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

Correlated divergence of female and male genitalia in replicated lineages with ongoing ecological speciation DOI
Ryan Greenway,

Rachel McNemee,

Alexander S. Okamoto

et al.

Evolution, Journal Year: 2019, Volume and Issue: 73(6), P. 1200 - 1212

Published: April 16, 2019

Divergence of genital traits among lineages has the potential to serve as a reproductive isolating barrier when copulation, insemination, and fertilization are inhibited by incompatibilities between female male genitalia. Despite widespread evidence for trait diversity closely related coevolution genitalia within lineages, few studies have investigated evolution during early stages speciation. We quantified variation in replicated population pairs Poecilia mexicana with ongoing ecological speciation sulfidic (H2 S containing) nearby nonsulfidic habitats. These analyses revealed rapid correlated divergence across evolutionarily independent exposed divergent selection regimes. Both sexes exhibited convergent populations inhabiting similar habitat types. Our results demonstrate that can occur speciation-with-gene-flow, potentially result intensity sexual conflict populations. suggest may contribute challenge generality previously suggested mechanisms poeciliids.

Language: Английский

Citations

4
A test for plasticity in sperm motility activation in response to osmotic environment in an anuran amphibian DOI Creative Commons
Phillip G. Byrne, Zara M. Anastas, Aimee J. Silla

et al.

Ecology and Evolution, Journal Year: 2022, Volume and Issue: 12(10)

Published: Oct. 1, 2022

Abstract Evolutionary theory predicts that selection will favor phenotypic plasticity in sperm traits maximize fertilization success dynamic environments. In species with external fertilization, osmolality of the medium is known to play a critical role activating motility, but evidence for osmotic‐induced limited euryhaline fish and marine invertebrates. Whether this capacity extends freshwater taxa remains unknown. Here, we provide first test sperm‐motility activation response osmotic environment an anuran amphibian. Male common eastern froglets ( Crinia signifera ) were acclimated either low (0 mOsmol kg −1 or high (50 environmental osmolality, using split‐sample experimental design, activated across range treatments (0, 25, 50, 75, 100, 200 ± 2 ). Unexpectedly, there was no detectable shift optimal after approximately 13 weeks acclimation (a period reflecting duration winter breeding season). However, both treatments, mirrored at natural site, indicating match local environment. Previously it has been shown C. display among‐population covariation between performance. Coupled finding, results present study suggest inter‐population differences reflect genetic divergence adaptation. We discuss need tests more better understand evolutionary contexts favoring adaptive activation.

Language: Английский

Citations

3
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
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