Disentangling seasonal from maternal effects on egg characteristics in western Baltic spring‐spawning herring Clupea harengus

Journal of Fish Biology, Journal Year: 2022, Volume and Issue: 101(6), P. 1428 - 1440

Published: Sept. 6, 2022

In marine fishes, the timing of spawning determines environment offspring will face and, therefore, chances early life stage survival. Different waves Atlantic herring Clupea harengus spawn throughout spring in western Baltic Sea, and survival from season has been low most recent decade. The authors assessed changes egg traits early, middle late phases to examine whether seasonal and/or maternal effects influenced embryo At each phase, fertilized eggs six eight females were incubated at two temperatures (7 13°C), size, fertilization success, mortality time hatch recorded. A compilation data 2017 2020 seasons indicated that mean total length decreased with progression increasing situ water temperature. For sub-set used laboratory study, spawners 7.6% larger produced 14.2% than late-spring spawners. Fertilization success was consistently high (>90%), (<3%). Neither former nor latter by season, but both maternity. This significant female effect was, however, not related any trait measured here (total length, Fulton's condition factor or age). There no on development rate 7 13°C. results suggest intrinsic differences among are unlikely markedly contribute poor observed for progeny this population point towards other extrinsic factors processes acting larval stages (e.g., match-mismatch dynamics prey) as more likely causes mortality.

Language: Английский

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Sperm adaptation in relation to salinity in three goby species

Journal of Fish Biology, Journal Year: 2021, Volume and Issue: 99(2), P. 607 - 613

Published: April 21, 2021

Abstract In externally fertilizing species, the gametes of both males and females are exposed to influences environment into which they released. Sperm sensitive abiotic factors such as salinity, but also affected by biotic sperm competition. this study, authors compared performance three goby painted goby, Pomatoschistus pictus , two‐spotted flavescens sand minutus . These species differ in their distributions, with having narrowest salinity range widest. Moreover, data from paternity show that experiences least competition, whereas competition is ubiquitous. The took samples dissected them high water (31 PSU) representing North Sea low (6 brackish Baltic Proper. They then used computer‐assisted analysis measure proportion motile swimming speed 10 min 20 h after activation. found depended on there seemed be no relationship species' geographical distribution relation range. differed sperm, was significant decrease motility during h. only 72

Language: Английский

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Speciation genomics and the role of depth in the divergence of rockfishes (Sebastes) revealed through Pool‐seq analysis of enriched sequences

Ecology and Evolution, Journal Year: 2022, Volume and Issue: 12(9)

Published: Sept. 1, 2022

Speciation in the marine environment is challenged by wide geographic distribution of many taxa and potential for high rates gene flow through larval dispersal mechanisms. Depth has recently been proposed as a driver ecological divergence fishes, yet it unclear how adaptation along these gradients' shapes genomic divergence. The genus

Language: Английский

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Allopatric origin, secondary contact and subsequent isolation of sympatric rockfishes (Sebastidae: Sebastes) in the north-western Pacific

Biological Journal of the Linnean Society, Journal Year: 2022, Volume and Issue: 138(1), P. 37 - 50

Published: Oct. 20, 2022

Abstract Understanding how speciation occurs is central to biology. Gene flow between diverging taxa correlated with geography and other aspects of speciation; therefore, the examination gene during divergence a potent approach understanding nature speciation. Here, we inferred process sympatric rockfishes Sebastes steindachneri wakiyai in north-western Pacific its marginal seas based on genome-wide single nucleotide polymorphism mitochondrial DNA data. Model-based demographic inference showed that two species was absent initial late stages present only middle stage. Population expansion occurred before or period flow. The estimated timings population fell within Pleistocene, which currently inhabited by were repeatedly isolated reconnected. Contemporary isolation supported absence hybrids shared haplotypes. Our results suggest initially diverged allopatry, followed secondary contact introgression completion reproductive isolation. Given complete following has rarely been tested documented marine organisms, highlight importance careful consideration alternative scenarios be tested, should take into account geological environmental settings.

Language: Английский

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A decade of progress in marine evolutionary biology

Evolutionary Applications, Journal Year: 2022, Volume and Issue: 16(2), P. 193 - 201

Published: Dec. 25, 2022

Abstract This article summarizes the Evolutionary Applications Special Issue, “A decade of progress in Marine Biology.” The globally connected ocean, from its pelagic depths to highly varied coastlines, inspired Charles Darwin develop theory evolution during voyage Beagle. As technology has developed, there been a dramatic increase our knowledge about life on blue planet. composed 19 original papers and seven reviews, represents small contribution larger picture recent research evolutionary biology, how such advancements come through connection researchers, their fields, knowledge. first European network for marine Linnaeus Centre Biology (CeMEB), was developed study processes environment under global change. Though hosted by University Gothenburg Sweden, quickly grew encompass researchers throughout Europe beyond. Today, more than after foundation, CeMEB's focus consequences change is relevant ever, gained urgently needed management conservation. organized CeMEB network, contains contributions all over world provides snapshot current state field, thus forming an important basis future directions.

Language: Английский

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