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Early life history affects fish size mainly by indirectly regulating the growth during each stage:a case study in a demersal fish

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Marine Life Science & Technology 2023年第1期5卷 75-84页

作者： Rui Wu Qinghuan Zhu Satoshi Katayama Yongjun Tian Jianchao Li Kunihiro Fujiwara Yoji Narimatsu Frontiers Science Center for Deep Ocean Multispheres and Earth System(FDOMES)and Key Laboratory of Mariculture Ministry of EducationOcean University of China5 Yushan RoadQingdao266003China Graduate School of Agricultural Science Tohoku University1-1 Tsutsumidori AmamiyamachiAobaSendai981-8555Japan Laboratory for Marine Fisheries Science and Food Production Processes Pilot National Laboratory for Marine Science and TechnologyQingdao266237China Niigata Field Station Fisheries Resources InstituteJapan Fisheries Research and Education AgencyYokohama220-6115Japan Hachinohe Field Station Fisheries Resources InstituteJapan Fisheries Research and Education AgencyYokohama220-6115Japan

The complex life histories of demersal fishes are artificially separated into multiple stages along with changes in morphology and *** is worth exploring whether the phenotypes expressed earlier and later during the life cycle are related or *** life stages of first year Pacific cod(Gadus macrocephalus)were tracked over different hatch years and regions to test whether the early life history had a long-lasting effect on subsequent *** further explored the contribution of growth in the early and subsequent life history stages to body size at the end of each *** addition to the accessory growth centre and the first annual ring,the other two checks on the otolith possibly related to settlement and entering deeper waters were identified in 75 Pacific cod *** direct and indirect relationships among the life history stages was interpreted based on path *** results showed that growth prior to the formation of the accessory growth centre had a significant effect on the absolute growth of the fish before and after settlement and migration to deep ***,there was no or moderate evidence that early growth affected the body size at each stage,which was mainly regulated by growth during the *** study supports the lasting effect of early growth and clarifies that it affects size mainly by indirectly regulating staged *** the phenotype relationships and identifying the internal mechanisms form the basis for assessing population dynamics and understanding the processes behind the changes.

关键词： Early life history Gadus macrocephalus Otolith Path analysis staged growth Body size

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International Journal of Ophthalmology(English edition) 2022年第10期15卷 1591-1597页

作者： Yin-Hao Wang Jing Zhong Xue-Min Li Department of Ophthalmology Peking University Third HospitalBeijing 10091China Beijing Key Laboratory of Restoration of Damaged Ocular Nerve Peking University Third HospitalBeijing 10091China Education Department Peking University Third HospitalBeijing 10091China

AIM: To explore the changes in lens thickness and density with ***: A Chinese population-based retrospective study was performed. A total of 497 individuals(490 right eyes and 495 left eyes), ranging from 3 to 69 years old were included. Lens images obtained from IOL Master 700 were used to measure lens thickness and density. Piecewise regression model was chosen to illustrate the relationship of lens thickness and density with ***: The proportion of people aged 3-18, 19-40, over 40 was 38.6%, 50.9% and 10.5% respectively. The whole lens thickness decreased with age during the first 7 years of life, kept stable from 8 to 16 years old, and then increased at the rate of about 27 μm per year. The thickness of the lens cortex and nucleus tended to decrease first and then increase with age, which was dependent on age stages. The whole lens density also decreased with age until 7 years old. The increasing rate of lens density was different in different age groups. The whole lens density increased rapidly from 7 to 22 years old and slowed down after 22 years old. Similarly, the changing tendency of lens cortical and nuclear density differed in different age phases. CONCLUSION: Both lens thickness and density are significantly associated with age, whereas they do not change linearly with age. Moreover, it is necessary to increase the population over 40 years old and conduct further research.

关键词： lens thickness lens density age staged growth

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A Two-Step growth Curve: Approach to the von Bertalanffy and Gompertz Equations

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Advances in Pure Mathematics 2016年第5期6卷 321-330页

作者： Laura Rogers-Bennett Donald W. Rogers California Department of Fish and Wildlife and Karen C. Drayer Wildlife Health Center UC Davis CA USA Bodega Marine Laboratory Bodega Bay CA USA Chemistry Department Long Island University Brooklyn NY USA Friday Harbor Laboratories Whiteley Center University of Washington Friday Harbor WA USA

Many curves have been proposed and debated to model individual growth of marine invertebrates. Broadly, they fall into two classes, first order (e.g. von Bertalanffy) and sigmoidal (e.g. Gompertz). We provide an innovative approach which demonstrates that the growth curves are not mutually exclusive but that either may arise from a simple three-stage growth model with two steps (k1 and k2) depending on the ratio of the growth parameters . The new approach predicts sigmoidal growth when is close to 1, but if either growth from stage A to stage B or B to C is fast relative to the other, the slower of the two steps becomes the growth limiting step and the model reduces to first order growth. The resulting curves indicate that there is a substantial difference in the estimated size at time t during the period of active growth. This novel two-step rate model generates a growth surface that allows for changes in the rate parameters over time as reflected in the new parameter n(t) = k1(t) - k2(t). The added degree of freedom brings about individual growth trajectories across the growth surface that is not easily mapped using conventional growth modeling techniques. This two (or more) stage growth model yields a growth surface that allows for a wide range of growth trajectories, accommodating staged growth, growth lags, as well as indeterminate growth and can help resolve debates as to which growth curves should be used to model animal growth. This flexibility can improve estimates of growth parameters used in population models influencing model outcomes and ultimately management decisions.=

关键词： growth Model growth Surface Rate Equation staged growth Population Models

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