The water louse Asellus aquaticus is a widespread, euryoecious species, mostly uniform throughout its range. However, six subspecies are known from the Dinaric karst in the northwestern Balkans. They include some specialized subterranean populations. The pattern of genetic variation among subterranean and surface populations in this hydrographically highly fragmented karst region was investigat...

This paper presents a two-layer network for extracting hydrographic objects, such as rivers, from satellite images. The first layer is a locally connected network, which per$orms nonlinear smoothing. A unique property of the network is that boundaries and junctions are preserved with high accuracy while noise within each region is greatly suppressed. A second layer is a locally excitatory globa...

Many marine protists form resting stages that can remain viable in coastal sediments for several decades. Their long-term survival offers the possibility to explore the impact of changes in environmental conditions on population dynamics over multidecadal time scales. Resting stages of the phototrophic dinoflagellate Pentapharsodinium dalei were isolated and germinated from five layers in dated...

A total of 117 species of freshwater decapod crustaceans are known from Brazil. Knowledge regarding the fauna of Decapoda from inland waters in the state of Bahia, northeast Brazil, is incipient. In spite of its wide territory and rich hydrographic net, only 13 species of limnetic decapods have been reported from that state. The objective of this contribution was to survey decapod crustaceans o...

Near Omišalj on the island of Krk, where construction a pier for liquefied gas is planned, hydrographic measurements revealed three shoals at depths 13.5 and 13.6 metres. For safety navigation, seabed had to be deeper than 15.4 m. The geological fabric was determined using hydroacoustic survey remote operating vehicle. Shallows are formed in solid carbonate rock mass. Special technology excavat...

One of the main environmental problem that need efficient software tools is the prediction problem. More concrete, it can mean meteorological prediction, air/soil/water pollution prediction, flood prediction and so on. In the last decade several methods based on artificial intelligence were proposed by taken into account that they can offer more informed methods that use domain specific knowled...

Observations of sea surface height reveal that substantial changes have occurred over the past decade in the mid- to high-latitude North Atlantic Ocean. TOPEX/Poseidon altimeter data show that subpolar sea surface height increased during the 1990s, and the geostrophic velocity derived from altimeter data exhibits declining subpolar gyre circulation. Combining the data from earlier satellites, w...

Depth-contours are an essential part of any hydrographic chart—a map of a waterbody intended for safe ship navigation. Traditionally these were manually drawn by skilled hydrographers from a limited set of surveyed depth measurements. Nowadays this process of map making is shifted towards the digital domain, not in the last place because of the sheer size of the point clouds that result from mo...

This paper presents a new approach to extracting hydrographic objects such as rivers, lakes, and other water bodies from digital orthophoto images. A family of directional-sensitive operators is derived and applied to suppress the noise while preserving the desired features. The unique property of this operator family is that boundaries and junctions are preserved with high accuracy while noise...