Distinctive morphological characteristics of Fucus guiryi (Fucales, Phaeophyceae) from Canary Islands, subtropical eastern Atlantic Ocean

Phytotaxa ◽  
2021 ◽  
Vol 521 (1) ◽  
pp. 15-26
Author(s):  
MARCOS A. RUIZ-MEDINA ◽  
ÁGUEDA M. GONZÁLEZ-RODRÍGUEZ ◽  
MARTA SANSÓN
Keyword(s):  
Canary Islands ◽  
Morphological Characteristics ◽  
Good Evidence ◽  
Brown Macroalgae ◽  
Southern Limit ◽  
Eastern Atlantic Ocean ◽  
Upper Intertidal ◽  
Eastern North Atlantic ◽  
Rocky Habitats ◽  
First Time

The brown macroalgae in the order Fucales include foundation species on rocky habitats of temperate regions. This work focused on Fucus guiryi, a recently described species segregated from F. spiralis in a molecular basis. It inhabits the upper intertidal zone from the eastern North Atlantic to the subtropical Canary Islands, where is considered its southern limit. We examined morphology and anatomy of vegetative and reproductive structures of F. guiryi from the Canary Islands. Several distinctive characteristics in habit existed between F. guiryi and other species of the genus distributed northwards, such as length and width of stipe and branches, number of branches, and morphology and number of receptacles. Anatomical features reported here for the first time exhibited subtle differences with temperate F. vesiculosus, F. spiralis and F. serratus. The morphology and arrangement of medulla, cortex and meristoderm were also distinctive for F. guiryi. Mucilage in cellular interstitial spaces constitutes good evidence that explains the presence of F. guiryi at its warmest distribution limit in the Canary Islands.

scholarly journals Further Advance of Gambierdiscus Species in the Canary Islands, with the First Report of Gambierdiscus belizeanus

Toxins ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 692 ◽  
Author(s):  
Àngels Tudó ◽  
Greta Gaiani ◽  
Maria Rey Varela ◽  
Takeshi Tsumuraya ◽  
Karl B. Andree ◽  
...  
Keyword(s):  
Canary Islands ◽  
Neuroblastoma Cell ◽  
Electrochemical Immunosensor ◽  
Benthic Dinoflagellates ◽  
Food Borne ◽  
Eastern Atlantic Ocean ◽  
North Eastern ◽  
Colorimetric Immunoassay ◽  
Ancient Times ◽  
First Time

Ciguatera Poisoning (CP) is a human food-borne poisoning that has been known since ancient times to be found mainly in tropical and subtropical areas, which occurs when fish or very rarely invertebrates contaminated with ciguatoxins (CTXs) are consumed. The genus of marine benthic dinoflagellates Gambierdiscus produces CTX precursors. The presence of Gambierdiscus species in a region is one indicator of CP risk. The Canary Islands (North Eastern Atlantic Ocean) is an area where CP cases have been reported since 2004. In the present study, samplings for Gambierdiscus cells were conducted in this area during 2016 and 2017. Gambierdiscus cells were isolated and identified as G. australes, G. excentricus, G. caribaeus, and G. belizeanus by molecular analysis. In this study, G. belizeanus is reported for the first time in the Canary Islands. Gambierdiscus isolates were cultured, and the CTX-like toxicity of forty-one strains was evaluated with the neuroblastoma cell-based assay (neuro-2a CBA). G. excentricus exhibited the highest CTX-like toxicity (9.5–2566.7 fg CTX1B equiv. cell−1) followed by G. australes (1.7–452.6.2 fg CTX1B equiv. cell−1). By contrast, the toxicity of G. belizeanus was low (5.6 fg CTX1B equiv. cell−1), and G. caribaeus did not exhibit CTX-like toxicity. In addition, for the G. belizeanus strain, the production of CTXs was evaluated with a colorimetric immunoassay and an electrochemical immunosensor resulting in G. belizeanus producing two types of CTX congeners (CTX1B and CTX3C series congeners) and can contribute to CP in the Canary Islands.

Cirripedia of the Canary Islands: distribution and ecological notes

2011 ◽  
Vol 92 (1) ◽  
pp. 129-141 ◽  
Author(s):  
J.A. González ◽  
L. Martín ◽  
R. Herrera ◽  
G. González-Lorenzo ◽  
F. Espino ◽  
...  
Keyword(s):  
Reference Material ◽  
Atlantic Ocean ◽  
Canary Islands ◽  
Eastern Atlantic Ocean ◽  
Xenobalanus Globicipitis ◽  
Voucher Specimens ◽  
Distribution And Ecology ◽  
First Time

The present paper is the first annotated account listing all species of Cirripedia: Thoracica recorded from the Canary Islands (eastern Atlantic Ocean) together with notes on their distribution and ecology. Voucher specimens have been deposited as reference material in the collection of the Instituto Canario de Ciencias Marinas. Seventeen species are listed and seven of them are recorded for the first time for the Canaries: Lepas hilli, Conchoderma virgatum, Xenobalanus globicipitis, Chthamalus sp. (cf. C. proteus), Acasta cyathus, Balanus trigonus and Perforatus perforatus.

scholarly journals Northernmost record of the pantropical portunid crab Cronius ruber in the eastern Atlantic (Canary Islands): natural range extension or human-mediated introduction?

2017 ◽  
Vol 81 (1) ◽  
pp. 81 ◽  
Author(s):  
José A. González ◽  
Raül Triay-Portella ◽  
Aitor Escribano ◽  
José A. Cuesta
Keyword(s):  
Canary Islands ◽  
Heavy Traffic ◽  
Morphological Characters ◽  
Range Extension ◽  
African Countries ◽  
Oil Platforms ◽  
Eastern Atlantic Ocean ◽  
Natural Range ◽  
First Time ◽  
Rocky Bottoms

The pantropical crab Cronius ruber (Lamarck, 1818) (Brachyura: Portunidae) is recorded for the first time from the Canary Islands. Previously known from off Cape Verde Islands and Senegal, this is the northernmost record of the species in the eastern Atlantic Ocean. Crabs have been caught by means of a collecting small trap for sampling in shallow waters, and then identified by both morphological characters and DNA barcoding (16S). Cytochrome c oxidase I partial sequence has been obtained for this species for the first time. This relatively large and very aggressive crab species seems to be rapidly occupying both hard substrates (sublittoral caves) and soft substrates (sand with seagrass meadow) adjacent to shallow rocky bottoms, at depths between 2 and 10 m, in the warm southern waters of Gran Canaria Island. The reasons for this species’ occurrence are discussed herein. Among them, natural range extension may be a consequence of tropicalization in the eastern Atlantic. Also, a human-mediated introduction could be based on the heavy traffic of ships (ballast waters or oil platforms) arriving at the Canary Islands from African countries and from Brazil in the last decade.

El español de la isla de La Graciosa desde una perspectiva prosódica

2021 ◽  
Vol 137 (2) ◽  
pp. 451-476
Author(s):  
Imelda Chaxiraxi Díaz Cabrera ◽  
Carolina Jorge Trujillo
Keyword(s):  
Canary Islands ◽  
Grammatical Morphology ◽  
Paper Format ◽  
New Generation ◽  
First Time ◽  
The Town

Abstract Manuel Alvar published the only linguistic work known on Spanish from the island of La Graciosa (Canary Islands) in 1965, focused on the town of Caleta del Sebo, to document, in the field of Linguistic geography, the ALEICan (Linguistic and ethnographic atlas of the Canary Islands [1975–1978]). Alvar’s studies used to cover the lexical, grammatical (morphology and syntax) and phonetic levels of the segmental type, but he did not consider prosodic aspects of speech which would later be incorporated into a new generation of atlases, which would go from paper format to multimedia. As the main exponent, the AMPER project (Atlas Multimédia Prosodique de l’Espace Roman) was created in 2001 and, within its framework, we intend to describe the melodic characteristics of a group of sentences emitted by a man and a woman from Caleta del Sebo, completing thus the study started by Alvar fifty-five years ago. In this way, the results will show for the first time if there is a prosodic proximity between the eighth island and the seven main islands, which have been widely described in previous works both in formal and in informal speech.

scholarly journals A review of the Sarcophaga (Heteronychia) (Diptera: Sarcophagidae) of Sardinia

Zootaxa ◽  
2009 ◽  
Vol 2318 (1) ◽  
pp. 566-588 ◽  
Author(s):  
DANIEL WHITMORE
Keyword(s):  
Canary Islands ◽  
North Africa ◽  
Junior Synonym ◽  
Arthropod Diversity ◽  
Italian Regions ◽  
Males And Females ◽  
First Time

An account is given of the species of Sarcophaga Meigen, 1826 subgenus Heteronychia Brauer & Bergenstamm, 1889 known from the island of Sardinia (Italy). Most of the nearly 1,400 specimens examined were collected in the SW part of the island during 2003–2006 as part of a project investigating the arthropod diversity of the Monti Marganai and Montimannu areas (respectively Carbonia-Iglesias and Medio Campidano provinces). The study resulted in the finding of eight species of Heteronychia, six of which are recorded from Sardinia for the first time. Sarcophaga (Heteronychia) penicillata Villeneuve, 1907, previously mentioned in the literature, is excluded from the fauna of the island. Sarcophaga (Heteronychia) thirionae (Lehrer, 1976) is recorded for the first time from Europe and North Africa (Algeria). One species, Sarcophaga (Heteronychia) gabrielei sp. nov., from various sites in the limestone massif of Marganai, is described as new. Previously unpublished records from other Italian regions and from other countries (Algeria, Canary Islands, Greece) are also given for several species. Sarcophaga (Heteronychia) schnabli Villeneuve, 1911 is recognized as a junior synonym of S. (H.) consanguinea Rondani, 1860 syn. nov. The possible synanthropy of Sarcophaga (Heteronychia) pandellei (Rohdendorf, 1937) is briefly discussed. A key to males and females of all known Sardinian and Corsican species of Sarcophaga (Heteronychia) is provided.

The lithobiomorph centipedes of the Canary Islands (Chilopoda)

1992 ◽  
Vol 23 (1) ◽  
pp. 1-9 ◽  
Author(s):  
H. Enghoff ◽  
E.H. Eason
Keyword(s):  
Canary Islands ◽  
First Time ◽  
Eleven Species

AbstractEleven species of Lithobius and three of Lamyctes are recorded from the Canary Islands, Lithobius comsimilis Eason, sp. n., L. canariensis Eason, sp. n. and Lamyctes mauriesi Demange, 1981, for the first time. These three species are described. Several species are recorded as new for one or more island. A key is provided for the identification of all the species recorded.

Découverte d’une nouvelle population de Rhithrogena delphinensis Sowa & Degrange, 1987, dans le massif des Arves, et compléments à la description de la larve (Ephemeroptera, Heptageniidae)

2021 ◽  
Vol 126 (4) ◽  
pp. 401-420
Author(s):  
Bertrand Launay ◽  
Julien Barnasson ◽  
Juliette Becquet ◽  
Michel Brulin ◽  
Sophie Cauvy-Fraunie ◽  
...  
Keyword(s):  
Drainage Basin ◽  
Morphological Characteristics ◽  
Western Alps ◽  
Coi Gene ◽  
Morphological Description ◽  
Base Pairs ◽  
Northern Flank ◽  
Ecological Requirements ◽  
First Time ◽  
Existing Data

Discovery of a new population of Rhithrogena delphinensis Sowa & Degrange, 1987, in the Arves Massif, and additions to the morphological description of the larva (Ephemeroptera, Heptageniidae). Rhithrogena delphinensis, described originally on the basis of four larvae from the Western Alps, south of the Arves Massif and from the northern flank of the Ecrins Massif, had not been captured again since 1986. Here, we report the discovery of a new population from river Arvan, whose drainage basin is located between the Grandes Rousses Massif and the northern flank of the Arves Massif. This newly discovered population seems abundant in numbers, and reveals the particular ecological requirements of the species as well as its dependence on glacier fed or nival streams. The morphological characteristics of the larvae are described in detail, and illustrated by photographs. The variability of some of the proposed identification criteria is discussed, and a key to the identification of the Rhithrogena species from the alpestris group of the Western Alps, to which R. delphinensis belongs, is provided. Finally, a portion of 658 base pairs of the COI gene of R. delphinensis is sequenced for the first time and compared to already existing data on the alpestris group in the Western Alps.

Coronary artery myogenic response in a genetic model of hypertrophic cardiomyopathy

2002 ◽  
Vol 283 (6) ◽  
pp. H2244-H2249 ◽  
Author(s):  
Henrik H. Petersen ◽  
Jonathan Choy ◽  
Brian Stauffer ◽  
Farzad Moien-Afshari ◽  
Christian Aalkjaer ◽  
...  
Keyword(s):  
Transgenic Mouse ◽  
Genetic Model ◽  
Morphological Characteristics ◽  
Myogenic Tone ◽  
Chain Gene ◽  
Myogenic Response ◽  
Cardiac Phenotype ◽  
First Time ◽  
Pressure Myograph ◽  
Intravascular Pressure

Hypertrophic cardiac myopathy (HCM) is the leading cause of mortality in young athletes. Abnormalities in small intramural coronary arteries have been observed at autopsy in such subjects. The walls of these intramural vessels, especially in the ventricular septum, are thickened, and the lumen frequently appears narrowed. Whether these morphological characteristics have functional correlates is unknown. We studied coronary myogenic tone in a transgenic mouse model of HCM that has mutations in the cardiac α-myosin heavy chain gene. This transgenic mouse has a cardiac phenotype that resembles that occurring in humans. We examined the possible vascular contributions to the pathology of HCM. Septal arteries from 3- and 11-mo-old wild-type (WT) and transgenic (TG) mice were studied on a pressure myograph. The myogenic response to increased intravascular pressure in older animals was significantly reduced [maximal constriction: 32 ± 4% (TG) and 46 ± 4% (WT), P < 0.05]. After inhibition of endothelin receptors with bosentan, both WT and TG mice had similar increases in myogenic constriction. The sensitivity to exogenous endothelin was significantly reduced in TG mice, suggesting that the reduced myogenic constriction in HCM was due to reduced receptor sensitivity. In conclusion, we show for the first time that 1) myogenic tone in the coronary septal artery of the mouse is regulated by a basal release of endothelin, and 2) pressure-induced myogenic activation is attenuated in HCM, possibly consequent to a reduction in endothelin responsiveness. The associated reduction in coronary vasodilatory reserve may increase susceptibility to ischemia and arrhythmias.

scholarly journals Reproduction and population structure of the sea cucumber Holothuria tubulosa in the Dardanelles Strait, Turkey

2015 ◽  
Vol 17 (1) ◽  
pp. 47 ◽  
Author(s):  
H. DERELİ ◽  
S. TÜRK ÇULHA ◽  
M. ÇULHA ◽  
B. H. ÖZALP ◽  
A. A. TEKİNAY
Keyword(s):  
Population Density ◽  
Gonadosomatic Index ◽  
Morphological Characteristics ◽  
Environmental Parameters ◽  
Population Characteristics ◽  
High Positive Correlation ◽  
Mediterranean Populations ◽  
Reproductive Patterns ◽  
First Time ◽  
The Relationship

In this study, Holothuria tubulosa Gmelin 1791 was investigated from April 2013 to March 2014 in the Dardanelles Strait, to outline the morphological characteristics, reproductive patterns and the relationship between population characteristics and environmental parameters. Between 15 and 30 individuals of this species were sampled monthly from three stations. There was a negative allometry between length and weight, being gutted weight the most reliable measurement for this species. Reproductive patterns of the species were identified the first time for Turkish coasts. By macroscopic examination of the gonads, smallest sizes (gutted length) were measured as 8.4 and 8.1 cm for female and male, respectively. Sex ratio was calculated as 1: 1.1 with differences between seasons. The reproduction of sea cucumbers occurred between August and September after Gonadosomatic Index (GSI) values reached their maximum in July. The species was found down to 10 m depth with a population density of 0.21 / m2, which was rather low compared to previously reported values for Mediterranean populations of this species. There was a high positive correlation between population density and GSI of the species. The highest population density was observed where the largest sea grass meadows are found.

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