history stages, which affect individual growth and their responses to environmental variations (Li et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Ontogenetic growth responses to the environmental changes of the swordtip squid (Uroteuthis edulis) spring stock in the East China Sea

Li,

Han,

Chen

et al. 2024

Fisheries Oceanography

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Swordtip squid (Uroteuthis edulis) is characterized by a complex population structure and rapid generation renewal and sensitive to habitat changes. Its population growth response to environmental variations implies its flexible life history traits. In this study, with the samples collected in the north‐central waters of the East China Sea from 2017 to 2021, the daily growth of the spring stock was analyzed based on the age and increment width of statolith. The gradient forest method (GFM) and generalized additive mixed models (GAMMs) were used to explore the changes in the weights of environmental variables and the relationships between daily growth and environmental variables in various growth stages. The age of the samples collected from 2017 to 2021 mainly ranged from 180 to 240 days, and the spring stock was the dominant stock. According to the distance from daily increment to core in the statolith, the life history of the spring stock was divided into four growth stages (S1 embryo–larval stage, S2 juvenile stage, S3 subadult stage, and S4 adult stage). For the spring stock, the cumulative weight of temperature and salinity in the population growth was the largest in S1 stage; the cumulative weight of temperature and velocity was the largest in S2 stage; the cumulative weight of temperature was the largest in S3 stage; and the cumulative weight of mixed layer depth (MLD), temperature, and salinity was the largest in S4 stage. The relationship between temperature at the depth of 25 m (T25) and daily growth of the spring stock was first positively correlated (S1–S2), then negatively correlated (S3), and finally positively correlated (S4). The relationship between environment variable and growth of the spring stock gradually decreased with the increase in MLD (30 to 50 m) and SSS (S3–S4, 32.2‰ to 33.2‰) and gradually increased with the increase in the velocity of currents (S1, .1 to .2 m/s). The differences in the responses of the spring stock to environmental variations in different growth stages may lead to the changes in the growth traits for the spring stock. This study provides a scientific basis for a comprehensive understanding of the life history traits of U. edulis.

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Variations in female swordtip squid Uroteuthis edulis life history traits between southern Japan and northern Taiwan (Northwestern Pacific)

Cited by 11 publications

References 57 publications

Environmental influence on life-history traits in male squid Uroteuthis edulis with alternative reproductive tactics

Environmental influence on life-history traits in male squid Uroteuthis edulis with alternative reproductive tactics

Environmental Influence on Life-History Traits in Male Squid Uroteuthis Edulis With Alternative Reproductive Tactics

Ontogenetic growth responses to the environmental changes of the swordtip squid (Uroteuthis edulis) spring stock in the East China Sea

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