نتایج جستجو برای: rocky coasts
تعداد نتایج: 10909 فیلتر نتایج به سال:
Rocky coasts represent three quarters of all coastlines worldwide. These areas are part ecosystems great ecological value, but their steep configuration and elevation make field surveys difficult. This fact, together with lower variation rates, explains the numbers publications about cliffs rocky in general compared those beach-dune systems. The introduction UAVs research, has enormously expand...
Recent glaciation covered the full extent of rocky intertidal habitat along the coasts of New England and the Canadian Maritimes. To test whether this glaciation in fact caused wholesale extinction of obligate rocky intertidal invertebrates, and thus required a recolonization from Europe, we compared American and European populations using allelic diversity and techniques adapted from coalescen...
Investigation of minor metabolites in the extracts of the red alga Sphaerococcus coronopifolius collected from the rocky coasts of Corfu Island in the Ionian Sea yielded two new diterpene alcohols, sphaerollanes I, and II (1, 2) featuring neodolabellane skeletons, and the new sphaeroane diterpene alcohol 16-hydroxy-9S*-acetoxy-8-epi-isosphaerodiene-2 (3), along with two previously reported meta...
Kelps are ecologically important seaweeds that dominate the subtidal zones of rocky coasts. In Northern Europe, Saccorhiza polyschides is a pioneer species suspected of outcompeting the harvested kelp, Laminaria digitata. To examine how the process of species competition affects species distribution and genetic diversity in coastal environments, we developed 10 polymorphic microsatellite marker...
Studies of intraspecific variation in the presence of different environmental features are essential in improving the knowledge of species population dynamics and structure. Sea surface temperature (SST) plays a fundamental role on the fertilization period of scleractinian corals. Astroides calycularis is an azooxanthellate scleractinian coral commonly found in shallow rocky habitats of the sou...
Seven species of eunicids were found from rocky intertidal and shallow subtidal habitats on the coasts of Taiwan. These polychaetous worms belong to two genera, Eunice Cuvier, 1817 and Nicidion Kinberg, 1865. Among them, five species are new to science, namely Eunice jihueiensis sp. nov., Eunice reticulata sp. nov., Eunice shihmenensis sp. nov., Eunice taoi sp. nov., and Nicidion megabalanicola...
Shore platform erosion is considered a driving mechanism for cliff recession on many rocky coasts and, in the vicinity of sea defence structures, a threat to their stability, yet the spatial pattern of platform erosion, as well as the rate of lowering, is poorly documented. Measurements based on techniques such as the micro-erosion metre or laser scanner, though highly accurate for short time s...
Leiopathes glaberrima is a tall arborescent black coral species structuring important facies of the deep-sea rocky bottoms of the Mediterranean Sea that are severely stifled by fishing activities. At present, however, no morphological in vivo description, ecological characterization, age dating and evaluation of the possible conservation actions have ever been made for any population of this sp...
The April 1st 2014 Iquique earthquake (MW 8.1) occurred along the northern Chile margin where the Nazca plate is subducted below the South American continent. The last great megathrust earthquake here, in 1877 of Mw ~8.8 opened a seismic gap, which was only partly closed by the 2014 earthquake. Prior to the earthquake in 2013, and shortly after it we compared data from leveled benchmarks, deplo...
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