Genetic Basis of Reproductive Isolation in Torrey Pine (Pinus torreyana Parry): Insights From Hybridization and Adaptation

Evolutionary Applications, Год журнала: 2025, Номер 18(4)

Опубликована: Март 31, 2025

ABSTRACT Tree species are often locally adapted to their environments, but the extent which environmental adaptation contributes incipient speciation is unclear. One of rarest pines in world, Torrey pine ( Pinus torreyana Parry), persists naturally across one island and mainland population southern California. The two populations morphologically genetically differentiated experience some connectivity, making it an ideal system for assessing evolution reproductive isolation. Previous work has found evidence heterosis F1 mainland‐island hybrids, suggesting genetic rescue could be beneficial absence barriers. Using ddRADseq GWAS a common garden experiment island, mainland, individuals, we identified candidate loci environmentally driven isolation, function, relationship fitness proxies. By simulating neutral admixture between populations, that exhibited reduced heterozygosity F1s, selection against admixture. SNPs with were enriched growth pollination functions, variants involved barriers populations. locus strong associations proxies garden, allele conferring increased fitness. If this experiences divergent natural promote Finally, although hybridization largely fixation F1s initially, indicating likely due masking deleterious alleles, emergence isolation may diminish longer‐term benefits F2 or advanced‐generation hybrids. As interpopulation rescue, caution warranted where gene flow diverged result if have evolved.

Язык: Английский

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Meta-analysis reveals that phenotypic plasticity and divergent selection promote reproductive isolation during incipient speciation

Nature Ecology & Evolution, Год журнала: 2025, Номер 9(5), С. 833 - 844

Опубликована: Май 7, 2025

Язык: Английский

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Whether Darwin’s mystery of mysteries is actually mysterious depends on the species concept: A bird’s eye review

Ornithology, Год журнала: 2025, Номер unknown

Опубликована: Апрель 8, 2025

Abstract Speciation has been termed Darwin’s mystery of mysteries. I suggest that whether speciation is deemed mysterious species-concept dependent. review under the biological species concept (BSC) and phylogenetic (PSC) with a focus on geography evolutionary processes avian speciation. In birds, dominant geographic mode allopatry. Under BSC, requires intrinsic reproductive isolation between taxa, an epiphenomenon, process appeared because varied ways can arise sister taxa. Using to rank taxa as lead paraphyletic which are inappropriate for comparative studies. PSC, involves evolution diagnostic characteristics allopatric populations via genetic or phenotypic drift, natural selection, sexual not mysterious. Here place pairs New World warblers along continuum, revealed some currently considered actually retain ancestral ability hybridize. A BSC PSC classification Galapagos finches reveals differences owing hybridization. Any study should declare concept, criteria recognizing species, research program identify lineage divergence isolation.

Язык: Английский

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Resolving the Population Structure and Demographic History of the European Anchovy in the Northeast Atlantic: Tracking Historical and Contemporary Environmental Changes

Molecular Ecology, Год журнала: 2025, Номер unknown

Опубликована: Июнь 4, 2025

ABSTRACT The spatial distribution of the European anchovy has expanded in northern part its range Northeast Atlantic recent decades. However, whether this results from a northward shift southern conspecifics or expansion local population is unknown. Using for first time whole‐genome sequencing, we explore current patterns genetic diversity and sub‐structuring Atlantic, with special focus on recently North Sea areas. Genomic data suggested three distinct groups: Northern (North Kattegat), Southern (Ireland Central Portugal) Cadis (South Portugal). Despite most genome being homogenised by high levels gene flow characteristic small pelagic fish, several large regions differentiation were observed. This suggests that genomic boundaries might be maintained adaptation within chromosome structural variants (inversions). Admixture analysis indicates ongoing involves both migrants origin population. Historical demographic inference anchovies survived last glacial period sizes, followed split into groups at end maximum. group then as ice sheets retreated, an involving number individuals, which consistent retention diversity. In comparison other found (deeply divergent groups, no loss during expansion, mixing between groups) align well those sprat, while sardines fit pattern leading‐edge population, reduced much shallower divergence populations. study contributes to better understanding structure, shifts fish under climate change, informing conservation management efforts.

Язык: Английский

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The Species as a Reproductive Community Emerging From the Past

Bulletin of the Society of Systematic Biologists, Год журнала: 2023, Номер 2(1), С. 1 - 35

Опубликована: Дек. 8, 2023

Biologists and philosophers of science have been unable to fully resolve the decades-long controversy as what kind unit living biodiversity should receive valued label “species”: reproductive communities (among sexual organisms), genealogical groups, or clusters organisms that share traits. Among these choices, which represent a spectrum from process history observable outcome (respectively), latter (more operationalist) concepts are not viable. Species must embody imply cohesive integrating processes such interbreeding shared ecological pressures if they sufficient power bear burden we give them: predict explain traits across genome among organisms. This commitment is needed whether biologists use species taxonomic containers synthesize data, minimal phylogenetic units, actors in evolutionary diversification. These varied uses can be satisfied via concept community, but strict Biological Concept (BSC). Its two drawbacks focus on contemporary restriction intrinsic factors. Current compatibility may future matings, it does well genes already have. The alive today were shaped by isolating factors past, those present, whatever extent differ. most broadly-useful therefore see retrospectively, past. As well, BSC’s exclusion extrinsic renders each its units incomplete explanation synthesis. Reproductive nature isolated just (genetic) differences, also purely (e.g., geographic) Such real, natural entities whose integrated self-reinforcing constrained descent aligned distribution many Retrospective Community (RRCC), formalized mathematically multispecies coalescent models, justifies traditional practice taxonomists using morphological data seek echoes past cohesion. However, naturally deserve ranked species, demes populations, vexing question. There no natural, discrete broadly informative rank applies universally, perhaps even usually. To justified, justified for asexual sexuals. presence absence sex one example variability confront. Because vary clades, useful broadly-applicable cannot specify detailed mechanisms. Nor perfectly align named taxonomy with evolution, because structured match taxonomy’s partition boxes. Taxonomic approximate, only units. Settling retrospection, letting go meaning rank, accepting approximation allow biology turn far more daunting task: listening world understand interacting built distinction identity, emerging out into present day.

Язык: Английский

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