Connectivity patterns and gene flow among Chelon ramada populations

Pereira, Esmeralda; Mateus, Catarina S.; Alves, Maria Judite; Almeida, Rita Mendes de; Pereira, Joana; Quintella, Bernardo R.; Almeida, Pedro R.

doi:10.1016/j.ecss.2022.108209

Cited by 4 publications

(3 citation statements)

References 69 publications

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“…The existence of both continents enables C. ramada to take advantage of temporal windows of favorable conditions for both adult and offspring survival (Mañanós et al 2008 ). This may also explain the extended spawning periods observed across C. ramada distribution (Bruslé, 1981 ), as well as the existence of protracted recruitment events (Bartulovic et al 2007 ; González-Castro and Minos 2016 ), and the maintenance of a unique species metapopulation (Pereira et al 2023 ). In this sense, besides the lower predation from piscivorous fish and having a low dietary overlap with other mugillids (Salvarina et al 2018 ), migratory behavior to freshwater appears to promote a conditional reproductive strategy.…”

Section: Discussionmentioning

confidence: 99%

Do catadromous thinlip grey mullet benefit from shifting to freshwater? A perspective from fatty acid signature analysis

Pereira,

Jorge,

Quintella

et al. 2024

Fish Physiol Biochem

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To investigate the potential benefits of the catadromous thinlip grey mullet (Chelon ramada Risso, 1827) migration to freshwater, the total lipid content and fatty acid (FA) profile of female’s muscle and gonads caught in both the estuary and river were analyzed. The freshwater contingent presented a higher body condition, greater muscle gross energy, and larger gonads with higher lipid reserves. These animals showed a muscle profile rich in C16:1n-7 and lower LC-PUFA that contrast with the higher relative amount of C18:1n-9, n-3 FA, and unsaturated LC-PUFA, such as C18 and C20 FA found in the estuarine contingent. The gonads of both contingents showed a constant and high relative amount of polyunsaturated FAs (PUFA, 37%). However, in terms of essential fatty acids (EFAs), the estuarine contingent had a higher relative amount of C18:2n-6, C20:4n-6, C20:5n-3, and C22:6n-3. On the other hand, the freshwater contingent showed a higher relative amount of n-3 FA precursors, namely C18:3n-3, and a still low relative amount of C22:6n-3. This suggests a mismatch between the metabolic omega-3 pathway and the physiological maturity stages, similar to a phenomenon of dormancy. In this sense, not all these individuals may reproduce annually, and the later stages of gonad development will require supplementary energy derived from feeding at the estuary. Thus, freshwater migration may promote a reproductive strategy enabling adults to take advantage of the warm and food-rich summer/autumn period, adjust spawning and juvenile appearance, and reduce the population’s exposure to habitat changes and/or stochastic events.

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Section: Discussionmentioning

confidence: 99%

Do catadromous thinlip grey mullet benefit from shifting to freshwater? A perspective from fatty acid signature analysis

Pereira,

Jorge,

Quintella

et al. 2024

Fish Physiol Biochem

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Section: Introductionmentioning

confidence: 99%

“…Genetic connectivity is essential in maintaining diversity and promoting the evolution of marine organisms, and depends on factors such as dispersal ability, reproductive traits, seafloor topology, and environmental conditions (Blanchard & Gollner, 2022; Brunner et al., 2023; De Wit et al., 2023; Faria et al., 2021; Ingels et al., 2023; Mouchi et al., 2023; Pereira et al., 2023; Plouviez et al., 2013, 2019; Portanier et al., 2023; Virtanen et al., 2020; Yahagi et al., 2017). High dispersal ability promotes gene flow over long distances, while seafloor topology can create physical barriers that impede movement and lead to allopatric speciation (Ingels et al., 2023; Plouviez et al., 2013, 2019; Yahagi et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

Highly structured populations of copepods at risk to deep‐sea mining: Integration of genomic data with demogenetic and biophysical modelling

Diaz‐Recio Lorenzo,

Tran Lu Y,

Brunner

et al. 2024

Molecular Ecology

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Copepoda is the most abundant taxon in deep‐sea hydrothermal vents, where hard substrate is available. Despite the increasing interest in seafloor massive sulphides exploitation, there have been no population genomic studies conducted on vent meiofauna, which are known to contribute over 50% to metazoan biodiversity at vents. To bridge this knowledge gap, restriction‐site‐associated DNA sequencing, specifically 2b‐RADseq, was used to retrieve thousands of genome‐wide single‐nucleotide polymorphisms (SNPs) from abundant populations of the vent‐obligate copepod Stygiopontius lauensis from the Lau Basin. SNPs were used to investigate population structure, demographic histories and genotype–environment associations at a basin scale. Genetic analyses also helped to evaluate the suitability of tailored larval dispersal models and the parameterization of life‐history traits that better fit the population patterns observed in the genomic dataset for the target organism. Highly structured populations were observed on both spatial and temporal scales, with divergence of populations between the north, mid, and south of the basin estimated to have occurred after the creation of the major transform fault dividing the Australian and the Niuafo'ou tectonic plate (350 kya), with relatively recent secondary contact events (<20 kya). Larval dispersal models were able to predict the high levels of structure and the highly asymmetric northward low‐level gene flow observed in the genomic data. These results differ from most studies conducted on megafauna in the region, elucidating the need to incorporate smaller size when considering site prospecting for deep‐sea exploitation of seafloor massive sulphides, and the creation of area‐based management tools to protect areas at risk of local extinction, should mining occur.

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Development of a microsatellite marker resource for the thin-lipped mullet, Chelon ramada (Risso, 1827)

Meziane,

Guinand,

Kara

et al. 2024

Biologia

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Connectivity patterns and gene flow among Chelon ramada populations

Cited by 4 publications

References 69 publications

Do catadromous thinlip grey mullet benefit from shifting to freshwater? A perspective from fatty acid signature analysis

Do catadromous thinlip grey mullet benefit from shifting to freshwater? A perspective from fatty acid signature analysis

Highly structured populations of copepods at risk to deep‐sea mining: Integration of genomic data with demogenetic and biophysical modelling

Development of a microsatellite marker resource for the thin-lipped mullet, Chelon ramada (Risso, 1827)

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