The role of enzyme electrophoresis is discussed as it applies to taxonomy and systematics. particularly invertebrates. Details are given methods for distinguishing identifying cryptic or sibling species the different approaches sympatric allopatric populations reviewed. calculation uses genetic distance measures outlined. empirical relationship such levels taxonomic separation. Defficulties. drawbacks limitations technique explained together with advantages. Evidence molecular clocks...

Phylogenetic gaps of public databases reference sequences are a major obstacle for comparative genomics and management marine resources, particularly in the Global South, where economically important fisheries conservation flagship species often lack closely-related references. We applied target-enrichment to obtain complete mitochondrial genomes ichthyofauna from Brazilian coast selected based on economic significance, status phylogenetically-close These included sardines (Dorosomatidae,...

The sponge species Chondrilla nucula has a simple morphology and very wide geographical distribution. To verify whether the latter might be an artifact of former, samples this were collected across 10,000 km its range, in Mediterranean, Caribbean, southwestern atlantic. classical (spicule morphology) molecular (allozymes) systematic approaches compared, to try define geographic limits between populations detect possible cryptic species. We found five distinct genetic forms within C. that...

Franciscanas are the most endangered dolphins in Southwestern Atlantic. Due to their coastal and estuarine habits, franciscanas suffer from extensive fisheries bycatch, as well habitat loss degradation. Four Franciscana Management Areas (FMA), proposed based on biology, demography, morphology genetic data, were incorporated into management planning delineation of research efforts. We re-evaluated that proposal through analysis control region sequences throughout distribution range (N = 162),...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 426:197-212 (2011) - DOI: https://doi.org/10.3354/meps09035 Phylogeny and phylogeography of Atlantic oyster species: evolutionary history, limited genetic connectivity isolation by distance C. Lazoski1, J. Gusmão1,2, P. Boudry3, A. M. Solé-Cava1,* 1Laboratório de Biodiversidade Molecular – Departamento...

Marine sponges are an ecologically important and highly diverse component of marine benthic communities, found in all the world's oceans, at depths. Although their commercial potential evolutionary importance is increasingly recognized, many pivotal aspects basic biology remain enigmatic. Knowledge historical biogeographic affinities biodiversity patterns rudimentary, there still few data about genetic variation among sponge populations spatial this variation. Biodiversity analyses tropical...

The predictions of neutralist and selectionist hypotheses have been tested many times in the past, but mostly using data only from organisms such as vertebrates, with generally low to average heterozygosities. more recent discovery particularly high levels genetic variation marine sponges coelenterates provides an opportunity use species contribute further understanding determinants heterozygosity natural populations. Therefore, 23 temperate, tropical boreal waters were analysed by gel...

Abstract Since evolutionary processes, such as dispersal, adaptation and drift, occur in a geographical context, at multiple hierarchical levels, biogeography provides central important unifying framework for understanding the patterns of distribution life on Earth. However, advent molecular markers has allowed clearer evaluation relationships between microevolutionary processes genetic divergence among populations space, triggering rapid development many research programmes. Here we provide...

The taxonomy of common dolphins (Delphinus sp.) has always been controversial, with over twenty described species since the original description type genus delphis Linnaeus, 1758). Two and four subspecies are currently accepted, but recent molecular data have challenged this view. In study we investigated through analyses cytochrome b sequences 297 individuals from most their distribution. We included 37 novel Southwestern Atlantic Ocean, a region where short- long-beaked morphotypes occur...

The demosponge Oscarella lobularis (Schmidt, 1862) has been reported from various localities throughout the world and is abundant in many areas. It considered to be morphologically very variable, morphs of different colour or texture can found living sympatrically. Samples a soft violet morph cartilaginous blue, yellow green were collected Mediterranean Sea, near Marseilles. genetic divergence four was estimated by enzyme electrophoresis, cytological differences studied using light...

There is no consensus as to the level of intraspecific morphological plasticity in calcareous sponges, and so many species described nineteenth century were lumped into a few supposedly very polymorphic during 20th century. Leucetta floridana was originally from Florida, but subsequently considered junior synonym Pacific microraphis, spite presence, L. only, two size classes tetractine spicules. We have compared, through DNA sequencing (ribosomal internal transcribed spacers, ITS1 ITS2)...

Populations of Ocyurus chrysurus were compared genetically and morphometrically along the West Atlantic coast to test null hypothesis population homogeneity in area. Brazilian populations found be differentiated shape (canonical variates analysis; F[48,515] = 10.84, p < 0.0001). Analyses mitochondrial DNA sequences (663 bp control region) did not show any differences between but could detect Caribbean (Belize) populations. The samples from Pernambuco differed significantly other allozyme...

In 2000, Brazil reported 180,137 cases of dengue, ≈80% the total in Americas. However, little is known about gene flow among vector populations Brazil. Random amplified polymorphic DNA (RAPD) was used to study genetic structure Aedes aegypti 15 from five states, with a range extending 2,800 km. An analysis 47 RAPD loci estimated at macro- (different states) and micro- cities) geographical levels. Genetic polymorphism high (HS = 0.274), levels differentiation existed both between different...

Molecular data have provided many insights into cetacean evolution but some unsettled issues still remain. We estimated the topology and timing of evolutionary relationships using Bayesian maximum likelihood analyses complete mitochondrial genomes. In order to clarify phylogenetic placement Sotalia Steno within Delphinidae, we sequenced three new delphinid mitogenomes. Our support clades: one joining (supporting revised subfamily Stenoninae); another placing Sousa Delphininae; a third,...