Review
Oceanography
Megumi Enomoto, Shin-ichi Ito, Motomitsu Takahashi, Chiyuki Sassa, Tomihiko Higuchi, Kotaro Shirai
Summary: This study analyzed the vertical habitat shift of juvenile Japanese jack mackerel using oxygen stable isotope analysis, and determined the timing and duration of the shift. The results showed that the fish's body length and growth conditions influence the timing of the habitat shift.
PROGRESS IN OCEANOGRAPHY
(2022)
Article
Ecology
Toshiaki S. Jo
Summary: Understanding the degradation processes of environmental DNA (eDNA) is crucial for accurately assessing species distribution and abundance in marine environments. Biphasic degradation, consisting of initial rapid decay and subsequent slower decay, may provide a more precise description of eDNA fate. However, the factors influencing eDNA decay rates at each phase remain unclear.
JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
(2023)
Article
Fisheries
Daisuke Hashida, Takeshi Tomiyama
Summary: In this study, the hatch date and larval growth rate of juvenile Japanese jack mackerel were examined in the Uwa Sea, Japan. It was found that the hatch date ranged from February to April, and the age at the onset of metamorphosis was 25.5-30.5 days. The larval growth rate was 0.30-0.34 mm/day. Significant negative correlations were observed between age at metamorphosis and juvenile abundance. The hatch date and larval growth rate were similar to those of Japanese jack mackerel juveniles from the East China Sea, suggesting that most of the juveniles originated from other waters.
JOURNAL OF FISH BIOLOGY
(2023)
Article
Fisheries
Motomitsu Takahashi, Chiyuki Sassa, Satoshi Kitajima, Mari Yoda, Youichi Tsukamoto
Summary: The study revealed that the growth traits of juvenile Japanese jack mackerel in the southwestern part of the Sea of Japan are influenced by thermal conditions, with slower growth rate in the eastern area due to lower temperatures compared to the western area. Furthermore, the thermal conditions have a significant impact on the abundance of juvenile mackerel.
FISHERIES OCEANOGRAPHY
(2022)
Article
Fisheries
Kazuo Ishikawa, Chikako Watanabe, Takahiko Kameda, Tsutomu Tokeshi, Hikari Horie, Daisuke Hashida, Toshiyuki Ookawa, Takashi Takeda, Masahiro Kuno, Yuki Suzuki, Shozo Takamura, Ryousuke Fukumoto, Sachihiko Itoh
Summary: The population structure of the Japanese jack mackerel Trachurus japonicus in coastal areas adjacent to the Kuroshio Current is influenced by the connectivity between spawning and juvenile/adult habitat areas. Analysis of size composition and commercial landing data reveals that different spawning grounds impact the landing of juvenile fish in different seasons, helping to sustain the population levels of the species.
FISHERIES OCEANOGRAPHY
(2021)
Article
Fisheries
Soyoka Muko, Mari Yoda, Hiroyuki Kurota, Seiji Ohshimo
Summary: To evaluate the potential spatial distribution and estimate the annual trends in abundance index, we developed spatio-temporal models for catch per unit effort (CPUE) of large- and medium-sized purse seine fisheries. The models incorporated various variables including year, month, vessel size, vessel identity, latitude and longitude points, and water temperature. The results indicated that the potential distribution areas for Japanese jack mackerel were mainly found on the continental shelf in the southern part of the East China Sea, the western side of Kyushu Island, and along Honshu Island in the western part of the Sea of Japan.
FISHERIES RESEARCH
(2023)
Article
Geriatrics & Gerontology
Shohei Okamoto, Erika Kobayashi, Hiroshi Murayama, Jersey Liang, Taro Fukaya, Shoji Shinkai
Summary: This empirical study found that differences in cognitive functioning and decline between men and women can be attributed to various individual attributes, such as education and occupation. Men seem to engage in activities that enhance cognitive functioning more than women, supporting the cognitive reserve hypothesis.
Article
Environmental Sciences
Wei Du, Weigang Wang, Ranran Liu, Yuying Wang, Yingjie Zhang, Jian Zhao, Lubna Dada, Conghui Xie, Qingqing Wang, Weiqi Xu, Wei Zhou, Fang Zhang, Zhanqing Li, Pingqing Fu, Jie Li, Juha Kangasluoma, Zifa Wang, Maofa Ge, Markku Kulmala, Yele Sun
Summary: The research on particle number size distribution is important for understanding pollution in cities. This study in Beijing found significant vertical differences of particle concentrations between ground level and higher altitudes, influenced by boundary dynamics and meteorological conditions. The study also identified six sources of PNSD, with local emissions dominantly contributing to smaller particles in the city. Overall, the results highlight the complex vertical evolution of PNSD due to various factors in megacities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Plant Sciences
Theekshana C. Jayalath, Marc W. van Iersel
Summary: Vertical farming is popular due to high yields, but energy cost for lighting is high. Mizuna showed greater dry weight, projected canopy size, and light use efficiency compared to lettuce, leading to faster growth. Understanding crop growth determinants is important for efficient vertical farming.
Article
Engineering, Chemical
Xiaobin Zhan, Lei Yu, Qiankun Jiang, Tielin Shi
Summary: This study analyzes the flow pattern and power consumption of mixing highly viscous fluids under vertical acoustic vibration, and investigates the effects of various process parameters on them. It is found that increasing the frequency or amplitude of vibration can expedite the mixing process, leading to improved mixing uniformity and significantly enhancing the effective mixing power. However, the energy absorbed by the fluids is highly nonlinear with respect to the frequency or amplitude of vibration.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Fisheries
Chiyuki Sassa, Satoshi Kitajima, Motomitsu Takahashi
Summary: The study found that the difference in juvenile instantaneous growth rate (IGR) between different years cannot be fully explained by variations in diet composition. Instead, habitat temperature was identified as the dominant factor causing the observed between-year differences in IGR in the southwestern Sea of Japan.
FISHERIES OCEANOGRAPHY
(2021)
Article
Environmental Sciences
Wenquan Wang, Fengjun Zhao, Yanxia Wang, Xiaoyuan Huang, Jiangxia Ye
Summary: Wildfires have a direct impact on global ecosystem stability and pose a severe threat to human life. The mountainous areas of South-west China frequently experience wildfires. This study uses Yunnan Province in China as a case study to map and analyze the drivers of wildfires, focusing on the seasonal dimensions for more dynamic results. The Maxent and random forest models were used to model wildfire susceptibility in different seasons and to evaluate the spatial relationships and marginal effects of potential drivers. The findings highlight the importance of understanding interseasonal variability and developing specific seasonal wildfire management strategies.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Multidisciplinary
Mohamad Hafizal Mad Zahir, Khairul Mustaqim Abdul Aziz, Ahmad Riza Ghazali, Abdul Halim Abdul Latiff
Summary: The evolution of fiber optic technology has brought significant advancements in fields like communication, data transport, imaging, and sensing. However, there have been few studies on using fiber optic sensors in geophysics. Distributed Acoustic Sensing (DAS) is a widely used method for subsurface imaging and monitoring, and this study evaluates four different strategies for deploying fiber optic cables in DAS Vertical Seismic Profiling (VSP). The results show that cementing the fiber behind casing is the most effective method, but other methods also have their advantages and limitations.
APPLIED SCIENCES-BASEL
(2023)
Article
Multidisciplinary Sciences
Min Su, Lingjun Du, Muhammad Yasir Ali, Jianing Yu, Mengyu Chi, Ziwen Teng, Yinjun Fan, Xiumei Tan, Hongxu Zhou
Summary: Aphelinus mali in China consists of two clades, the Shandong and Liaoning clades. By comparing morphological characteristics and mitochondrial genomes, and conducting hybridization experiments, the genetic relationship between these clades was clarified. The results showed that there were differences in size and mitochondrial genome length between the two clades. However, there was no reproductive isolation between them, indicating they belong to the same species.
Article
Agriculture, Multidisciplinary
Mari Yoda, Syuuichi Tanaka, Motomitsu Takahashi
Summary: The growth and reproductive cycle of jack mackerel in the southwestern Sea of Japan were studied using otolith annuli and gonad histology. The von Bertalanffy growth curve was determined and the spawning period was evaluated. This research provides valuable information for the sustainable management of jack mackerel in the Sea of Japan.
JARQ-JAPAN AGRICULTURAL RESEARCH QUARTERLY
(2023)