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Tsutomu Ikeda - One of the best experts on this subject based on the ideXlab platform.

  • Vertical distribution, population structure and lifecycle of Eucalanus bungii (Copepoda: Calanoida) in the Oyashio region, with notes on its Regional variations
    Marine Biology, 2005
    Co-Authors: Satoko Shoden, Tsutomu Ikeda, Atsushi Yamaguchi
    Abstract:

    Vertical distribution and population structure of Eucalanus bungii were investigated at site H in the Oyashio region (western subarctic Pacific) from September 1996 through October 1997 to evaluate the species’ lifecycle pattern and associated ontogenetic vertical migration. Additional temporary samplings were also made at several stations covering the entire subarctic Pacific, Okhotsk Sea and Japan Sea, as a basis for Regional Comparison of lifecycle features of this species. At site H, a marked phytoplankton bloom occurred from mid-March to June, and E. bungii spawned in April/May in the surface layer. Resulting nauplii and copepodite stage 1 (C1) formed a prominent abundance peak in early June. The C1 developed and reached C5 by August. The development of nauplii through C4 occurred in the surface layer. From August onwards, C5 and a small fraction of C3–C4 sank gradually deeper, and entered diapause to overwinter at >500 m depth. The C5 molted to C6 males and females in February and March, respectively. The C6 males and females mated at 250–500 m depth, and only mated C6 females ascended to the surface layer in April for spawning. Judging from the size of lipid droplets in the body, the C3–C5 specimens deposited lipids in the body through the phytoplankton bloom period, and the lipids were consumed gradually during overwintering. Taking account of sampling season, temporal changes in population structure, and vertical distribution, the data collected from the western subarctic Pacific and Okhotsk Sea are consistent with a 1-year lifecycle for the site H population, while the data from the central and eastern subarctic Pacific were consistent with a 2-year lifecycle. The populations from the southern and southeastern Japan Sea did not fit the features of either lifecycle scenario, and because of their very small population size it is suggested that they originated from the northern Japan Sea. Regional Comparison of the prosome length of C6 females, including those in the Bering Sea, indicated significantly larger specimens from the Japan Sea and Okhotsk Sea, and smaller specimens in the eastern subarctic Pacific, as compared with those in the western subarctic Pacific (including site H) and Bering Sea. A possible overwintering mechanism of E. bungii is discussed.

  • life cycle of neocalanus flemingeri crustacea copepoda in the oyashio region western subarctic pacific with notes on its Regional variations
    Marine Ecology Progress Series, 2001
    Co-Authors: Toru Kobari, Tsutomu Ikeda
    Abstract:

    The life cycle of Neocalanus flemingeri was investigated by analyzing population struc- ture data collected monthly at Site H in the Oyashio region, Japan, from September 1996 through October 1997. Additional non-time-series sampling was also done at several stations covering the entire subarctic Pacific, Japan Sea and Okhotsk Sea, as a basis for Regional Comparison of the differ- ing life cycles and body sizes of this species. At Site H, N. flemingeri spawned between January and February below 250 m depth. Copepodite Stage 1 (C1) occurred in March, and most of these had developed into C5 by early June, i.e. by the end of the phytoplankton bloom. A portion of the C4 pop- ulation ceased development and remained at the thermocline to 500 m layer throughout the year. The remainder developed to C5, then migrated to 250-2000 m depth in June, and matured immediately. C6 males were present in May to July and died immediately thereafter. C6 females were observed in June to December with immature gonads and in January to February with fully mature gonads. The life cycle of N. flemingeri was estimated as annual for most of the population, but the small popula- tion overwintering as C4 may have a biennial life cycle. While the prosome length distributions of the C2, C3, C6 males and C6 females were unimodal, C4 and C5 exhibited bimodality. We believe this bimodality reflects sexual dimorphism for C4 and C5. Possible development sequences of each of the 2 size groups are proposed in relation to annual and biennial life cycles of N. flemingeri. Temporal population-structure data in other regions suggested an annual life cycle for the populations in the central-eastern subarctic Pacific, and a possible mixture of various degrees of annual/biennial life cycles for the populations in the western subarctic Pacific, Japan Sea and Okhotsk Sea. Geographi- cal Comparison of the prosome length of the C6 females between the Oyashio (Site H) and other regions indicated significantly larger specimens in the Okhotsk Sea, with smaller individuals in the eastern and part of the western subarctic Pacific. Possible causes for regionl variability in life cycle and body size are discussed.

  • vertical distribution population structure and life cycle of neocalanus cristatus crustacea copepoda in the oyashio region with notes on its Regional variations
    Marine Biology, 1999
    Co-Authors: Toru Kobari, Tsutomu Ikeda
    Abstract:

    Vertical distribution and population structure of Neocalanus cristatus were investigated at Site H in the Oyashio region from September 1996 through October 1997 to evaluate their life cycle mode. Additional temporary samplings were also made at several stations covering the entire subarctic Pacific, Okhotsk Sea and Japan Sea, as a basis for Regional Comparison of life cycles of this species. At Site H, N. cristatus spawned throughout the year below 500 m depth, with a peak from October to December. The resulting eggs and nauplii floated/migrated upward, and formed an abundance peak of Copepodite Stage 1 (C1) in the surface layer in February. In the surface layer, the C1 developed and reached C5 by early June through a phytoplankton bloom which occurred in mid-March to end of June. The C5 migrated to deeper layers in July and August, where they molted to adults. Apparently, the developmental time from C5 to adults was highly variable (>1 month), and some might overwinter. The life cycle of N. cristatus appeared to be annual for the major portion of the population. Taking into account sampling season, temporal changes in vertical distribution and population structure data collected from regions other than Site H, there was a close correlation in the timing of the life cycle over the entire subarctic Pacific, but the reproduction season (April to June) was observed to be different in the Okhotsk and Japan Sea populations. Regional Comparison of prosome length of C5 individuals, including those in the Bering Sea, indicated significantly larger sizes of specimens from the Japan Sea and Okhotsk Sea, as compared with those from the entire subarctic Pacific. Possible causes for Regional variability in life cycle patterns and body sizes are discussed.

Sheng Dai - One of the best experts on this subject based on the ideXlab platform.

  • Regional eco-innovation in China: An analysis of eco-innovation levels and influencing factors
    Journal of Cleaner Production, 2017
    Co-Authors: Jun Chen, Jinhua Cheng, Sheng Dai
    Abstract:

    Eco-innovation has become a core engine for long-term stable economic development, as well as a fundamental way to ease the tension between economic growth and environmental resources management. Through the construction of a measurement index system, this paper evaluates the level of Regional eco-innovation in 30 Chinese provinces from 2000 to 2014. This paper also employs panel data analysis to study the factors that influence Chinese Regional eco-innovation. The results show that, during the observation period, the levels of eco-innovation increased significantly overall. However, the Regional Comparison of the eco-innovation index revealed an obvious, gradually decreasing distribution pattern from east to west. Factors such as technology push, market pull, and environmental regulation pull have positive but differentiated influences on the eco-innovation throughout China and among the eastern, central and western regions. Based on these heterogeneous influences and the targets of ecological civilization construction, promoting the Regional synergy of technology push, market pull, and environmental regulation pull is necessary to improve the level of eco-innovation in China.

Toru Kobari - One of the best experts on this subject based on the ideXlab platform.

  • life cycle of neocalanus flemingeri crustacea copepoda in the oyashio region western subarctic pacific with notes on its Regional variations
    Marine Ecology Progress Series, 2001
    Co-Authors: Toru Kobari, Tsutomu Ikeda
    Abstract:

    The life cycle of Neocalanus flemingeri was investigated by analyzing population struc- ture data collected monthly at Site H in the Oyashio region, Japan, from September 1996 through October 1997. Additional non-time-series sampling was also done at several stations covering the entire subarctic Pacific, Japan Sea and Okhotsk Sea, as a basis for Regional Comparison of the differ- ing life cycles and body sizes of this species. At Site H, N. flemingeri spawned between January and February below 250 m depth. Copepodite Stage 1 (C1) occurred in March, and most of these had developed into C5 by early June, i.e. by the end of the phytoplankton bloom. A portion of the C4 pop- ulation ceased development and remained at the thermocline to 500 m layer throughout the year. The remainder developed to C5, then migrated to 250-2000 m depth in June, and matured immediately. C6 males were present in May to July and died immediately thereafter. C6 females were observed in June to December with immature gonads and in January to February with fully mature gonads. The life cycle of N. flemingeri was estimated as annual for most of the population, but the small popula- tion overwintering as C4 may have a biennial life cycle. While the prosome length distributions of the C2, C3, C6 males and C6 females were unimodal, C4 and C5 exhibited bimodality. We believe this bimodality reflects sexual dimorphism for C4 and C5. Possible development sequences of each of the 2 size groups are proposed in relation to annual and biennial life cycles of N. flemingeri. Temporal population-structure data in other regions suggested an annual life cycle for the populations in the central-eastern subarctic Pacific, and a possible mixture of various degrees of annual/biennial life cycles for the populations in the western subarctic Pacific, Japan Sea and Okhotsk Sea. Geographi- cal Comparison of the prosome length of the C6 females between the Oyashio (Site H) and other regions indicated significantly larger specimens in the Okhotsk Sea, with smaller individuals in the eastern and part of the western subarctic Pacific. Possible causes for regionl variability in life cycle and body size are discussed.

  • vertical distribution population structure and life cycle of neocalanus cristatus crustacea copepoda in the oyashio region with notes on its Regional variations
    Marine Biology, 1999
    Co-Authors: Toru Kobari, Tsutomu Ikeda
    Abstract:

    Vertical distribution and population structure of Neocalanus cristatus were investigated at Site H in the Oyashio region from September 1996 through October 1997 to evaluate their life cycle mode. Additional temporary samplings were also made at several stations covering the entire subarctic Pacific, Okhotsk Sea and Japan Sea, as a basis for Regional Comparison of life cycles of this species. At Site H, N. cristatus spawned throughout the year below 500 m depth, with a peak from October to December. The resulting eggs and nauplii floated/migrated upward, and formed an abundance peak of Copepodite Stage 1 (C1) in the surface layer in February. In the surface layer, the C1 developed and reached C5 by early June through a phytoplankton bloom which occurred in mid-March to end of June. The C5 migrated to deeper layers in July and August, where they molted to adults. Apparently, the developmental time from C5 to adults was highly variable (>1 month), and some might overwinter. The life cycle of N. cristatus appeared to be annual for the major portion of the population. Taking into account sampling season, temporal changes in vertical distribution and population structure data collected from regions other than Site H, there was a close correlation in the timing of the life cycle over the entire subarctic Pacific, but the reproduction season (April to June) was observed to be different in the Okhotsk and Japan Sea populations. Regional Comparison of prosome length of C5 individuals, including those in the Bering Sea, indicated significantly larger sizes of specimens from the Japan Sea and Okhotsk Sea, as compared with those from the entire subarctic Pacific. Possible causes for Regional variability in life cycle patterns and body sizes are discussed.

Jun Chen - One of the best experts on this subject based on the ideXlab platform.

  • Regional eco-innovation in China: An analysis of eco-innovation levels and influencing factors
    Journal of Cleaner Production, 2017
    Co-Authors: Jun Chen, Jinhua Cheng, Sheng Dai
    Abstract:

    Eco-innovation has become a core engine for long-term stable economic development, as well as a fundamental way to ease the tension between economic growth and environmental resources management. Through the construction of a measurement index system, this paper evaluates the level of Regional eco-innovation in 30 Chinese provinces from 2000 to 2014. This paper also employs panel data analysis to study the factors that influence Chinese Regional eco-innovation. The results show that, during the observation period, the levels of eco-innovation increased significantly overall. However, the Regional Comparison of the eco-innovation index revealed an obvious, gradually decreasing distribution pattern from east to west. Factors such as technology push, market pull, and environmental regulation pull have positive but differentiated influences on the eco-innovation throughout China and among the eastern, central and western regions. Based on these heterogeneous influences and the targets of ecological civilization construction, promoting the Regional synergy of technology push, market pull, and environmental regulation pull is necessary to improve the level of eco-innovation in China.

Jinhua Cheng - One of the best experts on this subject based on the ideXlab platform.

  • Regional eco-innovation in China: An analysis of eco-innovation levels and influencing factors
    Journal of Cleaner Production, 2017
    Co-Authors: Jun Chen, Jinhua Cheng, Sheng Dai
    Abstract:

    Eco-innovation has become a core engine for long-term stable economic development, as well as a fundamental way to ease the tension between economic growth and environmental resources management. Through the construction of a measurement index system, this paper evaluates the level of Regional eco-innovation in 30 Chinese provinces from 2000 to 2014. This paper also employs panel data analysis to study the factors that influence Chinese Regional eco-innovation. The results show that, during the observation period, the levels of eco-innovation increased significantly overall. However, the Regional Comparison of the eco-innovation index revealed an obvious, gradually decreasing distribution pattern from east to west. Factors such as technology push, market pull, and environmental regulation pull have positive but differentiated influences on the eco-innovation throughout China and among the eastern, central and western regions. Based on these heterogeneous influences and the targets of ecological civilization construction, promoting the Regional synergy of technology push, market pull, and environmental regulation pull is necessary to improve the level of eco-innovation in China.