Advances in Oceanography and Limnology 2019-05-20T17:30:05+02:00 Nadia Moscato Open Journal Systems <p><strong>Advances in Oceanography and Limnology</strong>&nbsp;(<em>AIOL Journal</em>) is the official publication of the <a href="" target="_blank" rel="noopener">Italian Association of Limnology and Oceanology</a> (A.I.O.L.).</p> <p>The <em>AIOL Journal </em>publishes original research articles and reviews on different topics and novel discoveries in the fields of limnology and oceanography. Papers may deal with different or single physical, chemical and biological aspects, including biomolecules, populations and communities, ecosystem functioning and interactions between global change and ecosystems. Environmental monitoring and studies of regional importance will be considered only if they contribute to the general advance of aquatic sciences. Multidisciplinary articles linking different scientific disciplines (e.g., community ecology and metabolomic/toxicology, ecology and phylogenetic, water quality and economy…) are equally considered. Particularly welcomed are studies focusing on marine and freshwater ecosystems.</p> <p>Two regular issues of the <strong>Advances in Oceanography and Limnology</strong> are published each year. In addition, Special Issues and Proceedings that focus on topics that are timely and of interest to a significant number of aquatic scientists are published. From 2010 to 2014, previous issues of the <em>AIOL Journal</em> have been published by&nbsp;<a href="">T&amp;F</a>.</p> <p>This journal does not apply charge for publication to Authors as it is supported by institutional funds.</p> Fluxes of particulate matter, carbonates, organic carbon and nitrogen in the northern Adriatic continental shelf: A synthesis overview 2019-05-20T17:30:05+02:00 Michele Giani Juan Carlos Miquel Amelia De Lazzari Alfredo Boldrin <p>Time series of composition and fluxes of settling particles in the marine environment, obtained by sediment traps, contribute to define the main processes driving the dynamics of particulate matter and of the time/space variability of benthic-pelagic exchanges. With this aim, the composition and seasonal and annual fluxes of settling matter, obtained from different projects and from published papers, at 8 sites of the Northern Adriatic shelf were estimated. &nbsp;The mean yearly particulate fluxes varied from 2763 to 14,447 g m<sup>-2</sup> y<sup>-1</sup>, from 66 to 236 gC m<sup>-2</sup>y<sup>-1</sup> for organic carbon (OC) flux, from 861 to 7525 g m<sup>-2</sup>y<sup>-1</sup> for carbonates and from 12 to 42 gN m<sup>-2</sup>y<sup>-1</sup> for nitrogen (N). The fluxes were characterized by high seasonal variations with marked increase in autumn or in winter with respect to spring or summer. The sink of particles occurs in relatively short episodes as about 50% of annual particle flux settles in less than 1-2 months in the western coastal area. This seasonality can be related to the riverine discharges, primary production and wind regimes of the basin. Utilizing the N/OC ratio as an index for discriminating the different origin of organic matter (<em>i.e</em>., resuspended/riverine and autochthonous), the primary marine carbon flux was estimated to range from 10 to 28% of the OC fluxes and accounted for 8-40% of the primary production, depending on the site. Then, due to the shallow waters of the basin and to the relevant riverine inputs, the total fluxes near the sea bottom were highly dependent on resuspension and advective transport processes. The important contribution of these last processes as source of organic matter is suggested also by the comparison between fluxes determined by sediment traps with mass accumulation rates (MAR) in sediments, derived from radionuclide measurements. Indeed, the fraction of OC fluxes which is not buried in the sediment is sufficient to support the benthic respiration processes.</p> 2018-12-07T08:18:40+01:00 ##submission.copyrightStatement## The influence of habitat complexity on fish assemblages associated with extractive platforms in the central Mediterranean Sea 2019-05-20T17:30:04+02:00 Pierpaolo Consoli Maria Cristina Mangano Gianluca Sarà Teresa Romeo Franco Andaloro <p>In this work the influence of habitat complexity on fish assemblages associated with extractive platforms in the Mediterranean Sea was investigated. More specifically, at large spatial scale we tested the differences in fish assemblage between 4-legs vs 8-legs platforms, whereas at medium scale we evaluated, within each platform, the differences between internal structures with increasing complexity degrees (respectively: the water volume without any pillar - complexity “0”; the junction of two pillars - “1”; the junction of four pillars - “2”). Both univariate and multivariate analyses showed highly significant differences for each of the tested factors, as well as for their interaction. In general, at both medium and large spatial scales, mean species richness and abundance were positively correlated with the increasing habitat complexity with the highest values associated with 8-legs platforms and with the most complex internal structures within each platform. According to our findings, a more complex structure is able to attract more fish species and specimens than a less complex one, supporting previous studies carried out on different man-made structures outside the Mediterranean Sea. The study will integrate the still poor available knowledge baseline on the attractive potential of extractive platforms with strong implications for the environmental management under the incoming light of decommission in the basin.</p> 2018-12-07T08:31:49+01:00 ##submission.copyrightStatement## The heavy metals/trace elements contents of sediments from Owalla Reservoir, Osun State, Southwest Nigeria 2019-05-20T17:30:03+02:00 Adedeji Idowu Aduwo Israel Funso Adeniyi <p>The heavy metals/trace elements contents of sediment samples from Owalla Reservoir were analyzed every three months in two annual cycles (March 2011 – February 2013). The main aim was to measure concentrations of selected elements in sediment samples, their variations in space and seasons and the level of pollution and/or contamination. The bottom sediment samples were collected with a Van Veen Grab and the elemental analysis in the laboratory was based on air-dried samples following standard methods. The overall hierarchy of heavy metals/trace elements in the sediments of the reservoir was in the decreasing order of concentrations: Fe &gt; Mn &gt; As &gt; Zn &gt; Ni &gt; Co &gt; Cr &gt; Cu &gt; Pb &gt; Cd. The concentrations of the heavy metals did not follow any definite pattern from the upstream-downstream basin, although most of them (Cu, Fe, Mn, Zn, and Co) showed significant differences (P&lt;0.05) in their horizontal variations. Mn, Pb, Co, Fe, Ni, and Zn were significantly (P&lt;0.05) higher at the open water region than in the littoral region. All the elements except Ni did not show significant seasonal variations (P&gt;0.05). Most of the elements in the reservoir sediment have concentrations within the background levels and concentrations defined in environmental regulations and guidelines, except for As and Cd. The contamination factors (C<sub>f</sub>) for most metals (Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) suggested low contamination in the sediments (C<sub>f</sub> &lt; 1.0). Conversely, the sediments were moderately contaminated with Cd (C<sub>f</sub> = 2.41) and very highly contaminated with As (C<sub>f</sub> = 19.33).</p> 2018-12-20T09:22:55+01:00 ##submission.copyrightStatement## Diatom diversity in headwaters influenced by permafrost thawing: First evidence from the Central Italian Alps 2019-05-20T17:30:01+02:00 Federica Rotta Leonardo Cerasino Anna Occhipinti-Ambrogi Michela Rogora Roberto Seppi Monica Tolotti <p>Glacier melting and permafrost thawing are the most evident effects of the current climate change that is strongly affecting high mountain areas, including the European Alps. As the thawing rate of subsurface ice is lower than for glacier ice, it is expected that, while glaciers retreat, an increasing number of Alpine headwaters will become more influenced by permafrost degradation during the 21<sup>st</sup> century. Despite the expected change in the relative importance of glacier and permafrost in determining Alpine hydrology, studies addressing effects of permafrost thawing on chemical and, especially, biological features of adjacent surface waters are still scarce. The present study contributes to characterise the epilithic and epiphytic diatom diversity in a set of permafrost-fed headwaters in three sub-catchments differing in bedrock lithology of the Italian Central Alps (Trentino Alto-Adige) in relation to water chemistry and habitat features. In addition, it explores chemical and biological differences between permafrost-fed streams and headwaters with no direct contact to permafrost, namely glacier-fed (kryal) and precipitation-/groundwater-fed (rhithral) streams. Permafrost-fed waters showed higher electrical conductivity and enhanced ion concentrations than glacier- and precipitation-fed waters, while concentration of trace elements (<em>e.g</em>. Sr, Ni, Zn, As) were more irregularly distributed among waters of different origin, though they showed a tendency to reach higher levels in permafrost-fed waters. Diatom species richness and diversity were lower in permafrost-fed headwaters, and were principally related to water pH and trace metal concentrations. Epiphytic diatom assemblages were more diverse than epilithic ones, independently from the water origin, while differences in species composition were not sufficient to unequivocally identify a typical diatom composition for the different water types considered in this study.</p> 2018-12-20T09:44:16+01:00 ##submission.copyrightStatement## Unraveling the complexity of Corbicula clams invasion in Lake Garda (Italy) 2019-05-20T17:29:57+02:00 Joaquin Lopez-Soriano Sergio Quiñonero-Salgado Cristina Cappelletti Filippo Faccenda Francesca Ciutti <p>Lake Garda, the largest Italian lake, is suffering from the introduction of several non-indigenous species during the last decades and can now be considered one of the main European freshwater hotspots of xenodiversity. Among the Bivalvia (Veneroidea, Cyrenidae), <em>Corbicula fluminea</em> and <em>Corbicula fluminalis</em> were first recorded in 2002 and 2008 respectively, and are now widespread in the southern part of the basin. Recent observation of specimens that did not resemble either of these taxa, suggested that the populations of invasive <em>Corbicula </em>of Lake Garda could include some other taxa not previously recorded. With this aim, a thoroughly characterization of <em>Corbicula</em> shells found at Lake Garda was made. By studying morphometric parameters and comparing them with specimens collected in Spain (Ebro and Ter rivers), the presence in Lake Garda of two other related species not previously recorded in Italy, namely <em>C</em>. <em>leana</em> and <em>C. largillierti</em>, has been confirmed. The syntopic presence of at least four species of this genus in a single environment is a singular occurrence both in Italy and Europe.</p> 2018-12-20T13:52:32+01:00 ##submission.copyrightStatement##