Article
Fisheries
Shuyang Ma, Caihong Fu, Jianchao Li, Peng Sun, Yang Liu, Zhenjiang Ye, Yoshiro Watanabe, Yongjun Tian
Summary: This study used variable coefficients generalized additive models to reveal the non-stationary effects of density dependence, fishing pressure, and climatic conditions on the population dynamics of Japanese sardine. The results indicated that the dynamics of Japanese sardine from 1976 to 2018 could be divided into four periods: the 1980s with high abundance sustained by suitable climatic conditions, the 1990s with population collapse due to negative density-dependent effects and degrading climatic conditions, the 2000s with restricted population increase caused by negative triple effects, particularly high fishing pressure, and the 2010s with population recovery facilitated by favorable climatic conditions and low fishing pressure.
FISH AND FISHERIES
(2023)
Article
Fisheries
Stefan Koenigstein, Michael G. Jacox, Mercedes Pozo Buil, Jerome Fiechter, Barbara A. Muhling, Stephanie Brodie, Peter T. Kuriyama, Toby D. Auth, Elliott L. Hazen, Steven J. Bograd, Desiree Tommasi
Summary: In this study, a data-driven population model was developed to predict the fluctuations of the US Pacific sardine population. The model revealed that the lack of sardine recovery after 2014 can be attributed to reduced food availability. Future climate projections suggest a likely recovery to early 2000s sardine abundance and catch by mid-century, due to increased recruitment.
ICES JOURNAL OF MARINE SCIENCE
(2022)
Article
Environmental Studies
Tim M. Ward, Barrett W. Wolfe, Gretchen L. Grammer, Alex R. Ivey, Edward King, Andreas Schiller, Karlie S. McDonald, Jeffrey M. Dambacher
Summary: This paper presents the discovery of a large sardine resource off South-eastern Australia. The researchers used data from ichthyoplankton surveys to estimate the daily egg production and spawning biomass of the sardine stock. The results suggest that the stock has the capacity to sustain a larger catch, indicating opportunities to increase Australia's fisheries production.
Article
Marine & Freshwater Biology
Jeremy J. Vaudo, Tyler S. Plum, Ryan K. Logan, Bradley M. Wetherbee, Mahmood S. Shivji
Summary: This study used drifting pelagic baited remote underwater video stations to describe the vertebrate diversity and variability in a highly productive pelagic ecosystem off Pacific Panama. The results showed that community composition varied spatiotemporally, with higher richness and abundance during the wet season and with increasing distance from shore/seafloor depth. The study highlights the importance of using non-invasive sampling techniques to fill knowledge gaps in data-limited species and regions.
Article
Environmental Sciences
Rebecca G. Asch, Joanna Sobolewska, Keo Chan
Summary: Species distribution models combined with earth system models are commonly used to predict changes in organismal occurrence, abundance, and phenology under climate change. However, an assumption of these models that the relationships between organisms and the environment are stationary has been found to be problematic. Patterns of distribution among larvae of four small pelagic fishes in the California Current were found to be non-stationary across different time periods and environmental conditions. This non-stationarity may hinder our ability to reliably project how species will respond to climatic change.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Marine
Hae-Young Choi, Sung Kim
Summary: This study observed hydroids consuming pelagic fish eggs and used COI metabarcoding to identify the predator and prey species. The predator was determined to be Ectopleura crocea, and the prey species were Sillago japonica and Parajulis poecilepterus. Additionally, four arthropod species were consumed.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Ecology
Brian Mahardja, Vanessa Tobias, Shruti Khanna, Lara Mitchell, Peggy Lehman, Ted Sommer, Larry Brown, Steve Culberson, J. Louise Conrad
Summary: The study found that pelagic fishes in the San Francisco Estuary consistently decline during droughts, but exhibit a considerable amount of resilience in the subsequent wet years; however, not all wet years result in full recovery, leading to permanently lower baseline numbers for some pelagic fishes. In contrast, littoral fishes seem to be more resistant to drought and may even increase in occurrence during dry years.
ECOLOGICAL APPLICATIONS
(2021)
Article
Environmental Sciences
Shouliang Huo, Chunzi Ma, Wenpan Li, Zhuoshi He, Hanxiao Zhang, Le Yu, Yong Liu, Xianghui Cao, Fengchang Wu
Summary: The increase in nutrient loadings in China's waterways over the past four decades has led to widespread eutrophication and water quality impairments. This study provides estimates of changes in riverine nutrient fluxes for China from 1980 to 2018 and reveals significant spatial, interannual, and long-term variations. The study emphasizes the important role of precipitation and temperature variability in controlling nutrient fluxes.
Article
Environmental Sciences
Zeshu Yu, Marty Kwok-Shing Wong, Jun Inoue, Sk Istiaque Ahmed, Tomihiko Higuchi, Susumu Hyodo, Sachihiko Itoh, Kosei Komatsu, Hiroaki Saito, Shin-ichi Ito
Summary: Using environmental DNA monitoring, we were able to reveal the spatial distribution patterns of small pelagic fishes in the Kuroshio Current system and hypothesize that predator-prey relationships influence their distribution in these fish communities.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Clara Lopes, Ana C. Ambrosino, Catia Figueiredo, Miguel Caetano, Miguel M. Santos, Susana Garrido, Joana Raimundo
Summary: This study analyzed the accumulation of microplastics in three species of coastal pelagic fish. Microplastics were found in the gastrointestinal tract, gills and muscle of all studied species. Horse mackerel had the highest concentrations of microplastics in the gastrointestinal tract, while anchovies and sardines had lower concentrations in their muscle tissue. The study provides important evidence of microplastic tissue distribution in small pelagic fish species and contributes to the understanding of the potential harmful effects of microplastic contamination.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Yuzhuo Liao, Xing Miao, Rui Wang, Ran Zhang, Hai Li, Longshan Lin
Summary: In this study, eDNA metabarcoding was used to analyze the fish biodiversity in the Cosmonaut Sea of East Antarctica. The results showed a higher fish biodiversity than previous studies and the eDNA composition of fish was related to environmental factors. The study demonstrated the potential of eDNA technique as a powerful tool for polar ecology research, especially in the context of climate change.
MARINE ENVIRONMENTAL RESEARCH
(2023)
Article
Marine & Freshwater Biology
Tohya Yasuda, Masanori Oda, Shuichi Tanaka, Nobuaki Nanjo, Motomitsu Takahashi, Masa-aki Fukuwaka
Summary: The study found that Japanese sardines preferentially retain specific long-chain polyunsaturated fatty acids (LC-PUFAs) in the muscles during feeding periods, with levels decreasing in the muscles and increasing in the ovaries during spawning periods.
Article
Fisheries
Alexandre Schickele, Eric Goberville, Boris Leroy, Gregory Beaugrand, Tarek Hattab, Patrice Francour, Virginie Raybaud
Summary: This study investigated the potential changes in the spatial distribution of seven of the most harvested small pelagic fish species in Europe under different climate change scenarios. The results showed that the environmental suitability for most species may decrease in the Mediterranean and western North Sea, while increasing in the Black and Baltic Seas. Under the most pessimistic scenario, climate-related local extinctions were expected in the south-eastern Mediterranean basin.
FISH AND FISHERIES
(2021)
Article
Environmental Sciences
Dylan K. Stompe, Peter B. Moyle, Kiva L. Oken, James A. Hobbs, John R. Durand
Summary: The San Francisco Estuary has undergone significant changes due to human activities, resulting in declines in native and introduced fish species. To track fish abundance, various monitoring programs have conducted fish surveys since the late 1950s. To compensate for survey limitations, researchers integrated data from multiple programs to model the distribution of pelagic fish species. Their modeling approach revealed spatially driven declines in striped bass, Delta smelt, longfin smelt, threadfin shad, and American shad in the estuary.
ESTUARIES AND COASTS
(2023)
Article
Environmental Sciences
Jerome Fiechter, Mercedes Pozo Buil, Michael G. Jacox, Michael A. Alexander, Kenneth A. Rose
Summary: The study predicts changes in sardine population dynamics and catch in the California Current system by coupling downscaled earth system models to fish and fishing fleet models. It shows that sardine biomass exhibits low-frequency variability over the 21st century, with a poleward shift driven by thermal habitat preference. The magnitude of poleward displacement varies noticeably under different warming conditions, impacting catch in different regions of the California Current system.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Fisheries
Sho Furuichi, Yohei Niino, Yasuhiro Kamimura, Ryuji Yukami
FISHERIES RESEARCH
(2020)
Article
Fisheries
Tohya Yasuda, Satoshi Kitajima, Akira Hayashi, Motomitsu Takahashi, Masa-aki Fukuwaka
Summary: The study revealed that Japanese sardine in the Sea of Japan have larger bodies and higher lipid contents in offshore habitats compared to coastal areas. Offshore zooplankton also showed significantly higher lipid contents than coastal zooplankton, which positively influenced the lipid content of sardines. This suggests that offshore habitats may provide a more favorable environment for sardines in terms of lipid availability.
FISHERIES OCEANOGRAPHY
(2021)
Article
Forestry
Kei K. Suzuki, Yasufumi Watanabe, Takuya Kubota, Yasumitsu Kuwano, Yohei Kawauchi, Hiromi Yamagawa, Masatoshi Yasuda, Hiroshi Kondoh, Haruto Nomiya, Teruki Oka
Summary: The study used a generalized additive model to analyze sporadic data and reveal large-scale spatial variation in deer browsing damage. Browsing damage increased with plantation age, with stands aged 2+ years showing more damage. Areas of high browsing damage generally coincided with areas of high deer abundance.
IFOREST-BIOGEOSCIENCES AND FORESTRY
(2021)
Article
Marine & Freshwater Biology
Sho Furuichi, Yasuhiro Kamimura, Ryuji Yukami
Summary: The study estimated length-length and length-weight relationships for dominant small pelagic fishes in the Kuroshio-Oyashio current system, providing comprehensive information for biological studies and stock assessments of these fish species.
Article
Marine & Freshwater Biology
Tohya Yasuda, Masanori Oda, Shuichi Tanaka, Nobuaki Nanjo, Motomitsu Takahashi, Masa-aki Fukuwaka
Summary: The study found that Japanese sardines preferentially retain specific long-chain polyunsaturated fatty acids (LC-PUFAs) in the muscles during feeding periods, with levels decreasing in the muscles and increasing in the ovaries during spawning periods.
Article
Forestry
Kei K. Suzuki, Teruki Oka, Masatoshi Yasuda
Summary: The study on the spatiotemporal distribution of the antlerless ratio in culled sika deer revealed that the ratio increases asymptotically as deer density rises, supporting the hypothesis. These findings should help to increase the efficiency of managing the deer via antlerless-biased culling.
JOURNAL OF FORESTRY RESEARCH
(2022)
Article
Ecology
Kei K. Suzuki, Masatoshi Yasuda, Miwa Sonoda
Summary: This study verifies the effect of selective culling on reducing browsing damage by considering spatial changes, and finds that the benefits of selective culling extend to the spatial scale of culling.
JOURNAL OF WILDLIFE MANAGEMENT
(2022)
Article
Forestry
Kei K. Suzuki, Yasumitsu Kuwano, Yuki Kanamori, Yohei Kawauchi, Yoshihiko Uchimura, Masatoshi Yasuda, Hiroshi Kondoh, Teruki Oka
Summary: The authors investigated the density distribution and population dynamics of a managed population of sika deer on Kyushu Island, Japan, and found no decreasing trend in the population despite efforts to reduce it. The possible explanation is that the initial estimation of the population was underestimated. This study emphasizes the difficulties of wide-area management of sika deer and highlights three important factors for successful management.
Article
Fisheries
Ray Hilborn, Claudio C. Buratti, Erich Diaz Acuna, Daniel Hively, Jeppe Kolding, Hiroyuki Kurota, Nicole Baker, Pamela M. Mace, Carryn L. de Moor, Soyoka Muko, Giacomo Chato Osio, Ana M. Parma, Juan-Carlos Quiroz, Michael C. Melnychuk
Summary: This paper provides an overview of trends in abundance and fishing pressure on small pelagic fish stocks from single-species scientific assessments. It shows that while individual stocks have exhibited variability in abundance, there has been stability in average fishing pressure and biomass since 1970. The Mediterranean and Black Sea are of greatest concern for high and growing fishing pressure.
FISH AND FISHERIES
(2022)
Article
Multidisciplinary Sciences
Sho Furuichi, Yasuhiro Kamimura, Masahiro Suzuki, Ryuji Yukami
Summary: Schooling behavior of small pelagic fishes is density-dependent, with different species exhibiting different responses to changes in population density. Our findings provide insights into how biological interactions mediate the density-dependent processes underlying population dynamics and community structure of small pelagic fishes in marine ecosystems.
Article
Biology
Kei K. Suzuki, Yasumitsu Kuwano, Masatoshi Yasuda
Summary: The study evaluated the effectiveness of antlerless culling on sika deer population dynamics. It found that deer populations decreased in areas with higher antlerless culling and increased in areas with lower antlerless culling. This suggests that a high proportion of antlerless culling can effectively decrease the deer population. The study highlights the importance of antlerless-biased culling in managing overabundant populations of herbivores.
Article
Forestry
Hiromi Yamagawa, Fumiaki Kitahara, Tatsuya Otani, Reiji Yoneda, Kei K. Suzuki, Haruto Nomiya
Summary: This study examined a method for assessing the level of deer damage in young Sugi plantations with deer-proof fences. Multiple correspondence analysis and logistic regression analysis showed that the deer impact score (DISco) was an effective tool for evaluating the damage risk of deer in these plantations.
JOURNAL OF FOREST RESEARCH
(2023)
Article
Zoology
Kei K. Suzuki, Taiki Mori, Hiromi Yamagawa
Summary: This study identified a method to attract female deer based on sex differences in mineral requirements, with the aim of facilitating female culling. The use of salt water as an attractant was found to be effective, as female deer clearly preferred salt water over regular water. This approach could be beneficial for female-biased culling in various herbivores.
Article
Agriculture, Dairy & Animal Science
Taiki Mori, Sho Iwagami, Hiromi Yamagawa, Kei K. Suzuki
Summary: Selective culling of female sika deer is effective in reducing overabundant populations, and sodium and calcium can act as attractants for this purpose. Our analysis showed that sufficient sodium and calcium are not always provided by feed plants, especially when intake is low and deer are large. Sodium deficiency is more intense for lactating females, while calcium deficiency is more intense for males. The findings suggest that sodium and calcium could be useful for developing effective culling methods, particularly for selective culling of lactating female sika deer.