Phylogenetic position and description of Rhytidocystis cyamus sp. n. (Apicomplexa, Rhytidocystidae): a novel intestinal parasite of the north-eastern Pacific ‘stink worm’ (Polychaeta, Opheliidae, Travisia pupa)

2009 ◽  
Vol 39 (4) ◽  
pp. 227-234 ◽  
Author(s):  
Sonja Rueckert ◽  
Brian S. Leander
Keyword(s):  
Intestinal Parasite ◽  
Eastern Pacific ◽  
Phylogenetic Position ◽  
The North ◽  
North Eastern

scholarly journals Morphological and molecular characterization of a new species of Atlantic stalked barnacle (Scalpelliformes: Pollicipedidae) from the Cape Verde Islands

2011 ◽  
Vol 91 (7) ◽  
pp. 1537-1545 ◽  
Author(s):  
Javier Quinteiro ◽  
Jorge Rodríguez-Castro ◽  
Pedro López ◽  
Luis F. López-Jurado ◽  
Nieves González-Henríquez ◽  
...  
Keyword(s):  
New Species ◽  
Charles Darwin ◽  
Taxonomic Status ◽  
Molecular Data ◽  
Cape Verde ◽  
Eastern Pacific ◽  
Cape Verde Islands ◽  
The North ◽  
North Eastern ◽  
Central Eastern

The taxonomy of pedunculate cirripedes belonging to the genus Pollicipes has essentially remained unchanged since Charles Darwin described them in his exhaustive work on the Cirripedia. This genus includes three species of stalked barnacles: Pollicipes pollicipes in the north-eastern Atlantic, P. polymerus in the north-eastern Pacific and P. elegans in the central-eastern Pacific. However, a population genetics analysis of P. pollicipes suggested the presence of a putative cryptic species collected from the Cape Verde Islands in the central-eastern Atlantic. This study examines the morphology of these genetically divergent specimens and compares them with that of representative Atlantic samples of the biogeographically closely related P. pollicipes and with the poorly described P. elegans. Molecular data, including mitochondrial COX1 and nuclear ribosomal interspaces sequences, were obtained for all species of the genus Pollicipes. Morphological distinctiveness, diagnostic characters, congruent divergence level and monophyletic clustering, at both nuclear and mitochondrial loci support the taxonomic status of this new species, Pollicipes darwini.

scholarly journals Beta Diversity of Demersal Fish Assemblages in the North-Eastern Pacific: Interactions of Latitude and Depth

PLoS ONE ◽  
2013 ◽  
Vol 8 (3) ◽  
pp. e57918 ◽  
Author(s):  
Marti J. Anderson ◽  
Nick Tolimieri ◽  
Russell B. Millar
Keyword(s):  
Beta Diversity ◽  
Fish Assemblages ◽  
Demersal Fish ◽  
Eastern Pacific ◽  
The North ◽  
North Eastern

Stratospheric cirrus clouds related to deep convection over North America observed by satellite measurements

2021 ◽  
Author(s):  
Ling Zou ◽  
Lars Hoffmann ◽  
Sabine Griessbach ◽  
Lunche Wang
Keyword(s):  
North America ◽  
Formation Mechanism ◽  
Great Plains ◽  
Gravity Waves ◽  
North Atlantic ◽  
Deep Convection ◽  
Eastern Pacific ◽  
Western Canada ◽  
The North ◽  
North Eastern

<p>Cirrus clouds in the stratosphere (SCCs) regulate the water vapor budget in the stratosphere, impact the stratosphere and tropopshere exchange, and affect the surface energy balance. But the knowledge of its occurrence and formation mechanism is limited, especially in middle and high latitudes. In this study, we aim to assess the occurrence frequencies of SCC over North America based on The Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) instrument during the years 2006 to 2018. Possible driving forces such as deep convection are assessed based on Atmospheric Infrared Sounder (AIRS) observations during the same time. </p><p>Results show that at nighttime, SCCs are most frequently observed during the thunderstorm season over the Great Plains from May to August (MJJA) with maximum occurrence frequency of 6.2%. During the months from November to February (NDJF), the highest SCCs occurrence frequencies are 5.5% over the North-Eastern Pacific, western Canada and 4.4% over the western North Atlantic. Occurrence frequencies of deep convection and strong storm systems from AIRS show similar hotspots like the SCCs, with highest occurrence frequencies being observed over the Great Plains in MJJA (4.4%) and over the North-Eastern Pacific, western Canada and the western North Atlantic in NDJF (~2.5%). Both, seasonal patterns and daily time series of SCCs and deep convection show a high degree of spatial and temporal correlation. As further analysis indicates that the maximum fraction of SCCs generated by deep convection is 74% over the Great Plains in MJJA and about 50% over the western North Atlantic, the North-Eastern Pacific and western Canada in NDJF, we conclude that, locally and regionally, deep convection is a leading factor for the formation of SCCs over North America. Other studies stressed the relevance of isentropic transport, double tropopause events, or gravity waves for the formation of SCCs. </p><p>In this study, we also analyzed the impact of gravity waves as a secondary formation mechanism for SCCs, as the Great Plains is a well-known hotspot for stratospheric gravity waves. In case of SCCs that are not directly linked to deep convection, we found that stratospheric gravity wave observations correlate in as much as 30% of the cases over the Great Plains in MJJA, about 50% over the North-Eastern Pacific, western Canada and maximally 90% over eastern Canada and the north-west Atlantic in NDJF. </p><p>Our results provide better understanding of the physical processes and climate variability related to SCCs and will be of interest for modelers as SCC sources such as deep convection and gravity waves are small-scale processes that are difficult to represent in global general circulation models. </p>

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