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First record of the rare crab Asthenognathus atlanticus Monod, 1933 (Crustacea: Brachyura: Varunidae) in the North Sea

Faasse Marco, Gheerardyn Hendrik, Witbaard Rob, Cuperus Joël

Oceanological and Hydrobiological Studies

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2021

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Vol. 50, No. 3

352--358

EN

Several species new to the area were collected while monitoring Dutch marine waters using a dredge. The varunid crab Asthenognathus atlanticus Monod, 1933 was recorded for the first time in the North Sea. Until 2008, this relatively rare crab was known from the west coast of Africa and the western Mediterranean to northern Brittany in the north. In recent years, its distribution range has expanded, as indicated by records from the Bay of the Seine and the area around Dieppe-Le Tréport. Our finding from Brown Bank (southern North Sea) indicates a further, northward expansion of its distribution range. We list the hosts with which the crab is associated. Earlier arguments for climate change as an explanation for the northward range expansion are supported.

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First record of Prestauroneis tumida Levkov and accompanying species in Poland

Rakowska B., Szczepocka E., Żelazna-Wieczorek J., Olszyński R. M.

Oceanological and Hydrobiological Studies

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2017

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Vol. 46, No. 1

30--37

EN

The paper presents morphological and ecological characteristics of Prestauroneis tumida Levkov recorded for the first time in Poland. The diatom Prestauroneis tumida Levkov was found in the microbenthos of the Czarna Staszowska River (left tributary of the Vistula River, south-eastern Poland). This diatom species was present in the upper section of the river (sampling sites: 1 – Drogowle, 2 – Raków) where saprobic state varied from oligosaprobic to beta-mesosaprobic. Dimensions of the valve were as follows: length 30-44 µm, width 8-11 µm and 13-16 striae in 10 µm. Our research updates the morphological diversity data such as measurements of valves in terms of width and the number of striae. The accompanying species of Prestauroneis tumida belonged to the group of good water quality indicators, from oligo- to mesosaprobic ones. Some of the identified species were indicators of alkaline, calcium-rich waters.

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Benthic diatoms of the Vrla River (Serbia) and their application in the water ecological status assessment

Jakovljević O., Popović S., Živić I., Stojanović K., Krizmanić J.

Oceanological and Hydrobiological Studies

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2016

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Vol. 45, No. 3

304--315

EN

Epilithic diatoms from the Vrla River (Serbia) have been used to assess the ecological status of water. A total of 227 diatom taxa belonging to 50 genera were identified in the Vrla River during six research seasons with 13 dominant species recorded. Gomphonema (30 species), Navicula (28) and Nitzschia (26) were the most species-rich genera, followed by Pinnularia (12) and Encyonema (11). One taxa was recorded as new to Serbia – Geissleria acceptata. CCA grouped the diatom taxa into three main groups. The first group included taxa found at most of the sampling sites, the second group involved diatom taxa significantly positively correlated with the oxygen, while the third group showed positive correlation with temperature. RDA showed that some diatom taxa, including: Cocconeis placentula var. placentula, C. placentula var. lineata, C. pseudolineata and Mayamaea atomus var. permitis, are significantly positively correlated with temperature, while others, for example Achnanthidium minutissimum, Hannaea arcus, Nitzschia pura are mostly correlated with total phosphorus, alkalinity and water hardness. The ecological status of the Vrla River ranged from moderate, good to high. It was shown that according to the diatom indices, the ecological status of water downstream and upstream of a trout fish pond was slightly different.

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The first record of Litarachna duboscqi Walter, 1925 (Acari, Pontarachnidae) outside the Mediterranean Sea

Zawal A., Pešić V.

Oceanological and Hydrobiological Studies

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2015

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Vol. 44, No. 3

426--429

EN

A single female of Litarachna duboscqi Walter, 1925 was collected on the coast of the island of Tenerife (Canary Islands) extending the currently known distribution of this species by more than 2000 km southwestward into the eastern Atlantic.

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New localities of rare species Kobayasiella okadae (Skvortzov) Lange-Bert. and K. tintinnus Buczkó, Wojtal & Jahn in Europe : morphological and ecological characteristics

Noga T., Stanek-Tarkowska J., Peszek Ł., Pajączek A, Kochman N, Zubel R.

Oceanological and Hydrobiological Studies

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2014

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Vol. 43, No. 4

374--380

EN

The aim of the present work conducted in the area of Międzyrzeki Strict Nature Reserve in the Roztocze National Park was to show new sites of rare and species new to Poland from the Kobayasiella genus (K. okadae (Skvortzov) Lange-Bert., K. tintinnus Buczkó, Wojtal & Jahn) with regard to morphological and ecological characteristics. Chemical parameters show that investigated habitats are poor and oligotrophic with a low content of chlorides, sulfates and nitrates. K. okadae, K. subtilissima (Cleve) Lange-Bert. and K. tintinnus were found in the studied area. The authors suggest the use of synonym Navicula hoeflerii Cholnoky for the Kobayasiella okadae. LM and SEM images were used in the analysis of the material.