Invasion of alien macroalgae in the Venice Lagoon, a pest or a resource?

Buosi, Alessandro; Wolf, Marion Adelheid; Sfriso, A.

doi:10.3391/ai.2020.15.2.03

Cited by 27 publications

(45 citation statements)

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“…The lagoon of Venice is a hotspot of non-indigenous species (NIS) [37], with over 30 macroalgal species whose extra-Mediterranean origin has been verified [38,39]. Out of the total 323 seaweed taxa reported for the lagoon, in 2018 the contribution of NIS to the total biomass was approximately 32% (146,521 tons fw).…”

Section: Discussionmentioning

confidence: 99%

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Settlement and Spreading of the Introduced Seaweed Caulacanthus okamurae (Rhodophyta) in the Mediterranean Sea

et al. 2020

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In this study, we report the first finding of the non-indigenous seaweed Caulacanthus okamurae (Rhodophyta) in the Ionian and Adriatic Seas (Mediterranean). Specimens were identified through molecular analyses based on the plastid ribulose-1,5-bisphosphate carboxylase/oxygenase (rbcL) marker. The sequences obtained during this study represent the first molecular evidence of the presence of this taxon in the Mediterranean Sea. Stable populations have been detected in some areas of the Mar Piccolo of Taranto (Italy) and in the whole lagoon of Venice, forming dense patches of low turf that reach high biomasses. Turf-forming algae are common in the intertidal zones of tropical regions, but are rare in temperate ones. The particular environmental conditions of transitional water systems, such as the Mar Piccolo of Taranto and the Venice Lagoon, together with the water temperature increase observed in the last years could have favored the settlement and spread of this introduced species.

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Section: Discussionmentioning

confidence: 99%

“…In the lagoon of Venice, C. okamurae can be considered invasive, because it colonizes every suitable substratum of the area. However, even though it reduces the presence of other species, it does not replace them, contributing to increase biodiversity, as shown by Sfriso and collaborators [39] for the other macroalgal NIS.…”

Section: Discussionmentioning

confidence: 99%

Settlement and Spreading of the Introduced Seaweed Caulacanthus okamurae (Rhodophyta) in the Mediterranean Sea

et al. 2020

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“…Grateloupia C. Agardh is a red algal genus (Halymeniales, Rhodophyta) with an unusually large percentage of introduced species in Europe (Verlaque et al 2005(Verlaque et al , 2007De Clerck et al 2005a;Wilkes et al 2006;Cecere et al 2011;Wolf et al 2014;Sfriso et al 2019). Along the northeast Atlantic coast, four out of nine species are considered introduced, while in the Mediterranean Sea as many as eight of the 13 species are introduced ( Table 1).…”

Section: Introductionmentioning

confidence: 99%

Morphological and molecular assessment of Grateloupia (Halymeniales, Rhodophyta) from Egypt revealed a new introduced species in the Mediterranean Sea, Grateloupia gibbesii

et al. 2021

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The Mediterranean Sea is a hotspot for introduced marine species, including seaweeds. Among red algae, Grateloupia, with no less than eight introduced species, occupies a prominent position. Here, we report a large foliose Grateloupia species collected in Eastern Harbour, Alexandria, Egypt, which had previously been reported as G. acuminata and G. doryphora. Comparison of rbcL gene sequences revealed that the specimens represent G. gibbesii, a species originally described from Charleston, South Carolina, USA and potentially distributed in the warm temperate and tropical western Atlantic Ocean. The species has been known only from a single location in Alexandria since the early 1990s, it has not been reported in extensive surveys prior to that date, and there are no reports from other Mediterranean sites. This indicates a recent introduction, with shipping the likely vector. We describe the vegetative and reproductive morphology of G. gibbesii as the basis for evaluating variation in female reproductive structures and generic concepts in Grateloupia.

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“…Of course, the lack of a large and convincing evidence base on NIS invasion impacts is an element that reinforces this way of thinking [ 97 ]. A particular aspect of denialism (often gladly invoked by interested actors in the market) aims at emphasizing the positive effects of some introductions of AS in given environments, in order to enhance depleted biological production, or even to replace native species gone locally extinct due to other causes [ 98 , 99 , 100 , 101 ]. In general, the claim of increasing community biodiversity by adding new species [ 102 ] is gaining momentum.…”

Section: Impacts By Nismentioning

confidence: 99%

Biopollution by Invasive Marine Non-Indigenous Species: A Review of Potential Adverse Ecological Effects in a Changing Climate

Occhipinti‐Ambrogi

2021

IJERPH

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Biopollution by alien species is considered one of the main threats to environmental health. The marine environment, traditionally less studied than inland domains, has been the object of recent work that is reviewed here. Increasing scientific evidence has been accumulated worldwide on ecosystem deterioration induced by the development of massive non-indigenous population outbreaks in many coastal sites. Biopollution assessment procedures have been proposed, adopting criteria already used for xenochemical compounds, adjusting them to deal with alien species invasions. On the other hand, prevention and mitigation measures to reduce biopollution impact cannot always mimic the emission countermeasures that have been successfully applied for chemical pollutants. Nevertheless, in order to design comprehensive water-quality criteria, risk assessment and management strategies, based on scientific knowledge, have been developed in a similar way as for chemical pollution. The Mediterranean Sea is a well-known case of alien species invasion, mainly linked to the opening of the Suez Canal. Non-indigenous species have caused well-documented changes in many coastal ecosystems, favoured by concomitant changes induced by global warming and by the heavy load of nutrients and pollutants by various anthropogenic activities. Naval commercial traffic and leisure boats are among the most active vectors of spread for alien species inside the Mediterranean, and also towards other ocean regions. The scientific evidence gathered and summarized in this review suggests that effective management actions, under a precautionary approach, should be put in place in order to control introductions of species in new areas. These management measures are already established in international treaties and national legislations, but should be enforced to prevent the disruption of the dynamic ecological equilibria in the receiving environment and to control the direct adverse effects of alien species.

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Invasion of alien macroalgae in the Venice Lagoon, a pest or a resource?

Cited by 27 publications

References 0 publications

Settlement and Spreading of the Introduced Seaweed Caulacanthus okamurae (Rhodophyta) in the Mediterranean Sea

Settlement and Spreading of the Introduced Seaweed Caulacanthus okamurae (Rhodophyta) in the Mediterranean Sea

Morphological and molecular assessment of Grateloupia (Halymeniales, Rhodophyta) from Egypt revealed a new introduced species in the Mediterranean Sea, Grateloupia gibbesii

Biopollution by Invasive Marine Non-Indigenous Species: A Review of Potential Adverse Ecological Effects in a Changing Climate

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