scholarly journals Redescription of Echinoderes levanderi Karling, 1954 (Kinorhyncha: Cyclorhagida) – a kinorhynch tolerant to very low salinities

2018 ◽  
Author(s):  
Martin V. Sørensen
Keyword(s):  
Sexual Dimorphism ◽  
Bottom Water ◽  
New Records ◽  
Water Salinity ◽  
Distributional Range ◽  
Sieve Plates ◽  
Bothnian Bay

The kinorhynch species Echinoderes levanderi Karling, 1954 is redescribed. The species can now be recognized by the presence of spines in middorsal positions on segments 4–8, and in lateroventral positions on segments 6–9, with lateroventral spines on segment 9 showing sexual dimorphism; tubes in subdorsal and ventrolateral positions on segment 2, in sublateral positions on segments 4 and 8, in lateroventral positions on segment 5, and in laterodorsal positions on segment 10. Furthermore, the enlarged sieve plates on segment 9 make the species highly characteristic. New records of the species extend its distributional range into the Bothnian Bay where the bottom water salinity drops below 5 ppt, which is the lowest salinity recorded for a habitat with kinorhynchs.

scholarly journals Large variations in iron input to an oligotrophic Baltic Sea estuary: impact on sedimentary phosphorus burial

2018 ◽  
Vol 15 (22) ◽  
pp. 6979-6996 ◽  
Author(s):  
Wytze K. Lenstra ◽  
Matthias Egger ◽  
Niels A. G. M. van Helmond ◽  
Emma Kritzberg ◽  
Daniel J. Conley ◽  
...  
Keyword(s):  
Organic Matter ◽  
Baltic Sea ◽  
Reactive Transport ◽  
Bottom Water ◽  
Transport Model ◽  
Coastal Sediments ◽  
Estuarine Sediments ◽  
Water Salinity ◽  
The Baltic Sea ◽  
The Baltic

Abstract. Estuarine sediments are key sites for removal of phosphorus (P) from rivers and the open sea. Vivianite, an Fe(II)-P mineral, can act as a major sink for P in Fe-rich coastal sediments. In this study, we investigate the burial of P in the Öre Estuary in the northern Baltic Sea. We find much higher rates of P burial at our five study sites (up to ∼0.145 molm-2yr-1) when compared to more southern coastal areas in the Baltic Sea with similar rates of sedimentation. Detailed study of the sediment P forms at our site with the highest rate of sedimentation reveals a major role for P associated with Fe and the presence of vivianite crystals below the sulfate methane transition zone. By applying a reactive transport model to sediment and porewater profiles for this site, we show that vivianite may account for up to ∼40 % of total P burial. With the model, we demonstrate that vivianite formation is promoted in sediments with a low bottom water salinity and high rates of sedimentation and Fe oxide input. While high rates of organic matter input are also required, there is an optimum rate above which vivianite formation declines. Distinct enrichments in sediment Fe and sulfur at depth in the sediment are attributed to short periods of enhanced input of riverine Fe and organic matter. These periods of enhanced input are linked to variations in rainfall on land and follow dry periods. Most of the P associated with the Fe in the sediment is likely imported from the adjacent eutrophic Baltic Proper. Our work demonstrates that variations in land-to-sea transfer of Fe may act as a key control on burial of P in coastal sediments. Ongoing climate change is expected to lead to a decrease in bottom water salinity and contribute to continued high inputs of Fe oxides from land, further promoting P burial as vivianite in the coastal zone of the northern Baltic Sea. This may enhance the role of this oligotrophic area as a sink for P imported from eutrophic parts of the Baltic Sea.

scholarly journals Ventilation of the Northern Baltic Sea

2019 ◽  
Author(s):  
Thomas Neumann ◽  
Herbert Siegel ◽  
Matthias Moros ◽  
Monika Gerth ◽  
Madline Kniebusch ◽  
...  
Keyword(s):  
Sea Ice ◽  
Baltic Sea ◽  
Deep Water ◽  
Bottom Water ◽  
Ice Core ◽  
Winter Season ◽  
The Baltic Sea ◽  
The Baltic ◽  
Bothnian Bay ◽  
Bothnian Sea

Abstract. The Baltic Sea is a semi-enclosed, brackish water sea in northern Europe. The deep basins of the central Baltic Sea regularly show hypoxic conditions. In contrast, the northern parts of the Baltic Sea, the Bothnian Sea and Bay, are well oxygenated. Lateral inflows or a ventilation due to convection are possible mechanisms for high oxygen concentrations in the deep water of the northern Baltic Sea. Owing to the high latitudes of the northern Baltic, this region is regularly covered by sea ice during the winter season. In March 2017, the RV Maria S. Merian was for two days in the Bothnian Bay collecting ice core samples, brine water, and CTD profiles. The bulk sea ice salinity was on average 0.6 g/kg and in brine samples, a salinity of 11.5 g/kg and 17.8 g/kg have been measured. At one station, the CTD profiles indicated a recent ventilation event of the deep water. A water mass analysis showed that the ventilation is most probably due to mixing of Bothnian Sea and Bothnian Bay surface water which results in sufficient dense water able to replace older bottom water. However, the high salinity of brine provides the potential for forming dense bottom water masses as well.

scholarly journals Reconstruction of Pacific Ocean bottom water salinity during the Last Glacial Maximum

2014 ◽  
Vol 41 (8) ◽  
pp. 2914-2920 ◽  
Author(s):  
Tania Lado Insua ◽  
Arthur J. Spivack ◽  
Dennis Graham ◽  
Steven D'Hondt ◽  
Kathryn Moran
Keyword(s):  
Pacific Ocean ◽  
Last Glacial Maximum ◽  
Bottom Water ◽  
Glacial Maximum ◽  
Water Salinity ◽  
Ocean Bottom ◽  
Last Glacial ◽  
The Last Glacial Maximum ◽  
The Last Glacial

scholarly journals Ventilation of the northern Baltic Sea

Ocean Science ◽  
2020 ◽  
Vol 16 (4) ◽  
pp. 767-780 ◽  
Author(s):  
Thomas Neumann ◽  
Herbert Siegel ◽  
Matthias Moros ◽  
Monika Gerth ◽  
Madline Kniebusch ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Bottom Water ◽  
Model Simulation ◽  
Ice Core ◽  
The Baltic Sea ◽  
Hypoxic Conditions ◽  
The Baltic ◽  
Bothnian Bay ◽  
Temperature Depth ◽  
Bothnian Sea

Abstract. The Baltic Sea is a semi-enclosed, brackish water sea in northern Europe. The deep basins of the central Baltic Sea regularly show hypoxic conditions. In contrast, the northern parts of the Baltic Sea, the Bothnian Sea and Bothnian Bay, are well oxygenated. Lateral inflows or a ventilation due to convection are possible mechanisms for high oxygen concentrations in the deep water of the northern Baltic Sea. In March 2017, conductivity–temperature–depth (CTD) profiles and bottle samples, ice core samples, and brine were collected in the Bothnian Bay. In addition to hydrographic standard parameters, light absorption has been measured in all samples. A complementary numerical model simulation provides quantitative estimates of the spread of newly formed bottom water. The model uses passive and age tracers to identify and trace different water masses. Observations indicate a recent ventilation of the deep bottom water at one of the observed stations. The analysis of observations and model simulations shows that the Bothnian Bay is ventilated by dense water formed due to mixing of Bothnian Sea and Bothnian Bay surface water initializing lateral inflows. The observations show the beginning of the inflow and the model simulation demonstrates the further northward spreading of bottom water. These events occur during wintertime when the water temperature is low. Brine rejected during ice formation barely contributes to dense bottom water.

Revision of the tribe Hydarini in the Oriental region (Hemiptera, Heteroptera: Coreidae)

1993 ◽  
Vol 24 (4) ◽  
pp. 383-390 ◽  
Author(s):  
H. Brailovsky
Keyword(s):  
New Records ◽  
The South ◽  
Oriental Region ◽  
The North ◽  
Distributional Range

AbstractThe tribe Hydarini StÅl (Coreidae) from the Oriental region is revised: seven species in four genera are recognized, of which Hydarella chiangdaoensis from Thailand and Laos and H. sundae from the Lesser Sunda Islands are newly described. A key to the known taxa is given and new records are added which extend the distributional range of the Hydarini from China in the north to the Lesser Sunda Islands in the south.

scholarly journals New records of Amphisbaena medemi Gans & Mathers, 1977 (Squamata: Amphisbaenidae) from the Caribbean region of northern Colombia

Check List ◽  
2015 ◽  
Vol 11 (1) ◽  
pp. 1526
Author(s):  
Fabio Leonardo Meza-Joya
Keyword(s):  
Tropical Forest ◽  
Sierra Nevada ◽  
New Records ◽  
Transitional Zone ◽  
Distribution Range ◽  
Caribbean Region ◽  
Distributional Range ◽  
The Caribbean ◽  
Detailed Picture

This report extends the distribution range of Amphisbaena medemi to the southeast foothills of the Sierra Nevada de Santa Marta and western foothills of the Serranía del Perijá in La Guajira department, Colombia. These records offer a more detailed picture of the species’ distributional range along the Caribbean region of Colombia and represent the first observation of the species in a transitional zone between dry and moist tropical forest.

A remarkable new species of Multumbo showing sexual dimorphism, with the transfer of Multumbo and Piassagera to the Hernandariinae  (Opiliones, Gonyleptidae)

Zootaxa ◽  
2007 ◽  
Vol 1558 (1) ◽  
pp. 29-37 ◽  
Author(s):  
MARCIO B. DASILVA ◽  
ADRIANO B. KURY
Keyword(s):  
New Species ◽  
Sexual Dimorphism ◽  
Rio De Janeiro ◽  
Type Species ◽  
New Records ◽  
Southeastern Brazil ◽  
Monotypic Genus ◽  
Complex Scenario ◽  
A New Species ◽  
Janeiro State

A new species of Multumbo Roewer, 1927 (Gonyleptidae: Hernandariinae), M. dimorphicus sp. nov., is described from Rio de Janeiro state, southeastern Brazil. It presents sexual dimorphism in leg IV, contrasting remarkably with the type species of the hitherto monotypic genus Multumbo and the closest genera (Piassagera Roewer, 1928 and Pseudotrogulus Roewer, 1932), which were all thought to have lost this dimorphism. The presence of sexual dimorphism in M. dimorphicus implies a complex scenario of loss or reversal of this character. New records are given of type species of genus, Multumbo terrenus Roewer, 1913, for which a lectotype is designated. New diagnoses are provided for Hernandariinae and Multumbo. Multumbo and Piassagera are transferred from the Gonyleptinae to the Hernandariinae.Uma nova espécie de Multumbo Roewer, 1927, M. dimorphicus sp. nov., é descrita do estado do Rio de Janeiro. Ela apresenta dimorfismo sexual na perna IV, condição em notável contraste com a espécie-tipo do até então gênero monotípico Multumbo e com os gêneros mais relacionados, Piassagera Roewer, 1928 e Pseudotrogulus Roewer, 1932, nos quais esse dimorfismo era considerado como perdido. A presença de dimorfismo sexual em M. dimorphicus sugere um complexo cenário de perda ou reversão desse dimorfismo. Também foram incluídos novos registros da espécie-tipo do gênero, Multumbo terrenus Roewer, 1913, e um lectótipo é designado. Novas diagnoses para Hernandariinae and Multumbo são apresentadas. Multumbo e Piassagera são aqui transferidos de Gonyleptinae para Hernandariinae.

scholarly journals External and intestinal parasites of the Austral thrush Turdus falcklandii (Aves, Turdidae) in central Chile

2019 ◽  
Vol 28 (3) ◽  
pp. 432-442
Author(s):  
Sebastián Llanos-Soto ◽  
Mabel Córdoba ◽  
Lucila Moreno ◽  
John Mike Kinsella ◽  
Sergey Mironov ◽  
...  
Keyword(s):  
New Records ◽  
Intestinal Parasites ◽  
Central Chile ◽  
Distributional Range ◽  
Plagiorhynchus Cylindraceus

Abstract A total of thirty Austral thrushes Turdus falcklandii Quoy & Gaimard, 1824 (Turdidae) carcasses were brought to the Departamento de Ciencia Animal, Facultad de Ciencias Veterinarias, Universidad de Concepción, to be examined for ecto- and endoparasites. Ectoparasites were found on 20% (6/30) of the thrushes and belonged to species Brueelia magellanica Cichino, 1986 (Phthiraptera), Menacanthus eurysternus Burmeister, 1838 (Phthiraptera) and Tyrannidectes falcklandicus Mironov & González-Acuña, 2011 (Acari). Endoparasites were isolated from 26.6% (8/30) of the birds and identified as Lueheia inscripta Westrumb, 1821 (Acanthocephala), Plagiorhynchus cylindraceus Goeze, 1782 (Acanthocephala), Wardium sp. sensu Mayhew, 1925 (Cestoda), Dilepis undula (Cestoda) Schrank, 1788, and Zonorchis sp. (sensu Travassos, 1944) (Trematoda). To our knowledge, all endoparasites collected in this study are new records in T. falcklandii and expand their distributional range to Chile.

scholarly journals New records and an updated map of distribution of Micrurus camilae Renjifo & Lundberg, 2003 (Elapidae) for Colombia

Check List ◽  
2019 ◽  
Vol 15 (3) ◽  
pp. 465-469
Author(s):  
Elson Meneses-Pelayo ◽  
Diana Caballero
Keyword(s):  
New Record ◽  
New Records ◽  
Color Variation ◽  
Coral Snake ◽  
Distributional Range ◽  
Nearest Point ◽  
Straight Line ◽  
First Time

Camila’s Coral Snake, Micrurus camilae Renjifo & Lundberg, 2003, is known only by 3 collected specimens. In this work, we report for the first time the presence of M. camilae in the middle Magdalena Valley, and we add data about color variation in the species. The new record extends the distributional range of M. camilae by nearly 200 km in a straight line from Vereda El Rayo, Tarazá, Antioquia, which is the nearest point previously reported.

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