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Frankfurt am Main, Germany

Gill A.C.,University of Sydney | Gill A.C.,College Street | Zajonz U.,Senckenberg Institute | Zajonz U.,Tropical Marine Ecosystems Group
Zootaxa | Year: 2011

Species of pseudoplesiopine and pseudochromine fishes from the Socotra Archipelago are reported based mainly on collections made in 1999 and 2000. Two species of the pseudoplesiopine genus Chlidichthys Smith are recorded: C. bibulous (Smith) and C. cacatuoides Gill and Edwards. Seven species of the pseudochromine genus Pseudochromis Rüppell are recorded: P. chrysospilus sp. nov., P. leucorhynchus Lubbock, P. linda Randall and Stanaland, P. nigrovittatus Boulenger, P. sankeyi Lubbock, P. socotraensis sp. nov. and an undetermined species (allied to P. punctatus Kotthaus). Pseudochromis chrysospilus belongs to a newly diagnosed P. caudalis-complex; it differs from other members of the complex in various meristic and coloration details. Pseudochromis socotraensis belongs to a newly diagnosed P. dutoiti-complex; it differs from other members of the complex in adult size, various meristic characters and live coloration. Based on both the collection records and additional visual records made in 1999 and 2000 the archipelagic distribution ranges of each species and the biotopes inhabited by them are described. Two additional species are tentatively reported from the Socotra Archipelago on the basis of sight records: P. dixurus Lubbock and P. omanensis Gill and Mee. © 2011 Magnolia Press. Source


Lavergne E.,Senckenberg Forschungsinstitut und Naturmuseum | Lavergne E.,Tropical Marine Ecosystems Group | Lavergne E.,University of Western Brittany | Lavergne E.,Kyoto University | And 6 more authors.
Journal of Fish Biology | Year: 2016

Estuarine and lagoonal surveys of Socotra Island and selected sites on the Hadhramout coast of Yemen were conducted with the objective of documenting and analysing fish diversity and assemblage structure. A total of 74 species in 35 families were recorded, among which 65 species in 32 families were from Socotra and 20 species in 17 families were from mainland Yemen. Twenty-one species represent new faunal records for Socotra. Including historic records re-examined in this study, the total fish species richness of estuaries and lagoons of Socotra Island reaches 76, which is relatively high compared to species inventories of well-researched coastal estuaries in southern Africa. Five species dominate the occurrence and abundance frequencies: Terapon jarbua, Hyporhamphus sindensis, Aphanius dispar, Ambassis gymnocephala and Chelon macrolepis. Rarefaction and extrapolation analyses suggest that the actual number of fish species inhabiting some of those estuaries might be higher than the one observed. Thus, additional sampling at specific sites should be conducted to record other less conspicuous species. Ordination and multivariate analyses identified four main distinct assemblage clusters. Two groups are geographically well structured and represent northern Socotra and mainland Yemen, respectively. The other two assemblage groups tend to be determined to a greater extent by the synchrony between physical (e.g. estuary opening periods) and biological (e.g. spawning and recruitment periods) variables than by geographical location. Finally, the single intertidal lagoon of Socotra represents by itself a specific fish assemblage. The high proportion of economically important fish species (38) recorded underscores the paramount importance of these coastal water bodies as nursery sites, and for sustaining vital provisioning ecosystem services. © 2016 The Fisheries Society of the British Isles. Source


Zajonz U.,Senckenberg Forschungsinstitut und Naturmuseum | Zajonz U.,Tropical Marine Ecosystems Group | Lavergne E.,Senckenberg Forschungsinstitut und Naturmuseum | Lavergne E.,University of Western Brittany | And 6 more authors.
Marine Pollution Bulletin | Year: 2016

The Socotra Archipelago is situated in the Gulf of Aden where tropical and "pseudo-temperate" conditions combine to create a unique marine ecosystem. The diversity, ecology, productivity and fisheries of the coastal fish assemblages are still relatively understudied and no update of the scientific knowledge existed. The islands support unique coastal and coral-associated fish assemblages in spite of the limited biogenic reef frameworks. Fish diversity is the highest among comparable Arabian eco-regions, and fish biomass productivity high too by Indian Ocean standards. The production of the once traditionally-managed small-scale fishery is severely declining and whether it is sustainable nowadays is extremely doubtful. At a time when Yemen is torn apart by a severe political and humanitarian crisis it is timely to review and update the current state of knowledge for scientists and managers, and thereby ease access to existing information, facilitating follow-on studies and evidence-based conservation and fisheries management. © 2015 Elsevier Ltd. Source

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