Type of dynamic index (<i>DI</i>) and relative WICs.

<p>See <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0042128#pone-0042128-t002" target="_blank">Table 2</a> for labels. Different interpretations of the “recent times” and “former times” concepts offer an evaluation of emerging trends and stabilised trends of keywords occurrences.</p

List of selected web contexts, and relative WICs used to perform searches.

<p>The last two columns differentiate the following typologies of indicators: R = relational; D = dynamic; G = global level; N = national level; C = specific cultural contexts.</p

List of selected keywords for web profile identification.

<p>List of selected keywords for web profile identification.</p

Radar graphs of 7 selected keywords according to the following web-profile indicators: WOS.09–10%; WOS.V1; WOS.V2; WGY.en%; WGB.en%; WGT.us.V1 (see <b>Table 2</b> for labels).

<p>The interpretation criteria are: (c1) relevance in the scientific context; (c2) current relevance in the world; (c3) relevance in the individual sphere; (c4) emerging and stabilised trends of dynamic variation. For each WIC, relative percent values over the total of 24 keywords are reported.</p

Results of the relational indices (<i>RI</i>) and dynamic indices (<i>DI</i>) (See Tables 3 and 4 for labels and indices structure).

<p><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0042128#s3" target="_blank">Results</a> of the relational indices (<i>RI</i>) and dynamic indices (<i>DI</i>) (See <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0042128#pone-0042128-t003" target="_blank">Tables 3</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0042128#pone-0042128-t004" target="_blank">4</a> for labels and indices structure).</p

Types of temporal trends obtained from the year-by-year searches in the Web of Science databases: results for 6 selected keywords.

<p>Data are expressed as ratio over the maximum value, achieved in the year 2010.</p

Results of data collection from selected WICs for the scientific web, global web, social web and web news contexts (see Table 2 for WIC labels).

<p>Raw data were transformed into percentage of occurrences of a given keyword over the total number of occurrences obtained from all the 24 keywords. Bold character style indicates the most popular keywords for each WIC; underlined style indicates the least popular keywords.</p

Type of relational index (<i>RI</i>) and selected pairs of WICs considered for the comparison.

<p>See <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0042128#pone-0042128-t002" target="_blank">Table 2</a> for labels.</p

Conceptual model of the proposed approach.

<p>The meta-knowledge area, where scientific knowledge is combined with general knowledge (at the top) is the basis of decisions that produce impacts on the environment (in the centre), which in turn contribute to systems evolution (at the bottom). This process produces new scientific knowledge.</p

Role of commercial harbours and recreational marinas in the spread of non-indigenous fouling species

<p>The role of commercial harbours as sink and source habitats for non-indigenous species (NIS) and the role of recreational boating for their secondary spread were investigated by analysing the fouling community of five Italian harbours and five marinas in the western Mediterranean Sea. It was first hypothesised that NIS assemblages in the recreational marinas were subsets of those occurring in commercial harbours. However, the data did not consistently support this hypothesis: the NIS pools of some marinas significantly diverged from harbours even belonging to the same coastal stretches, including NIS occurring only in marinas. This study confirms harbours as hotspots for marine NIS, but also reveals that numbers of NIS in some marinas is higher than expected, suggesting that recreational vessels effectively facilitate NIS spread. It is recommended that this vector of NIS introduction is taken into account in the future planning of sustainable development of maritime tourism in Europe.</p