Gonadal traits and nutrient compositions of novel sea urchin hybrids of Hemicentrotus pulcherrimus (♀) and Strongylocentrotus intermedius (♂)

Liu, Li; Sun, Jiangtao; Zhan, Yaoyao; Zhao, Tanjun; Zou, Yang; Yan, Hanyu; Zhang, Weijie; Chang, Yaqing

doi:10.1016/j.aqrep.2020.100439

Cited by 7 publications

(10 citation statements)

References 17 publications

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“…Although the reciprocal cross produces viable offspring, hybrid larval survival, metamorphosis rates, and juvenile survival are significantly lower than conspecific controls. Furthermore, the surviving juveniles produce very few or no mature gamete cells, a pattern also observed in the Hemicentrotus pulcherrimus ♀ × S. intermedius ♂ cross (Liu et al, 2020 ).…”

Section: Discussionmentioning

confidence: 66%

Extensive introgression among strongylocentrotid sea urchins revealed by phylogenomics

Glasenapp,

Pogson

2023

Ecology and Evolution

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Gametic isolation is thought to play an important role in the evolution of reproductive isolation in broadcast‐spawning marine invertebrates. However, it is unclear whether gametic isolation commonly evolves early in the speciation process or only accumulates after other reproductive barriers are already in place. It is also unknown whether gametic isolation is an effective barrier to introgression following speciation. Here, we used whole‐genome sequencing data and multiple complementary phylogenomic approaches to test whether the well‐documented gametic incompatibilities among the strongylocentrotid sea urchins have limited introgression. We quantified phylogenetic discordance, inferred reticulate phylogenetic networks, and applied the Δ statistic using gene tree topologies reconstructed from multiple sequence alignments of protein‐coding single‐copy orthologs. In addition, we conducted ABBA–BABA tests on genome‐wide single nucleotide variants and reconstructed a phylogeny of mitochondrial genomes. Our results revealed strong mito‐nuclear discordance and considerable nonrandom gene tree discordance that cannot be explained by incomplete lineage sorting alone. Eight of the nine species examined demonstrated a history of introgression with at least one other species or ancestral lineage, indicating that introgression was common during the diversification of the strongylocentrotid urchins. There was strong support for introgression between four extant species pairs (Strongylocentrotus pallidus ⇔ S. droebachiensis, S. intermedius ⇔ S. pallidus, S. purpuratus ⇔ S. fragilis, and Mesocentrotus franciscanus ⇔ Pseudocentrotus depressus) and additional evidence for introgression on internal branches of the phylogeny. Our results suggest that the existing gametic incompatibilities among the strongylocentrotid urchin species have not been a complete barrier to hybridization and introgression following speciation. Their continued divergence in the face of widespread introgression indicates that other reproductive isolating barriers likely exist and may have been more critical in establishing reproductive isolation early in speciation.

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Section: Discussionmentioning

confidence: 66%

Extensive introgression among strongylocentrotid sea urchins revealed by phylogenomics

Glasenapp,

Pogson

2023

Ecology and Evolution

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“…On the other hand, it could be due to the release of spermatozoa and Note. 1 Means with different superscript lowercase letters in the same row indicate significant differences between different dietary groups in the same period at P <0:05. Means with superscript " * " indicate significant differences between different periods in the same group at P <0:05.…”

Section: Discussionmentioning

confidence: 99%

“…The gonads of sea urchins also called roe are worldwide wellknown for their unique texture, excellent taste, and high nutritional value, particularly in a few Asian, Mediterranean, and American nations [1,2]. Global climate change, tight fisheries management, rapidly rising market demand, and habitat destruction [2][3][4] have led to a shortage of wild sea urchins.…”

Section: Introductionmentioning

confidence: 99%

Effects of Supplementary Kelp Feeding on the Growth, Gonad Yield, and Nutritional and Organoleptic Quality of Subadult Sea Urchin (Strongylocentrotus intermedius) with Soya Lecithin Intake History

Di,

Heqiu,

Gou

et al. 2023

Aquaculture Nutrition

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A 23-week feeding experiment was conducted to investigate the effects of supplementary kelp feeding on the growth, gonad development, and nutritional and sensory properties of sea urchin (Strongylocentrotus intermedius) with soya lecithin (SL) intake history. The feeding experiment was divided into experimental phase I and phase II. During phase I, 48 subadult sea urchins (initial weight: 6.28 ± 0.07 g) were fed one of the feeds with different levels of SL (0%, 1.6%, 3.2%) or kelp (Saccharina japonica) for 12 weeks. Then, all sea urchins were fed kelp for the next 11 weeks during the phase II. Each diet was randomly allocated to six cages of sea urchins. The results of phase I showed that weight gain rate (WGR), gonadosomatic index (GSI), gonad sensory properties (color and texture), and essential amino acid (EAA) contents were not significantly affected by SL level in the feed groups. High level (3.2%) of SL suppressed gonad development of S. intermedius with retarded gametogenesis in the 3.2% SL group (stage Ⅱ) compared to those fed 0% and 1.6% SL groups (stage Ⅲ). Sea urchins fed dry feeds exhibited significantly lower WGR and values of color (redness and yellowness) and texture (hardness and gumminess) but higher contents of EAA in the gonads than those fed kelp. The n-3/n-6 polyunsaturated fatty acid (PUFA) and eicosapentaenoic acid (EPA) of gonads in the groups fed with dry feeds showed no significant differences, but were significantly lower than that of kelp group. At the end of phase II, the gonad yellowness and EPA content of gonads in all dry feed groups were significantly increased by supplementary kelp feeding, with a higher increase observed in S. intermedius with SL intake history, while arachidonic acid (ARA) content was significantly improved by supplementary kelp feeding in S. intermedius with SL intake history. Gonad texture was improved to some extent by supplementary kelp feeding. These results indicated that S. intermedius fed dry feeds showed significantly higher GSI and EAA but poorer organoleptic quality and lower n-3/n-6 PUFA and EPA than those fed kelp. Kelp supplementary feeding improved the fatty acid value and organoleptic quality of gonads, especially for the sea urchins with SL intake history.

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“…Furthermore, the surviving juveniles produce very few or no mature gamete cells, a pattern also observed in the Hemicentrotus pulcherrimus ♀ x S. intermedius ♂ cross (Liu et al, 2020).…”

Section: Possible Alternative Isolating Mechanisms Postzygotic Isolationmentioning

confidence: 56%

Extensive Introgression among Strongylocentrotid Sea Urchins Revealed by Phylogenomics

Glasenapp

Pogson

2023

Preprint

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Gametic isolation is thought to play an important role in the evolution of reproductive isolation in broadcast-spawning marine invertebrates. However, it remains uncertain whether gametic isolation typically develops early in the speciation process or accumulates after other reproductive barriers are already in place. It is also unknown whether gametic incompatibilities have effectively prevented introgression during later stages of divergence. Here, we use phylogenomic approaches to test whether the well-documented asymmetric gametic incompatibilities between strongylocentrotid urchins have been effective in preventing introgression. Despite a well-supported species tree, we found considerable phylogenetic discordance that cannot be explained by incomplete lineage sorting alone. There was strong support for introgression between at least four pairs of extant taxa: S. pallidus ↔ S. droebachiensis, S. intermedius ↔ S. pallidus, S. purpuratus ↔ S. fragilis, and M. franciscanus ↔ P. depressus. There was additional evidence for introgression on internal branches of the phylogeny. Although gametic incompatibilities may be important in species recognition and the maintenance of species boundaries in strongylocentrotid urchins, gametic isolation does not appear to have been an effective barrier to introgression. The continued divergence in the face of widespread introgression indicates that other reproductive isolating barriers likely exist and may have been more critical in establishing reproductive isolation early in speciation.

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Gonadal traits and nutrient compositions of novel sea urchin hybrids of Hemicentrotus pulcherrimus (♀) and Strongylocentrotus intermedius (♂)

Cited by 7 publications

References 17 publications

Extensive introgression among strongylocentrotid sea urchins revealed by phylogenomics

Extensive introgression among strongylocentrotid sea urchins revealed by phylogenomics

Effects of Supplementary Kelp Feeding on the Growth, Gonad Yield, and Nutritional and Organoleptic Quality of Subadult Sea Urchin (Strongylocentrotus intermedius) with Soya Lecithin Intake History

Extensive Introgression among Strongylocentrotid Sea Urchins Revealed by Phylogenomics

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