The planktonic food web of the Bizerte lagoon (south-western Mediterranean) during summer: I. Spatial distribution under different anthropogenic pressures

Hlaili, Asma Sakka; Grami, Boutheina; Niquil, Nathalie; Gosselin, Michel; Hamel, Dominique; Troussellier, Marc; Mabrouk, Hassine Hadj

doi:10.1016/j.ecss.2007.11.010

Cited by 49 publications

(24 citation statements)

References 79 publications

(99 reference statements)

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“…), which is ecologically similar to the Thau lagoon (Sakka Hlaili et al. ), has a population genetically similar to marine Mediterranean samples at most loci but share the genetic composition of the Thau lagoon at the genomic island loci (Fig. and ).…”

Section: Discussionmentioning

confidence: 83%

Parallel pattern of differentiation at a genomic island shared between clinal and mosaic hybrid zones in a complex of cryptic seahorse lineages

et al. 2019

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Diverging semi‐isolated lineages either meet in narrow clinal hybrid zones, or have a mosaic distribution associated with environmental variation. Intrinsic reproductive isolation is often emphasized in the former and local adaptation in the latter, although both reduce gene flow between groups. Rarely are these two patterns of spatial distribution reported in the same study system. Here, we report that the long‐snouted seahorse Hippocampus guttulatus is subdivided into discrete panmictic entities by both types of hybrid zones. Along the European Atlantic coasts, a northern and a southern lineage meet in the southwest of France where they coexist in sympatry—i.e., in the same geographical zone—with little hybridization. In the Mediterranean Sea, two lineages have a mosaic distribution, associated with lagoon‐like and marine habitats. A fifth lineage was identified in the Black Sea. Genetic homogeneity over large spatial scales contrasts with isolation maintained in sympatry or close parapatry at a fine scale. A high variation in locus‐specific introgression rates provides additional evidence that partial reproductive isolation must be maintaining the divergence. We find that fixed differences between lagoon and marine populations in the Mediterranean Sea belong to the most differentiated SNPs between the two Atlantic lineages, against the genome‐wide pattern of structure that mostly follow geography. These parallel outlier SNPs cluster on a single chromosome‐wide island of differentiation. Since Atlantic lineages do not map to lagoon‐sea habitat variation, genetic parallelism at the genomic island suggests a shared genetic barrier contributes to reproductive isolation in contrasting contexts–i.e., spatial versus ecological. We discuss how a genomic hotspot of parallel differentiation could have evolved and become associated both with space and with a patchy environment in a single study system.

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Section: Discussionmentioning

confidence: 83%

Parallel pattern of differentiation at a genomic island shared between clinal and mosaic hybrid zones in a complex of cryptic seahorse lineages

et al. 2019

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“…Hydrological and circulation patterns are mainly influenced by wind intensity and freshwater discharge (Harzallah, 2003). The lagoon ecosystem is considered to have undergone eutrophication (Sakka Hlaili et al, 2008) as a result of poor circulation and continuous inputs of nutrients and organic matter from internal (developed shellfish farming) and external (urban, industrial and agricultural) sources.…”

Section: Study Area and Sampling Stationmentioning

confidence: 99%

Driving factors of the potentially toxic and harmful species of Prorocentrum Ehrenberg in a semi-enclosed Mediterranean lagoon (Tunisia, SW Mediterranean)

Sahraoui¹,

Bouchouicha

Mabrouk

et al. 2013

Medit. Mar. Sci.

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We analysed the dynamics of the potentially toxic and harmful species of Prorocentrum Ehrenberg in Bizerte Lagoon (important aquaculture area, Northern Tunisia), substantiating the possible driving forces (temperature, salinity and nutrients), based on a two-year database. We revealed that Prorocentrum spp. blooms of high magnitude (10 4 -10 5 cells l -1 ) occurred mostly during the period of late winter to early spring. We found five species of Prorocentrum, two of which, namely P. lima and P. cordatum, the most common during the field, are confirmed agents of Diarrhetic Shellfish Poisoning in various regions of the world. Prorocentrum sp., P. micans and P. gracile were however present only sporadically but with high cell abundances, exemplifying bloom densities. Canonical correspondence analysis revealed that P. minimum and P. lima were much more abundant in eutrophic waters characterized by high Chl a biomass, while P. gracile species occurred principally in warm waters. Furthermore, Prorocentrum sp. and P. micans seemed more likely to proliferate in saline waters with high concentrations of inorganic nutrients (nitrate, ammonia and phosphate). Our study calls attention to a possible intensification of DSP events in Bizerte Lagoon, given the propensity of Prorocentrum spp. to proliferate in a eutrophic system.

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“…Indeed, the Bizerte lagoon (site 20 in Fig. 1), which is ecologically similar to the Thau lagoon (Sakka Hlaili et al 2008), has a population genetically similar to marine Mediterranean samples at most loci and only share the genetic composition of the Thau lagoon at the genomic island ( Fig. 4 and SI3B).…”

Section: -Sea and Lagoon Ecotypes In The Mediterranean Seamentioning

confidence: 99%

Parallel pattern of differentiation at a genomic island shared between clinal and mosaic hybrid zones in a complex of cryptic seahorse lineages

Riquet

Liautard‐Haag

Woodall

et al. 2017

Preprint

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33Diverging semi-isolated lineages either meet in narrow clinal hybrid zones, or have a 34 mosaic distribution associated with environmental variation. Intrinsic reproductive 35 isolation is often emphasized in the former and local adaptation in the latter, although 36 both can contribute to isolation. Rarely these two patterns of spatial distribution are 37 reported in the same study system, while this could provide fundamental information on 38 the endless debate about the relative contribution of intrinsic reproductive isolation and 39 local adaptation on the speciation process. Here we report that the low diversity long-40 snouted seahorse Hippocampus guttulatus is genetically subdivided into five cryptic 41 semi-isolated lineages. Along the Atlantic coasts, northern and southern lineages meet 42 and coexist with little hybridization in the southwest of France, forming a clinal hybrid 43 zone. In the Mediterranean Sea, two lineages have a mosaic distribution associated with 44 lagoon-like and marine habitats. A fifth lineage was identified in the Black Sea. Genetic 45 homogeneity over large spatial scales within each lineage, together with among-locus 46 . CC-BY-NC-ND 4.0 International license It is made available under a was not peer-reviewed) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity.The copyright holder for this preprint (which . http://dx.doi.org/10.1101/161786 doi: bioRxiv preprint first posted online Jul. 10, 2017;. CC-BY-NC-ND4.0 International license It is made available under a was not peer-reviewed) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. The copyright holder for this preprint (which . http://dx.doi.org/10.1101/161786 doi: bioRxiv preprint first posted online Jul. 10, 2017;. CC-BY-NC-ND 4.0 International license It is made available under a was not peer-reviewed) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity.The copyright holder for this preprint (which . http://dx.doi.org/10.1101/161786 doi: bioRxiv preprint first posted online Jul. 10, 2017;. CC-BY-NC-ND 4.0 International license It is made available under a was not peer-reviewed) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity.The copyright holder for this preprint (which . http://dx.doi.org/10.1101/161786 doi: bioRxiv preprint first posted online Jul. 10, 2017;. CC-BY-NC-ND 4.0 International license It is made available under a was not peer-reviewed) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity.The copyright holder for this preprint (which . http://dx.doi.org/10.1101/161786 doi: bioRxiv preprint first posted online Jul. 10, 2017; variance in differentiation levels between lineages and spatial patterns of introgression 47 provide evidence that partial reproductive isolation is maintaining the divergence.

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The planktonic food web of the Bizerte lagoon (south-western Mediterranean) during summer: I. Spatial distribution under different anthropogenic pressures

Cited by 49 publications

References 79 publications

Parallel pattern of differentiation at a genomic island shared between clinal and mosaic hybrid zones in a complex of cryptic seahorse lineages

Parallel pattern of differentiation at a genomic island shared between clinal and mosaic hybrid zones in a complex of cryptic seahorse lineages

Driving factors of the potentially toxic and harmful species of Prorocentrum Ehrenberg in a semi-enclosed Mediterranean lagoon (Tunisia, SW Mediterranean)

Parallel pattern of differentiation at a genomic island shared between clinal and mosaic hybrid zones in a complex of cryptic seahorse lineages

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