scholarly journals Coralligenous formations dominated by Eunicella cavolini (Koch, 1887) in the NE Mediterranean: biodiversity and structure

2019 ◽  
Author(s):  
MARIA SINI ◽  
JOAQUIM GARRABOU ◽  
VASILIS TRYGONIS ◽  
DROSOS KOUTSOUBAS
Keyword(s):  
Structural Complexity ◽  
Aegean Sea ◽  
Coralline Algae ◽  
Anthropogenic Factors ◽  
Species Number ◽  
Percent Cover ◽  
Biogenic Structures ◽  
Nw Mediterranean ◽  
Ne Mediterranean

Coralligenous formations are biogenic structures typical of the underwater Mediterranean seascape. Their intricate, multi-layered species assemblages are composed of perennial, long-lived organisms, particularly vulnerable to natural or human-induced disturbances. Despite their high ecological role and conservation value, few studies have addressed the assemblages outside the NW Mediterranean. This is the first quantitative assessment of coralligenous in the N Aegean Sea (NE Mediterranean), specifically focusing at the upper bathymetric limit of assemblages that are dominated by the yellow gorgonian Eunicella cavolini. The number and percent cover of macrobenthic species were studied at depths of 18 to 35 m, using a photoquadrat method. A total of 99 benthic taxa were identified, out of which 89 perennial ones were used to investigate spatial patterns in assemblage structure, composition, and biodiversity. A mean number of 47 perennial taxa were recorded per site, with encrusting coralline algae and sponges being the dominant groups in percent cover and species number, respectively. Across the studied localities, structural complexity and community composition were overall similar, but assemblages presented distinctive differences at the level of sites highlighting the role of local abiotic and anthropogenic factors in the shaping of the coralligenous. Compared to the rest of the Mediterranean, assemblages hosted a similar number of taxa. However, the number and percent cover of erect bryozoans were generally low, while, apart from E. cavolini, other erect anthozoan species were absent. This work provides an important baseline for comparisons and monitoring at a local or Mediterranean scale level. 

Modelling of structural complexity in sedimentary basins: The role of pre-existing faults in thrust tectonics

1993 ◽  
Vol 226 (1-4) ◽  
pp. 97-112 ◽  
Author(s):  
W. Sassi ◽  
B. Colletta ◽  
P. Balé ◽  
T. Paquereau
Keyword(s):  
Structural Complexity ◽  
Sedimentary Basins ◽  
Thrust Tectonics

The role of task sequencing in fluency, accuracy, and complexity: Investigating the SSARC model of pedagogic task sequencing

2018 ◽  
Vol 24 (5) ◽  
pp. 642-665 ◽  
Author(s):  
Aleksandra Malicka
Keyword(s):  
Cognitive Complexity ◽  
Speech Rate ◽  
Structural Complexity ◽  
Simple Complex ◽  
Complexity Measures ◽  
Complex Sequence ◽  
Task Sequencing ◽  
Sequence Versus ◽  
Individual Task

This study set out to test the theoretical premise of the SSARC model of pedagogic task sequencing, which postulates that tasks should be sequenced for learners from cognitively simple to complex. This experiment compared the performance of three tasks differing in cognitive complexity in a simple–complex sequence versus in the absence of any other tasks. There were two groups in the study: (1) participants who performed the three tasks in the simple–complex sequence, and (2) participants who performed either the simple, the complex, or the most complex task. The participants’ speech was analysed using fluency, accuracy, and complexity measures. The results indicate that simple–complex sequencing led to a higher speech rate, greater dysfluency, enhanced accuracy, and greater structural complexity, as compared to individual task performance. The results are discussed in terms of the SSARC model and pedagogical implications of the findings are presented.

scholarly journals Regional musical culture management in 1939-1945 (on materials of the Volga Region)

2017 ◽  
Vol 6 (1) ◽  
pp. 139-142
Author(s):  
Olga Vladimirovna Tuzova
Keyword(s):  
Cultural Models ◽  
Structural Complexity ◽  
Volga Region ◽  
Regional Culture ◽  
Front Line ◽  
Musical Culture ◽  
Professional Affiliation ◽  
Functional Complex ◽  
Different Levels

The paper deals with some problems of musical institutions management in the Volga Region in 1939 1945 on the example of 8 musical cultural models of rear, frontal and front-line types: Kuibyshev, Ulyanovsk, Penza, Saratov, Engels, Kazan, Stalingrad, Astrakhan. The author reconstructs the structure and functional complex of the management component, describes the responsibilities of the commissioners of Performances and Repertoire Control Main Department at different levels and detects the role of the Communist party in the music management of the region. The author notes instability and incomplete correspondence of the administrative board in some models as a negative factor. A significant impact on musical culture management in the region provided emergency-revaluation processes: range of competencies and staff. Changes in the geography of governance structures affected the Stalingrad model of front type. Some actual data about the material provision of the management component are provided: departments placement and employees salaries. Structural complexity of administrative areas during 1939 1945 is stated. The author restores a number of regional culture managers names and their professional affiliation.

scholarly journals The Legacy of the Idrija Mine Twenty-Five Years after Closing: Is Mercury in the Water Column of the Gulf of Trieste Still an Environmental Issue?

2021 ◽  
Vol 18 (19) ◽  
pp. 10192
Author(s):  
Elena Pavoni ◽  
Elisa Petranich ◽  
Sergio Signore ◽  
Giorgio Fontolan ◽  
Stefano Covelli
Keyword(s):  
Water Column ◽  
Environmental Concern ◽  
Anthropogenic Factors ◽  
Northern Adriatic Sea ◽  
Northern Adriatic ◽  
High Discharge ◽  
Fine Sediments ◽  
Gulf Of Trieste ◽  
Freshwater Inputs

Mercury (Hg) contamination in the Gulf of Trieste (northern Adriatic Sea) due to mining activity in Idrija (Slovenia) still represents an issue of environmental concern. The Isonzo/Soča River’s freshwater inputs have been identified as the main source of Hg into the Gulf, especially following periods of medium-high discharge. This research aims to evaluate the occurrence and distribution of dissolved (DHg) and particulate (PHg) Hg along the water column in the northernmost sector of the Gulf, a shallow and sheltered embayment suitable for the accumulation of fine sediments. Sediment and water samples were collected under unperturbed and perturbed environmental conditions induced by natural and anthropogenic factors. Mercury in the sediments (0.77–6.39 µg g−1) and its relationship to grain size were found to be consistent with previous research focused on the entire Gulf, testifying to the common origin of the sediment. Results showed a notable variability of DHg (<LOD–149 ng L−1) and PHg (0.39–12.5 ng L−1) depending on the interaction between riverine and marine hydrological conditions. Mercury was found to be mainly partitioned in the suspended particles, especially following periods of high discharge, thus confirming the crucial role of the river inputs in regulating PHg distribution in the Gulf.

Growth and feeding patterns of European anchovy (Engraulis encrasicolus) early life stages in the Aegean Sea (NE Mediterranean)

2010 ◽  
Vol 86 (2) ◽  
pp. 299-312 ◽  
Author(s):  
Ignacio A. Catalán ◽  
Arild Folkvord ◽  
Isabel Palomera ◽  
Gemma Quílez-Badía ◽  
Fotini Kallianoti ◽  
...  
Keyword(s):  
Early Life ◽  
Aegean Sea ◽  
Life Stages ◽  
Early Life Stages ◽  
Feeding Patterns ◽  
European Anchovy ◽  
Engraulis Encrasicolus ◽  
Ne Mediterranean ◽  
European Anchovy Engraulis Encrasicolus

Formation and paleontologic recognition of structures caused by marine annelids

Paleobiology ◽  
1977 ◽  
Vol 3 (4) ◽  
pp. 389-403 ◽  
Author(s):  
Thomas E. Ronan
Keyword(s):  
Function Analysis ◽  
Structural Complexity ◽  
Soft Sediment ◽  
Water Interface ◽  
Surface Material ◽  
Near Surface ◽  
Sedimentary Structures ◽  
Biogenic Structures ◽  
Sediment Mixing ◽  
Feeding Function

Laboratory and field collected sediments were x-rayed to document the array of biogenic sedimentary structures produced by the burrowing and feeding behavior of six species of marine intertidal annelid (Glycera robusta, Nephtys caecoides, Pectinaria californiensis, Notomastus magnus, Eupolymnia crescentis, and Cirriformia spirabrancha). Polychaete burrows were found to vary greatly in structural complexity with both errant (N. magnus) and relatively sessile forms (C. spirabrancha) producing a variety of biogenic structures. Sediment mixing by the tentacle-feeding polychaete C. spirabrancha was observed by sequentially x-raying an experimental field enclosure stratified with an opaque substance. The experiment demonstrates that tentacle-feeding polychaetes can influence the topography of the sediment-water interface and transport substantial amounts of near surface material downward.Criteria by which fossil biogenic sedimentary structures, presumably produced by soft-bodied organisms, can be assigned a feeding function have been advanced by Walker (1972). Some of the assumptions inherent in feeding function analysis were applied, with varying degrees of success, to the biogenic structures of modern soft-sediment polychaetes.

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