Stock Assessment of the Commercial Small Pelagic Fishes in the Beibu Gulf, the South China Sea, 2006–2020

Biology, Journal Year: 2024, Volume and Issue: 13(4), P. 226 - 226

Published: March 29, 2024

Long-term variations in population structure, growth, mortality, exploitation rate, and recruitment pattern of two major commercial small pelagic fishes (CSPFs) (Decapterus maruadsi Trachurus japonicus) are reported based on bottom trawl survey data collected during 2006–2020 the Beibu Gulf, South China Sea. All individuals each sampling quarter over a period 15 years were subjected to laboratory-based analysis. In this study, stock D. T. japonicus inhabiting Gulf was assessed using length-based methods (bootstrapped electronic length frequency analysis (ELEFAN)) complete assessment different fishery management periods (the division fisheries China’s input output Sea offshore years, specifically divided into I (2006–2010), II (2011–2015), III (2016–2020)). The results showed that mean body length, dominant size, estimated asymptotic CSPFs decreased, whereas their growth coefficient indicating miniaturization slower respectively. Estimated rates catching for indicated both stocks overexploited moderately exploited after 2011. These taking good turn status III, with rate much lower than initial reversing downward trend length. Furthermore, spawning season CSPF barely satisfactory expected yield complexity current Gulf. suggest measures reduce fishing pressure may have positive influence biological characteristics those Gulf; however, structure already affected by overfishing will be huge challenge conservation restoration resources future. Given still low first-capture (Lc) high mortality (F) (compared F0.1), we identify need refine controlling efforts increasing catchable more consideration should given local resource management.

Language: Английский

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Marine heatwaves in the Gulf of Mexico 1983‒2021: Statistics, recent intensifications, and threats on coral reefs

Advances in Climate Change Research, Journal Year: 2023, Volume and Issue: 14(4), P. 560 - 572

Published: Aug. 1, 2023

There is the current lack of comprehensive understanding hotspots, frequency, duration, spatiotemporal trends, and physical drivers marine heatwaves (MHWs) within Gulf Mexico (GoM). Here, a series high-resolution satellite reanalysis products are used to examine their characteristics, possible geophysical triggers MHWs. Possible impacts MHW on coral reefs also discussed. Results reveal an increasing trend in intensities from 1983–2021, particularly after 2016. It identifies MHWs hotspots GoM, notably northern western shelves Loop Current. The study further documents intense event late 2020 early 2021 latitude range 17.5°–24°N, attributing its development oceanic processes such as anticyclonic eddies current-driven heat transport. occurrence this potentially increased thermal stress Campeche Tuxtlas Reef Systems. This research illuminates trends providing valuable insights for predicting effects climate change ecosystems.

Language: Английский

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Differential dissolution of biogenic silica significantly affects the utility of sediment diatoms as paleoceanographic proxies

Limnology and Oceanography, Journal Year: 2024, Volume and Issue: 69(3), P. 467 - 481

Published: Jan. 18, 2024

Abstract Diatoms and biogenic silica (biogenic Si) in sediments are commonly analyzed as paleoceanographic environmental indicators. However, the correspondence between these sedimentary components their counterparts water column above can vary over time space. This study, undertaken northern South China Sea, compares diatoms Si sinking particles from with those surface below. The results indicate substantial losses of during burial, along changes diatom assemblages. About 6% 1000 m depth estimated to be preserved sediments: 32% recycled 62% lost at sediment–water interface. Approximately, 12% is remineralized 82% differences preservation remineralization likely due dissolution resistance among various species other silicifiers (e.g., radiolarians), effects lateral transport. variability introduces uncertainties into inferences made two proxies sediments. Thalassionema nitzschioides was found dominate sediment assemblages, which we attribute its great dissolution, negatively correlated fluxes. These properties suggest that T. may potentially useful an indicator low paleoproductivity seen strong El Niño events).

Language: Английский

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Proteomics analysis reveals differential acclimation of coastal and oceanic Synechococcus to climate warming and iron limitation

Frontiers in Microbiology, Journal Year: 2024, Volume and Issue: 15

Published: Feb. 20, 2024

In many oceanic regions, anthropogenic warming will coincide with iron (Fe) limitation. Interactive effects between and Fe limitation on phytoplankton physiology biochemical function are likely, as temperature availability affect of the same essential cellular pathways. However, we lack a clear understanding how globally significant such picocyanobacteria Synechococcus respond to these co-occurring stressors, what underlying molecular mechanisms drive this response. Moreover, ecotype-specific adaptations can lead nuanced differences in responses strains. study, isolates YX04-1 (oceanic) XM-24 (coastal) from South China Sea were acclimated at two temperatures, their physiological proteomic compared. Both strains exhibited reduced growth due coastal maintained relatively higher rates response under replete Fe, while its was notably more compromised both temperatures compared YX04-1. concurrent heat stress, better able adjust photosynthetic proteins minimize generation reactive oxygen species reducing proteome demand. Its intricate likely enabled mitigate some negative impact during Our study highlights ecologically-shaped even proximate regions differing climate stressors.

Language: Английский

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Diverse marine heatwave intensity trends in the marginal seas of China

Theoretical and Applied Climatology, Journal Year: 2024, Volume and Issue: 155(6), P. 5237 - 5250

Published: April 3, 2024

Language: Английский

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