Najas marina subsp. intermedia (WOLFG. ex GORSKI) CASPER (Hydrocharitaceae) in the lower Rhine region: the first record for North Rhine-Westphalia

Zwei Funde des Mittleren Nixkrauts (Najas marina subsp. intermedia) in Gewässern der Rheinaue in Duisburg geben Anlass, auf die in Nordrhein-Westfalen noch weitgehend unbekannte Art Najas marina mit ihrenbeiden Unterarten aufmerksam zu machen, zumal es Hinweise darauf gibt, dass die Sippen bundesweit in Ausbreitung begriffen sind. Während in jüngerer Zeit die subsp. marina in Nord- und Ostwestfalen erstmals für Nordrhein-Westfalen nachgewiesen wurde, liegt mit dem Fund der subsp. intermedia in Duisburg nun der Erstnachweis dieser Unterart für Nordrhein-Westfalen vor.Recent records of the Spiny Naiad (Najas marina subsp. intermedia) in shallow gravel pits in the flood plain of River Rhine at Duisburg suggesting that this species and its too subspecies, which are fairly uncommon for North Rhine-Westphalia, are about to expand their range. This assumption is supported by similar observations, which have been made across the country. While in recent years the subsp. marina has been recorded in northern and eastern North Rhine-Westphalia, the subsp. intermedia found by Duisburg represents the first record for North Rhine-Westphalia

La Chara canescens des eaux saumâtres et la Chara filiformis dans le lac de Borken : deux découvertes remarquables en Hesse

Die Brackwasser-Armleuchteralge (Chara canescens) und die Faden-Armleuchteralge (Chara filiformis) wurden im Juni 2009 erstmals in Hessen im Borkener See, einem Restgewässer des Braunkohleabbaus in Nordhessen, nachgewiesen. Chara filiformis wurde erstmals in Deutschland in einem künstlichen Gewässer nachgewiesen. Chara canescens kommt hier in einem elektrolytarmen Gewässer vor.Chara canescens and Chara filiformis were recorded in June 2009 in Lake Borken, which is situated in northern Hesse and was formed as a result of lignite mining activities. This is the first record of Chara filiformis in an artificial lake in Germany. Chara canescens occurs in electrolyte-poor waters.La Chara canescens, croissant habituellement dans les eaux saumâtres, et la Chara filiformis ont été prouvées en Hesse pour la première fois en juin 2009 dans le Lac de Borken, formé par les eaux résiduelles de l’extraction du lignite dans le Nord de la Hesse. La chara filiforme a été établie en Allemagne pour la première fois dans des eaux articificielles. La chara grise est présente ici dans des eaux pauvres en électrolytes

Plastid DNA sequences and oospore characters of some European taxa of Tolypella section Tolypella (Characeae) identify five clusters, including one new cryptic Tolypella taxon from Sardinia, but they do not coincide with current morphological descriptions

In Europe, the genus Tolypella (Characeae) comprises four to eight Tolypella taxa in sections Rothia and Tolypella that have been distinguished by vegetative morphology and gametangial characters such as antheridial size and oospore wall ornamentation. However, morphological differentiation is difficult in some cases due to overlapping and variable vegetative features, which in many cases are difficult to observe clearly. To clarify the taxonomic status of the five European taxa of Tolypella in section Tolypella, sequence data of the plastid genes atpB, rbcL and psbC for Tolypella glomerata (Desv.) Leonh., Tolypella hispanica Allen, Tolypella nidifica (O.F. Müll.) A. Braun, Tolypella normaniana (Nordst.) Nordst. and Tolypella salina Cor. were combined with data on oospore morphology, including oospore wall ornamentation. Gene sequence data identified five distinct clusters, but they were not consistent with the morphologically identified five taxa. T. glomerata consisted of some of the samples morphologically identified as T. glomerata and seven samples of T. normaniana, while the remaining T. glomerata samples clustered with specimens of unclear affiliation (Tolypella sp.). We identified two clusters of T. hispanica within the European material: cluster T. hispanica I consisted of samples from various locations, whereas the second cluster (T. hispanica II) consisted of samples of T. hispanica from Sardinia Island. The remaining cluster consisted of all the specimens that had been determined as T. salina or T. nidifica in addition to two specimens of T. normaniana. Oospore morphology was most clearly distinguishable for T. glomerata. Oospore characteristics for all other taxa were not as informative but showed some geographical and/or environmentally influenced differences, especially for T. nidifica and T. salina. Our results suggest the need to further check the different taxonomy of Tolypella sect. Tolypella in which specimens normally identified as T. glomerata might be two different taxa, T. glomerata and an unidentified taxon; T. nidifica and T. salina are not separate taxa; T. normaniana is a diminutive variant of two different Tolypella taxa; and T. hispanica comprises two different taxa, one from the Mediterranean island Sardinia.publishedVersio

A922 Sequential measurement of 1 hour creatinine clearance (1-CRCL) in critically ill patients at risk of acute kidney injury (AKI)

Meeting abstrac

Vegetation recording in gravel pits - results of diving investigations in the Lower Rhine lowlands

Die Vegetation von kalkreichen mesotrophen Nassabgrabungen im Niederrheinischen Tiefland (Nordrhein-Westfalen) wird anhand von Linientransekten dargestellt. Für die Tiefenzone ist das Nitellopsidetum obtusae charakteristisch. Das Charetum contrariae besiedelt sowohl tiefere als auch flachere Bereiche, in denen auch Phanerogamen auftreten. Auf die Ökologie und synsystematische Stellung der Armleuchteralgen-Gesellschaft wird eingegangen.Line transects were used to describe the vegetation of mesotrophic chalk-rich gravel pits in the flood plain of the river Rhine (North-Rhine-Westphalia, Germany). Deeper zones are dominated by Nitellopsidetum obtusae, while both deep and shallow waters support Charetum contrariae with phanerogams. Notes are also provided on the ecology and syntaxonomy of the stonewort communities

Myriophyllum alterniflorum : Wechselblütiges Tausendblatt (Haloragaceae), Wasserpflanze des Jahres 2013

Myriophyllum alterniflorum besiedelt als Unterwasserpflanze sowohl stehende wie auch langsam und schnell fließende Gewässer. Es hat seinen Schwerpunkt in nährstoffarmen Gewässern und kommt in kalkarmen und kalkreichen Gewässern vor. Im vorliegenden Beitrag werden verwandte Arten, Morphologie und Biologie, aber auch Gefährdung und Schutz des Wechselblütigen Tausendblatts dargestellt

Erosion control fills in underwater monuments at Lake Constance-Obersee (Germany) : effects on macrophyte vegetation and nature conservation compatibility

Many underwater monuments in the Alpine lakes are subject to a creeping erosion process, which is counteracted with various erosion protection measures. We compared six monument stations at Überlinger See (Lake Constance, Germany), each with several construction variants aged 3 to 18 years, with nearby reference areas. Compared to the reference plots, the cobble and gravel fill areas were characterised by a lower total cover of submerged vegetation (mainly Chara species), a lower phytomass, a higher species diversity and an altered species composition. This is attributed to the lack of filling of the pore space by fine material (colmatation), which in an experiment was not completed even after more than 8 years. The effects were limited to the fill areas and did not affect the conservation objectives of the sites protected by the Habitats Directive (habitat type codes 3130, 3140). In contrast, an area secured with geotextile showed only reduced submerged vegetation even after 25 years, so that this design variant is less suitable for ecological reasons. We recommend a stronger admixture of fine gravel and sand in future fills in order to accelerate colmatation.publishe

Pharmacy supply optimization : application for Kutahya center, Turkey

Ingeniería industria

Re-Establishment Techniques and Transplantations of Charophytes to Support Threatened Species

Re-establishment of submerged macrophytes and especially charophyte vegetation is a common aim in lake management. If revegetation does not happen spontaneously, transplantations may be a suitable option. Only rarely have transplantations been used as a tool to support threatened submerged macrophytes and, to a much lesser extent, charophytes. Such actions have to consider species-specific life strategies. K-strategists mainly inhabit permanent habitats, are perennial, have low fertility and poor dispersal ability, but are strong competitors and often form dense vegetation. R-strategists are annual species, inhabit shallow water and/or temporary habitats, and are richly fertile. They disperse easily but are weak competitors. While K-strategists easily can be planted as green biomass taken from another site, rare R-strategists often must be reproduced in cultures before they can be planted on-site. In Sweden, several charophyte species are extremely rare and fail to (re)establish, though apparently suitable habitats are available. Limited dispersal and/or lack of diaspore reservoirs are probable explanations. Transplantations are planned to secure the occurrences of these species in the country. This contribution reviews the knowledge on life forms, dispersal, establishment, and transplantations of submerged macrophytes with focus on charophytes and gives recommendations for the Swedish project

Comments on increasing number and abundance of non-indigenous aquatic macrophyte species in Germany

Non-indigenous aquatic plants are a major cause of biodiversity loss in many countries. In this study, our own field data and a literature review have been used to get an overview of the history and the present distribution of non-indigenous aquatic plant species in Germany. Results show that the number of non-indigenous aquatic plant species in Germany rose from 1 in 1860 to 12 in 1980, but doubled to 24 during the following 29 years. Thirteen of these species are naturalised in at least one federal state, 11 are only ephemeral. The number of non-indigenous aquatic plant species in the German federal states is significantly correlated with the population size and area. The increase in species number and abundance is probably caused by enhanced trading and increased invasibility of waters by eutrophication/re-oligotrophication and climate change. We propose a trading ban for some highly invasive non-indigenous aquatic species. This will not stop their natural spread, but should reduce the risk of further unintended entry and thus can be a major control factor