scholarly journals Low clonal propagation in Atlantic and Mediterranean populations of the red gorgonian Paramuricea clavata (Octocorallia)

2017 ◽  
Vol 81 (1) ◽  
pp. 103 ◽  
Author(s):  
Joanna Pilczynska ◽  
Joana Boavida ◽  
Silvia Cocito ◽  
Chiara Lombardi ◽  
Andrea Peirano ◽  
...  
Keyword(s):  
Clonal Propagation ◽  
Slow Growth ◽  
Clonal Reproduction ◽  
Mass Mortality ◽  
Ligurian Sea ◽  
Mediterranean Populations ◽  
High Recovery Rate ◽  
Paramuricea Clavata ◽  
Nw Mediterranean ◽  
Episodic Recruitment

Clonal propagation is a common feature of benthic marine organisms. In the present study, we investigated the contribution of clonal reproduction in the red gorgonian Paramuricea clavata. Mediterranean populations of P. clavata were severely affected by mass mortality events caused by increased water temperature in 1999 and 2003. The populations are characterized by slow growth and episodic recruitment, but after the observed mortalities, an unexpectedly high recovery rate was observed in the severely affected populations from the Ligurian Sea, NW Mediterranean. Ten years after the last mortality event, we investigated the contribution of clonal propagation in populations from the Ligurian Sea, where some populations were highly affected by mass mortality events, and from the Atlantic, where mortality was never observed. All individuals were genotyped for nine microsatellite loci. The contribution of clonal reproduction varied from 0% to 13% and did not differ significantly between affected and unaffected populations. We confirm by using genetic markers that clonal propagation in P. clavata is not common, and that the contribution of clones is too low to play an important role in red gorgonian reproduction and cannot contribute to population recovery at sites that have been affected by mass mortality events.

scholarly journals Updating the current knowledge on the relationships between Haplosyllis chamaeleon Laubier, 1960 (Annelida, Syllidae) and Paramuricea clavata (Risso, 1826) (Cnidaria, Plexauridae) in the Mediterranean Sea

2020 ◽  
Vol 50 (6) ◽  
Author(s):  
Lisa Pola ◽  
Barbara Calcinai ◽  
Daniela Pica ◽  
Cristina Gioia Di Camillo ◽  
Daniel Martin ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Current Knowledge ◽  
First Record ◽  
Reproductive Period ◽  
Central Basin ◽  
Western Basin ◽  
Ligurian Sea ◽  
Mediterranean Populations ◽  
Paramuricea Clavata ◽  
The Mediterranean

AbstractIn the Mediterranean Sea, the symbiosis between the gorgonian Paramuricea clavata (Risso, 1826) and the polychaete Haplosyllis chamaeleon Laubier, 1960 (Annelida, Syllidae, Syllinae) has only been documented from the western basin. Our findings extend its geographic distribution to the north-central basin and represent the first record of H. chamaeleon in Italy and Croatia. Periodic observations from the Ligurian Sea allowed establishing that the symbiont occurs on P. clavata almost throughout the year, showing a reproductive period longer than previously reported. Morphometric comparisons of three Mediterranean populations, from Portofino Promontory (Ligurian Sea), Cape of Creus (Catalan Sea) and Chafarinas Archipelago (Alboran Sea) proved that there were no significant differences in body measurements, whilst the observed differences in dorsal cirri length pattern could be consider intra-specific. Our behavioural observations confirm that the species had (i) a kleptoparasitic behaviour, (ii) did not cause injuries to the host and (iii) did not induce the host to generate any malformation.

Planktonic prokaryote and protist communities in a submarine canyon system in the Ligurian Sea (NW Mediterranean)

2018 ◽  
Vol 168 ◽  
pp. 210-221 ◽  
Author(s):  
Mauro Celussi ◽  
Grazia Marina Quero ◽  
Luca Zoccarato ◽  
Annalisa Franzo ◽  
Cinzia Corinaldesi ◽  
...  
Keyword(s):  
Submarine Canyon ◽  
Ligurian Sea ◽  
Nw Mediterranean

Drones as tools for monitoring beach topography changes in the Ligurian Sea (NW Mediterranean)

2016 ◽  
Vol 36 (2) ◽  
pp. 151-163 ◽  
Author(s):  
Elisa Casella ◽  
Alessio Rovere ◽  
Andrea Pedroncini ◽  
Colin P. Stark ◽  
Marco Casella ◽  
...  
Keyword(s):  
Ligurian Sea ◽  
Nw Mediterranean

scholarly journals Importance of the variability of hydrographic preconditioning for deep convection in the Gulf of Lion, NW Mediterranean

Ocean Science ◽  
2010 ◽  
Vol 6 (2) ◽  
pp. 573-586 ◽  
Author(s):  
L. Grignon ◽  
D. A. Smeed ◽  
H. L. Bryden ◽  
K. Schroeder
Keyword(s):  
Interannual Variability ◽  
Deep Convection ◽  
Mixed Layer Depth ◽  
Surface Fluxes ◽  
Ligurian Sea ◽  
Intermediate Layers ◽  
Gulf Of Lion ◽  
Nw Mediterranean ◽  
Convective Mixed Layer ◽  
Correlation Tests

Abstract. We study the variability of hydrographic preconditioning defined as the heat and salt contents in the Ligurian Sea before convection. The stratification is found to reach a maximum in the intermediate layer in December, whose causes and consequences for the interannual variability of convection are investigated. Further study of the interannual variability and correlation tests between the properties of the deep water formed and the winter surface fluxes support the description of convection as a process that transfers the heat and salt contents from the top and intermediate layers to the deep layer. A proxy for the rate of transfer is given by the final convective mixed layer depth, that is shown to depend equally on the surface fluxes and on the preconditioning. In particular, it is found that deep convection in winter 2004–2005 would have happened even with normal winter conditions, due to low pre-winter stratification.

scholarly journals Importance of the variability of hydrographic preconditioning for deep convection in the Gulf of Lion, NW Mediterranean

2010 ◽  
Vol 7 (1) ◽  
pp. 51-90
Author(s):  
L. Grignon ◽  
D. A. Smeed ◽  
H. L. Bryden ◽  
K. Schroeder
Keyword(s):  
Interannual Variability ◽  
Deep Convection ◽  
Mixed Layer Depth ◽  
Surface Fluxes ◽  
Ligurian Sea ◽  
Intermediate Layers ◽  
Gulf Of Lion ◽  
Nw Mediterranean ◽  
Convective Mixed Layer ◽  
Correlation Tests

Abstract. We study the variability of hydrographic preconditioning defined as the heat and salt contents in the Ligurian Sea before convection. The stratification is found to reach a maximum in the intermediate layer in December, whose causes and consequences for the interannual variability of convection are investigated. Further study of the interannual variability and correlation tests between the properties of the deep water formed and the winter surface fluxes support the description of convection as a process that transfers the heat and salt contents from the top and intermediate layers to the deep layer. A proxy for the rate of transfer is given by the final convective mixed layer depth, that is shown to depend equally on the surface fluxes and on the preconditioning. In particular, it was found that deep convection in winter 2004–2005 would have happened even with normal winter conditions, due to low pre-winter stratification.

scholarly journals Midwater tunicates: are they related to the permanent front of the Ligurian Sea (NW Mediterranean)?

1991 ◽  
Vol 74 ◽  
pp. 195-204 ◽  
Author(s):  
G Gorsky ◽  
N Lins da Silva ◽  
S Dallot ◽  
Ph Laval ◽  
JC Braconnot ◽  
...  
Keyword(s):  
Ligurian Sea ◽  
Nw Mediterranean

Seawater warming at the northern reach for southern species: Gulf of Genoa, NW Mediterranean

2017 ◽  
Vol 98 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Carlo Nike Bianchi ◽  
Francesco Caroli ◽  
Paolo Guidetti ◽  
Carla Morri
Keyword(s):  
Mediterranean Sea ◽  
Native Species ◽  
Indigenous Species ◽  
Ligurian Sea ◽  
The North ◽  
Nw Mediterranean ◽  
The Mediterranean ◽  
Non Indigenous Species ◽  
Southern Species ◽  
North Western

Global warming is facilitating the poleward range expansion of plant and animal species. In the Mediterranean Sea, the concurrent temperature increase and abundance of (sub)tropical non-indigenous species (NIS) is leading to the so-called ‘tropicalization’ of the Mediterranean Sea, which is dramatically evident in the south-eastern sectors of the basin. At the same time, the colder north-western sectors of the basin have been said to undergo a process of ‘meridionalization’, that is the establishment of warm-water native species (WWN) previously restricted to the southern sectors. The Gulf of Genoa (Ligurian Sea) is the north-western reach for southern species of whatever origin in the Mediterranean. Recent (up to 2015) observations of NIS and WWN by diving have been collated to update previous similar inventories. In addition, the relative occurrences of both groups of southern species have been monitored by snorkelling between 2009 and 2015 in shallow rocky reefs at Genoa, and compared with the trend in air and sea surface temperatures. A total of 20 southern species (11 NIS and 9 WWN) was found. Two WWN (the zebra seabream Diplodus cervinus and the parrotfish Sparisoma cretense) and three NIS (the SW Atlantic sponge Paraleucilla magna, the Red Sea polychaete Branchiomma luctuosum, and the amphi-American and amphi-Atlantic crab Percnon gibbesi) are new records for the Ligurian Sea, whereas juveniles of the Indo-Pacific bluespotted cornetfish Fistularia commersonii have been found for the first time. While temperature has kept on increasing for the whole period, with 2014 and 2015 being the warmest years since at least 1950, the number of WWN increased linearly, that of NIS increased exponentially, contradicting the idea of meridionalization and supporting that of tropicalization even in the northern sectors of the Mediterranean basin.

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