Temporal changes of soft-bottom zoobenthic communities in and around Alsancak Harbor (Izmir Bay, Aegean Sea), with special attention to the autecology of exotic species

Temporal and spatial variation in soft‐bottom benthic communities following recovery from a pollution episode were studied between January and September 2004 in and around Alsancak Harbor, located in the polluted part of Izmir Bay (Aegean Sea, eastern Mediterranean). Samples were collected at seven stations by van Veen grab. Three additional stations were sampled by means of a beam trawl to take into account large mobile animals and for a better estimate of the local biodiversity. A total of 231 species belonging to 10 zoobenthic groups were found. Polychaetes contributed 90% of the total faunal populations and mollusks 87% of the total biomass in the area. Community parameters varied significantly among stations and sampling periods; number of species ranged from 2 to 79 per 0.1 m² grab sample; density from 20 to 81,720 ind·m^?2; biomass from 0.1 to 4190 g·m^?2; Shannon–Wiener diversity index (log₂ base) from 0.4 to 4.4; and Pielou's evenness index from 0.11 to 1.0. Collections indicate that a number of species, including those sensitive to pollution, have colonized the area where azoic conditions had been previously reported. A total of six exotic species, Streblospio gynobranchiata, Polydora cornuta, Hydroides dianthus, Hydroides elegans, Anadara demiri and Fulvia fragilis, probably transferred to the area via ballast water or hull fouling, dominated soft or hard substrata in and near Alsancak Harbor. The first two species accounted for more than 70% of the total population in the area, while A. demiri contributed the most to the biomass (93%, at station 7).     

Depth Distribution and Abundance of Northern Adriatic Littoral Rocky Reef Blennioid Fishes (Blenniidae and Tripterygion)

Abstract. Species' depth distributions and abundances were visually assessed along 24 transects in a northern Adriatic assemblage of blennioid fishes (14 species of Blenniidae , 1 species of Triptery-giidue). Total abundance of blennioids was highest in 0.5-1 m depth, decreasing upwards and downwards. Species diversity (S hannon -W iener ) is highest at the shallowest depth (0-0.5 in). The curybathic species Parablennius incognitus, Lipophrys dalmatinus, Tripterygion tripteronotus , and Parablennius tentacularis were most abundant at all depths (relative to the species investigated). All stenobathic species were most abundant at 0-0.5 m. Depth distribution patterns and abundance ranks of species were similar at western, eastern, southern, and northern transects.     

La constante solar

Sans résumé     

Die Schwere im Gebirge

Zusammenfassung Einige einfache Beziehungen zwischen den Schwere-Werten und der Formung der Gebirge werden gezeigt.

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Summary Some simple relations between the formation of the mountains and the gravity are discussed.

     

Mitteilungen

Ohne Zusammenfassung     

Fluchtentafeln zur Bestimmung der Temperaturkorrekturwerte beim Arbeiten mit Kippthermometern

Zusammenfassung Auf der Grundlage der Hansen-Schumacherschen Kippthermometertabellen werden vier Fluchtentafeln entworfen, deren Vorzüge in ihrer besonders schnellen Herstellungsweise, ihrer einfachen und zeitersparenden Anwendungsweise und ihrem verhältnismäßig geringen Raumbedarf bestehen.

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Nomograms for correcting the readings of reversible thermometers

Summary Basing on correction tables for reversible thermometers after Hansen-Schumacher four nomograms are designed which are characterized by their particularly quick way of establishment, their simple and time-saving way of employment and the comparatively small space required.

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Nomogrammes pour corriger les indications de thermomètres à renversement

Résumé Quatre nomogrammes sont présentés qui s'appuient sur les tables de correction pour les thermomètres à renversement d'après Hansen-Schumacher. Ces nomogrammes sont signalés par leur mode particulièrement rapide d'établissement et par leur simplicité et vitesse d'emploi; de plus, ils sont peu encombrants.

     

Über die Temperatur der Sonne nach dem Wien'schen Verschiebungsgesetz

Summary Two determination of the sun's temperatur by application of the law ofWien on 2 published bolometer-curves of the Astrophysical Observatory, Washington.