Elective affinities or random choice within the seagrass holobiont? The case of the native Posidonia oceanica (L.) Delile and the exotic Halophila stipulacea (Forssk.) Asch. from the same site (Limassol, Cyprus)

2021 ◽  
pp. 103420
Author(s):  
Chiara Conte ◽  
Alice Rotini ◽  
Gidon Winters ◽  
Marlen I. Vasquez ◽  
Giulia Piazza ◽  
...  
Keyword(s):  
Posidonia Oceanica ◽  
Random Choice ◽  
Halophila Stipulacea ◽  
Elective Affinities

scholarly journals Restoration of Seagrass Meadows in the Mediterranean Sea: A Critical Review of Effectiveness and Ethical Issues

Water ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1034
Author(s):  
Charles-François Boudouresque ◽  
Aurélie Blanfuné ◽  
Gérard Pergent ◽  
Thierry Thibaut
Keyword(s):  
Ethical Issues ◽  
Scientific Paper ◽  
Posidonia Oceanica ◽  
Natural Ecosystem ◽  
Seagrass Meadows ◽  
Halophila Stipulacea ◽  
The Mediterranean ◽  
Term Monitoring ◽  
Sea Warming

Some species of seagrasses (e.g., Zostera marina and Posidonia oceanica) have declined in the Mediterranean, at least locally. Others are progressing, helped by sea warming, such as Cymodocea nodosa and the non-native Halophila stipulacea. The decline of one seagrass can favor another seagrass. All in all, the decline of seagrasses could be less extensive and less general than claimed by some authors. Natural recolonization (cuttings and seedlings) has been more rapid and more widespread than was thought in the 20th century; however, it is sometimes insufficient, which justifies transplanting operations. Many techniques have been proposed to restore Mediterranean seagrass meadows. However, setting aside the short-term failure or half-success of experimental operations, long-term monitoring has usually been lacking, suggesting that possible failures were considered not worthy of a scientific paper. Many transplanting operations (e.g., P. oceanica) have been carried out at sites where the species had never previously been present. Replacing the natural ecosystem (e.g., sandy bottoms, sublittoral reefs) with P. oceanica is obviously inappropriate in most cases. This presupposes ignorance of the fact that the diversity of ecosystems is one of the bases of the biodiversity concept. In order to prevent the possibility of seagrass transplanting from being misused as a pretext for further destruction, a guide for the proper conduct of transplanting is proposed.

scholarly journals Seagrass meadows of the Moroccan Mediterranean coast: state of research and knowledge

2015 ◽  
Author(s):  
Hocein Bazairi
Keyword(s):  
Zostera Marina ◽  
Posidonia Oceanica ◽  
Mediterranean Coast ◽  
Field Surveys ◽  
Seagrass Meadows ◽  
Halophila Stipulacea ◽  
Depth Study ◽  
The Mediterranean ◽  
State Of Research ◽  
Large Distribution

Seagrass meadows are highly productive and key ecosystems that undergo widespread loss due to ‘climate-related’ and human-mediated stressors as well as natural causes. Therefore, basic information about the distribution, abundance, and characteristics of seagrass meadows and their environment is critical for managers to assess and monitor the resource. Such knowledge is lacking for Morocco and there is a clear need to acquire baseline data for monitoring and protecting these important habitats. The present review summarizes the state of the research and the knowledge on seagrass meadows of the Mediterranean coast of Morocco. Data were assessed using a compilation of historical data compared to recent confirmed observation and field surveys conducted within the framework of several projects (MedMPAnet, Medkeyhabitats, etc.). Of the five species of strictly marine Magnoliophyta found in the Mediterranean Sea, four are also currently identified along the Mediterranean coast of Morocco (Posidonia oceanica, Cymodocea nodosa, Zostera marina and Zostera noltii); the Lessepsian immigrant Halophila stipulacea has not been recorded yet. Apart from C. nodosa, that showed large distribution, the other species remain spatially localized and their distribution has been declining since they have disappeared from many localities. This is the case of Zostera marina that has probably disappeared from many localities (e.g. Cap des Trois Fourches, Marchica lagoon). However, some previous citations, such as the presence of Posidonia oceanica in the Marchica lagoon, seem to be a systematic confusion. Moreover, quantitative data on the characteristics of seagrass meadows are very scarce and many areas of knowledge gaps were identified along the Mediterranean coast of Morocco. An in-depth study of seagrass meadows occurring in Morocco is strongly required and would substantially increase the knowledge on such habitats and help in their conservation.

scholarly journals Seagrass meadows of the Moroccan Mediterranean coast: state of research and knowledge

2015 ◽  
Author(s):  
Hocein Bazairi
Keyword(s):  
Zostera Marina ◽  
Posidonia Oceanica ◽  
Mediterranean Coast ◽  
Field Surveys ◽  
Seagrass Meadows ◽  
Halophila Stipulacea ◽  
Depth Study ◽  
The Mediterranean ◽  
State Of Research ◽  
Large Distribution

Seagrass meadows are highly productive and key ecosystems that undergo widespread loss due to ‘climate-related’ and human-mediated stressors as well as natural causes. Therefore, basic information about the distribution, abundance, and characteristics of seagrass meadows and their environment is critical for managers to assess and monitor the resource. Such knowledge is lacking for Morocco and there is a clear need to acquire baseline data for monitoring and protecting these important habitats. The present review summarizes the state of the research and the knowledge on seagrass meadows of the Mediterranean coast of Morocco. Data were assessed using a compilation of historical data compared to recent confirmed observation and field surveys conducted within the framework of several projects (MedMPAnet, Medkeyhabitats, etc.). Of the five species of strictly marine Magnoliophyta found in the Mediterranean Sea, four are also currently identified along the Mediterranean coast of Morocco (Posidonia oceanica, Cymodocea nodosa, Zostera marina and Zostera noltii); the Lessepsian immigrant Halophila stipulacea has not been recorded yet. Apart from C. nodosa, that showed large distribution, the other species remain spatially localized and their distribution has been declining since they have disappeared from many localities. This is the case of Zostera marina that has probably disappeared from many localities (e.g. Cap des Trois Fourches, Marchica lagoon). However, some previous citations, such as the presence of Posidonia oceanica in the Marchica lagoon, seem to be a systematic confusion. Moreover, quantitative data on the characteristics of seagrass meadows are very scarce and many areas of knowledge gaps were identified along the Mediterranean coast of Morocco. An in-depth study of seagrass meadows occurring in Morocco is strongly required and would substantially increase the knowledge on such habitats and help in their conservation.

Variability of foraminifera associations in seagrass ecosystems in shallow water during winter (Kerkennah – Southern Tunisian coasts)

2017 ◽  
Vol 98 (8) ◽  
pp. 1945-1954 ◽  
Author(s):  
Raida Trabelsi ◽  
Jannet Elloumi ◽  
Asma Hamza ◽  
Najla Ayadi ◽  
Ihsen Zghal ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Benthic Foraminifera ◽  
Statistical Study ◽  
Environmental Parameters ◽  
Posidonia Oceanica ◽  
Cymodocea Nodosa ◽  
Seagrass Species ◽  
Halophila Stipulacea ◽  
Seagrass Ecosystem ◽  
Seagrass Ecosystems

This study intends to reliably estimate the general status of the benthic and the epiphytic foraminifera community related to each studied seagrass ecosystem (Posidonia oceanica,Cymodocea nodosaandHalophila stipulacea) distributed in different shallow sites in the coastal archipelago of Kerkennah (Gulf of Gabes, Tunisia) during winter. We were able to first sort and subsequently identify some characteristics conditioning their behaviour. Twenty-four species of foraminifera were encountered. Among them, three epiphytic species identified on these seagrass leaves had a much lower abundance than those in the sediment. We were interested in highlighting the foraminiferal community related toHalophila stipulacea, since this seagrass species is newly introduced into the Mediterranean sea. Thanks to the statistical study, we were able to identify the favourable habitat for epiphytic and benthic foraminifera among the three seagrass ecosystems. A correlation between the identified foraminifera species and some environmental parameters was addressed using a variety of software.

scholarly journals Distribution and seasonality of the marine macrophytes from Antikyra Gulf (Viotia, Greece)

2001 ◽  
Vol 2 (1) ◽  
pp. 79
Author(s):  
P. MALEA ◽  
S. HARITONIDIS
Keyword(s):  
Posidonia Oceanica ◽  
Qualitative Composition ◽  
Cymodocea Nodosa ◽  
Halophila Stipulacea ◽  
Marine Macrophytes ◽  
First Time

The Gulf of Antikyra (Viotia) with a bauxitic substrate was aggravated by wastes discharged from an Aluminium factory where the Parnassos bauxite is treated Seasonal collections of macrophytes from stations selected inside the Antikyra Gulf were carried out. 85 species of macroalgae were totally collected, out of which 16 belonged to Chlorophyceae, 12 to Phaeophyceae and 57 to Rhodophyceae. There has been no obvious difference in the qualitative composition of the macroalgae as we move away from the area where the wastes are being discharged. Moreover, the stations where depths are greater exhibit different qualitative composition that those with smaller depths. The presence of phanerogams and especially that of Halophila stipulacea, the Lessepsian immigrant, encountered for the first time in the Korinthiakos Gulf, was also evident. The biomass of the three phanerogams decreased with the order: Posidonia oceanica>Cymodocea nodosa>Halophila stipulacea. The biomass of C. nodosaand P. oceanica was higher in July, while that of H. stipulacea was lower in July and higher in March and September.

Depth-induced adjustment of fatty acid and pigment composition suggests high biochemical plasticity in the tropical seagrass Halophila stipulacea

2019 ◽  
Vol 608 ◽  
pp. 105-117 ◽  
Author(s):  
P Beca-Carretero ◽  
F Guihéneuf ◽  
G Winters ◽  
DB Stengel
Keyword(s):  
Fatty Acid ◽  
Pigment Composition ◽  
Halophila Stipulacea

Costly Information and Random Choice

2019 ◽  
Author(s):  
Jetlir Duraj ◽  
Yi-Hsuan Lin
Keyword(s):  
Random Choice ◽  
Costly Information
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