DOCSLIB.ORG

Foot Abnormalities in Venericardia Antiquata and Venus Verrucosa from the Bizerte Lagoon Complex

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Foot Abnormalities in Venericardia Antiquata and Venus Verrucosa from the Bizerte Lagoon Complex e Rese tur arc ul h c & a u D q e A v e f l o o Béjaoui et al., J Aquac Res Development 2016, 7:7 l p a m n Journal of Aquaculture r e u n DOI: 10.4172/2155-9546.1000434 o t J ISSN: 2155-9546 Research & Development Research Article OpenOpen Access Access Foot Abnormalities in Venericardia antiquata and Venus verrucosa from the Bizerte Lagoon Complex (Northern Tunisia): Hydrodynamics and Sediment Texture Inductions Jihen Maâtoug Béjaoui, Ferdaous Jaafar Kefi, Anwar Mleiki and Najoua Trigui El Menif* Faculty of Sciences of Bizerte (FSB), Laboratory of Environment Biomonitoring, University of Carthage, Bizerte, Tunisia Abstract The Examination of the soft part of the two bivalve species Venericardia antiquata (Linnaeus 1758) and Venus verrucosa (Linnaeus 1758), that occur together in northern coast of Tunisia, allowed us to discover for the first time the presence of morphological abnormalities affecting the foot of many individuals (annual rate of 31.6%). The presence of a developed byssus was also detected in some specimens of V. antiquata. A classification scale of this malformation, established depending on the degree of this anomaly, showed six initial types that evolve to form two or three feet, at the posterior and/or anterior sides of the animal. In order to determine the causes of this malformation, experiments of transplantation were carried out. Specimens of V. verrucosa collected from Zarzouna station were transplanted in Chaâra station which is characterized by low rate of malformations, low hydrodynamics and different sediment type and vice versa. Results revealed that foot malformations degree is highly correlated with both hydrodynamics and substrate type. This may be the main cause of foot malformations. The present study provides data on foot malformations in V. antiquata and V. verrucosa from the Tunisian coast that could be used as a starting point for future monitoring programs. Keywords: Venericardia antiquata; Venus verrucosa; Foot been reported by several authors. The causes of such alterations could malformation; Transplantation; Zarzouna; Chaara be infestation by parasites as in Mesodesma donacium affected by the polychaete Polydora bioccipitalis secreting conchyoline and calcite Introduction around this spionid for isolation [14]. Many bivalve species play important role in marine ecosystem by In Tunisia, studies on mollusk disturbances are scarce. In fact, filtering the water and serving as habitat and prey for a variety of sea life. in Bivalves, the examination of the soft part of the European clam In addition, they contribute to the modifications of the substrata [1]. Ruditapes decussatus and the shell of the date mussel Lithophaga During the past few decades, many bivalve species have been studied lithophaga collected from the north lake of Tunis and the bay of Bizerte, to determine their potential as bio-monitoring organisms and they respectively, revealed a deformation in the European clam which become a popular choice for pollutants, parasites and natural factors consists on the differentiation of two siphons inhaling and exhaling (abiotics factors, hydrodynamics…) monitoring for several reasons. originating from both usual siphons, in the form of Y so possesses four They are sedentary, regionally abundant, long lived, have adequate functional openings instead of two [15]. In the date mussel, Trigui El tissue mass for analysis, filter feeder (accumulate pollutants from food, Menif et al. [15] showed the presence of shell disturbances in external water and also from the ingestion of inorganic particulate materials), and internal sides of the valve. In Gastropods, Trigui El Menif et al. hence fulfilling the criteria as good bio-indicators [2]. Consequently, [16] and Lahbib et al. [17] described differentiation of a male genital such organisms have been largely used in programs of biological tract (imposex phenomenon) in females of the gastropods Hexaplex monitoring as mussels and oysters which are widely used as biological trunculus and Bolinus brandaris [18] collected along the Tunisian indicators in national and international monitoring programs [3]. coast. Furthermore, Lahbib et al. [17] and Abidli et al. [18] reported the presence of malformations and excrescences affecting the penis and the Structural abnormalities caused by predators and parasites as the vas deferens in both sexes of H. trunculus and B. brandaris from some formation of mud blisters on the nacre of oysters by the annelid Polydora stations of Tunisian coast. [4]. Supernumerary siphons, either functional or nonfunctional, occur on the hard clam, Mercenaria and the soft-shell clam, Mya arenaria A comparative bio-ecological study of the two bivalve species [5]. The causes of these deformities remain undetermined. Similarly Venus verrucosa and Venericardia antiquata, collected from a site bifurcation of the foot of clams has been reported by Atkins [6] and the adductor muscle of oysters by Pauley and Sayce [7]. The presence of parasites, Curtuteria australis and Himasthla sp. in the foot of the *Corresponding author: Najoua Trigui El Menif, Faculty of Sciences of Bizerte cockle Cerastoderma edule, reduces the burrowing capacity of this (FSB), Laboratory of Environment Biomonitoring, University of Carthage, 7021 endogenous bivalve due to foot atrophy [8,9]. In some other cases, Zarzouna, Bizerte, Tunisia, Tel: 00216 98 94 58 24; Fax: 00216 71 88 84 67; E-mail: [email protected] the causes of tumors and abscesses in the mantle of Crassostrea gigas [10,11] and malformations of the labial palps and differentiation of Received June 16, 2016; Accepted July 22, 2016; Published July 25, 2016 a supernumerary foot in Mytilus edulis [6] are still unknown. It has Citation: Béjaoui JM, Kefi FJ, Mleiki A, El Menif NT (2016) Foot Abnormalities in been shown that algal blooms have a direct effect on bivalves, causing Venericardia antiquata and Venus verrucosa from the Bizerte Lagoon Complex (Northern Tunisia): Hydrodynamics and Sediment Texture Inductions. J Aquac Res inhibition of valve activity and production of lesions in the mantle, Development 7: 434. doi:10.4172/2155-9546.1000434 gills and digestive gland [12]. Marteiliosis and Bonamiosis, caused by the protozoan Marteilia refringens and the bacteria Bonamia ostrea Copyright: © 2016 Béjaoui JM, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits respectively, induce the digestive gland destruction and gills ulceration unrestricted use, distribution, and reproduction in any medium, provided the in Ostrea edulis [13]. Moreover, behavior changes of mollusks have original author and source are credited. J Aquac Res Development ISSN: 2155-9546, an open access journal Volume 7 • Issue 7 • 1000434 Citation: Béjaoui JM, Kefi FJ, Mleiki A, El Menif NT (2016) Foot Abnormalities in Venericardia antiquata and Venus verrucosa from the Bizerte Lagoon Complex (Northern Tunisia): Hydrodynamics and Sediment Texture Inductions. J Aquac Res Development 7: 434. doi:10.4172/2155- 9546.1000434 Page 2 of 7 subjected to intense anthropogenic pressure and high hydrodynamics, Stage 0: Normal foot (Figures 3A and 4B). was conducted. The examination of the soft part showed a very Stage 1: This stage is expressed by five types. It starts by ventral pronounced malformation of the foot in both species. The present and central groove in the antero-posterior part of the foot (Stage 1a, study was designed to describe this malformation, to establish a gradual Figures 3B and 4B). This groove can present or not a byssus (Figure developmental scale and to determine the possible causes. 3B’). In the second type, the groove is present in the sagittal plane Materials and Methods (Stage 1b, Figures 3C and 4C). The stage 1c (Figure 4D) appeared with a transverse groove with circular section perpendicular to the antero- A total of 1393 specimens of the clam Venus verrucosa and 1354 posterior foot. The stage 1d (Figure 4E) showed a bifurcation of the of the cockle Venericardia antiquata with a shell length ranging from posterior tip of the foot. The stage 1e (Figures 3E and 4F) revealed a 10 to 60 mm for the clam and 5 to 40 mm for the cockle were collected bifurcation occurring in the anterior tip of the foot. monthly from July 2008 to August 2009 by SCUBA at Zarzouna station (Figure 1). This sampling site is located in the first part of the artificial Stage 2: This stage is expressed by seven types and characterized channel of Bizerte which is characterized by important biodiversity by the groove evolution in the anterior direction. In this case, the [19], high anthropic activity [20] and strong hydrodynamics [21]. anterior foot tip grows and becomes hypertrophied (Stage 2a1, Figures This channel (200 m width, 1500 m length and about 12 m depth) is 3F and 4G). Furthermore, the groove can deep and grows in the antero- directly connected to the Mediterranean Sea. The sediment of this site posterior direction (Stage 2a2, Figure 3G). A central groove appears is characterized by fine fraction: 0.063 mm<sediment texture ≤ 0.25 to grow in depth from the anterior side and accompanied with an mm (83.32%) and gross fraction: 0.5 mm<sediment texture ≤ 2 mm early anterior bifurcation oriented from the left or right side of the (16.68%) [22]. foot (Stage 2a3, Figure 3H). Otherwise from Stage 1a and 1b, the In the laboratory, animals were divided into 10 class sizes for the antero-posterior central groove was present simultaneously with an clam [(10-15), (15-20), (20-25), (25-30), (30-35), (35-40), (40-45), (45- anterior sagittal groove (Stage 2ab, Figure 3I). Besides, the groove 50), (50-550 and (55-60)] and 7 class sizes for the cockle [(5-10), (10- developed in depth and width giving two ventrally separated feet 15), (15-20), (20-25), (25-30), (30-35) and (35-40)]. and dorsally joined. Depending on the location of the groove, both tips of foot, anterior or posterior, are unequal.
Load more

Recommended publications
  • The Lioconcha Castrensis Species Group (Bivalvia : Veneridae), with the Description of Two New Species
    Molluscan Research 30(3): 117–124 ISSN 1323-5818 http://www.mapress.com/mr/ Magnolia Press The Lioconcha castrensis species group (Bivalvia : Veneridae), with the description of two new species SANCIA E.T. VAN DER MEIJ1, ROBERT G. MOOLENBEEK2 & HENK DEKKER2 1 Netherlands Centre for Biodiversity Naturalis (department of Marine Zoology), P.O. Box 9517, 2300 RA Leiden, The Nether- lands. Email: [email protected] (corresponding author) 2 Netherlands Centre for Biodiversity Naturalis (section Zoological Museum of Amsterdam), Mauritskade 57, 1092 AD Amsterdam, The Netherlands. Email: [email protected] Abstract Part of the genus Lioconcha Mörch, 1853 is reviewed. Species strongly resembling Lioconcha castrensis (Linnaeus, 1758) are discussed and two new species are described: Lioconcha arabaya n. sp. from the Northwest Indian Ocean and Lioconcha rumphii n. sp. from Thailand and Sumatra. These three species, together with Lioconcha macaulayi Lamprell & Healy, 2002, share many morphological similarities and we suspect them to be closely related. They are referred to as the Lioconcha cast- rensis species group. Furthermore, lectotypes of Venus castrensis Linnaeus, 1758, and Venus fulminea Röding, 1798, are desig- nated. The latter is considered a junior synonym of V. castrensis. Key words: Indo-Pacific, Mollusca, Persian Gulf, Red Sea, taxonomy Introduction between the anterior and posterior extremities, height is measured vertically from the umbo to the ventral margin and The delimitation within the tropical venerid genus Lioconcha total width (or inflation) is the greatest distance between the Mörch, 1853, is problematic, due to high levels of external surfaces of the paired valves. For an extensive list of intraspecific morphological variability and relatively few synonyms of figured specimens of Lioconcha castrensis we useful morphological characters (Lamprell and Healy 2002).
    [Show full text]
  • National Monitoring Program for Biodiversity and Non-Indigenous Species in Egypt
    UNITED NATIONS ENVIRONMENT PROGRAM MEDITERRANEAN ACTION PLAN REGIONAL ACTIVITY CENTRE FOR SPECIALLY PROTECTED AREAS National monitoring program for biodiversity and non-indigenous species in Egypt PROF. MOUSTAFA M. FOUDA April 2017 1 Study required and financed by: Regional Activity Centre for Specially Protected Areas Boulevard du Leader Yasser Arafat BP 337 1080 Tunis Cedex – Tunisie Responsible of the study: Mehdi Aissi, EcApMEDII Programme officer In charge of the study: Prof. Moustafa M. Fouda Mr. Mohamed Said Abdelwarith Mr. Mahmoud Fawzy Kamel Ministry of Environment, Egyptian Environmental Affairs Agency (EEAA) With the participation of: Name, qualification and original institution of all the participants in the study (field mission or participation of national institutions) 2 TABLE OF CONTENTS page Acknowledgements 4 Preamble 5 Chapter 1: Introduction 9 Chapter 2: Institutional and regulatory aspects 40 Chapter 3: Scientific Aspects 49 Chapter 4: Development of monitoring program 59 Chapter 5: Existing Monitoring Program in Egypt 91 1. Monitoring program for habitat mapping 103 2. Marine MAMMALS monitoring program 109 3. Marine Turtles Monitoring Program 115 4. Monitoring Program for Seabirds 118 5. Non-Indigenous Species Monitoring Program 123 Chapter 6: Implementation / Operational Plan 131 Selected References 133 Annexes 143 3 AKNOWLEGEMENTS We would like to thank RAC/ SPA and EU for providing financial and technical assistances to prepare this monitoring programme. The preparation of this programme was the result of several contacts and interviews with many stakeholders from Government, research institutions, NGOs and fishermen. The author would like to express thanks to all for their support. In addition; we would like to acknowledge all participants who attended the workshop and represented the following institutions: 1.
    [Show full text]
  • DEEP SEA LEBANON RESULTS of the 2016 EXPEDITION EXPLORING SUBMARINE CANYONS Towards Deep-Sea Conservation in Lebanon Project
    DEEP SEA LEBANON RESULTS OF THE 2016 EXPEDITION EXPLORING SUBMARINE CANYONS Towards Deep-Sea Conservation in Lebanon Project March 2018 DEEP SEA LEBANON RESULTS OF THE 2016 EXPEDITION EXPLORING SUBMARINE CANYONS Towards Deep-Sea Conservation in Lebanon Project Citation: Aguilar, R., García, S., Perry, A.L., Alvarez, H., Blanco, J., Bitar, G. 2018. 2016 Deep-sea Lebanon Expedition: Exploring Submarine Canyons. Oceana, Madrid. 94 p. DOI: 10.31230/osf.io/34cb9 Based on an official request from Lebanon’s Ministry of Environment back in 2013, Oceana has planned and carried out an expedition to survey Lebanese deep-sea canyons and escarpments. Cover: Cerianthus membranaceus © OCEANA All photos are © OCEANA Index 06 Introduction 11 Methods 16 Results 44 Areas 12 Rov surveys 16 Habitat types 44 Tarablus/Batroun 14 Infaunal surveys 16 Coralligenous habitat 44 Jounieh 14 Oceanographic and rhodolith/maërl 45 St. George beds measurements 46 Beirut 19 Sandy bottoms 15 Data analyses 46 Sayniq 15 Collaborations 20 Sandy-muddy bottoms 20 Rocky bottoms 22 Canyon heads 22 Bathyal muds 24 Species 27 Fishes 29 Crustaceans 30 Echinoderms 31 Cnidarians 36 Sponges 38 Molluscs 40 Bryozoans 40 Brachiopods 42 Tunicates 42 Annelids 42 Foraminifera 42 Algae | Deep sea Lebanon OCEANA 47 Human 50 Discussion and 68 Annex 1 85 Annex 2 impacts conclusions 68 Table A1. List of 85 Methodology for 47 Marine litter 51 Main expedition species identified assesing relative 49 Fisheries findings 84 Table A2. List conservation interest of 49 Other observations 52 Key community of threatened types and their species identified survey areas ecological importanc 84 Figure A1.
    [Show full text]
  • Mercenaria Mercenaria ©
    Mercenaria mercenaria © 16mar2001 Copyright 2001 by Richard Fox Lander University Ph. MOLLUSCA, Cl.Bivalvia, sCl.Heterodonta, O.Veneroida, F.Veneridae Introduction Mollusca The phylum Mollusca is the second largest in the animal kingdom and comprises several classes consisting of the Monoplacophora, Polyplacophora, Gastropoda, Bivalvia, Scaphopoda, Aplacophora, and Cephalopoda. The typical mollusc has a shell, muscular foot, head with mouth and sense organs, and a visceral mass containing most of the gut and the heart, gonads, and kidney. Part of the body is enclosed in a mantle formed of a fold of the body wall. The mantle encloses a space known as the mantle cavity which is filled with water or air and in which the respiratory organs, anus, nephridiopore(s) and gonopore(s) are located. The coelom is reduced to small spaces including the pericardial cavity and gonocoel. The well-developed blood vascular system consists of the heart and vessels leading to a spacious hemocoel in which most of the viscera are located. The kidneys are large metanephridia. Molluscs may be either gonochoristic or hermaphroditic. Spiral cleavage produces a characteristic veliger larva in most groups unless it is suppressed in favor of direct development or another larva. Molluscs are well represented in marine, freshwater, and terrestrial habitats. Bivalvia Bivalvia is a large class of molluscs whose shell is divided into right and left portions. There is usually a crystalline style but never a radula. Bivalves are flattened from side to side and the head is reduced and bears no special sense organs. The large mantle cavity is located on the sides and contains the large gills.
    [Show full text]
  • Cop13 Prop. 35
    CoP13 Prop. 35 CONSIDERATION OF PROPOSALS FOR AMENDMENT OF APPENDICES I AND II A. Proposal Inclusion of Lithophaga lithophaga in Appendix II, in accordance with Article II, paragraph 2 (a). B. Proponents Italy and Slovenia (on behalf of the Member States of the European Community). C. Supporting statement Lithophaga lithophaga is an endolithic mussel from the family Mitilidae, which inhabits limestone rocks. This species needs specific substrate for its growth and owing to its particular biology (slow growing) it is not suitable for commercial breeding. L. lithophaga has a very distinctive and well known date-like appearance. L. lithophaga is distributed throughout the Mediterranean Sea. In the Atlantic Ocean it can be found on the Portugal coast and on the North African coast down to Senegal. It also inhabits the northern coast of Angola. The sole purpose of L. lithophaga exploitation is human consumption. It is known that the harvesting of the species from the wild for international trade has detrimental impact on the species. The collection of L. lithophaga for the purpose of trade poses a direct threat to this species due to the loss of its habitat. When L. lithophaga is harvested, the rocks it inhabits are broken into small pieces, often by very destructive methods such as pneumatic hammers and explosives. Broken rocks thus become unsuitable for colonisation by marine organisms. In addition to the direct threat to L. lithophaga, its collection reduces topographic heterogenity, macroalgal cover and epibiota. The destruction caused by L. lithophaga exploitation seriously affects littoral fish populations. The over-exploitation of L. lithophaga has caused important local ecological damage in many Mediterranean areas.
    [Show full text]
  • Annotated Bibliography of Fishing Impacts on Habitat - September 2003 Update
    ANNOTATED BIBLIOGRAPHY OF FISHING IMPACTS ON HABITAT - SEPTEMBER 2003 UPDATE Gulf States Marine Fisheries Commission SEPTEMBER 2003 GSMFC No.: 115 Annotated Bibliography of Fishing Impacts on Habitat - September 2003 Update Edited by Jeffrey K. Rester Gulf States Marine Fisheries Commission Gulf States Marine Fisheries Commission September 2003 Introduction This is the third in a series of updates to the Gulf States Marine Fisheries Commission’s Annotated Bibliography of Fishing Impacts on Habitat originally produced in February 2000. The Commission’s Habitat Subcommittee felt that the gathering of pertinent literature should continue. The third update contains 52 new articles since the publication of the last update. The update uses the same criteria that the original bibliography and first and second updates used to compile articles. It attempts to compile a listing of papers and reports that address the many effects and impacts that fishing can have on habitat and the marine environment. The bibliography is not limited to scientific literature only. It includes technical reports, state and federal agency reports, college theses, conference and meeting proceedings, popular articles, and other forms of nonscientific literature. This was done in an attempt to gather as much information on fishing impacts as possible. Researchers will be able to decide for themselves whether they feel the included information is valuable. Fishing, both recreational and commercial, can have many varying impacts on habitat and the marine environment. Whether a fisher prop scars seagrass, drops an anchor on a coral reef, or drags a trawl across the bottom, each act can alter habitat and affect fish populations.
    [Show full text]
  • Spatial Variability in Recruitment of an Infaunal Bivalve
    Spatial Variability in Recruitment of an Infaunal Bivalve: Experimental Effects of Predator Exclusion on the Softshell Clam (Mya arenaria L.) along Three Tidal Estuaries in Southern Maine, USA Author(s): Brian F. Beal, Chad R. Coffin, Sara F. Randall, Clint A. Goodenow Jr., Kyle E. Pepperman, Bennett W. Ellis, Cody B. Jourdet and George C. Protopopescu Source: Journal of Shellfish Research, 37(1):1-27. Published By: National Shellfisheries Association https://doi.org/10.2983/035.037.0101 URL: http://www.bioone.org/doi/full/10.2983/035.037.0101 BioOne (www.bioone.org) is a nonprofit, online aggregation of core research in the biological, ecological, and environmental sciences. BioOne provides a sustainable online platform for over 170 journals and books published by nonprofit societies, associations, museums, institutions, and presses. Your use of this PDF, the BioOne Web site, and all posted and associated content indicates your acceptance of BioOne’s Terms of Use, available at www.bioone.org/page/terms_of_use. Usage of BioOne content is strictly limited to personal, educational, and non-commercial use. Commercial inquiries or rights and permissions requests should be directed to the individual publisher as copyright holder. BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting authors, nonprofit publishers, academic institutions, research libraries, and research funders in the common goal of maximizing access to critical research. Journal of Shellfish Research, Vol. 37, No. 1, 1–27, 2018. SPATIAL VARIABILITY IN RECRUITMENT OF AN INFAUNAL BIVALVE: EXPERIMENTAL EFFECTS OF PREDATOR EXCLUSION ON THE SOFTSHELL CLAM (MYA ARENARIA L.) ALONG THREE TIDAL ESTUARIES IN SOUTHERN MAINE, USA 1,2 3 2 3 BRIAN F.
    [Show full text]
  • National Monitoring Program for Biodiversity and Non-Indigenous Species in Egypt
    National monitoring program for biodiversity and non-indigenous species in Egypt January 2016 1 TABLE OF CONTENTS page Acknowledgements 3 Preamble 4 Chapter 1: Introduction 8 Overview of Egypt Biodiversity 37 Chapter 2: Institutional and regulatory aspects 39 National Legislations 39 Regional and International conventions and agreements 46 Chapter 3: Scientific Aspects 48 Summary of Egyptian Marine Biodiversity Knowledge 48 The Current Situation in Egypt 56 Present state of Biodiversity knowledge 57 Chapter 4: Development of monitoring program 58 Introduction 58 Conclusions 103 Suggested Monitoring Program Suggested monitoring program for habitat mapping 104 Suggested marine MAMMALS monitoring program 109 Suggested Marine Turtles Monitoring Program 115 Suggested Monitoring Program for Seabirds 117 Suggested Non-Indigenous Species Monitoring Program 121 Chapter 5: Implementation / Operational Plan 128 Selected References 130 Annexes 141 2 AKNOWLEGEMENTS 3 Preamble The Ecosystem Approach (EcAp) is a strategy for the integrated management of land, water and living resources that promotes conservation and sustainable use in an equitable way, as stated by the Convention of Biological Diversity. This process aims to achieve the Good Environmental Status (GES) through the elaborated 11 Ecological Objectives and their respective common indicators. Since 2008, Contracting Parties to the Barcelona Convention have adopted the EcAp and agreed on a roadmap for its implementation. First phases of the EcAp process led to the accomplishment of 5 steps of the scheduled 7-steps process such as: 1) Definition of an Ecological Vision for the Mediterranean; 2) Setting common Mediterranean strategic goals; 3) Identification of an important ecosystem properties and assessment of ecological status and pressures; 4) Development of a set of ecological objectives corresponding to the Vision and strategic goals; and 5) Derivation of operational objectives with indicators and target levels.
    [Show full text]
  • SPIXIANA ©Zoologische Staatssammlung München
    ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Spixiana, Zeitschrift für Zoologie Jahr/Year: 1986 Band/Volume: 009 Autor(en)/Author(s): Barash Al., Danin Z. Artikel/Article: Further additions to the knowledge of Indo-Pacific Mollusca in the Mediterranean Sea (Lessepsian migrants) 117-141 ©Zoologische Staatssammlung München;download: http://www.biodiversitylibrary.org/; www.biologiezentrum.at SPIXIANA ©Zoologische Staatssammlung München;download: http://www.biodiversitylibrary.org/; www.biologiezentrum.at Today we are able to present an additional report on 29 Indo-Pacific species in the Mediterranean which have not been discussed in the general reports of 1948-1977 mentioned above. Eight species are recorded for the first time; 3 species were mentioned by name only (but not discussed) in the article by Barash & Danin (1982: 107) and 18 species have been dealt with in articles on individual Indo-Pacific immigrants. Along with the 29 species not yet discussed in earher reports, 4 species, which have been treated pre- viously are included in this paper for supplementary data (see general remarks, p. 130ff.). This report is based on material obtained from various sources, as follows: A great deal of dredging was carried out during 1974-1977 by the late Prof. Ch. Lewinsohn (Tel Aviv University) and his assistants M. Tom and B. Galil. They worked in the infralittoral zone in north and south Israel and opposite the Mediterranean coast of north Sinai. Among the material coUected by them the nudibranch Plocamopherus ocellatus is noteworthy because of its power of luminescence (O'Do- NOGHUE 1929: 808).
    [Show full text]
  • Os Nomes Galegos Dos Moluscos 2020 2ª Ed
    Os nomes galegos dos moluscos 2020 2ª ed. Citación recomendada / Recommended citation: A Chave (20202): Os nomes galegos dos moluscos. Xinzo de Limia (Ourense): A Chave. https://www.achave.ga /wp!content/up oads/achave_osnomesga egosdos"mo uscos"2020.pd# Fotografía: caramuxos riscados (Phorcus lineatus ). Autor: David Vilasís. $sta o%ra est& su'eita a unha licenza Creative Commons de uso a%erto( con reco)ecemento da autor*a e sen o%ra derivada nin usos comerciais. +esumo da licenza: https://creativecommons.org/ icences/%,!nc-nd/-.0/deed.g . Licenza comp eta: https://creativecommons.org/ icences/%,!nc-nd/-.0/ ega code. anguages. 1 Notas introdutorias O que cont!n este documento Neste recurso léxico fornécense denominacións para as especies de moluscos galegos (e) ou europeos, e tamén para algunhas das especies exóticas máis coñecidas (xeralmente no ámbito divulgativo, por causa do seu interese científico ou económico, ou por seren moi comúns noutras áreas xeográficas) ! primeira edición d" Os nomes galegos dos moluscos é do ano #$%& Na segunda edición (2$#$), adicionáronse algunhas especies, asignáronse con maior precisión algunhas das denominacións vernáculas galegas, corrixiuse algunha gralla, rema'uetouse o documento e incorporouse o logo da (have. )n total, achéganse nomes galegos para *$+ especies de moluscos A estrutura )n primeiro lugar preséntase unha clasificación taxonómica 'ue considera as clases, ordes, superfamilias e familias de moluscos !'uí apúntanse, de maneira xeral, os nomes dos moluscos 'ue hai en cada familia ! seguir
    [Show full text]
  • High Seas Mediterranean Marine Reserves: a Case Study for the Southern Balearics and the Sicilian Channel
    High Seas Mediterranean Marine Reserves: a case study for the Southern Balearics and the Sicilian Channel A briefing to the CBD’s Expert workshop on scientific and technical guidance on the use of biogeographic classification systems and identification of marine areas beyond national jurisdiction in need of protection Ottawa, 29 September–2 October 2009 Greenpeace International August 2009 Table of Contents Table of Contents...........................................................................................................2 Abbreviations and Acronyms ........................................................................................4 Executive Summary.......................................................................................................5 1. Introduction................................................................................................................8 2. Existing research on the areas and availability of information................................10 3. Southern Balearics ...................................................................................................11 3.1 Area description.................................................................................................11 3.1.1 Main topographic features..........................................................................11 3.1.2. Currents and nutrients circulation system.................................................12 3.2 Topographic Features of Remarkable Biological relevance..............................14 3.2.1. Seamounts
    [Show full text]
  • Juvenile Mortality in Benthic Marine Invertebrates
    MARINE ECOLOGY PROGRESS SERIES Vol. 146: 265-282, 1997 Published January 30 Mar Ecol Prog Ser REVIEW Juvenile mortality in benthic marine invertebrates Louis A. Gosselin*,Pei-Yuan Qian Department of Biology, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong ABSTRACT Th~rtyyears ago Thorson (1966 Neth J Sea Res 3 267-293) calculated that juvenile mor- tallty in manne bivalves could exceed 98 6% Subsequently juvenile mortality rates have been assumed to be high and to influence the evolution of life history traits However there have been no attempts to establish whether high luvenile mortality IS common or to determine if lnterspecific trends in luven~lemortality exist To address th~sIssue we revlewed 30 studies of age-specif~cmortality among bivalves, gastropods, barnacles ascid~ans,bryozoans and echinoderms High juvenile mortality is widespread among benthic marlne Invertebrates with 20 of the 30 stud~esreporting levels of luve- n~lemortal~ty >90% Mortal~tyis part~cularlyh~gh during the first moments of luvenile life and can exceed 30% during the f~rstday Pool~ngsurv~vorship data from all species revealed a general trend with survivorsh~pdecreasing exponentially during the first days or weeks of juvenile life until by the age of 4 mo, virtually all cohorts were reduced to <20% of their ~nitialnumbers ~nortalityremained low thereafter We suggest that extreme vulnerability at the onset of luvenile life is a shared tra~tthat is largely responsible for the surv~vorshiptrend Natural variation within this trend
    [Show full text]