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3. Unpublished Mediterranean and Black Sea records of marine alien, cryptogenic, and neonative species

Author

Universidad de Alicante. Departamento de Ciencias del Mar y Biología Aplicada, Ragkousis, Michail, Zenetos, Argyro, Ben Souissi, Jamila, Hoffman, Razy, Ghanem, Raouia, Taşkın, Ergün, Muresan, Mihaela, Karpova, Evgeniia, Slynko, Elena, Dağlı, Ertan, Fortič, Ana, Surugiu, Victor, Mačić, Vesna, Trkov, Domen, Rjiba Bahri, Wafa, Tsiamis, Konstantinos, Ramos-Esplá, Alfonso A., Petović, Slavica, Ferrario, Jasmine, Marchini, Agnese, Sconfietti, Renato, Ammar, Izdihar, Alo, Alaa, Edelist, Dori, Begun, Tatiana, Teaca, Adrian, Tari, Gokhan, Huseyinoglu, Mehmet Fatih, Karachle, Paraskevi K., Dogrammatzi, Aikaterini, Apostolopoulos, Giorgos A., Crocetta, Fabio, Kytinou, Eleni, Digenis, Markos, Skouradakis, Grigorios, Tomas, Fiona, Bariche, Michel, Kaminas, Alexandros, Konida, Kassiani, Deidun, Alan, Marrone, Alessio, Fraschetti, Simonetta, Mihneva, Vesselina, Bianchi, Carlo Nike, Morri, Carla, Gerovasileiou, Vasilis, Lipej, Lovrenc, Sini, Maria, Mangialajo, Luisa, Zotou, Maria, Skolka, Marius, Azzurro, Ernesto, Vella, Adriana, Dailianis, Thanos, Grigoriou, Panos, Jimenez, Carlos, Tsirintanis, Konstantinos, Oikonomidis, Georgios, Mancini, Emanuele, Papadakis, Orestis, Martino, Vincenzo Di, Chatzigeorgiou, Giorgos, Ben Amor, Mohamed Mourad, Vernadou, Emmanouela, Arda, Yaprak, Minasidis, Vasileios, Azzola, Annalisa, Hadjioannou, Louis, Montefalcone, Monica, Baldacchino, Yacopo, Stancanelli, Bessy, Bonifazi, Andrea, Occhipinti-Ambrogi, Anna, Smeraldo, Sonia, Evans, Julian, Kondylatos, Gerasimos, Falautano, Manuela, Castriota, Luca, Lamprou, Aggelos, Rizgalla, Jamila, Mavrič, Borut, Papadimitriou, Evangelos, Kersting, Diego K., Schembri, Patrick J., Khamassi, Faten, Nikolaou, Athanasios, Ballesteros, Enric, Dimitriadis, Charalampos, García, María, Anastasiadis, Athanasios, Kalogirou, Stefanos, Nalmpanti, Melina, Altamirano, María, Grech, Daniele, Mavrouleas, Dimitrios, Vella, Noel, Darmanin, Sandra Agius, Dragičević, Branko, Poursanidis, Dimitris, Tsatiris, Alexandros, Corsini-Foka, Maria, Orlando-Bonaca, Martina, Insacco, Gianni, Tsalapatis, Alexandros, Scannella, Danilo, Tiralongo, Francesco, Verdura, Jana, Vitale, Sergio, Valsamidis, MichailAggelos, Bazairi, Hocein, Mannino, Anna Maria, Virgili, Riccardo, Coccia, Fabio Collepardo, El Zrelli, Radhouan, Nikolidakis, Savvas, Rabaoui, Lotfi Jilani, Yapıcı, Sercan, Zaouali, Jeanne, Zava, Bruno, Agrotis, Neophytos, Bilecenoglu, Murat, Çinar, Melih Ertan, Moraitis, Manos L., Albano, Paolo G., Kaddouri, Nassir, Kosma, Ioanna, Falsone, Fabio, Fossati, Valentina, Geraci, Michele Luca, Zamuda, Leon Lojze, Mancuso, Francesco Paolo, Petrou, Antonis, Resaikos, Vasilis, Aydın, İlker, Batjakas, Ioannis E., Bos, Arthur R., El Ouamari, Najib, Giallongo, Giovanni, Kampouris, Thodoros E., Ounifi-Ben Amor, Khadija, Doğan, Alper, Dulčić, Jakov, Şükran Okudan, Emine, Rilov, Gil, Rosso, Antonietta, Royo, Laura, Selfati, Mohamed, Gaglioti, Martina, Giakoumi, Sylvaine, Kousteni, Vasiliki, Micu, Dragoș, Nicoară, Mircea, Orfanidis, Sotiris, Papatheodoulou, Magdalene, Tempesti, Jonathan, Triantaphyllou, Maria, Tsourou, Theodora, Yalgın, Ferhat, Baltag, Emanuel, Cerim, Hasan, Filiz, Halit, Georgiadis, Constantinos G., Papadamakis, Paschalis, Rammou, Dimitra Lida, Samargiu, Manuela Diana, Sciuto, Francesco, Sinopoli, Mauro, Türker, Ali, Chiarore, Antonia, Tamburello, Laura, Karray, Sahar, Hassen, Bilel, Katsanevakis, Stelios, Universidad de Alicante. Departamento de Ciencias del Mar y Biología Aplicada, Ragkousis, Michail, Zenetos, Argyro, Ben Souissi, Jamila, Hoffman, Razy, Ghanem, Raouia, Taşkın, Ergün, Muresan, Mihaela, Karpova, Evgeniia, Slynko, Elena, Dağlı, Ertan, Fortič, Ana, Surugiu, Victor, Mačić, Vesna, Trkov, Domen, Rjiba Bahri, Wafa, Tsiamis, Konstantinos, Ramos-Esplá, Alfonso A., Petović, Slavica, Ferrario, Jasmine, Marchini, Agnese, Sconfietti, Renato, Ammar, Izdihar, Alo, Alaa, Edelist, Dori, Begun, Tatiana, Teaca, Adrian, Tari, Gokhan, Huseyinoglu, Mehmet Fatih, Karachle, Paraskevi K., Dogrammatzi, Aikaterini, Apostolopoulos, Giorgos A., Crocetta, Fabio, Kytinou, Eleni, Digenis, Markos, Skouradakis, Grigorios, Tomas, Fiona, Bariche, Michel, Kaminas, Alexandros, Konida, Kassiani, Deidun, Alan, Marrone, Alessio, Fraschetti, Simonetta, Mihneva, Vesselina, Bianchi, Carlo Nike, Morri, Carla, Gerovasileiou, Vasilis, Lipej, Lovrenc, Sini, Maria, Mangialajo, Luisa, Zotou, Maria, Skolka, Marius, Azzurro, Ernesto, Vella, Adriana, Dailianis, Thanos, Grigoriou, Panos, Jimenez, Carlos, Tsirintanis, Konstantinos, Oikonomidis, Georgios, Mancini, Emanuele, Papadakis, Orestis, Martino, Vincenzo Di, Chatzigeorgiou, Giorgos, Ben Amor, Mohamed Mourad, Vernadou, Emmanouela, Arda, Yaprak, Minasidis, Vasileios, Azzola, Annalisa, Hadjioannou, Louis, Montefalcone, Monica, Baldacchino, Yacopo, Stancanelli, Bessy, Bonifazi, Andrea, Occhipinti-Ambrogi, Anna, Smeraldo, Sonia, Evans, Julian, Kondylatos, Gerasimos, Falautano, Manuela, Castriota, Luca, Lamprou, Aggelos, Rizgalla, Jamila, Mavrič, Borut, Papadimitriou, Evangelos, Kersting, Diego K., Schembri, Patrick J., Khamassi, Faten, Nikolaou, Athanasios, Ballesteros, Enric, Dimitriadis, Charalampos, García, María, Anastasiadis, Athanasios, Kalogirou, Stefanos, Nalmpanti, Melina, Altamirano, María, Grech, Daniele, Mavrouleas, Dimitrios, Vella, Noel, Darmanin, Sandra Agius, Dragičević, Branko, Poursanidis, Dimitris, Tsatiris, Alexandros, Corsini-Foka, Maria, Orlando-Bonaca, Martina, Insacco, Gianni, Tsalapatis, Alexandros, Scannella, Danilo, Tiralongo, Francesco, Verdura, Jana, Vitale, Sergio, Valsamidis, MichailAggelos, Bazairi, Hocein, Mannino, Anna Maria, Virgili, Riccardo, Coccia, Fabio Collepardo, El Zrelli, Radhouan, Nikolidakis, Savvas, Rabaoui, Lotfi Jilani, Yapıcı, Sercan, Zaouali, Jeanne, Zava, Bruno, Agrotis, Neophytos, Bilecenoglu, Murat, Çinar, Melih Ertan, Moraitis, Manos L., Albano, Paolo G., Kaddouri, Nassir, Kosma, Ioanna, Falsone, Fabio, Fossati, Valentina, Geraci, Michele Luca, Zamuda, Leon Lojze, Mancuso, Francesco Paolo, Petrou, Antonis, Resaikos, Vasilis, Aydın, İlker, Batjakas, Ioannis E., Bos, Arthur R., El Ouamari, Najib, Giallongo, Giovanni, Kampouris, Thodoros E., Ounifi-Ben Amor, Khadija, Doğan, Alper, Dulčić, Jakov, Şükran Okudan, Emine, Rilov, Gil, Rosso, Antonietta, Royo, Laura, Selfati, Mohamed, Gaglioti, Martina, Giakoumi, Sylvaine, Kousteni, Vasiliki, Micu, Dragoș, Nicoară, Mircea, Orfanidis, Sotiris, Papatheodoulou, Magdalene, Tempesti, Jonathan, Triantaphyllou, Maria, Tsourou, Theodora, Yalgın, Ferhat, Baltag, Emanuel, Cerim, Hasan, Filiz, Halit, Georgiadis, Constantinos G., Papadamakis, Paschalis, Rammou, Dimitra Lida, Samargiu, Manuela Diana, Sciuto, Francesco, Sinopoli, Mauro, Türker, Ali, Chiarore, Antonia, Tamburello, Laura, Karray, Sahar, Hassen, Bilel, and Katsanevakis, Stelios

Abstract

To enrich spatio-temporal information on the distribution of alien, cryptogenic, and neonative species in the Mediterranean and the Black Sea, a collective effort by 173 marine scientists was made to provide unpublished records and make them open access to the scientific community. Through this effort, we collected and harmonized a dataset of 12,649 records. It includes 247 taxa, of which 217 are Animalia, 25 Plantae and 5 Chromista, from 23 countries surrounding the Mediterranean and the Black Sea. Chordata was the most abundant taxonomic group, followed by Arthropoda, Mollusca, and Annelida. In terms of species records, Siganus luridus, Siganus rivulatus, Saurida lessepsianus, Pterois miles, Upeneus moluccensis, Charybdis (Archias) longicollis, and Caulerpa cylindracea were the most numerous. The temporal distribution of the records ranges from 1973 to 2022, with 44% of the records in 2020–2021. Lethrinus borbonicus is reported for the first time in the Mediterranean Sea, while Pomatoschistus quagga, Caulerpa cylindracea, Grateloupia turuturu, and Misophria pallida are first records for the Black Sea; Kapraunia schneideri is recorded for the second time in the Mediterranean and for the first time in Israel; Prionospio depauperata and Pseudonereis anomala are reported for the first time from the Sea of Marmara. Many first country records are also included, namely: Amathia verticillata (Montenegro), Ampithoe valida (Italy), Antithamnion amphigeneum (Greece), Clavelina oblonga (Tunisia and Slovenia), Dendostrea cf. folium (Syria), Epinephelus fasciatus (Tunisia), Ganonema farinosum (Montenegro), Macrorhynchia philippina (Tunisia), Marenzelleria neglecta (Romania), Paratapes textilis (Tunisia), and Botrylloides diegensis (Tunisia).

Published
2023

5. Unpublished Mediterranean and Black Sea records of marine alien, cryptogenic, and neonative species

Author

Ragkousis, Michail, Zenetos, Argyro, Souissi, Jamila Ben, Hoffman, Razy, Ghanem, Raouia, Taşkın, Ergün, Muresan, Mihaela, Karpova, Evgeniia, Slynko, Elena, Dağlı, Ertan, Fortič, Ana, Dulčić, Jakov, Dogrammatzi, Aikaterini, Şükran Okudan, Emine, Rilov, Gil, Rosso, Antonietta, Bianchi, Carlo Nike, Royo, Laura, Selfati, Mohamed, Gaglioti, Martina, Giakoumi, Sylvaine, Tsirintanis, Konstantinos, Kousteni, Vasiliki, Tsiamis, Konstantinos, Micu, Dragoș, Apostolopoulos, Giorgos A., Nicoară, Mircea, Orfanidis, Sotiris, Morri, Carla, Papatheodoulou, Magdalene, Tempesti, Jonathan, Triantaphyllou, Maria, Insacco, Gianni, Tsourou, Theodora, Yalgın, Ferhat, Baltag, Emanuel, Cerim, Hasan, Ramos-Espl, Alfonso A., Crocetta, Fabio, Filiz, Halit, Gerovasileiou, Vasilis, Georgiadis, Constantinos G., Papadamakis, Paschalis, Oikonomidis, Georgios, Rammou, Dimitra Lida, Samargiu, Manuela Diana, Sciuto, Francesco, Sinopoli, Mauro, Türker, Ali, Chiarore, Antonia, Tamburello, Laura, Kytinou, Eleni, Lipej, Lovrenc, Petović, Slavica, Mancini, Emanuele, Karray, Sahar, Hassen, Bilel, Katsanevakis, Stelios, Ferrario, Jasmine, Marchini, Agnese, Sconfietti, Renato, Ammar, Izdihar, Alo, Alaa, Edelist, Dori, Orlando- Bonaca, Martina, Papadakis, Orestis, Digenis, Markos, Begun, Tatiana, Teaca, Adrian, Tari, Gokhan, Skouradakis, Grigorios, Tomas, Fiona, Bariche, Michel, Corsini-Foka, Maria, Kaminas, Alexandros, Konida, Kassiani, Yapıcı, Sercan, Sini, Maria, Deidun, Alan, Marrone, Alessio, Fraschetti, Simonetta, Mangialajo, Luisa, Zotou, Maria, Skolka, Marius, Rabaoui, Lotfi Jilani, Azzurro, Ernesto, Vella, Adriana, Di Martino, Vincenzo, Dailianis, Thanos, Grigoriou, Panos, Jimenez, Carlos, Chatzigeorgiou, Giorgos, Ben Amor, Mohamed Mourad, Vernadou, Emmanouela, Zamuda, Leon Lojze, Arda, Yaprak, Minasidis, Vasileios, Azzola, Annalisa, Tsalapatis, Alexandros, Hadjioannou, Louis, Montefalcone, Monica, Zaouali, Jeanne, Baldacchino, Yacopo, Stancanelli, Bessy, Bonifazi, Andrea, Trkov, Domen, Occhipinti-Ambrogi, Anna, Smeraldo, Sonia, Evans, Julian, Kondylatos, Gerasimos, Falautano, Manuela, Scannella, Danilo, Castriota, Luca, Zava, Bruno, Lamprou, Aggelos, Rizgalla, Jamila, Mancuso, Francesco Paolo, Mavrič, Borut, Papadimitriou, Evangelos, Kersting, Diego K., Schembri, Patrick J., Khamassi, Faten, Nikolaou, Athanasios, Ballesteros, Enric, Tiralongo, Francesco, Agrotis, Neophytos, Dimitriadis, Charalampos, Petrou, Antonis, García, María, Anastasiadis, Athanasios, Kalogirou, Stefanos, Nalmpanti, Melina, Altamirano, María, Grech, Daniele, Mavrouleas, Dimitrios, Vella, Noel, Agius Darmanin, Sandra, Mačić, Vesna, Resaikos, Vasilis, Verdura, Jana, Dragičević, Branko, Poursanidis, Dimitris, Tsatiris, Alexandros, Vitale, Sergio, Valsamidis, Michail-Aggelos, Bazairi, Hocein, Surugiu, Victor, Mannino, Anna Maria, Virgili, Riccardo, Karachle, Paraskevi K., Bilecenoglu, Murat, Collepardo Coccia, Fabio, El Zrelli, Radhouan, Nikolidakis, Savvas, Ertan Çinar, Melih, Moraitis, Manos L., Albano, Paolo G., Huseyinoglu, Mehmet Fatih, Kaddouri, Nassir, Kosma, Ioanna, Aydın, İlker, Falsone, Fabio, Fossati, Valentina, Geraci, Michele Luca, Batjakas, Ioannis E., Bos, Arthur R., El Ouamari, Najib, Mihneva, Vesselina, Giallongo, Giovanni, Kampouris, Thodoros E., Ounifi-Ben Amor, Khadija, Bahri, Wafa Rjiba, and Doğan, Alper

Subjects
Introduced organisms -- Mediterranean Sea, Marine animals -- Mediterranean Sea, Marine animals -- Black Sea, Climatic changes -- Black Sea Region, Climatic changes -- Mediterranean Region, Introduced organisms -- Black Sea
Abstract

To enrich spatio-temporal information on the distribution of alien, cryptogenic, and neonative species in the Mediterranean and the Black Sea, a collective effort by 173 marine scientists was made to provide unpublished records and make them open access to the scientific community. Through this effort, we collected and harmonized a dataset of 12,649 records. It includes 247 taxa, of which 217 are Animalia, 25 Plantae and 5 Chromista, from 23 countries surrounding the Mediterranean and the Black Sea. Chordata was the most abundant taxonomic group, followed by Arthropoda, Mollusca, and Annelida. In terms of species records, Siganus luridus, Siganus rivulatus, Saurida lessepsianus, Pterois miles, Upeneus moluccensis, Charybdis (Archias) longicollis, and Caulerpa cylindracea were the most numerous. The temporal distribution of the records ranges from 1973 to 2022, with 44% of the records in 2020–2021. Lethrinus borbonicus is reported for the first time in the Mediterranean Sea, while Pomatoschistus quagga, Caulerpa cylindracea, Grateloupia turuturu, and Misophria pallida are first records for the Black Sea; Kapraunia schneideri is recorded for the second time in the Mediterranean and for the first time in Israel; Prionospio depauperata and Pseudonereis anomala are reported for the first time from the Sea of Marmara. Many first country records are also included, namely: Amathia verticillata (Montenegro), Ampithoe valida (Italy), Antithamnion amphigeneum (Greece), Clavelina oblonga (Tunisia and Slovenia), Dendostrea cf. folium (Syria), Epinephelus fasciatus (Tunisia), Ganonema farinosum (Montenegro), Macrorhynchia philippina (Tunisia), Marenzelleria neglecta (Romania), Paratapes textilis (Tunisia), and Botrylloides diegensis (Tunisia)., peer-reviewed

Published
2023

10. Ecotoxicology and phylogeography studies of the cockle Cerastoderma glaucum from the gulf of Gabès : adaptive response (in situ and in vivo) to metal stress and genetic structure

Author

Karray, Sahar, Mer, molécules et santé EA 2160 (MMS), Le Mans Université (UM)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Université de Nantes - UFR des Sciences Pharmaceutiques et Biologiques, Université de Nantes (UN)-Université de Nantes (UN), Université du Maine, Benoît Chénais, Amel Hamza-Chaffai, STAR, ABES, and Le Mans Université (UM)-Université de Nantes - UFR des Sciences Pharmaceutiques et Biologiques

Subjects
Controlled conditions, Biomarqueurs, Milieu naturel, [SDV.TOX.ECO] Life Sciences [q-bio]/Toxicology/Ecotoxicology, Conditions contrôlées, Cerastoderma glaucum, Golfe de Gabès, Phylogéographie, Ecotoxicology, Ecotoxicologie, Western Mediterranean sea, Phylogéography, Natural conditions, [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology, Biomarkers, Méditerranée occidentale
Abstract

Cerastoderma glaucum is an adequate biological model for phylogeographic and ecotoxicological studies.A study of its genetic structure in the Western Mediterranean sea was conducted using two markers types: mitochondrial and nuclear. The DNA mitochondrial marker results show a divergent population from all the other ones (Ellouza South ofTunisia).An ecotoxicological study of populations sampled from Ellouza site and two other nearby sites in the Gulf of Gabes region was carried out in order to study the adaptive response of natural populations of C. glaucum at different levels of biological organization from the individual level to the cellular and molecular ones. In parallel, two laboratory experiments were performed to clarify the mechanisms that may explain the success or failure of maintaining populations of C. glaucum. In thefirst one, industrial effluents were used and in the second we have used a pure contaminant, the cadmium. These studies experiments concerned individual and molecular levels. Different biomarkers involved in the response to different types of stress: (MT), (ABCB1) (MnSOD and CuZnSOD) (CAT) (HSP70) and (COI) were used in natural and exposed cockles.Results showed the importance of energy metabolism in response to stress whatever the used approach (in situ / Experimental) through the regulation of the expression of the COI gene., Cerastoderma glaucum est un modèle biologique de choix pour des études phylogéographiques et écotoxicologiques.Une étude de sa structure génétique en méditerranée occidentale a été réalisée en utilisant deux types de marqueurs, mitochondrial et nucléaire. Les résultats obtenus ont révélé à travers l’ADN mitochondrial une population très divergente de toutes les autres populations (Ellouza, Sud de la Tunisie).Une étude écotoxicologique sur des populations issues de ce site Ellouza et deux autres sites à proximité dans la région du golfe de Gabès a été réalisée dans le but d’étudier la réponse adaptative des populations de la coque C. glaucum en milieu naturel à différents niveaux de l’organisation biologique allant du niveau individuel jusqu’au niveau cellulaire et moléculaire. En parallèle à cette étude, deux expérimentations en laboratoire ont été réalisées afin de préciser les mécanismes pouvant expliquer le succès ou l’échec du maintien des populations de C. glaucum. La première expérimentation a été réalisée en utilisant des effluents industriels et la deuxième en utilisant un contaminant pur le cadmium. Les niveaux de l’organisationbiologique concernés par cette étude étaient le niveau individuel et le niveau moléculaire. Différents biomarqueurs impliqués dans la réponse à différents types de stress : (MT), (ABCB1), (MnSOD et CuZnSOD), (CAT), (HSP70) et (COI) ont été utilisés en milieu naturel ainsi qu’en conditions contrôlées et les résultats obtenus ont montré l’importance dumétabolisme énergétique dans la réponse au stress quelque soit l’approche utilisée (in situ/ expérimental) à travers la régulation de l’expression du gène COI.

Published
2015

13. Transcriptional response of stress-regulated genes to cadmium exposure in the cockle Cerastoderma glaucum from the gulf of Gabès area (Tunisia)

Author

Karray, Sahar, primary, Marchand, Justine, additional, Moreau, Brigitte, additional, Tastard, Emmanuelle, additional, Thiriet-Rupert, Stanislas, additional, Geffard, Alain, additional, Delahaut, Laurence, additional, Denis, Françoise, additional, Hamza-Chaffai, Amel, additional, and Chénais, Benoît, additional

Published
2014
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15. Transcriptional response of stress-regulated genes to cadmium exposure in the cockle Cerastoderma glaucum from the gulf of Gabès area (Tunisia).

Author

Karray, Sahar, Marchand, Justine, Moreau, Brigitte, Tastard, Emmanuelle, Thiriet-Rupert, Stanislas, Geffard, Alain, Delahaut, Laurence, Denis, Françoise, Hamza-Chaffai, Amel, and Chénais, Benoît

Subjects
CERASTODERMA, MESSENGER RNA, GENETIC transcription, POLYMERASE chain reaction, METABOLIC detoxification
Abstract

This study investigates cadmium effects on key messenger RNA (mRNA) expression (MT, MnSOD, CuZnSOD, CAT, ABCB1, HSP70, and CO1) by qPCR in the cockle Cerastoderma glaucum after chronic exposure to two high but environmentally relevant concentrations of CdCl (50 μg/L and 5 mg/L) for 12 h to 18 days. Cd accumulation measured in cockles' tissues is significantly higher in both treatment conditions compared to controls and in a dose-dependent manner. Stress on stress tests performed at different times of the experiment clearly demonstrated that exposure to both concentrations of Cd significantly affects cockle survival time in air. Important changes in gene transcription were also highlighted. In particular, MT, HSP70, CAT, and CuZnSOD seem to be relevant biomarkers of Cd exposure because (1) their mRNA levels increase upon exposure and (2) they are highly correlated to Cd accumulation in tissues. Results may be useful for control strategies and for the use of cockles as sentinel organisms. [ABSTRACT FROM AUTHOR]

Published
2015
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16. Storage and reproductive strategy of the carpet-shell clam, Ruditapes decussatusin the Gulf of Gabès (Tunisia)

Author

Smaoui-Damak, Wafa, Guebsi, Feten, Karray, Sahar, Rebai, Tarak, Costil, Katherine, and Hamza-Chaffai, Amel

Abstract

In this study, the variations of glycogen concentrations in Ruditapes decussatusfrom Sfax coasts (Tunisia) were described in relation to the reproductive cycle. Separate analyses were made of gonad, adductor muscle and ‘remainder’. The timing of gametogenic development and spawning was evaluated using qualitative histology associated with image analysis including (1) the estimation of the gonadal occupation index (GOI), (2) surface area occupied by reserve tissues and (3) variation in oocyte diameter. The reproductive cycle of R. decussatusexhibited partial asynchronization between sexes, the major difference being observed in the duration of the spawning period. Contrary to previous studies, we observed continuous partial spawning (e.g. 50% of ripe oocytes still subsisted at the partial spawning stage). During the gametogenic cycle, GOI varied significantly in males and in females. Most oocytes were ripe and ready to spawn when their diameter reached or exceeded 45 µm. The expansion of gonad was inversely proportional to the development of the foot tissue. Glycogen concentration showed significant temporal variations between tissues, indicating the clear differentiation in energy storage between the clam organs.

Published
2012
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