The Experts below are selected from a list of 180 Experts worldwide ranked by ideXlab platform
Laura Airoldi - One of the best experts on this subject based on the ideXlab platform.
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development of reproductive structures in the introduced green alga codium fragile ssp tomentosoides in the northern adriatic sea
European Journal of Phycology, 2007Co-Authors: Fabio Bulleri, Maria Giovanna Branca, Marco Abbiati, Laura AiroldiAbstract:Biological invasions are among the most important drivers of global change. The introduced green alga, Codium fragile ssp. tomentosoides, has become an important component of low-shore assemblages on hard coastal defence structures along the north-west coast of the Adriatic Sea. We investigated the temporal dynamics, the spatial scales of variation and the effects of wave exposure on the abundance of reproductive structures of C. fragile. Furthermore, we assessed whether the reproductive output of C. fragile was correlated with the density of thalli. On the Landward Side of breakwaters, gametangia were found on thalli of C. fragile from June to September in both 2003 and 2004. Although there was some variation among breakwaters, the abundance of gametangia of C. fragile was greater on the Landward than on the seaward Side of breakwaters. Scales of variation in the number of gametangia and density of thalli of C. fragile were similar, with most of the variability occurring at a scale of tens of cm. Little ...
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the colonisation of human made structures by the invasive alga codium fragile ssp tomentosoides in the north adriatic sea ne mediterranean
Hydrobiologia, 2006Co-Authors: Fabio Bulleri, Marco Abbiati, Laura AiroldiAbstract:Human-made structures, such as groynes, breakwaters, seawalls, pier pilings and floating pontoons, are becoming common features of the landscape in urbanised coastal and estuarine areas. Despite this tendency few studies have focused on their ecology or on their potential impacts on natural assemblages of organisms. When artificial structures are introduced in areas with little or no hard substrata, they not only provide novel habitats, which enables the colonisation of sandy areas by hard-bottom dwelling species, but they can also provide suitable habitats for exotic species. Along the north-east coast of Italy, sandy shores are protected from erosion by a line of breakwaters, which runs almost uninterrupted for about 300 km. These structures provide habitat for a variety of macroalgae and invertebrates and also for the invasive green alga Codium fragile ssp. tomentosoides. The aim of this study was, therefore, to investigate patterns of distribution of this alga on breakwaters in Cesenatico. In particular, we compared the density of thalli, biomass, length and degree of branching of C. fragile ssp. tomentosoides between the Landward and the seaward Sides of breakwaters, to test the hypothesis that sheltered habitats (Landward) represent more suitable habitats than exposed habitats (seaward). In general, the Landward Side of breakwaters supported greater numbers of thalli of C. fragile ssp. tomentosoides than seaward Sides. Thalli grew longer and more branched in sheltered habitats, leading to an overall larger biomass of the alga on the Landward Side of breakwaters. The presence of sheltered human-made hard substrata in the vicinity of major trading ports and sources of eutrophication could enhance the dispersal of invasive species across regional and geographic scales. Thus, the effects of artificial structures and introduced species on coastal assemblages cannot be evaluated separately, but their synergistic nature should be conSidered in planning strategies for conservation of biodiversity in coastal habitats.
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distribution and dynamics of epibiota on hard structures for coastal protection
Estuarine Coastal and Shelf Science, 2003Co-Authors: F Bacchiocchi, Laura AiroldiAbstract:Hard structures for protection against erosion of shores are some of the most common human-made constructions in coastal areas. Nevertheless, little is known as to how marine organisms respond to their presence. The composition and distribution of intertidal epibiota at different positions around different types of defence structures (groynes and breakwaters) at three stations along the Emilia Romagna coast (Italy) were analysed. Sampling covered a range of scales: meters (distance among replicate plots), hundreds of meters (distance among replicate areas) and tens of kilometres (distance among stations). The colonisation and dynamics of conspicuous species over 1 year, following maintenance works on two structures, were also quantified. Assemblages on defence structures were characterised by a notably low richness of species, by strong spatial dominance of mussels and green ephemeral algae, and by high rates of colonisation. Abundance of mussels, Enteromorpha intestinalis and filamentous algae differed significantly among nearby areas within stations. Mussels were significantly less abundant along the Landward Side of breakwaters compared with all other positions on both groynes and breakwaters. Overall, however, fewer differences, than expected, were observed in the distribution of species at different positions around groynes and breakwaters, probably as a consequence of the low complexity of the colonising assemblages. Possible factors explaining the patterns of distribution observed are discussed, including the roles of harvesting of mussels and frequent maintenance works on the structures. The implications of the low richness of species observed in terms of management of defence structures and other human-made constructions are discussed.
Fabio Bulleri - One of the best experts on this subject based on the ideXlab platform.
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development of reproductive structures in the introduced green alga codium fragile ssp tomentosoides in the northern adriatic sea
European Journal of Phycology, 2007Co-Authors: Fabio Bulleri, Maria Giovanna Branca, Marco Abbiati, Laura AiroldiAbstract:Biological invasions are among the most important drivers of global change. The introduced green alga, Codium fragile ssp. tomentosoides, has become an important component of low-shore assemblages on hard coastal defence structures along the north-west coast of the Adriatic Sea. We investigated the temporal dynamics, the spatial scales of variation and the effects of wave exposure on the abundance of reproductive structures of C. fragile. Furthermore, we assessed whether the reproductive output of C. fragile was correlated with the density of thalli. On the Landward Side of breakwaters, gametangia were found on thalli of C. fragile from June to September in both 2003 and 2004. Although there was some variation among breakwaters, the abundance of gametangia of C. fragile was greater on the Landward than on the seaward Side of breakwaters. Scales of variation in the number of gametangia and density of thalli of C. fragile were similar, with most of the variability occurring at a scale of tens of cm. Little ...
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the colonisation of human made structures by the invasive alga codium fragile ssp tomentosoides in the north adriatic sea ne mediterranean
Hydrobiologia, 2006Co-Authors: Fabio Bulleri, Marco Abbiati, Laura AiroldiAbstract:Human-made structures, such as groynes, breakwaters, seawalls, pier pilings and floating pontoons, are becoming common features of the landscape in urbanised coastal and estuarine areas. Despite this tendency few studies have focused on their ecology or on their potential impacts on natural assemblages of organisms. When artificial structures are introduced in areas with little or no hard substrata, they not only provide novel habitats, which enables the colonisation of sandy areas by hard-bottom dwelling species, but they can also provide suitable habitats for exotic species. Along the north-east coast of Italy, sandy shores are protected from erosion by a line of breakwaters, which runs almost uninterrupted for about 300 km. These structures provide habitat for a variety of macroalgae and invertebrates and also for the invasive green alga Codium fragile ssp. tomentosoides. The aim of this study was, therefore, to investigate patterns of distribution of this alga on breakwaters in Cesenatico. In particular, we compared the density of thalli, biomass, length and degree of branching of C. fragile ssp. tomentosoides between the Landward and the seaward Sides of breakwaters, to test the hypothesis that sheltered habitats (Landward) represent more suitable habitats than exposed habitats (seaward). In general, the Landward Side of breakwaters supported greater numbers of thalli of C. fragile ssp. tomentosoides than seaward Sides. Thalli grew longer and more branched in sheltered habitats, leading to an overall larger biomass of the alga on the Landward Side of breakwaters. The presence of sheltered human-made hard substrata in the vicinity of major trading ports and sources of eutrophication could enhance the dispersal of invasive species across regional and geographic scales. Thus, the effects of artificial structures and introduced species on coastal assemblages cannot be evaluated separately, but their synergistic nature should be conSidered in planning strategies for conservation of biodiversity in coastal habitats.
Marco Abbiati - One of the best experts on this subject based on the ideXlab platform.
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development of reproductive structures in the introduced green alga codium fragile ssp tomentosoides in the northern adriatic sea
European Journal of Phycology, 2007Co-Authors: Fabio Bulleri, Maria Giovanna Branca, Marco Abbiati, Laura AiroldiAbstract:Biological invasions are among the most important drivers of global change. The introduced green alga, Codium fragile ssp. tomentosoides, has become an important component of low-shore assemblages on hard coastal defence structures along the north-west coast of the Adriatic Sea. We investigated the temporal dynamics, the spatial scales of variation and the effects of wave exposure on the abundance of reproductive structures of C. fragile. Furthermore, we assessed whether the reproductive output of C. fragile was correlated with the density of thalli. On the Landward Side of breakwaters, gametangia were found on thalli of C. fragile from June to September in both 2003 and 2004. Although there was some variation among breakwaters, the abundance of gametangia of C. fragile was greater on the Landward than on the seaward Side of breakwaters. Scales of variation in the number of gametangia and density of thalli of C. fragile were similar, with most of the variability occurring at a scale of tens of cm. Little ...
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the colonisation of human made structures by the invasive alga codium fragile ssp tomentosoides in the north adriatic sea ne mediterranean
Hydrobiologia, 2006Co-Authors: Fabio Bulleri, Marco Abbiati, Laura AiroldiAbstract:Human-made structures, such as groynes, breakwaters, seawalls, pier pilings and floating pontoons, are becoming common features of the landscape in urbanised coastal and estuarine areas. Despite this tendency few studies have focused on their ecology or on their potential impacts on natural assemblages of organisms. When artificial structures are introduced in areas with little or no hard substrata, they not only provide novel habitats, which enables the colonisation of sandy areas by hard-bottom dwelling species, but they can also provide suitable habitats for exotic species. Along the north-east coast of Italy, sandy shores are protected from erosion by a line of breakwaters, which runs almost uninterrupted for about 300 km. These structures provide habitat for a variety of macroalgae and invertebrates and also for the invasive green alga Codium fragile ssp. tomentosoides. The aim of this study was, therefore, to investigate patterns of distribution of this alga on breakwaters in Cesenatico. In particular, we compared the density of thalli, biomass, length and degree of branching of C. fragile ssp. tomentosoides between the Landward and the seaward Sides of breakwaters, to test the hypothesis that sheltered habitats (Landward) represent more suitable habitats than exposed habitats (seaward). In general, the Landward Side of breakwaters supported greater numbers of thalli of C. fragile ssp. tomentosoides than seaward Sides. Thalli grew longer and more branched in sheltered habitats, leading to an overall larger biomass of the alga on the Landward Side of breakwaters. The presence of sheltered human-made hard substrata in the vicinity of major trading ports and sources of eutrophication could enhance the dispersal of invasive species across regional and geographic scales. Thus, the effects of artificial structures and introduced species on coastal assemblages cannot be evaluated separately, but their synergistic nature should be conSidered in planning strategies for conservation of biodiversity in coastal habitats.
Farid Dahdouhguebas - One of the best experts on this subject based on the ideXlab platform.
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mangroves facing climate change Landward migration potential in response to projected scenarios of sea level rise
Biogeosciences, 2014Co-Authors: Diana Di Nitto, Griet Neukermans, Nico Koedam, Helen Defever, Frank Pattyn, James Gitundu Kairo, Farid DahdouhguebasAbstract:Mangrove forests prominently occupy an intertidal boundary position where the effects of sea level rise will be fast and well visible. This study in East Africa (Gazi Bay, Kenya) addresses the question of whether mangroves can be resilient to a rise in sea level by focusing on their potential to migrate towards Landward areas. The combinatory analy- sis between remote sensing, DGPS-based ground truth and digital terrain models (DTM) unveils how real vegetation assemblages can shift under different projected (minimum (+ 9 cm), relative (+ 20 cm), average (+ 48 cm) and maxi- mum (+ 88 cm)) scenarios of sea level rise (SLR). Under SLR scenarios up to 48 cm by the year 2100, the Landward extension remarkably implies an area increase for each of the dominant mangrove assemblages except for Avicennia ma- rina and Ceriops tagal, both on the Landward Side. On the one hand, the increase in most species in the first three scenar- ios, including the socio-economically most important species in this area, Rhizophora mucronataand C. tagal on the sea- ward Side, strongly depends on the colonisation rate of these species. On the other hand, a SLR scenario of + 88 cm by the year 2100 indicates that the area flooded only by equinoctial tides strongly decreases due to the topographical settings at the edge of the inhabited area. Consequently, the Landward Avicennia-dominated assemblages will further decrease as a formation if they fail to adapt to a more frequent inundation. The topography is site-specific; however non-invadable areas can be typical for many mangrove settings.
Maria Giovanna Branca - One of the best experts on this subject based on the ideXlab platform.
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development of reproductive structures in the introduced green alga codium fragile ssp tomentosoides in the northern adriatic sea
European Journal of Phycology, 2007Co-Authors: Fabio Bulleri, Maria Giovanna Branca, Marco Abbiati, Laura AiroldiAbstract:Biological invasions are among the most important drivers of global change. The introduced green alga, Codium fragile ssp. tomentosoides, has become an important component of low-shore assemblages on hard coastal defence structures along the north-west coast of the Adriatic Sea. We investigated the temporal dynamics, the spatial scales of variation and the effects of wave exposure on the abundance of reproductive structures of C. fragile. Furthermore, we assessed whether the reproductive output of C. fragile was correlated with the density of thalli. On the Landward Side of breakwaters, gametangia were found on thalli of C. fragile from June to September in both 2003 and 2004. Although there was some variation among breakwaters, the abundance of gametangia of C. fragile was greater on the Landward than on the seaward Side of breakwaters. Scales of variation in the number of gametangia and density of thalli of C. fragile were similar, with most of the variability occurring at a scale of tens of cm. Little ...
