scholarly journals Phylogeny, Phylogeography and Population Connectivity of Lessonia (Phaeophyceae)

2021 ◽  
Author(s):  
◽  
Peter Martin
Keyword(s):  
New Zealand ◽  
South America ◽  
Cryptic Species ◽  
Population Connectivity ◽  
Disjunct Distribution ◽  
South American ◽  
Rocky Shores ◽  
South American Species ◽  
Cook Strait ◽  
Algal Genus

<p>The brown algal genus Lessonia is distributed in the Southern Hemisphere where it can form dominant kelp beds on the exposed rocky shores of New Zealand, South America and Tasmania. Its disjunct distribution within the West Wind Drift contrasts with the view that it is a poor disperser. Apart from studies in Chile, where it is an economically important genus, little is known about Lessonia and in some areas even the number of species is unknown. Using different genetic markers I examined the phylogeny, phylogeography, and the connectivity of populations in Lessonia. Using the literature, species affiliations and nomenclatural problems have been investigated. Combining the sequences of three mitochondrial, one chloroplast and two nuclear markers, a supermatrix approach was used to investigate the phylogenetic relationship and the timing of speciation for all known Lessonia species. The Australasian Lessonia species form a clade within a paraphyletic grouping of South American species. Radiation in Lessonia occurred about 5 Mya at the beginning of the Pliocene and rapid radiation took place in Australasia 3.5 Mya. The data also revealed cryptic species within a L. variegata species complex. Further analysis within the Australasian clade, using mitochondrial (atp8-sp) and chloroplast (rbc-sp) markers and wider sampling (469 individuals from 57 sample sites) supported four cryptic species and revealed localized distribution for all Australasian lineages. Genetic breaks between Lessonia lineages corresponded well to known biogeographic regions and could be correlated to the geographic structure of New Zealand at the end of the Pliocene. The Cook Strait region was analysed more closely with newly developed microsatellite markers to test the influence of geographic breaks (Cook Strait and Palliser Bay) on the connectivity of populations. The results suggested that connectivity depends on the width of unsuitable habitat, and within inner Cook Strait it is facilitated by sometimes strong tidal flows that create turbulences and unique current patterns. The results implied that rafting is an important mean of dispersal. The study of the early literature on Lessonia supported the new lectotypification of L. flavicans but revealed that L. frutescens and possibly L. ovata (supported by images of rediscovered herbarium material) are synonymous to L. searlesiana and as the older epithets they should have priority. Suggestions have been made for the lectotypification of L. fuscescens and L. ovata. In general Lessonia shows non-overlapping distribution in Australasia but overlapping distribution in South America. Despite being a poor disperser, indicated by fine scale genetic structure, Lessonia is also able to connect populations over wide areas of unsuitable habitats.</p>

scholarly journals Phylogeny, Phylogeography and Population Connectivity of Lessonia (Phaeophyceae)

2021 ◽  
Author(s):  
◽  
Peter Martin
Keyword(s):  
New Zealand ◽  
South America ◽  
Cryptic Species ◽  
Population Connectivity ◽  
Disjunct Distribution ◽  
South American ◽  
Rocky Shores ◽  
South American Species ◽  
Cook Strait ◽  
Algal Genus

<p>The brown algal genus Lessonia is distributed in the Southern Hemisphere where it can form dominant kelp beds on the exposed rocky shores of New Zealand, South America and Tasmania. Its disjunct distribution within the West Wind Drift contrasts with the view that it is a poor disperser. Apart from studies in Chile, where it is an economically important genus, little is known about Lessonia and in some areas even the number of species is unknown. Using different genetic markers I examined the phylogeny, phylogeography, and the connectivity of populations in Lessonia. Using the literature, species affiliations and nomenclatural problems have been investigated. Combining the sequences of three mitochondrial, one chloroplast and two nuclear markers, a supermatrix approach was used to investigate the phylogenetic relationship and the timing of speciation for all known Lessonia species. The Australasian Lessonia species form a clade within a paraphyletic grouping of South American species. Radiation in Lessonia occurred about 5 Mya at the beginning of the Pliocene and rapid radiation took place in Australasia 3.5 Mya. The data also revealed cryptic species within a L. variegata species complex. Further analysis within the Australasian clade, using mitochondrial (atp8-sp) and chloroplast (rbc-sp) markers and wider sampling (469 individuals from 57 sample sites) supported four cryptic species and revealed localized distribution for all Australasian lineages. Genetic breaks between Lessonia lineages corresponded well to known biogeographic regions and could be correlated to the geographic structure of New Zealand at the end of the Pliocene. The Cook Strait region was analysed more closely with newly developed microsatellite markers to test the influence of geographic breaks (Cook Strait and Palliser Bay) on the connectivity of populations. The results suggested that connectivity depends on the width of unsuitable habitat, and within inner Cook Strait it is facilitated by sometimes strong tidal flows that create turbulences and unique current patterns. The results implied that rafting is an important mean of dispersal. The study of the early literature on Lessonia supported the new lectotypification of L. flavicans but revealed that L. frutescens and possibly L. ovata (supported by images of rediscovered herbarium material) are synonymous to L. searlesiana and as the older epithets they should have priority. Suggestions have been made for the lectotypification of L. fuscescens and L. ovata. In general Lessonia shows non-overlapping distribution in Australasia but overlapping distribution in South America. Despite being a poor disperser, indicated by fine scale genetic structure, Lessonia is also able to connect populations over wide areas of unsuitable habitats.</p>

Phylogenetic relationships within Dendroligotrichum and Polytrichadelphus (Polytrichaceae, Polytrichopsida) in the Palaeoaustral region. Studies in austral temperate rainforest bryophytes 32

2008 ◽  
Vol 21 (1) ◽  
pp. 39 ◽  
Author(s):  
Michael Stech ◽  
Tanja Pfeiffer ◽  
Wolfgang Frey
Keyword(s):  
New Zealand ◽  
South America ◽  
Phylogenetic Relationships ◽  
Sequence Data ◽  
Sequence Divergence ◽  
Trnl Intron ◽  
South American ◽  
South American Species ◽  
Southern South America ◽  
The One

Plastid trnT–F and atpB–rbcL spacer sequences as well as AFLP fingerprints are utilised to infer phylogenetic relationships of Dendroligotrichum and Polytrichadelphus taxa (Polytrichaceae) in the palaeoaustral region. Phylogenies based on DNA sequence data support the monophyly of each genus. Relationships within Dendroligotrichum remain ambiguous owing to low sequence divergence. AFLP fingerprinting, however, allows a clear distinction of all included Dendroligotrichum and Polytrichadelphus taxa at the species level. The morphological, distributional, ecological and molecular differences justify the recognition of the following three species in Dendroligotrichum: D. dendroides (Brid. ex Hedw.) Broth. and D. squamosum (Hook.f. & Wilson) Cardot in southern South America, as well as D. microdendron (Müll. Hal.) G.L.Sm. in New Zealand; and the following two species in Polytrichadelphus: P. magellanicus (Hedw.) Mitt. s.str. in southern South America and P. innovans (Müll. Hal.) A.Jäger in Australia and New Zealand. For Polytrichadelphus, the molecular topologies correspond with a vicariance scenario, with a basic split of taxa in the palaeoaustral region followed by migration of southern South American taxa northwards into the Neotropics. In Dendroligotrichum, substitutions and indels in the trnL intron and atpB–rbcL spacer are ambiguous in supporting either a basic split between the South American species and D. microdendron, similar to the one in Polytrichadelphus, or a trans-oceanic dispersal event between New Zealand and southern South America.

Driftwood on Heard Island

Polar Record ◽  
1989 ◽  
Vol 25 (154) ◽  
pp. 223-228 ◽  
Author(s):  
J. M. B. Smith ◽  
P. Rudall ◽  
P. L. Keage
Keyword(s):  
South America ◽  
South American ◽  
Long Distance Dispersal ◽  
South American Species ◽  
Long Distance ◽  
Heard Island

AbstractSamples from 73 pieces of non-structural driftwood on Heard Island (53°06′S, 73°30′E) were identified to genus or species. Thirty-one belonged to South American species of Nothofagus. The remainder, consisting mostly of conifers especially Picea and Larix, probably came from ships' cargoes. The assemblage is similar to those reported, from smaller samples, on other southern islands. Other items of flotsam, including fishing buoys and drift-cards, are also reported from Heard Island. The significance of driftwood transport from South America to the island in accounting for long-distance dispersal of terrestrial and intertidal organisms is discussed.

Paraboeremia yungensis sp. nov., a new fungal species isolated from Las Yungas, South America, with promising tyrosinase production potential

Phytotaxa ◽  
2021 ◽  
Vol 528 (3) ◽  
pp. 191-201
Author(s):  
MARIA PATRICIA PERALTA ◽  
JOAQUÍN ALIAGA ◽  
OSVALDO DANIEL DELGADO ◽  
JULIA INÉS FARIÑA ◽  
BERNARDO ERNESTO LECHNER
Keyword(s):  
South America ◽  
Rna Polymerase Ii ◽  
Single Gene ◽  
Large Subunit ◽  
Fungal Species ◽  
Malt Extract ◽  
South American ◽  
South American Species ◽  
Morphological Studies ◽  
Identification Approach

In the context of a bioprospection programme for tyrosinase/L-DOPA- and melanin-producing fungal strains for biotechnological purposes, a hyperproducer isolate was obtained from Las Yungas rainforest, a relevant biodiverse ecoregion in North-Western Argentina. The selected strain was preliminarily identified as Paraboeremia sp. This is, to the best of our knowledge, the first native reported species of this genus in South America. Single-gene and multi-locus analyses of the internal transcribed spacer nuclear ribosomal RNA gene region (ITS), partial large subunit 28S nrDNA region (LSU), RNA polymerase II region (RPB2) and partial β-tubulin gene (TUB2) alignments were carried out to define the phylogenetic identity of this strain. As part of a polyphasic identification approach, these results were combined with morphological studies of active cultures growing on malt extract, oatmeal and potato dextrose agar plates. Incubation was performed under diverse conditions to stimulate sporulation for the subsequent micromorphological analysis. Microphotographs of pycnidia and conidia were taken with a scanning electron microscope. Maximum likelihood and Bayesian Inference analyses supported the location of the strain within the genus Paraboeremia, whilst morphological features allowed distinguishing it from previously described species within this genus. Based on the results herein reported, the new South-American species Paraboeremia yungensis is described and proposed.

A molecular phylogeny of the circum-Antarctic Opiliones family Neopilionidae

2021 ◽  
Author(s):  
Gonzalo Giribet ◽  
Kate Sheridan ◽  
Caitlin M. Baker ◽  
Christina J. Painting ◽  
Gregory I. Holwell ◽  
...  
Keyword(s):  
New Zealand ◽  
South America ◽  
Morphological Study ◽  
18S Rrna ◽  
New Caledonia ◽  
Sister Group ◽  
28S Rrna ◽  
South American ◽  
Australian Species ◽  
The Family

The Opiliones family Neopilionidae is restricted to the terranes of the former temperate Gondwana: South America, Africa, Australia, New Caledonia and New Zealand. Despite decades of morphological study of this unique fauna, it has been difficult reconciling the classic species of the group (some described over a century ago) with recent cladistic morphological work and previous molecular work. Here we attempted to investigate the pattern and timing of diversification of Neopilionidae by sampling across the distribution range of the family and sequencing three markers commonly used in Sanger-based approaches (18S rRNA, 28S rRNA and cytochrome-c oxidase subunit I). We recovered a well-supported and stable clade including Ballarra (an Australian ballarrine) and the Enantiobuninae from South America, Australia, New Caledonia and New Zealand, but excluding Vibone (a ballarrine from South Africa). We further found a division between West and East Gondwana, with the South American Thrasychirus/Thrasychiroides always being sister group to an Australian–Zealandian (i.e. Australia + New Zealand + New Caledonia) clade. Resolution of the Australian–Zealandian taxa was analysis-dependent, but some analyses found Martensopsalis, from New Caledonia, as the sister group to an Australian–New Zealand clade. Likewise, the species from New Zealand formed a clade in some analyses, but Mangatangi often came out as a separate lineage from the remaining species. However, the Australian taxa never constituted a monophyletic group, with Ballarra always segregating from the remaining Australian species, which in turn constituted 1–3 clades, depending on the analysis. Our results identify several generic inconsistencies, including the possibility of Thrasychiroides nested within Thrasychirus, Forsteropsalis being paraphyletic with respect to Pantopsalis, and multiple lineages of Megalopsalis in Australia. In addition, the New Zealand Megalopsalis need generic reassignment: Megalopsalis triascuta will require its own genus and M. turneri is here transferred to Forsteropsalis, as Forsteropsalis turneri (Marples, 1944), comb. nov.

Taxonomic Revision of Euphrasia (Orobanchaceae) in South America

2021 ◽  
Vol 106 ◽  
pp. 392-423
Author(s):  
Ana Verónica Ortiz ◽  
Pablo Moroni ◽  
Fabiana Mirra ◽  
Rosa María Villanueva Espinoza ◽  
Nataly O'Leary
Keyword(s):  
South America ◽  
Native Species ◽  
Morphological Study ◽  
Taxonomic Revision ◽  
Herbarium Specimens ◽  
South American ◽  
South American Species ◽  
Arduous Task ◽  
First Time

Morphological boundaries between South American species of Euphrasia L. are controversial, rendering determination of specimens an arduous task. In this context, a comprehensive taxonomic revision of Euphrasia in South America is here provided for the first time. This study, based upon a classical morphological study of ca. 400 herbarium specimens, supports the recognition of eight species and one subspecies distributed in the Andean regions of Argentina, Bolivia, and Chile. From among native species, six belong to section Trifidae Benth. and one to the monotypic section Paradoxae Pugsley, endemic to Juan Fernández Islands; one adventive species, E. officinalis L., belongs to the section Euphrasia. The previously misunderstood presence of E. cockayniana Petrie is here untangled, and, consequently, the species is excluded from South America. A key to all Euphrasia taxa in South America, plus morphological descriptions, nomenclature items, geographical distribution and maps, habitat notes, illustrations, photographs, and discussion notes are included for the nine taxa. Eleven names are here synonymized, and lectotypes are designated for E. andicola Benth., E. debilis Wettst., E. flavicans Phil., E. intricata Phil., and E. philippii Wettst. Euphrasia andicola is reported for the first time for Argentina. This collaborative effort will represent a baseline for further investigations on Euphrasia in South America.

Comparative anatomy of the gut of the South American species of Amitermes, with description of two new species and an identification key based on soldiers and workers

Zootaxa ◽  
2020 ◽  
Vol 4751 (1) ◽  
pp. 75-104
Author(s):  
MAURICIO M. ROCHA ◽  
ELIANA M. CANCELLO
Keyword(s):  
New Species ◽  
South America ◽  
Geographic Distribution ◽  
Comparative Anatomy ◽  
Distribution Patterns ◽  
South American ◽  
The South ◽  
South American Species ◽  
Two New Species ◽  
First Time

In this contribution we present updates on the taxonomy and morphology of the South American species of Amitermes. Two new species are described: Amitermes bandeirai, sp. n., from Brazil, and Amitermes lilloi, sp. n., from Argentina. Amitermes nordestinus is a junior synonym of Amitermes aporema. The imago of A. aporema is described for the first time. Detailed comparative gut anatomy of the eight species is presented for the first time. The geographic distribution of Amitermes in South America is expanded and the distribution patterns of some species are discussed. 

scholarly journals Identification key to the Anopheles mosquitoes of South America (Diptera: Culicidae). III. Male genitalia

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Maria Anice Mureb Sallum ◽  
Ranulfo González Obando ◽  
Nancy Carrejo ◽  
Richard C. Wilkerson
Keyword(s):  
South America ◽  
Species Identification ◽  
Male Genitalia ◽  
Morphological Characters ◽  
Identification Key ◽  
Careful Examination ◽  
South American ◽  
Type Specimens ◽  
South American Species ◽  
Accurate Identification

Abstract Background Accurate identification of the species of Anopheles Meigen, 1818 requires careful examination of all life stages. However, morphological characters, especially those of the females and fourth-instar larvae, show some degree of polymorphism and overlap among members of species complexes, and sometimes even within progenies. Characters of the male genitalia are structural and allow accurate identification of the majority of species, excluding only those in the Albitarsis Complex. In this key, based on the morphology of the male genitalia, traditionally used important characters are exploited together with additional characters that allow robust identification of male Anopheles mosquitoes in South America. Methods Morphological characters of the male genitalia of South American species of the genus Anopheles were examined and employed to construct a comprehensive, illustrated identification key. For those species for which specimens were not available, illustrations were based on published illustrations. Photographs of key characters of the genitalia were obtained using a digital Canon Eos T3i attached to a light Diaplan Leitz microscope. The program Helicon Focus was used to build single in-focus images by stacking multiple images of the same structure. Results An illustrated key to South American species of Anopheles based on the morphology of the male genitalia is presented, together with a glossary of morphological terms. The male genitalia of type-specimens of previously poorly documented species were also examined and included in the key, e.g. Anopheles (Anopheles) tibiamaculatus (Neiva, 1906) which has a unique quadrangular-shaped aedeagus with an apical opening. Conclusions Male genitalia of South American species of Anopheles possess robust characters that can be exploited for accurate species identification. Distortion that can occur during the dissection and mounting process can obstruct accurate identification; this is most evident with inadvertent damage or destruction of unique features and interferes with correctly assigning shapes of the features of the ventral claspette. In some species, the shape, and anatomical details of the aedeagus also need to be examined for species identification. For members of the Myzorhynchella Series, both ventral and dorsal claspettes possess multiple characteristics that are herein used as reliable characters for species identification.

scholarly journals Brucellosis and tuberculosis in cattle in South America

2018 ◽  
Vol 55 (2) ◽  
pp. e141139
Author(s):  
José Soares Ferreira Neto
Keyword(s):  
New Zealand ◽  
South America ◽  
Epidemiological Data ◽  
Review Article ◽  
South American ◽  
Cattle Population ◽  
High Quality ◽  
The World ◽  
Meat Market ◽  
Epidemiological Situation

In general, European and North American countries, as well as Australia and New Zealand, have already eradicated or reached good levels of control of brucellosis and tuberculosis in cattle. In the rest of the world, however, the epidemiological situation of these two diseases is frequently poorly understood. In this review article, quantified data on these diseases in the South American countries are presented. Initially, the aspects that led the continent to host 25% of the world cattle population are presented, in addition to the aspects that placed the continent at a prominent position in the international meat market. Subsequently the continent was divided into three country groups, considering the size of the cattle population and how well the epidemiological situation of brucellosis and tuberculosis in cattle is quantified. It is argued that countries that do not generate high-quality quantitative epidemiological data on these diseases have serious limitations in outlining and managing control or eradication strategies. Thus, for successful outcomes, at least methodologies to estimate the prevalence of infected herds should be employed.

Hoplonannus australis sp. nov. (Hemiptera, Schizopteridae): amended diagnosis of the genus and first record from South America

Zootaxa ◽  
2019 ◽  
Vol 4568 (2) ◽  
pp. 394
Author(s):  
DIEGO DUTRA SILVEIRA ◽  
ALINE BARCELLOS ◽  
ALEXANDER KNYSHOV
Keyword(s):  
New Species ◽  
South America ◽  
Central America ◽  
First Record ◽  
South American ◽  
South American Species ◽  
The Right ◽  
New Diagnosis

Hoplonannus McAtee & Maloch, 1925 comprises three species described from Central America. Females of all these species are known only from brachypterous specimens. This paper describes the first South American species of the genus, Hoplonannus australis sp. nov. The new species differs from its congeners, in females, by the submacroptery, presence of ocelli and a basal bulge in the seventh sternite; in males, it differs by the presence of a process in the eighth tergite and the right paramere bifurcate apically, with branches subparallel. These traits entail a new diagnosis for the genus. 

Sign in / Sign up

Export Citation Format

Share Document