DOCSLIB.ORG

Age and Growth in Three Populations of Dosinia Exoleta (Bivalvia: Veneridae) from the Portuguese Coast

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Age and Growth in Three Populations of Dosinia Exoleta (Bivalvia: Veneridae) from the Portuguese Coast Helgol Mar Res (2013) 67:639–652 DOI 10.1007/s10152-013-0350-7 ORIGINAL ARTICLE Age and growth in three populations of Dosinia exoleta (Bivalvia: Veneridae) from the Portuguese coast Paula Moura • Paulo Vasconcelos • Miguel B. Gaspar Received: 31 October 2012 / Revised: 25 February 2013 / Accepted: 4 March 2013 / Published online: 20 March 2013 Ó Springer-Verlag Berlin Heidelberg and AWI 2013 Abstract The present study aimed at estimating the age Keywords Dosinia exoleta Á Age Á Growth Á and growth in three populations of Dosinia exoleta from Latitudinal variation Á Fishing effects Á Portugal the Portuguese coast (Aveiro in the north, Setu´bal in the southwest and Faro in the south). Two techniques were compared to ascertain the most suitable method for ageing Introduction D. exoleta. Growth marks on the shell surface and acetate peel replicas of sectioned shells were the techniques The rayed artemis or mature dosinia (Dosinia exoleta applied. Two hypotheses were tested: growth parameters Linnaeus, 1758) is distributed from the Norwegian and present latitudinal variation along the Portuguese coast; Baltic Seas, southwards to the Iberian Peninsula, into the growth parameters are influenced by the fishing exploita- Mediterranean, and along the western coast of Africa to tion. Shell surface rings proved inappropriate for ageing Senegal and Gabon (Tebble 1966). This species burrows this species, whereas acetate peels provided realistic esti- deeply in sand, mud and gravel bottoms, from the intertidal mates of the von Bertalanffy growth parameters (K, L? and zone to 70 m depth (Poppe and Goto 1993; Macedo et al. t0). A latitudinal gradient in growth rate was detected, with 1999), but can be found up to 150 m depth (Anon 2001). In a clear southward increase in the growth coefficient (K)of Portugal, D. exoleta is among the target species of the D. exoleta (Faro [ Setu´bal and Aveiro) indicating that bivalve dredging fleet operating in the northern coast, warmer waters in southern Portugal provide optimal con- whereas along the southwestern and southern coasts, it ditions for the growth of this species. Fishing exploitation constitutes a by-catch species of the dredge fishery (Gaspar in northern Portugal targets larger individuals and leaves et al. 2007). Fishery exploitation in the northern coast behind a younger population of smaller individuals, started around 2007 and since then annual landings ranged decreasing the asymptotic shell length (L?)ofD. exoleta between a maximum of 37.0 tons in 2007 and a minimum from Aveiro. The overall growth performance was com- of 9.4 tons in 2010 (DGPA 2012). The latest statistics pared among populations of D. exoleta and with other available on the landings of D. exoleta in northern Portugal venerid species worldwide. (Matosinhos wholesale market) reported total landings of 15.3 tons in 2011, corresponding to an overall value for first sale of 15.3 thousand euro (DGPA 2012). Communicated by Franke. Knowledge on the age and growth of commercially exploited bivalve species is a crucial requirement for the & P. Moura Á P. Vasconcelos Á M. B. Gaspar ( ) successful management of the fishery (Gaspar et al. 2004). Instituto Portugueˆs do Mar e da Atmosfera, I.P./IPMA, Avenida 5 de Outubro s/n, 8700-305 Olha˜o, Portugal In bivalves, growth rings on the shell surface have been e-mail: [email protected] widely used to make inferences about age and growth rate (Deval 2001). Although being the most quick and economic P. Vasconcelos method, in some species it is difficult to discern real seasonal Departamento de Biologia, Centro de Estudos do Ambiente e do Mar (CESAM), Universidade de Aveiro, Campus de Santiago, growth rings from false rings caused by gonad development 3810-193 Aveiro, Portugal and spawning, diseases, extreme temperatures, storms and 123 640 Helgol Mar Res (2013) 67:639–652 damage during dredging (Gaspar et al. 1995, 2004; Rich- Materials and methods ardson 2001; Keller et al. 2002; Moura et al. 2009). These constraints have been overcome by analysing internal shell Samples of D. exoleta were collected between May and microgrowth banding patterns revealed in acetate peel rep- June 2010 in three areas along the Portuguese coast: Aveiro licas of sectioned shells (Jones et al. 1990; Ramo´n and (408590–418030N) in the northern coast, Setu´bal (388230– Richardson 1992; Richardson 2001). Although being a time- 388270N) in the southwestern coast and Faro (368580– consuming method, internal growth lines visible in acetate 368590N) in the southern coast (Fig. 1). Individuals were peel replicas generally provide a reliable record of the age caught by the IPMA’s RV ‘‘Diplodus’’ operating bivalve and growth history of individuals (Anwar et al. 1990). dredges on sandy bottoms between 8 and 12 m depth in the However, some problems in the identification of the annual southern coast, 8 and 15 m depth in the southwestern coast ring may also occur, especially in long-lived species. In and between 15 and 30 m depth in the northern. Following older specimens, the umbonal region is usually eroded, the usual fishing procedures, the dredges were towed for making impossible to identify the first growth rings (Gaspar 15 min at a constant speed of 2 knots. The dredges used et al. 2004). In addition, in older individuals growth were identical to those operated by the commercial fleet. In becomes slower and the later growth rings are deposited brief, the dredge weighs around 40 kg and consists of a very close together at the shell margin, making them hardly rigid iron structure with a toothed lower bar (15 cm tooth discernible (Deval and Oray 1998; Ezgeta-Balic´ et al. 2011). length with an angle of 208). The catch is retained in a net Furthermore, in some years clearly defined rings may not be bag 2.5 m long with diamond mesh size of 25 mm for formed (Anwar et al. 1990). In some species, age can also be further details on the dredge design, characteristics and estimated by counting the growth lines visible in acetate dimensions, see (Gaspar et al. 2003); (Leita˜o et al. 2009). peel replicas of the umbonal region of the shell (e.g. Anwar In order to assess its influence on the growth of et al. 1990; Ridgway et al. 2011; Peharda et al. 2012). D. exoleta, data on seawater temperature along the Portuguese Information on the age and growth rate of D. exoleta is coast were provided by the Hydrographical Institute (IH). very scarce and limited to studies on population dynamics For this purpose were gathered data monitored during 2010 performed in Norway by Tunberg (1979). Initially, this by the oceanographic buoys closest to the bivalve collect- author attempted to find annually deposited growth marks ing sites (buoys of Leixo˜es in the northern coast, Sines in in the shells, using surface rings and acetate peels, but both the southwestern coast and Faro in the southern coast). ageing techniques were unsuccessful (Tunberg 1979). Mean annual temperature was compared between study Later, an in situ experiment with marked individuals was areas through analysis of variance (ANOVA). If ANOVA performed, but results were not satisfactory due to distur- assumptions (normality of data and homogeneity of vari- bance of the studied specimens and to the weakness of the ances) were not met, the nonparametric Kruskal–Wallis regression analysis (Tunberg 1983a). Once again, both test (ANOVA on ranks) was performed. Whenever sig- surface rings and acetate peels were analysed; however, it nificant differences were detected by ANOVA or Kruskal– was impossible to establish an acceptable correlation Wallis test, pairwise multiple comparisons were made between the number of growth marks and individual age using Tukey or Dunn’s tests, respectively (Zar 1999). (Tunberg 1983a). Statistical analyses were performed with the software Taking into account the current scarcity of information, package SigmaStatÓ (version 3.5) with significance con- this study aimed at improving the knowledge on the age sidered for P \ 0.05. and growth of D. exoleta by providing data on shell In the laboratory, a total of 50 individuals from each banding, age and growth rate estimates for three popula- collecting site were measured for shell length (SL) (max- tions from the Portuguese coast (Aveiro in the north, imum distance along the anterior–posterior axis) to Setu´bal in the southwest and Faro in the south). Two the nearest 0.1 mm using a digital calliper. Specimens techniques (surface rings and acetate peels) were employed analysed were within the following SL (ranges Ave- and compared in order to ascertain which is the most iro = 40.4–46.8 mm (42.5 ± 1.7 mm); Setu´bal = 41.7– suitable for ageing this species. This study allowed 52.0 mm (46.7 ± 3.1 mm); Faro = 36.9–44.3 mm assessing the occurrence of latitudinal variation in the (41.0 ± 2.1 mm)). Subsequently, for estimating age and growth parameters of D. exoleta along the Portuguese growth, the rings deposited on the external surface of the coast, as well as comparing growth parameters between shells were counted and measured with the digital calliper. fishery-exploited (Aveiro) and unexploited (Setu´bal and In addition, the internal structure of each shell was ana- Faro) populations of this species. Finally, the overall lysed using acetate peel replicas of polished and etched growth performance (OGP) was compared among popu- sections of resin-embedded valves, following the technique lations of D. exoleta and with analogous information previously adopted with success in other commercially available for other venerid species worldwide. exploited bivalve species from the Portuguese coast (for 123 Helgol Mar Res (2013) 67:639–652 641 42 30 Aveiro: 15.4 ± 1.8ºC (11.4 – 20.4ºC) N 25 20 15 Aveiro Seawater temperature (ºC) temperature Seawater 10 30 ± 40 Setúbal: 17.3 1.2ºC (15.1 – 21.2ºC) 25 20 Portugal Latitude (ºN) Latitude 15 Seawater temperature (ºC) temperature Seawater 10 Setúbal 30 Faro: 20.2 ± 3.1ºC (14.6 – 26.6ºC) 25 38 20 15 Faro Seawater temperature (ºC) temperature Seawater 10 J FMAMJ J AS OND 9 8 Longitude (ºW) Fig.
Load more

Recommended publications
  • Physiological Effects and Biotransformation of Paralytic
    PHYSIOLOGICAL EFFECTS AND BIOTRANSFORMATION OF PARALYTIC SHELLFISH TOXINS IN NEW ZEALAND MARINE BIVALVES ______________________________________________________________ A thesis submitted in partial fulfilment of the requirements for the Degree of Doctor of Philosophy in Environmental Sciences in the University of Canterbury by Andrea M. Contreras 2010 Abstract Although there are no authenticated records of human illness due to PSP in New Zealand, nationwide phytoplankton and shellfish toxicity monitoring programmes have revealed that the incidence of PSP contamination and the occurrence of the toxic Alexandrium species are more common than previously realised (Mackenzie et al., 2004). A full understanding of the mechanism of uptake, accumulation and toxin dynamics of bivalves feeding on toxic algae is fundamental for improving future regulations in the shellfish toxicity monitoring program across the country. This thesis examines the effects of toxic dinoflagellates and PSP toxins on the physiology and behaviour of bivalve molluscs. This focus arose because these aspects have not been widely studied before in New Zealand. The basic hypothesis tested was that bivalve molluscs differ in their ability to metabolise PSP toxins produced by Alexandrium tamarense and are able to transform toxins and may have special mechanisms to avoid toxin uptake. To test this hypothesis, different physiological/behavioural experiments and quantification of PSP toxins in bivalves tissues were carried out on mussels ( Perna canaliculus ), clams ( Paphies donacina and Dosinia anus ), scallops ( Pecten novaezelandiae ) and oysters ( Ostrea chilensis ) from the South Island of New Zealand. Measurements of clearance rate were used to test the sensitivity of the bivalves to PSP toxins. Other studies that involved intoxication and detoxification periods were carried out on three species of bivalves ( P.
    [Show full text]
  • Surf Clams 1. Introduction
    SURF CLAMS SURF CLAMS Surf clam is a generic term used here to cover the following seven species: Deepwater tuatua, Paphies donacina (PDO) Fine (silky) dosinia, Dosinia subrosea (DSU) Frilled venus shell, Bassina yatei (BYA) Large trough shell, Mactra murchisoni (MMI) Ringed dosinia, Dosinia anus (DAN) Triangle shell, Spisula aequilatera (SAE) Trough shell, Mactra discors (MDI) The same FMAs apply to all these species and this introduction will cover issues common to all of these species. All surf clams were introduced into the Quota Management System on 1 April 2004. The fishing year is from 1 April to 31 March and commercial catches are measured in greenweight. There is no minimum legal size (MLS) for surf clams. Surf clams are managed under Schedule 6 of the Fisheries Act 1996. This allows them to be returned to the sea soon after they are taken provided they are likely to survive. 1. INTRODUCTION Commercial surf clam harvesting before 1995–96 was managed using special permits. From 1995–96 to 2002–03 no special permits were issued because of uncertainty about how best to manage these fisheries. New Zealand operates a mandatory shellfish quality assurance programme for all bivalve shellfish grown and harvested in areas for human consumption. Shellfish caught outside this programme can only be sold for bait. This programme is based on international best practice and is managed by the New Zealand Food Safety Authority (NZFSA), in cooperation with the District Health Board Public Health Units and the shellfish industry1. This involves surveying the water catchment area for 1. For full details of this programme, refer to the Animal Products (Regulated Control Scheme-Bivalve molluscan Shellfish) Regulations 2006 and the Animal Products (Specifications for Bivalve Molluscan 1270 SURF CLAMS pollution, sampling water and shellfish microbiologically over at least 12 months, classifying and listing areas for harvest, regular monitoring of the water and shellfish, biotoxin testing, and closure after rainfall and when biotoxins are detected.
    [Show full text]
  • Caracterização E Mapeamento De Marcadores Moleculares Em Espécies Da Família Veneridae De Interesse Comercial Em Portugal E Espanha
    Caracterização e mapeamento de marcadores moleculares em espécies da família Veneridae de interesse comercial em Portugal e Espanha. Estudo da hibridação entre Ruditapes 2012 decussatus e Ruditapes philippinarum JOANA CARRILHO RODRIGUES DA SILVA Tese de Doutoramento em Ciências Biomédicas Junho de 2012 Caracterização e mapeamento de marcadores moleculares em espécies da família Veneridae de interesse comercial em Portugal e Espanha. Estudo da hibridação entre Ruditapes decussatus e Ruditapes philippinarum JOANA CARRILHO RODRIGUES DA SILVA Tese de Doutoramento em Ciências Biomédicas Junho de 2012 Joana Carrilho Rodrigues da Silva Caracterização e mapeamento de marcadores moleculares em espécies da família Veneridae de interesse comercial em Portugal e Espanha. Estudo da hibridação entre Ruditapes decussatus e Ruditapes philippinarum Tese de Candidatura ao grau de Doutor em Ciências Biomédicas submetida ao Instituto de Ciências Biomédicas Abel Salazar da Universidade do Porto. Orientadora – Prof. Doutora Maria Isabel da Silva Nogueira Bastos Malheiro Categoria – Professora Associada (com Nomeação Definitiva) Afiliação – Instituto de Ciências Biomédicas Abel Salazar da Universidade do Porto. Co-orientadores: Doutora Alexandra Maria Bessa Ferreira Leitão-Ben Hamadou Categoria – Investigadora Auxiliar Afiliação – Instituto Nacional de Recursos Biológicos (INRB/L-IPIMAR) Prof. Doutor Juan José Pasantes Ludeña Categoria – Professor Titular Universidade Afiliação – Dpto. de Bioquímica, Xenética e Inmunoloxía, Universidade de VIgo This thesis was funded by Fundação para a Ciência e Tecnologia (FCT) - Ministério da Ciência, Tecnologia e Ensino Superior, with a PhD. grant, ref: SFRH/BD/35872/2007. It was also partially supported by grants from Xunta de Galicia and Fondos FEDER (PGI- DIT03PXIC30102PN; 08MMA023310PR; Grupos de Referencia Competitiva, 2010/80) and Universidade de Vigo (64102C124), and also by PTDC/MAR/72163/2006: FCOMP- 01-0124-FEDER-007384 of the FCT.
    [Show full text]
  • <I>Dosinia Elegans</I>
    A CONTRIBUTION TO THE ECOLOGY OF THE LAMELLIBRANCH DOSINIA ELEGANS1 HILARY B. MOORE AND NELIA N. L6PEZ University of Miami, Rosenstiel School of Marine and Atmospheric Sciences ABSTRACT Dosinia elegans is a venerid which is a constituent of sublittoral soft- bottom communities in Biscayne Bay, Florida. There are two settlements of young in the course of the year. A length of about ] 5 mm is reached in a year, and an animal with the maximum size of 25 to 30 mm is 2 to 3 years old. A mortality rate of 80 per cent per annum has been estimated. On the grounds studied, the biomass of Dosinia averaged 102 mg per square meter, and this produced the very high spawn output of J 60 mg. The ratio of annual productivity to standing crop was 2.8, which is about midway in the range of comparable local species. The growth rate was lower than that of most of these species. This study is based on materials collected in shallow sublittoral areas in Biscayne Bay from November 1963 to the present time. These areas and the methods employed have already been sufficiently described by Moore & Lopez (1966), and in reports of earlier studies of McNulty et al. (1962a, 1962b), on which we have drawn for some information. This study was initiated under grant number WP-00573 from the Public Health Service, later from the Federal Water Quality Administration, and continued under grant number WP-01433 from the latter agency. We are grateful to the agencies for their support and encouragement and also to many members of the Rosenstiel School who have shared in the work.
    [Show full text]
  • Bivalve ¢Shing and Maerl-Bed Conservation in France and the UK}Retrospect and Prospect
    AQUATIC CONSERVATION: MARINE AND FRESHWATER ECOSYSTEMS Aquatic Conserv: Mar. Freshw. Ecosyst. 13: S33–S41 (2003) Published online in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/aqc.566 Bivalve ¢shing and maerl-bed conservation in France and the UK}retrospect and prospect J.M. HALL-SPENCERa,*, J. GRALLb, P.G. MOOREc and R.J.A. ATKINSONc a School of Biological Sciences, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, UK b Institut Universitaire Europeeen! de la Mer, LEMAR UMR-CNRS 6539, Place Copernic, Plouzane, France c University Marine Biological Station, Millport, Isle of Cumbrae, KA28 0EG, UK ABSTRACT 1. Maerl beds are carbonate sediments, built by a surface layer of slow-growing coralline algae, forming structurally fragile habitats. 2. They are of international conservation significance, often supporting a high biodiversity and abundant bivalve molluscs. 3. Experimental fishing for scallops (Pecten maximus) on French and UK grounds has shown that although large epifauna are often killed, many organisms escape harm as they burrow deeply or are small enough to pass through the dredges. 4. Bivalve dredging is currently one of the main threats to European maerl grounds as it reduces their biodiversity and structural complexity and can lead to long-term degradation of the habitat. 5. Protecting maerl grounds is of importance for fisheries since they provide structurally complex feeding areas for juvenile fish (e.g. Atlantic cod - Gadus morhua) and reserves of commercial brood stock (e.g. Ensis spp., P. maximus and Venus verrucosa). 6. We outline improved mechanisms to conserve these ancient and unique biogenic habitats. Copyright # 2003 John Wiley & Sons, Ltd.
    [Show full text]
  • Stratigraphical Notes on Macoma (Bivalvia) in the Southern Part of the North Sea Basin and Some Remarks on the Arrival of Pacific Species
    Stratigraphical notes on Macoma (Bivalvia) in the southern part of the North Sea Basin and some remarks on the arrival of Pacific species T. Meijer T. Meijer. Stratigraphical notes on Macoma (Bivalvia) in the southern part of the North Sea Basin and some remarks on the arrival of Pacific species. — Scripta Geol., Spec. Issue 2: 297-312, 2 Figs., Leiden, December 1993. T. Meijer, Rijks Geologische Dienst, Postbus 157, 2000 AD Haarlem, The Netherlands. Key words: Neogene, Quaternary, North Sea Basin, Pacific immigration, Bivalvia, Macoma. The stratigraphical occurrence in the southern North Sea Basin of the marine bivalve genus Macoma is reviewed. New data concerning first and last appearances are presented. Especially the first appearance of Macoma balthica and the last appearances of M. obliqua and M. praetenuis are discussed. M. balthica appears in the late Middle Tiglian (Early Pleistocene). M. obliqua has been found in offshore deposits dating from the climatic optimum of the last interglacial, the Eemian. M. praetenuis occurs in deposits just underlying the Eemian deposits. The age of these underlying deposits is uncertain but may be Late Saalian/Early Eemian. Both latter species were previously considered to be extinct after the late Middle Tiglian. The age of the arrival of 'Pacific' species in the North Sea Basin in the Pliocene is briefly dis• cussed. Contents Introduction 297 Discussion of the species 298 Conclusions 306 Remarks on the first appearance of Pacific species in the North Sea 309 References 309 Introduction In Neogene and Quaternary deposits of the southern North Sea Basin the marine bivalve genus Macoma (s.s.) is represented with the following four species: Macoma balthica (Linné, 1758) Macoma calcarea (Gmelin, 1791) Macoma obliqua (Sowerby, 1817) Macoma praetenuis (Leathes in Woodward, 1833).
    [Show full text]
  • Venerid Bibliography References for the "Generic Names" Database As Well As Other Selected Works on the Family Veneridae
    PEET Bivalvia Venerid Bibliography References for the "Generic Names" database as well as other selected works on the family Veneridae Accorsi Benini, C. (1974). I fossili di Case Soghe - M. Lungo (Colli Berici, Vicenza); II, Lamellibranchi. Memorie Geopaleontologiche dell'Universita de Ferrara 3(1): 61-80. Adachi, K. (1979). Seasonal changes of the protein level in the adductor muscle of the clam, Tapes philippinarum (Adams and Reeve) with reference to the reproductive seasons. Comparative Biochemistry and Physiology 64A(1): 85-89 Adams, A. (1864). On some new genera and species of Mollusca from the seas of China and Japan. Annals and Magazine of Natural History 13(3): 307-310. Adams, C. B. (1845). Specierum novarum conchyliorum, in Jamaica repertorum, synopsis. Pars I. Proceedings of the Boston Society of Natural History 12: 1-10. Ahn, I.-Y., G. Lopez, R. E. Malouf (1993). Effects of the gem clam Gemma gemma on early post-settlement emigration, growth and survival of the hard clam Mercenaria mercenaria. Marine Ecology -- Progress Series 99(1/2): 61-70 (2 Sept.) Ahn, I.-Y., R. E. Malouf, G. Lopez (1993). Enhanced larval settlement of the hard clam Mercenaria mercenaria by the gem clam Gemma gemma. Marine Ecology -- Progress Series 99(1/2): 51-59 Alemany, J. A. (1986). Estudio comparado de la microestructura de la concha y el enrollamiento espiral en V. decussata (L. 1758) y V. rhomboides (Pennant, 1777) (Bivalvia: Veneridae). Bollettino Malacologico 22(5-8): 139-152. Alemany, J. A. (1987). Estudio comparado de la microestructura de la concha y el enrollamiento espiral en Dosinia exoleta (L.
    [Show full text]
  • The Manila Clam Ruditapes Philippinarum (Adams & Reeve, 1850) in the Tagus Estuary (Portugal)
    Aquatic Invasions (2017) Volume 12, Issue 2: 133–146 Open Access DOI: https://doi.org/10.3391/ai.2017.12.2.02 © 2017 The Author(s). Journal compilation © 2017 REABIC Research Article Age and growth of a highly successful invasive species: the Manila clam Ruditapes philippinarum (Adams & Reeve, 1850) in the Tagus Estuary (Portugal) Paula Moura1, Lucía L. Garaulet2, Paulo Vasconcelos1,3, Paula Chainho2, José Lino Costa2,4 and Miguel B. Gaspar1,5,* 1Instituto Português do Mar e da Atmosfera (IPMA, I.P.), Avenida 5 de Outubro s/n, 8700-305 Olhão, Portugal 2MARE – Centro de Ciências do Mar e do Ambiente, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal 3Centro de Estudos do Ambiente e do Mar (CESAM), Departamento de Biologia, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal 4Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal 5Centro de Ciências do Mar (CCMAR), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal *Corresponding author E-mail: [email protected] Received: 3 November 2016 / Accepted: 4 May 2017 / Published online: 23 May 2017 Handling editor: Philippe Goulletquer Abstract The Manila clam Ruditapes philippinarum (Adams & Reeve, 1850) was introduced in several regions worldwide where it is permanently established. In Portuguese waters, the colonisation of the Tagus Estuary by this invasive species coincided with a significant decrease in abundance of the native Ruditapes decussatus (Linnaeus, 1758). This study aimed to estimate the age and growth of the Manila clam, to compare the growth performance between R.
    [Show full text]
  • Channel Island Marine Molluscs
    Channel Island Marine Molluscs An Illustrated Guide to the Seashells of Jersey, Guernsey, Alderney, Sark and Herm Paul Chambers Channel Island Marine Molluscs - An Illustrated Guide to the Seashells of Jersey, Guernsey, Alderney, Sark and Herm - First published in Great Britain in 2008 by Charonia Media www.charonia.co.uk [email protected] Dedicated to the memory of John Perry © Paul Chambers, 2008 The author asserts his moral right to be identified as the Author of this work in accordance with the Copyright, Designs and Patents Act, 1988. All rights reserved. No part of this book may be reproduced or transmitted in any form or by any means, electronic or mechanical including photocopying, recording or by any information storage and retrieval system, without permission from the Publisher. Typeset by the Author. Printed and bound by Lightning Source UK Ltd. ISBN 978 0 9560655 0 6 Contents Introduction 5 1 - The Channel Islands 7 Marine Ecology 8 2 - A Brief History of Channel Island Conchology 13 3 - Channel Island Seas Shells: Some Observations 19 Diversity 19 Channel Island Species 20 Chronological Observations 27 Channel Island First Records 33 Problematic Records 34 4 - Collection, Preservation and Identification Techniques 37 5 - A List of Species 41 Taxonomy 41 Scientific Name 42 Synonyms 42 Descriptions and Illustrations 43 Habitat 44 Distribution of Species 44 Reports of Individual Species 45 List of Abbreviations 47 PHYLUM MOLLUSCA 49 CLASS CAUDOFOVEATA 50 CLASS SOLENOGASTRES 50 ORDER NEOMENIAMORPHA 50 CLASS MONOPLACOPHORA
    [Show full text]
  • Nemertea: Hoplonemertea) Jose E F Alfaya1,2, Gregorio Bigatti1,2, Hiroshi Kajihara3, Malin Strand4, Per Sundberg5 and Annie Machordom6*
    Alfaya et al. Zoological Studies (2015) 54:10 DOI 10.1186/s40555-014-0086-3 RESEARCH Open Access DNA barcoding supports identification of Malacobdella species (Nemertea: Hoplonemertea) Jose E F Alfaya1,2, Gregorio Bigatti1,2, Hiroshi Kajihara3, Malin Strand4, Per Sundberg5 and Annie Machordom6* Abstract Background: Nemerteans of the genus Malacobdella live inside of the mantle cavity of marine bivalves. The genus currently contains only six species, five of which are host-specific and usually found in a single host species, while the sixth species, M. grossa, has a wide host range and has been found in 27 different bivalve species to date. The main challenge of Malacobdella species identification resides in the similarity of the external morphology between species (terminal sucker, gut undulations number, anus position and gonad colouration), and thus, the illustrations provided in the original descriptions do not allow reliable identification. In this article, we analyse the relationships among three species of Malacobdella: M. arrokeana, M. japonica and M. grossa, adding new data for the M. grossa and reporting the first for M. japonica, analysing 658 base pairs of the mitochondrial cytochrome c oxidase subunit I gene (COI). Based on these analyses, we present and discuss the potential of DNA barcoding for Malacobdella species identification. Results: Sixty-four DNA barcoding fragments of the mitochondrial COI gene from three different Malacobdella species (M. arrokeana, M. japonica and M. grossa) are analysed (24 of them newly sequenced for this study, along with four outgroup specimens) and used to delineate species. Divergences, measured as uncorrected differences, between the three species were M.
    [Show full text]
  • Composite Prismatic Structure in Bivalve Shell
    Acta Palaeontologica Polonica Vol. 31, No. 1-2 pp. S26; pls. 1-14 Warszawa, 1986 SERGE1 V. POPOV COMPOSITE PRISMATIC STRUCTURE IN BIVALVE SHELL POPOV, S. V. Composite prismatic structure in bivalve shell. Acta Palaeont. Polonica, 31, 1-2, 3-28, 1986. Composite prismatic stru&ure has been examined in Nuculidae, Lucinidae, Cardi- idae, Tellinidae, Psammobiidae, Donacidae and Veneridae. This microstructure is divided into three basic structural varieties: typical composite prismatic, charac- teristic of Nuculidae (Nucula); fibrous composite prismatic, observed in Cardiidae. Tellinidae, Psammobiidae; and compound composite prismatic mainly characteristic of Donacidae and Veneridae. The observed differences within the structure, the orientation of prisms and the growth pattern are genetically determined. They may considerably supplement the criteria on which the taxonomy of the group is based. At the same time there exist phenotypic, environmentally controlled structural differences. K e. y w o r d s: Bivalves, shell microstructure, prismatic layer. Serget V. Popov. Paleontologtcal Instttute of the USSR Academy of Sciences. Pzofsoycznaya 113, 117868 Moskva. USSR. V-321. Received: March 1985. INTRODUCTION Cmposite prismatic structure forms the outer carbonate shell layer of some bivalve molluscs. This type of microstructure is one of the most complicated. This term is not interpreted synonymously by different scien- tists. Boggild (1930) first suggested it to be a variety of prismatic structure and defined it as the structure which "consists of larger prisms (prisms of the first order) each of them being composed of fine prisms (of the second order)... The prisms of the first order are placed horizontally, in the radial direction, and only form one layer; the prisms of the second order diverge towards the margin.
    [Show full text]
  • Dosinia Erythraea Ordine Veneroida Romer, 1860 Famiglia Veneridae
    Identificazione e distribuzione nei mari italiani di specie non indigene Classe Bivalvia Dosinia erythraea Ordine Veneroida Romer, 1860 Famiglia Veneridae SINONIMI RILEVANTI DESCRIZIONE COROLOGIA / AFFINITA’ Senza dati. Conchiglia di medie dimensioni, equivalve, equilaterale. Margine esterno piuttosto circolare lungo quanto alto. Negli individui vecchi diventa DISTRIBUZIONE ATTUALE più lungo. Lunula fortemente impressa. La Mar Rosso, Mediterraneo: Egitto, Grecia scultura si presenta come anelli concentrici equamente spaziati, piuttosto elevati, che possono PRIMA SEGNALAZIONE IN MEDITERRANEO diventare irregolari sul margine posteriore. 1905 Egitto (Tillier and Bavay, 1905) COLORAZIONE Varia dal bianco al beige, di solito con righe PRIMA SEGNALAZIONE IN ITALIA radiali brune. L’interno della conchiglia è bianco. - FORMULA MERISTICA ORIGINE TAGLIA MASSIMA Mar Rosso. STADI LARVALI VIE DI DISPERSIONE PRIMARIE SPECIE SIMILI Canale di Suez. Dosinia exoleta VIE DI DISPERSIONE SECONDARIE CARATTERI DISTINTIVI - Dosinia erythraea è molto simile alla specie mediterranea Dosinia exoleta Linnaeus, 1758. Differisce dalla specie mediterranea per la STATO DELL ’INVASIONE presenza di cerchi concentrici elevati. Identificazione e distribuzione nei mari italiani di specie non indigene HABITAT MOTIVI DEL SUCCESSO Sconosciuto Nel Golfo di Suez è molto frequente nei canali di comunicazione con il lago Timsah (Moazzo, 1939). SPECIE IN COMPETIZIONE - PARTICOLARI CONDIZIONI AMBIENTALI IMPATTI Sconosciute. - DANNI ECOLOGICI BIOLOGIA - Vive nei sedimenti. E’ un abile filtratore e la sua biologia è molto simile a quella delle altre specie della famiglia Veneridae. DANNI ECONOMICI - IMPORTANZA PER L ’UOMO Commestibile BANCA DEI CAMPIONI - PRESENZA IN G -BANK - PROVENIENZA DEL CAMPIONE TIPOLOGIA : (MUSCOLO / ESEMPLARE INTERO / CONGELATO / FISSATO ECC ) LUOGO DI CONSERVAZIONE CODICE CAMPIONE Identificazione e distribuzione nei mari italiani di specie non indigene BIBLIOGRAFIA Manousis T., Mpardakis G., Paraskevopoulos C.
    [Show full text]