Evidence of prezygotic isolation, but not assortative mating, between locally adapted populations ofFundulus heteroclitusacross a salinity gradient DOI Creative Commons
Reid S. Brennan, Andrew Whitehead

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2022, Volume and Issue: unknown

Published: Sept. 5, 2022

Abstract Selection along environmental gradients can drive reproductive isolation and speciation. Among fishes, salinity is a major factor limiting species distributions and, despite its importance in generating diversity, transitions between marine freshwater are rare. Here, we tested for mechanisms of locally adapted brackish water-native populations killifish, Fundulus heteroclitus , from either side hybrid zone gradient. There was evidence pre-zygotic endogenous with reduced fertilization success crosses freshwater-native males females. Exogenous also present where females had highest their native salinity. We used replicated mass spawning design to test mate choice both fresh water. After genotyping 187 parents 2,523 offspring at 2,347 SNPs across the genome, 85% were successfully assign parents. However, no reinforcing observed. These results therefore demonstrate emerging, yet limited, incipient speciation gradient suggest that exogenous mechanisms, but not assortative mating, contribute divergence.

Language: Английский

Molecular, behavioural and morphological comparisons of sperm adaptations in a fish with alternative reproductive tactics DOI Creative Commons
Charlotta Kvarnemo, León Green, Ola Svensson

et al.

Evolutionary Applications, Journal Year: 2022, Volume and Issue: 16(2), P. 338 - 353

Published: June 21, 2022

In species with alternative reproductive tactics, there is much empirical support that parasitically spawning males have larger testes and greater sperm numbers as an evolved response to a higher degree of competition, but for performance (motility, longevity speed) by such inconsistent. We used the sand goby (Pomatoschistus minutus) test whether differed between breeding-coloured (small testes, large mucus-filled sperm-duct glands; build nests lined sperm-containing mucus, provide care) parasitic sneaker-morph (no breeding colouration, rudimentary no nest, care). compared motility (per cent motile sperm), velocity, sperm, gene expression morphometrics two morphs. also tested if gland contents affected performance. found clear difference in male morphs 109 transcripts differentially expressed Notably, several mucin genes were upregulated ATP-related males. There was partial evidence velocity males, motility. Presence significantly increased nonsignificantly tended increase motility, equally so The has remarkably long-lived only small or decline over time (5 min vs. 22 h), again, this true both Sperm length (head, flagella, total flagella-to-head ratio) did not differ correlate either morph. Thus, other than expression, we modest differences morphs, confirming previous findings adaptation competition primary target evolution.

Language: Английский

Citations

6
Ten years of marine evolutionary biology—Challenges and achievements of a multidisciplinary research initiative DOI Creative Commons
Kerstin Johannesson, Erica H. Leder, Carl André

et al.

Evolutionary Applications, Journal Year: 2022, Volume and Issue: 16(2), P. 530 - 541

Published: April 26, 2022

Abstract The Centre for Marine Evolutionary Biology (CeMEB) at the University of Gothenburg, Sweden, was established in 2008 through a 10‐year research grant 8.7 m€ to team senior researchers. Today, CeMEB members have contributed >500 scientific publications, 30 PhD theses and organised 75 meetings courses, including 18 three‐day four conferences. What are footprints CeMEB, how will centre continue play national international role as an important node marine evolutionary research? In this perspective article, we first look back over 10 years activities briefly survey some many achievements CeMEB. We furthermore compare initial goals, formulated application, with what has been achieved, discuss challenges milestones along way. Finally, bring forward general lessons that can be learnt from funding type, also ahead, discussing CeMEB’s used springboard future biology.

Language: Английский

Citations

6
Reproductive dysfunction in seawater provides an environmental barrier to the range expansion of the invasive Neogobius melanostomus into the North Sea DOI Creative Commons
León Green, Martina Griful‐Dones, Charlotta Kvarnemo

et al.

Biological Invasions, Journal Year: 2024, Volume and Issue: 26(12), P. 4301 - 4315

Published: Sept. 23, 2024

Abstract Salinity can shape species’ distributions via physiological costs. Understanding how and when these costs occur help predict colonisation patterns, for example during species invasions. To understand the impacts of high salinity environments on ongoing expansion invasive round goby ( Neogobius melanostomus ) towards North Sea, fish from this invasion front were spawned in a common-garden setup at different salinities. Reproductive adults acclimated to control (20 PSU) representing current conditions, Sea coastal (30 PSU). In salinities they sorted into spawning groups, attempts egg development was tracked 1.5 months. The results showed strong impact 30 PSU treatment, with complete developmental failure all clutches salinity. failed resulted significant increase consumption by nest-guarding males. addition, sperm velocity decrease increasing tested both an intermediate level. Few differences adult physiology found as consequence treatments. These show that, despite acclimation gametes N. cannot now cope which their spread is currently predicted. Though adaptation or transgenerational might allow reproduction higher than occupy, we suggest models incorporate reproductive limit PSU.

Language: Английский

Citations

0
Impact of salinity and body size on sperm motility in three California smelt species DOI Creative Commons
Md. Moshiur Rahman, Tien‐Chieh Hung

Aquaculture Reports, Journal Year: 2024, Volume and Issue: 39, P. 102503 - 102503

Published: Nov. 16, 2024

Language: Английский

Citations

0
Evidence of prezygotic isolation, but not assortative mating, between locally adapted populations ofFundulus heteroclitusacross a salinity gradient DOI Creative Commons
Reid S. Brennan, Andrew Whitehead

Journal of Evolutionary Biology, Journal Year: 2023, Volume and Issue: 36(4), P. 687 - 697

Published: Feb. 28, 2023

Abstract Selection along environmental gradients can drive reproductive isolation and speciation. Among fishes, salinity is a major factor limiting species distributions, despite its importance in generating diversity, speciation events between marine freshwater are rare. Here, we tested for mechanisms of locally adapted brackish water‐native populations killifish, Fundulus heteroclitus , from either side hybrid zone gradient. There was evidence pre‐zygotic endogenous with reduced fertilization success crosses freshwater‐native males females. Exogenous also present where females had highest their native salinity. We used replicated mass spawning design to test mate choice both fresh water. After genotyping 187 parents 2523 offspring at 2347 SNPs across the genome, 85% were successfully assign parents. However, no reinforcing observed. These results therefore demonstrate emerging, yet limited, incipient gradient suggest that exogenous mechanisms, but not assortative mating, contribute divergence.

Language: Английский

Citations

0
Evidence of prezygotic isolation, but not assortative mating, between locally adapted populations ofFundulus heteroclitusacross a salinity gradient DOI Creative Commons
Reid S. Brennan, Andrew Whitehead

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2022, Volume and Issue: unknown

Published: Sept. 5, 2022

Abstract Selection along environmental gradients can drive reproductive isolation and speciation. Among fishes, salinity is a major factor limiting species distributions and, despite its importance in generating diversity, transitions between marine freshwater are rare. Here, we tested for mechanisms of locally adapted brackish water-native populations killifish, Fundulus heteroclitus , from either side hybrid zone gradient. There was evidence pre-zygotic endogenous with reduced fertilization success crosses freshwater-native males females. Exogenous also present where females had highest their native salinity. We used replicated mass spawning design to test mate choice both fresh water. After genotyping 187 parents 2,523 offspring at 2,347 SNPs across the genome, 85% were successfully assign parents. However, no reinforcing observed. These results therefore demonstrate emerging, yet limited, incipient speciation gradient suggest that exogenous mechanisms, but not assortative mating, contribute divergence.

Language: Английский

Citations

0