Gametogenesis and spawning of Spirobranchus tetraceros (Polychaeta, Serpulidae) in Abu Kir Bay, Egypt

Selim, Samia; Naby, F. Abdel; Gab-Alla, Ali; Ghobashy, Abdel Fattah A.

doi:10.12681/mms.195

Cited by 16 publications

(13 citation statements)

References 15 publications

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“…We found five specimens of S. gardineri in this study, all of them associated with live Cyphastrea. The low abundance of S. tetraceros in this study is slightly surprising, having been reported to be a very abundant Lessepsian migrant in the Suez Canal and Mediterranean (Selim et al, 2005). However, records from the Red Sea never mention such a massive occurrence (e.g.…”

Section: Discussioncontrasting

confidence: 71%

Substrate selection of Christmas tree worms (Spirobranchusspp.) in the Gulf of Eilat, Red Sea

et al. 2017

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Christmas tree worms (Spirobranchusspp.) are prominent sessile organisms inhabiting hermatypic corals in tropical and sub-tropical reefs. Until recently, most of the largerSpirobranchusspecies were considered to be in obligatory associations with live hermatypic corals. However, recent studies indicate that someSpirobranchusspecies can build tubes on artificial substrate as well and that others may show preferences for using specific species of corals and hydrozoans as substrates. In the present study, we conducted a survey ofSpirobranchusspp. substrate preference in the Gulf of Eilat. We found seven morphotaxa ofSpirobranchus, of which two may be a single new species. We show thatSpirobranchustaxa differ not only in their morphology, but also in their substrate use. Our results demonstrate that the ecological niche ofSpirobranchusis species-specific, and a putative innate preference exists for some substrates.

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Section: Discussioncontrasting

confidence: 71%

Substrate selection of Christmas tree worms (Spirobranchusspp.) in the Gulf of Eilat, Red Sea

et al. 2017

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“…gemineoa exhibited a cap-like appearance, which is similar to the acrosomal morphology observed in several other closely related polychaete species with ect-aquasperm (e.g. Hydroides dianthus , Serpula vermicularis , Vermiliopsis infundibulum [ 36 ] and Spirobranchus tetraceros [ 35 ]).…”

Section: Discussionsupporting

confidence: 73%

“…gemineoa and in some other polychaetes, such as Phragmatopoma lapidosa [ 21 ] and S . tetraceros [ 35 ]. The electron-dense fibrillary material, known as subacrosomal filaments, are presumed to be actin, which plays an important role in the acrosome reaction during fertilisation [ 21 ].…”

Section: Discussionmentioning

confidence: 99%

Ultrastructural investigation and in vitro recapitulation of spermatid differentiation in a potential bio-indicator species – The marine invertebrate Galeolaria gemineoa (Polychaeta: Serpulidae)

Aitken

Lin

2017

PLoS ONE

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Galeolaria gemineoa is a sessile broadcast-spawning marine invertebrate, whose spermatozoa have been regarded as a sensitive indicator for water quality monitoring. In this study, 10 steps of spermiogenesis have been identified at the ultrastructural level and this differentiation process has been recapitulated in vitro up to the point of spermiogenesis (step 7–9 spermatids). On completion of the second meiosis, newly formed spermatids were detached from the seminiferous epithelium and released to the lumen of each germinal chamber. These spermatids were present in pairs and interconnected by a cytoplasmic bridge throughout the entire spermiogenic process. On the basis of morphological events such as formation of the acrosome, elongation of the flagellum, and condensation of the nucleus, spermiogenesis has been temporally divided into Golgi phase, acrosomal phase and maturation phase. During the Golgi phase, proacrosomal vesicles appeared at the posterior pole of the spermatids and gradually fused into a proacrosomal vacuole. Simultaneously, the distal centriole docked onto the plasma membrane and gave rise to a formative flagellum. The acrosomal phase was characterised by differentiation of the acrosome, condensation of the chromatin and formation of a mitochondrial sheath surrounding the initial portion of the flagellum. During the maturation phase, the fully differentiated acrosome migrated to the anterior pole and excess cytoplasm was extruded from the spermatids in the form of residual bodies. In addition, we successfully induced step 1–3 spermatids to differentiate into the step 7–9 spermatids in both male germinal fluid and 10% foetal bovine serum in RPMI 1640 medium, but failed to replicate this process in female or boiled male germinal fluids. This finding supports our concept that spermatid differentiation in this species is dependent on intrinsic developmental programming and does not require input from accompanying nurse cells.

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“…Its first Mediterranean record was from Lebanon in 1965 ( Laubier, 1966 ) as Spirobranchus giganteus coutierei Gravier, 1908 (which is now understood as a sub-species of Spirobranchus tetraceros ; E. Kupriyanova, 2017, personal communication), followed by Rhodes, Greece ( Dumont & Werger, 1989 ), Abu Kir Bay, the Egyptian Mediterranean ( Selim et al, 2005 ), and the Turkish Levantine Sea ( Çinar et al, 2006 ).…”

Section: New Nis Records: Notes On Individual Speciesmentioning

confidence: 99%

A massive update of non-indigenous species records in Mediterranean marinas

Ulman

Ferrario

Occhpinti-Ambrogi

et al. 2017

PeerJ

124

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The Mediterranean Sea is home to over 2/3 of the world’s charter boat traffic and hosts an estimated 1.5 million recreational boats. Studies elsewhere have demonstrated marinas as important hubs for the stepping-stone transfer of non-indigenous species (NIS), but these unique anthropogenic, and typically artificial habitats have largely gone overlooked in the Mediterranean as sources of NIS hot-spots. From April 2015 to November 2016, 34 marinas were sampled across the following Mediterranean countries: Spain, France, Italy, Malta, Greece, Turkey and Cyprus to investigate the NIS presence and richness in the specialized hard substrate material of these marina habitats. All macroinvertebrate taxa were collected and identified. Additionally, fouling samples were collected from approximately 600 boat-hulls from 25 of these marinas to determine if boats host diverse NIS not present in the marina. Here, we present data revealing that Mediterranean marinas indeed act as major hubs for the transfer of marine NIS, and we also provide evidence that recreational boats act as effective vectors of spread. From this wide-ranging geographical study, we report here numerous new NIS records at the basin, subregional, country and locality level. At the basin level, we report three NIS new to the Mediterranean Sea (Achelia sawayai sensu lato, Aorides longimerus, Cymodoce aff. fuscina), and the re-appearance of two NIS previously known but currently considered extinct in the Mediterranean (Bemlos leptocheirus, Saccostrea glomerata). We also compellingly update the distributions of many NIS in the Mediterranean Sea showing some recent spreading; we provide details for 11 new subregional records for NIS (Watersipora arcuata, Hydroides brachyacantha sensu lato and Saccostrea glomerata now present in the Western Mediterranean; Symplegma brakenhielmi, Stenothoe georgiana, Spirobranchus tertaceros sensu lato, Dendostrea folium sensu lato and Parasmittina egyptiaca now present in the Central Mediterranean, and W. arcuata, Bemlos leptocheirus and Dyspanopeus sayi in the Eastern Mediterranean). We also report 51 new NIS country records from recreational marinas: 12 for Malta, 10 for Cyprus, nine for Greece, six for Spain and France, five for Turkey and three for Italy, representing 32 species. Finally, we report 20 new NIS records (representing 17 species) found on recreational boat-hulls (mobile habitats), not yet found in the same marina, or in most cases, even the country. For each new NIS record, their native origin and global and Mediterranean distributions are provided, along with details of the new record. Additionally, taxonomic characters used for identification and photos of the specimens are also provided. These new NIS records should now be added to the relevant NIS databases compiled by several entities. Records of uncertain identity are also discussed, to assess the probability of valid non-indigenous status.

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Gametogenesis and spawning of Spirobranchus tetraceros (Polychaeta, Serpulidae) in Abu Kir Bay, Egypt

Abstract: The serpulid polychaete Spirobranchus tetraceros of Red Sea / Indo-pacific origin, recently has succeeded to establish a foothold in Alexandria Mediterranean waters. Worms were monthly scraped from submerged iron substrates at Abu Kir Bay during the period

Cited by 16 publications

References 15 publications

Substrate selection of Christmas tree worms (Spirobranchusspp.) in the Gulf of Eilat, Red Sea

Substrate selection of Christmas tree worms (Spirobranchusspp.) in the Gulf of Eilat, Red Sea

Ultrastructural investigation and in vitro recapitulation of spermatid differentiation in a potential bio-indicator species – The marine invertebrate Galeolaria gemineoa (Polychaeta: Serpulidae)

A massive update of non-indigenous species records in Mediterranean marinas

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