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Characterization of polymorphic microsatellite loci in the Antarctic krill Euph...
Candeias, R.; Teixeira, Sara; Duarte, C. M.; Pearson, G. A.Background: The Antarctic krill, Euphausia superba is a pelagic crustacean, abundant in high-density swarms (10 000 – 30 000 ind/m2) with a circumpolar distribution and a key role in the food web of the Southern Ocean. Only three EST derived microsatellite markers have been used in previous genetic studies, hence we developed additional highly polymorphic microsatellite markers to allow robust studies of the ge...
Shift happens: trailing edge contraction associated with recent warming trends ...
Nicastro, K. R.; Zardi, G. I.; Teixeira, Sara; Neiva, J.; Serrão, Ester; Pearson, G. A.Significant effects of recent global climate change have already been observed in a variety of ecosystems, with evidence for shifts in species ranges, but rarely have such consequences been related to the changes in the species genetic pool. The stretch of Atlantic coast between North Africa and North Iberia is ideal for studying the relationship between species distribution and climate change as it includes th...
Sex-biased gene expression in the brown alga Fucus vesiculosus
Martins, Maria João F.; Mota, Catarina F.; Pearson, G. A.Background The fucoid brown algae (Heterokontophyta, Phaeophyceae) are increasingly the focus of ecological genetics, biodiversity, biogeography and speciation research. The molecular genetics underlying mating system variation, where repeated dioecious – hermaphrodite switches during evolution are recognized, and the molecular evolution of sex-related genes are key questions currently hampered by a lack of gen...
Fine-scale genetic breaks driven by historical rangedynamics and ongoing densit...
Neiva, J.; Pearson, G. A.; Valero, M.; Serrão, EsterFactors promoting the emergence of sharp phylogeographic breaks include restricted dispersal, habitat discontinuity, physical barriers, disruptive selection, mating incompatibility, genetic surfing and secondary contact. Disentangling the role of each in any particular system can be difficult, especially when species are evenly distributed across transition zones and dispersal barriers are not evident. The estu...
Love thy neighbour: group properties of gaping behaviour in mussel aggregations
Nicastro, K. R.; Zardi, G. I.; McQuaid, C. D.; Pearson, G. A.; Serrão, EsterBy associating closely with others to form a group, an animal can benefit from a number of advantages including reduced risk of predation, amelioration of environmental conditions, and increased reproductive success, but at the price of reduced resources. Although made up of individual members, an aggregation often displays novel effects that do not manifest at the level of the individual organism. Here we show...
Prezygotic barriers to hybridization in marine broadcast spawners: Reproductive...
Monteiro, C. A.; Serrão, Ester; Pearson, G. A.Sympatric assemblages of congeners with incomplete reproductive barriers offer the opportunity to study the roles that ecological and non-ecological factors play in reproductive isolation. While interspecific asynchrony in gamete release and gametic incompatibility are known prezygotic barriers to hybridization, the role of mating system variation has been emphasized in plants. Reproductive isolation between th...
Characterization of ten highly polymorphic microsatellite loci for the intertid...
Coelho, N. C.; Zardi, G. I.; Pearson, G. A.; Serrão, Ester; Nicastro, K. R.The brown mussel Perna perna (Linnaeus, 1758) is a dominant constituent of intertidal communities and a strong invader with multiple non-native populations distributed around the world. In a previous study, two polymorphic microsatellite loci were developed and used to determine population-level genetic diversity in invasive and native P. perna populations. However, higher number of microsatellite markers are r...
Development and characterization of 35 single nucleotide polymorphism markers f...
Cánovas, Fernando G.; Mota, Catarina F.; Ferreira Costa, J.; Serrão, Ester; Coyer, J. A.; Olsen, J. L.; Pearson, G. A.We characterized 35 single nucleotide polymorphism (SNP) markers for the brown alga Fucus vesiculosus. Based on existing Fucus Expressed Sequence Tag libraries for heat and desiccation-stressed tissue, SNPs were developed and confirmed by re-sequencing cDNA from a diverse panel of individuals. SNP loci were genotyped using the SEQUENOM single base extension iPLEXTM system for multiplex assays on the MassARRAY p...
Adaptive traits are maintained on steep selective gradients despite gene flow a...
Zardi, G. I.; Nicastro, K. R.; Cánovas, Fernando G.; Costa, J. F.; Serrão, Ester; Pearson, G. A.Gene flow among hybridizing species with incomplete reproductive barriers blurs species boundaries, while selection under heterogeneous local ecological conditions or along strong gradients may counteract this tendency. Congeneric, externallyfertilizing fucoid brown algae occur as distinct morphotypes along intertidal exposure gradients despite gene flow. Combining analyses of genetic and phenotypic traits, we ...
Driving south: A multi-gene phylogeny of the brown algal family Fucaceae reveal...
Cánovas, Fernando G.; Mota, Catarina F.; Serrão, Ester; Pearson, G. A.Background: Understanding the processes driving speciation in marine ecosystems remained a challenge until recently, due to the unclear nature of dispersal boundaries. However, recent evidence for marine adaptive radiations and ecological speciation, as well as previously undetected patterns of cryptic speciation is overturning this view. Here, we use multi-gene phylogenetics to infer the family-level evolution...
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