Resolving the variability in habitat use by juvenile small pelagic fish in a major tidal system by continuous echosounder measurements

Marine Ecology Progress Series, Journal Year: 2023, Volume and Issue: 741, P. 169 - 187

Published: July 10, 2023

Shallow coastal areas are important nurseries for larvae and juveniles of many fish species. However, empirical data on small pelagic (SPF) in such regions lacking, temporal variability abundance habitat use by SPF unknown. Given the critical role as a trophic link, their commercial value sensitivity to climate variability, there is need quantitative high-resolution monitoring method. We deployed bottom-mounted echosounder, combined with water current profiler, examine variation density, vertical distribution movement behaviour Marsdiep, dynamic tidal inlet between North Sea Wadden Sea. The acoustic setup provided year-round records density column every 90 min. Monthly samples were collected help interpret observations. Our analyses indicated that Marsdiep migration gateway from into Sea, particularly juvenile herring sprat. observed clear seasonality high densities mid-spring early autumn. Fish typically used upper half column. Swimming was primarily driven currents. Yet, during outgoing tide, resisted outflowing current, suggesting efforts remain supporting hypothesis serves preferred nursery area SPF. frequency, multi-seasonal vertically resolved observations provide unique insight Furthermore, potential applications autonomous echosounder moorings discussed.

Language: Английский

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Epigenetic patterns in Atlantic herring (Clupea harengus): Temperature and photoperiod as environmental stressors during larval development

Molecular Ecology, Journal Year: 2023, Volume and Issue: 33(1)

Published: Nov. 1, 2023

Abstract Understanding the molecular mechanisms underlying individual responses to environmental changes is crucial for species conservation and management. Pelagic fishes including Atlantic herring ( Clupea harengus ) are of particular interest because their key ecological economic roles susceptibility a changing ocean from global warming. Temperature photoperiod have been linked with spawning time location in adult herring, but no study has thus far investigated role factors on gene regulation during vulnerable early developmental stages. Here, we examine DNA methylation patterns larval bred under two temperatures (11°C 13°C) (6 12 h) regimes 2 × factorial design. We found consistently high levels across all individuals decline increased stage that was more pronounced at 13°C p ≤ 0.007) than 11°C ≥ 0.21). Most differentially methylated sites were exon promoter regions genes metabolism development, some which hypermethylated higher temperature. These results demonstrate important development suggest this mechanism might be regulating early‐stage stressors herring.

Language: Английский

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Effects of incubation temperature and maternal phenotype on Baltic herring (Clupea harengus membras) eggs and larvae: an experimental study

Canadian Journal of Fisheries and Aquatic Sciences, Journal Year: 2024, Volume and Issue: 81(8), P. 1052 - 1065

Published: Aug. 1, 2024

Temperature modifies the reproductive success of fish, yet, in many species, we lack information on its role early development. In this study, effect temperature relation between maternal traits (length, age, somatic condition, and muscle lipid ovarian thyroid hormone concentrations), egg quality (fertilization success, development rate, mortality, hatching success), offspring (size-at-hatch, yolk sac size, proportion malformations) were studied Baltic herring ( Clupea harengus membras) northern Sea. The experiments conducted at an ambient 7 °C elevated 14 using 5 to 10 females 3 replicates per female. results indicate that may result a faster developmental lower early-stage mortality smaller size-at-hatch, larger higher amount larval malformations when compared temperature. also associated with traits, indicating especially hormones play mediating physiological processes.

Language: Английский

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The combined effects of acidification and acute warming on the embryos of Pacific herring (Clupea pallasii)

Frontiers in Marine Science, Journal Year: 2023, Volume and Issue: 10

Published: Dec. 18, 2023

Anthropogenic climate change is projected to affect marine ecosystems by challenging the environmental tolerance of individuals. Marine fishes may be particularly vulnerable emergent stressors during early life stages. Here we focus on embryos Pacific herring (Clupea pallasii ), an important forage fish species widely distributed across North Pacific. Embryos were reared under a range temperatures (10-16°C) crossed with two p CO 2 levels (600 and 2000 μatm ) investigate effects metabolism survival. We further tested how elevated affects critical thermal ( CT max short-term temperature fluctuations. Experiments repeated collected from winter spring spawning populations determine if phenology corresponds different limits in offspring. found that could withstand acute exposure 20°C regardless population or incubation treatment, but survival was greatly reduced after 2-3 hours at 25°C. had limited . The chronically warm conditions (12°, 14°, 16°C) significantly lower relative 10°C treatments both populations. Oxygen consumption rates (MO also higher levels. However, heart contraction measurements made 48 revealed greater increase rate compared 16°C, suggesting acclimation temperatures. Our results indicate are generally tolerant stress. Importantly, spring-spawning did not clearly exhibit heat stress

Language: Английский

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MAREL Carnot data and metadata from the Coriolis data center

Earth system science data, Journal Year: 2023, Volume and Issue: 15(9), P. 4205 - 4218

Published: Sept. 25, 2023

Abstract. The French coast of the eastern English Channel (ECC) is classified as a potential eutrophication zone by Oslo and Paris (OSPAR) Convention moderate to poor according phytoplankton quality element Water Framework Directive (WFD). It regularly affected Phaeocystis globosa bloom events, which have detrimental effects on marine ecosystem, economy, public health. In this context improve our observation strategy, MAREL Carnot, multi-sensor oceanographic station, was installed in 2004 at Carnot wall Boulogne-sur-Mer. aim station collect high-frequency measurements several water parameters complement conventional low-resolution monitoring programs. purpose paper describe dataset show how it can be used for research objectives. collects high-frequency, multi-parameter observations from surface well meteorological sends data near real-time an onshore center. paper, we present physical, chemical, biological measured station. We also demonstrate that assess environmental or ecological statuses conduct field ecology oceanography. addition, may indirectly aid improving European management strategies. publicly accessible via https://doi.org/10.17882/39754 (MAREL 2023).

Language: Английский

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