Transoceanic dispersal and cryptic diversity in a cosmopolitan rafting nudibranch

2016 ◽  
Vol 30 (3) ◽  
pp. 290 ◽  
Author(s):  
Jennifer S. Trickey ◽  
Martin Thiel ◽  
Jonathan M. Waters
Keyword(s):  
Species Complex ◽  
Nuclear Dna ◽  
Sequence Data ◽  
Cryptic Diversity ◽  
Its1 Region ◽  
Dna Sequence Data ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Mtdna Lineages ◽  
Transoceanic Dispersal

The aeolid nudibranch Fiona pinnata (Eschscholtz, 1831) is an obligate rafter that occurs exclusively on macroalgal rafts and other floating substrata, and has a seemingly cosmopolitan marine distribution. Mitochondrial (mtDNA) and nuclear DNA sequence data were generated from specimens collected worldwide to test for global connectivity in this species. Phylogeographic analyses revealed three divergent mtDNA lineages, two of which were abundant and widespread. One of these lineages has an apparent circumequatorial distribution, whereas the other may have an antitropical distribution within the Pacific Ocean. Low genetic divergences within each lineage suggest that rafting can mediate dispersal across transoceanic scales. A third, highly divergent, lineage was detected in a single Indonesian specimen. Broadly concordant phylogeographic relationships were detected for the nuclear ITS1 region, with distinct tropical versus antitropical lineages observed. The substantial genetic divergences and largely allopatric distributions observed among the F. pinnata lineages suggest that they represent a species complex.

A new giant anole (Squamata: Iguanidae: Dactyloinae) from southwestern Ecuador

Zootaxa ◽  
2021 ◽  
Vol 4991 (2) ◽  
pp. 295-317
Author(s):  
FERNANDO AYALA-VARELA ◽  
SEBASTIÁN VALVERDE ◽  
STEVEN POE ◽  
ANDREA E. NARVÁEZ ◽  
MARIO H. YÁNEZ-MUÑOZ ◽  
...  
Keyword(s):  
New Species ◽  
Nuclear Dna ◽  
Sequence Data ◽  
Phylogenetic Analyses ◽  
Dna Sequence Data ◽  
Anolis Lizard ◽  
The Andes ◽  
The Pacific ◽  
Southern Ecuador ◽  
A New Species

We describe a new species of Anolis lizard from the Pacific slopes of the Andes of southwestern Ecuador at elevations between 372–1,000 m. The new species belongs to the Dactyloa clade and may be distinguished from other Anolis by size, external anatomy, mitochondrial DNA divergence, and dewlap color. Based on phylogenetic analyses of mitochondrial and nuclear DNA sequence data, we found that the new species is sister to A. fraseri in a clade composed primarily of large Dactyloid species. The new species is known from a protected area in southern Ecuador, Buenaventura Reserve, which suggests that at least some its populations are well protected.  

scholarly journals Phylogeny of the Sepia pharaonis species complex (Cephalopoda: Sepiida) based on analyses of mitochondrial and nuclear DNA sequence data

2010 ◽  
Vol 77 (1) ◽  
pp. 65-75 ◽  
Author(s):  
F. E. Anderson ◽  
R. Engelke ◽  
K. Jarrett ◽  
T. Valinassab ◽  
K. S. Mohamed ◽  
...  
Keyword(s):  
Dna Sequence ◽  
Species Complex ◽  
Nuclear Dna ◽  
Sequence Data ◽  
Dna Sequence Data ◽  
Sepia Pharaonis

Phylogeny, taxonomy, and zoogeography of the genus Gekko Laurenti, 1768 with the revalidation of G. reevesii Gray, 1831 (Sauria: Gekkonidae)

Zootaxa ◽  
2011 ◽  
Vol 2989 (1) ◽  
pp. 1 ◽  
Author(s):  
HERBERT RÖSLER ◽  
AARON M. BAUER ◽  
MATTHEW P. HEINICKE ◽  
ELI GREENBAUM ◽  
TODD JACKMAN ◽  
...  
Keyword(s):  
Dna Sequence ◽  
Molecular Phylogenetics ◽  
Nuclear Dna ◽  
Sequence Data ◽  
Identification Key ◽  
Dna Sequence Data ◽  
Preliminary Identification ◽  
Specific Rank ◽  
Species Groups

A review of the taxonomy, phylogeny, and zoogeography of all currently recognized Gekko species is provided based on morphology (including size, scalation, color, and pattern) and mitochondrial and nuclear DNA sequence data. We distinguish six morphological (phenotypic) species groups within the gekkonid genus Gekko: the G. gecko, G. japonicus, G. monarchus, G. petricolus, G. porosus, and G. vittatus groups, all of which receive support from molecular phylogenetics. The taxon G. reevesii, formerly evaluated as a synonym of G. gekko, is revalidated herein at specific rank. Furthermore, a preliminary identification key of all currently recognized Gekko taxa is provided.

New genetic lineages within Moroccan day geckos Quedenfeldtia (Sphaerodactylidae) revealed by mitochondrial and nuclear DNA sequence data

2017 ◽  
Vol 38 (1) ◽  
pp. 97-101 ◽  
Author(s):  
David James Harris ◽  
Daniela Rosado ◽  
Raquel Xavier ◽  
Daniele Salvi
Keyword(s):  
Nuclear Dna ◽  
Sequence Data ◽  
Phylogenetic Reconstruction ◽  
Taxonomic Revision ◽  
Substantial Portion ◽  
Genetic Lineages ◽  
Mountainous Regions ◽  
Dna Sequence Data ◽  
Atlas Mountains ◽  
Morphological Assessment

The genus Quedenfeldtia is composed of two species, Q. moerens and Q. trachyblepharus, both endemic to the Atlas Mountains region of Morocco. Previous studies recovered two main genetic lineages within each Quedenfeldtia species, although sampling did not cover a substantial portion of their known distribution. In this study we collected individuals from previously unsampled localities of Quedenfeldtia and carried out genetic analyses in order to assess the range of previously identified lineages and the occurrence of additional lineages. Phylogenetic reconstruction based on both mitochondrial (12S and ND4 + tRNA) and nuclear (MC1R) markers revealed that while the new individuals of Q. moerens belong to previously described lineages, two new lineages of Q. trachyblepharus were uncovered from the northern and southern parts of the range. Genetic divergence of these new lineages (8-9% ND4 + tRNA p-distance) was higher than values observed between other lizard sister species. In the future a thorough morphological assessment is needed to complement this study and allow a taxonomic revision of these taxa. The results of this study highlight the importance of biodiversity assessments in mountainous regions characterized by high endemicity but which are difficult to access.

Validation of three sympatric Thoracophelia species (Annelida: Opheliidae) from Dillon Beach, California using mitochondrial and nuclear DNA sequence data

Zootaxa ◽  
2013 ◽  
Vol 3608 (1) ◽  
pp. 67-74 ◽  
Author(s):  
Chris J. LAW ◽  
KELLY M. DORGAN ◽  
GREG W. ROUSE
Keyword(s):  
Dna Sequence ◽  
Nuclear Dna ◽  
Sequence Data ◽  
Hemoglobin Concentration ◽  
Sympatric Species ◽  
Sandy Beaches ◽  
Additional Species ◽  
Dna Sequence Data ◽  
C Subunit ◽  
Coi Sequences

Thoracophelia (Annelida, Opheliidae) are burrowing deposit feeders generally found in the mid- to upper intertidal areas of sandy beaches. Thoracophelia mucronata (Treadwell, 1914) is found along the west coast of North America, including at Dillon Beach, CA. Two additional species, Thoracophelia dillonensis (Hartman, 1938) and T. williamsi (Hartman, 1938) were also described from this beach. These three sympatric species have been primarily distinguished by branchial morphology, and efforts to determine the validity of the species have been based on morphological, reproductive and ecological studies. Here we demonstrate using mitochondrial and nuclear DNA sequence data that these three species are valid. Mitochondrial Cytochrome c subunit 1 (COI) sequences show uncorrected interspecific distances of ~9–13%. We found no inter—specific differences in body color or in hemoglobin concentration, but found that reproductive males were pinkish-red in color and had lower hemoglobin concentrations than purplish—red reproductive females.

Genetic analyses of the parasitic nematode, Parelaphostrongylus tenuis, in Missouri and Kentucky reveal unexpected levels of diversity and population differentiation

Parasitology ◽  
2020 ◽  
pp. 1-11
Author(s):  
L. S. Eggert ◽  
L. K. Berkman ◽  
K. Budd ◽  
B. J. Keller ◽  
A. M. Hildreth ◽  
...  
Keyword(s):  
Nuclear Dna ◽  
Disease Risk ◽  
Sequence Data ◽  
Release Site ◽  
Primary Host ◽  
Dna Sequence Data ◽  
Increased Risk ◽  
Parelaphostrongylus Tenuis ◽  
Risk Of Disease ◽  
High Level

Abstract Wildlife translocations, which involve the introduction of naive hosts into new environments with novel pathogens, invariably pose an increased risk of disease. The meningeal worm Parelaphostrongylus tenuis is a nematode parasite of the white-tailed deer (Odocoileus virginianus), which serves as its primary host and rarely suffers adverse effects from infection. Attempts to restore elk (Cervus canadensis) to the eastern US have been hampered by disease caused by this parasite. Using DNA sequence data from mitochondrial and nuclear genes, we examined the hypothesis that elk translocated within the eastern US could be exposed to novel genetic variants of P. tenuis by detailing the genetic structure among P. tenuis taken from white-tailed deer and elk at a source (Kentucky) and a release site (Missouri). We found high levels of diversity at both mitochondrial and nuclear DNA in Missouri and Kentucky and a high level of differentiation between states. Our results highlight the importance of considering the potential for increased disease risk from exposure to novel strains of parasites in the decision-making process of a reintroduction or restoration.

scholarly journals Veterinary Fusarioses within the United States

2016 ◽  
Vol 54 (11) ◽  
pp. 2813-2819 ◽  
Author(s):  
Kerry O'Donnell ◽  
Deanna A. Sutton ◽  
Nathan Wiederhold ◽  
Vincent A. R. G. Robert ◽  
Pedro W. Crous ◽  
...  
Keyword(s):  
United States ◽  
Dna Sequence ◽  
Species Complex ◽  
Sequence Data ◽  
Phylogenetic Analyses ◽  
Distinct Species ◽  
The United States ◽  
Content Type ◽  
Dna Sequence Data ◽  
Species Complexes

Multilocus DNA sequence data were used to assess the genetic diversity and evolutionary relationships of 67Fusariumstrains from veterinary sources, most of which were from the United States. Molecular phylogenetic analyses revealed that the strains comprised 23 phylogenetically distinct species, all but two of which were previously known to infect humans, distributed among eight species complexes. The majority of the veterinary isolates (47/67 = 70.1%) were nested within theFusarium solanispecies complex (FSSC), and these included 8 phylospecies and 33 unique 3-locus sequence types (STs). Three of the FSSC species (Fusarium falciforme,Fusarium keratoplasticum, andFusariumsp. FSSC 12) accounted for four-fifths of the veterinary strains (38/47) and STs (27/33) within this clade. Most of theF. falciformestrains (12/15) were recovered from equine keratitis infections; however, strains ofF. keratoplasticumandFusariumsp. FSSC 12 were mostly (25/27) isolated from marine vertebrates and invertebrates. Our sampling suggests that theFusarium incarnatum-equisetispecies complex (FIESC), with eight mycoses-associated species, may represent the second most important clade of veterinary relevance withinFusarium. Six of the multilocus STs within the FSSC (3+4-eee, 1-b, 12-a, 12-b, 12-f, and 12-h) and one each within the FIESC (1-a) and theFusarium oxysporumspecies complex (ST-33) were widespread geographically, including three STs with transoceanic disjunctions. In conclusion, fusaria associated with veterinary mycoses are phylogenetically diverse and typically can only be identified to the species level using DNA sequence data from portions of one or more informative genes.

Sign in / Sign up

Export Citation Format

Share Document