Search results for "Littoral"

Distribution and diet of Marthasterias glacialis at Ustica Island MPA

2009

Distribution and diet of Marthasterias glacialis was studied at Ustica Island MPA. We conducted observations of the asteroid along the upper infralittoral zone using random parallel transects. M. glacialis was more abundant at study sites characterized by low densities of erect algae. Most frequent prey species was a bivalve and sea urchins

Unmanned aerial vehicle technology to assess the state of threatened biogenic formations: The vermetid reefs of mediterranean intertidal rocky coasts

2021

Abstract Vermetid bioconstructions are biogenic formations, built by sessile gastropod molluscs belonging to the family Vermetidae worldwide distributed, occurring in the intertidal and upper subtidal in the rocky shores. In the Mediterranean basin, they occur in complex and tridimensional structures that enhance the local biodiversity, allowing to qualify the structuring species as ecosystem engineers. Due to their ecological relevance and considerable extension along the coasts, we assessed their structural complexity using unmanned aerial vehicle (UAV) technology, as tool of littoral cartography analysis of these bioconstructions, and plaster hemispheres dissolution as a descriptor index…

Stable isotopes and trophic positions of littoral fishes from a Mediterranean Marine Protected Area

2008

Stable isotope analyses were employed to explore feeding and foraging habitats and trophic levels of littoral fishes in a western Mediterranean Marine Protected Area (Egadi Islands, Sicily, Italy). Carbon and nitrogen stable isotope ratios were measured in primary producers, invertebrates and fishes collected in December 2001 and January 2002. Fishes of the littoral region of the Egadi Islands had isotopic signatures that fell into a wider range for δ13C (about 6‰) than for δ15N (about 3‰). Carbon isotope ratios were consistent with a food web based on mixed sources and two trophic pathways leading to different fish species. Differences in the isotopic composition between islands were highe…

Geomorphological evolution of the River Loukkos estuary around the Phoenician city of Lixus on the Atlantic Littoral of Morocco

2009

The ancient city of Lixus, today situated on a hill on the right bank of the River Loukkos, 4km from the coast, was founded on the shore of a brackish lagoon that was sheltered from Atlantic storms. This geographical context provided the city with one of the best Phoenician harbors and abundant fishing resources, and allowed access to the Gharb cattle farming resources and cereal production systems. In this study, the historical evolution of the Loukkos estuarine environment is reconstructed through geomorphological and sedimentological analyses, combined with cartographic, archaeological, and geographical data. The outcomes reveal the progressive infilling of the estuarine lagoon of Lixus …

Comparison of sampling methods and habitat types for detecting impacts on lake littoral macroinvertebrate assemblages along a gradient of human distu…

2010

We explored environmental variables structuring littoral macroinvertebrate communities in a large lake basin along a gradient of nutrient enrichment. Furthermore, we evaluated sensitivity and cost-effi ciency of different sampling schemes (i.e. combinations of three habitat types and a number of standard sampling methods) to detect changes in macroinvertebrate communities along this anthropogenic disturbance gradient. Partial canonical ordination analysis showed that habitat characteristics accounted for a major part (56 % uniquely) of the explained variation in the species composition of invertebrate communities. When different mesohabitats were examined separately, assemblage variation of…

Notes about a new pest (Spodoptera littoralis (Boisdval, 1833) on fennel and a case of larval allotrophy of Gortina xanthenes (Germar) on Avocado fru…

1998

Growth patterns of the topshell Phorcus lineatus (da Costa, 1778) in northern Iberia deduced from shell sclerochronology

2019

Combined shell growth pattern and oxygen isotope analysis has become a powerful approach in palaeoclimate and archaeological studies for reconstructing palaeoclimate conditions and littoral exploitation patterns, respectively. Recent investigations have shown that the gastropod Phorcus lineatus (da Costa, 1778) forms its shell in conditions of near equilibrium with the oxygen isotope signature of the seawater environment, demonstrating the utility of this species for reconstruction of sea surface temperature and determination of the season of harvest in archaeological studies. In contrast, the shell growth patterns of this species have received virtually no attention despite providing infor…

Uferzellangiom - eine seltene Differentialdiagnose von Milztumoren

2008

UNLABELLED HISTORY AND PRE-ADMISSION FINDINGS: Routine abdominal sonography of a 51-year-old man 6 years after removal of the right testis and radiotherapy for a seminoma revealed a 3 cm mass within the spleen. INVESTIGATIONS All biochemical tests were normal. Computed tomography (CT) and magnetic resonance imaging confirmed the tumour which had not been present on the CT before the seminoma had been treated. No other space-occupying lesions were found in the thorax and abdomen. TREATMENT AND COURSE A splenectomy was performed because a metachronous metastasis of the seminoma was suspected. The operation and subsequent course were uneventful. At operation the tumour had been diagnosed as an…

Artisanat, commerce et nécropole. Un port de La Tène D1 à Urville-Nacqueville

2013

International audience; Nous présentons dans cet article les premiers résultats d’une fouille programmée en cours sur la plage d’Urville-Nacqueville. Initiées en 2009, ces recherches ont permis de mettre au jour les vestiges d’un centre artisanal et commercial dont le dynamisme et la prospérité sont exprimés par de nombreux marqueurs dont l’association est rarement documentée en dehors des sanctuaires ou des nécropoles (amphores républicaines, statères, parures en matériaux importés). La découverte et l’étude également en cours d’une importante nécropole située à quelques centaines de mètres de ce secteur autorisent à interpréter le site dans son ensemble comme une agglomération portuaire. …

Pin consumption on the shores of Lake Neuchâtel (Switzerland) during the palafittic Late Bronze Age

2008

The analysis of pin consumption on 5 shore settlements of Lake Neuchâtel (Western Switzerland) during the palafittic Late Bronze Age (Ha B), by the combination of temporal and spatial approaches, has outlined the evolution of bronze consumption on a regional scale.