DOCSLIB.ORG

THE BRACKISH WATER CLAM RANGIA CUNEATA AS INDICATOR of ECOLOGICAL EFFECTS of SALINITY CHANGES in COASTAL WATERS by S

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
THE BRACKISH WATER CLAM RANGIA CUNEATA AS INDICATOR of ECOLOGICAL EFFECTS of SALINITY CHANGES in COASTAL WATERS by S CONTRACT REPORT H-73-1 THE BRACKISH WATER CLAM RANGIA CUNEATA AS INDICATOR OF ECOLOGICAL EFFECTS OF SALINITY CHANGES IN COASTAL WATERS by S. H. Hopkins, J. W. Anderson, K. Horvath i s a ? m <=? IDI L XT Lr u mlM lio i rt> i III muss/BttK ;-V-sasa June 1973 Sponsored by Office, Chief of Engineers, U. S. Army Conducted for U. S. Army Engineer Waterways Experiment Station Vicksburg, Mississippi Under Contract No. DACW39-7I-C-0007 By Department of Biology, Research Foundation, Texas A<S*M University, College Station, Texas , APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED B è ï ï a r y Au g 3 1973 Bureau of Reclamation Denver, Colorado - ..f e :■' \ ".T ” V Destroy this report when no longer needed. Do not return it to the originator. The findings in this report are not to be construed as an officia Department of the Army position unless so designated by other authorized documents. 92041911 THE ^BRACKISH WATER CLAM RANGIA CUNEATA AS INDICATOR OF ECOLOGICAL EFFECTS OF SALINITY CHANGES IN COASTAL WATERS3 by £ S. H. Hopkins, J. W. Anderson, K. Horvath — SCI J 101 I0I[ DÌ00101 June 1973 Sponsored by Office, Chief of Engineers, U. S. Army Conducted for U. S. Army Engineer Waterways Experiment Station Vicksburg, Mississippi Under Contract No. DACW39-7I-C-0007 By Department of Biology, Research Foundation, Texas A<5kM University, College Station, Texas ARMY-MRC VICKSBURG. MISS. APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED L FOREWORD This report was prepared under Contract No. DACW39-71-C-0007 with the Department of Biology, Texas A&M University Research Foundation, College Station, Texas, for the U. S. Army Engineer Waterways Experiment Station (WES). This report was written by Dr. S. H. Hopkins, assisted by the following people, who participated in the investigation. Dr. Jack W. Anderson directed the work on the physiology of Rangia cuneata and some of the work on reproduction and development; Brian Bedford did the major part of the physiological work for a Ph. D. dissertation; and students Susan Baldwin, Thomas M. Dillon, and Glen Michael Hightower aided in the work on physiology and on reproduction, development, and growth. Dr. Kalman Horvath directed the work on the biochemistry of Rangia, also on the ciliary activity and on the measurements from which the condition index was calculated; he was assisted by students Michael P. Klett and Lynn W. Jagers in the physical measurements and the biochemical work and by Kathleen Hooper Julicher in measurements of ciliary activity. C. A. Bedinger collected many of the clams, made a number of ecological observations, and got well along in a study of some biochemical parameters in relation to season and salinity, but did not have his biochemical results complete enough to include in this re- port; he also participated in the study of reproduction and larval de­ velopment. Melvin R. Frei, working in Dr. Horvath's laboratory, com­ pleted a study of crystalline style enzymes in three different popula­ tions of Rangia cuneata, which he used for his Ph. D. dissertation. Jack M. Neagle studied the parasites of these three populations. The introduction, the review of the natural history, and the overall dis­ cussion and conclusions were written by Dr. Hopkins. The typist was Ruth Peschke. The contract was monitored by Mr. F. A. Herrmann, Jr., Chief of the Estuaries Division, under the general supervision of Mr. H. B. Simmons, Chief of the Hydraulics Laboratory. iii Director of WES during the conduct of this study and the publica­ tion of this report was COL Ernest D. Peixotto, CE. Technical Director was Mr. F. R. Brown. iv TABLE OF CONTENTS Page FOREWORD ................................................ i ü SUMMARY ................................................. ix INTRODUCTION ............................................ 1 NATURAL HISTORY .............. 6 Zoology of Rangia .................. 6 Population Density .................................. H Biomass .............................................. 13 Commercial Value ............. 15 Reproduction, Development and Setting ........................................ 17 Growth ............................................... 21 Food and Feeding ................ 25 Fauna of the Rangia Zone ............... 27 Predation ........... 34 Parasites ............................................ 36 Bottom Type Inhabited ............................... 37 Temperature Relations ............................... 38 Salinity Relations ................................... 42 DESCRIPTION OF THE STUDY AREAS ......................... 43 Trinity River Delta-Trinity Bay ........ 43 Trinity Bay .......................................... 44 Trinity River Delta .................................. 47 Lake Anahuac ......... 49 The Neches River ................ 50 PHYSIOLOGICAL STUDIES ON EFFECTS OF SALINITY .......... 57 General Introduction............. 57 General Methods and Materials ......... 58 Effect of Salinity on Blood Osmotic Concentration, Per Cent Water, and Per Cent Ash .................. 59 1. Introduction ................................... 59 2. Materials and Methods ......................... 60 v a. Osmoregulation ........................... 60 b. Body water percentage and ash percentage... 61 3. Results 61 a. Osmoregulation ............................ 61 b. Per cent body water and per cent ash ...... 66 4. Discussion .................................... 70 Effects of Salinity on the Uptake and Accumulation of Glycine .......................................... 75 1. Introduction ................... 75 2. Materials and Methods ........................ 75 a. Uptake of glycine .......................... 75 3. Results .................. 79 a. Uptake of glycine by whole animals ....... 79 b. Uptake of glycine by isolated gill tissue.. 84 c. Velocity of glycine uptake .......... 84 d. Fate of accumulated glycine .............. 89 4. Discussion .................................... 97 Effects of Salinity and Temperature on Respiration... 100 1. Introduction ................................... 100 2. Materials and Methods ......................... 100 a. Whole animal respiration .................. 100 b. Gill respiration .......................... 102 3. Results ........................................ 103 a. Whole animal respiration .................. 103 b. Gill respiration................ 112 4. Discussion .......... 117 Effect of Salinity on Glycogen Utilization by Rangia. 120 1. Introduction ...................... 120 2. Materials and Methods ....................... • 120 3. Results ................. 121 4. Discussion.... ............................... 121 vi Page Effect of Salinity on Feeding .......... 125 1. Introduction ........................ 125 2. Materials and Methods .......... 126 3. Results ...................................... 128 4. Discussion ...... 135 Effects of Salinity on Reproduction, Larval Development and Growth ............................ 136 1. Introduction ................................... 136 2. Materials and Methods .......................... 137 3. Results ...••................................... 138 4. Discussion ..................................... 147 Phytoplankton Studies ................................ 149 1. Introduction ................................... 149 2. Materials and Methods ........................ 149 3. Results .............. 150 4 • Discussion...... .............................. 150 SOME INDICES OF SEASONAL AND ENVIRONMENTAL EFFECTS .... 153 Effects of Salinity and Temperature on Ciliary Activity ................ 153 Introduction ....................................... 153 Methods ........ 153 Results and Discussion ............................ 154 Dissolved Carbohydrate Uptake by Rangia ............. 158 Introduction ................................. 158 Methods ............................................ 158 Results ........... 159 Seasonal Physical-Chemical Parameters of the Com­ position of Rangia ........................ 163 Introduction .................................... 163 Methods ............... 163 Results ............................................ 164 vii Page COMPARATIVE STUDIES OF CRYSTALLINE STYLE ENZYME ACTIVITY IN POPULATIONS FROM WATERS OF DIF­ FERENT SALINITY .................................. 172 Introduction and Literature Review .............. 172 Materials and Methods ......... 174 Results and Discussion .......................... 176 Chlorinity ................... 178 Incubation Time ............................... 187 Ionic Effects .................................. 200 Conclusions ...................................... 205 OVERALL SUMMARY AND DISCUSSION ..................... 212 CONCLUSIONS ......................................... 220 REFERENCES CITED ..... 224 OTHER RANGIA REFERENCES ............................ 245 ADDENDA ................. 250 viii SUMMARY It was apparent to Dr. S. H. Hopkins, a consultant for the Corps of Engineers on the effects of engineering works on biota of coastal waters, that there was seldom as much information on the ecology of estuarine organisms as was needed to predict the effects of environ­ mental changes. The ecology of oysters comes close to being an excep­ tion. Oysters have been the subject of literally thousands of scien­ tific publications. Enough information has been accumulated on their biology and that of their competitors, pests, predators, and parasites to permit fairly confident predictions as to how and how much they will be affected by a given change in the environment, e.g., a rise or drop of 10 ppt (parts per thousand)
Load more

Recommended publications
  • Short Nosed Sturgeon
    Connecticut River Coordinator's Office: Fish Facts - Shortnose Sturgeon Page 1 of 3 Skip navigation links Fish Facts - Shortnose Sturgeon z Description z Life History z Distribution z Status z Restoration Efforts Download a Fact Sheet (85 KB Adobe pdf file) You will need Adobe Acrobat Reader software to open the document above. If you do not have this software, you may obtain it free of charge by following this link. Description The shortnose sturgeon (Acipenser brevirostrum) is one of two sturgeon species in the Connecticut River; the other is the Atlantic sturgeon. The shortnose is the smaller of the two, growing to be 2 to 3 feet in length and about 14 pounds in weight. Sturgeons are an ancient species with fossils dating back 65 million years. They are very distinctive, looking like a prehistoric cross between a shark and a catfish. Sturgeons lack teeth and scales but have a unique body armor of diamond-shaped bony plates called scutes. Some have been found to be over 60 years old. Life History Shortnose sturgeon are typically anadromous, migrating from the ocean to fresh water specifically to reproduce. However, of the two populations in the Connecticut River system (formed by the construction of dams), one is considered to be partially landlocked and the other is likely to be http://www.fws.gov/r5crc/Fish/zf_acbr.html 1/3/2007 Connecticut River Coordinator's Office: Fish Facts - Shortnose Sturgeon Page 2 of 3 amphidromous, moving between fresh and salt water. Shortnose reproduce in the spring. They broadcast their eggs in areas with rubble substrate.
    [Show full text]
  • No. 8. September 2014
    No 8, September 2014 News from the NOBANIS secretariat The secretary at NOBANIS Christina Fevejle Nielsen, started on her new job in the Nature Agency, Danish Ministry of Environment in December 2013, and Maya Helene Quaade Caspersen has since January 2014 been the new secretary at NOBANIS, with a current contract until February 2015. Maya has a master degree in biology from the University of Copenhagen, and has experience with IAS from working with regulation in Denmark. As the new secretary of NOBANIS, I would like to take this opportunity to thank all partners for welcoming me, and for the good collaboration the last couple of months. This year I will continue the work with revising the database that Helene started and finish the update of the remaining fact sheets. Another project that will have my attention in 2014 is the ATAN project “Achieving the Aichi Target 9, IAS in the Nordic and Baltic region”. Read more about the project further down. 10 years with NOBANIS (2004-2014) This year NOBANIS can celebrate its 10th anniversary. Here is a short summary with background information and achievements of the network (2004-2014) The Nordic-Baltic Network on Invasive Alien Species (NOBANIS) was initiated as a project funded by the Nordic Council of Ministers in 2004 to fulfilled parts of the CBD Decision VI/23, Guiding Principles for the prevention, introduction and mitigation of impacts of alien species that threaten ecosystems, habitats or species. The aim of the project was to develop a regional, distributed and interoperable network on the critical issue of invasive alien species (IAS) in the marine, freshwater and terrestrial environments and their consequences for biological diversity, the cultural landscape and outdoor life.
    [Show full text]
  • Mollusca) from Malta
    The Central Mediterranean Naturalist 4 (1): 35 - 40 Malta: December 2003 ON SOME ALIEN TERRESTRIAL AND FRESHWATER GASTROPODS (MOLLUSCA) FROM MALTA Constantine Mifsud!, Paul Sammut2 and Charles Cachia3 ABSTRACT Nine species of gastropod molluscs: Otala lactea (0. F. MUller, 1774); Cemuella virgata (da Costa, 1778); Cochlicella barbara (Linnaeus, 1758); Oxychilus helveticus (Blum, 1881); Succinea putris (Linnaeus, 1758); Oxyloma elegans (Risso, 1826); Helisoma duryi Wetherby, 1879; Planorbarius comeus (Linnaeus, 1758); and the limacid slug Lehmannia valentiana (A. Ferussac, 1822) are recorded for the first time as alien species from local plant nurseries. For each species a short description and notes on distribution and ecology are given. INTRODUCTION The land and fresh water Mollusca of the Maltese Islands have been recently well treated by Giusti et al. (1995). However, during the last twelve years many non-indigenous plants, shrubs and trees, both decorative species and fruit trees, have been imported from Europe either to embellish local gardens or roadsides or for agricultural purposes. It occurred to the authors that there is the possibility that alien species of molluscs might have been introduced accidentally with these imported plants. This is not a completely new phenomenon. For example, Pomatias elegans and Discus rotundatus occur at San Anton Gardens were they were probably alien introductions due to human activities (Thake, 1973). During recent research to assess the status of some of the endemic molluscs of the Maltese Islands, with special emphasis on the Limacidae, areas where imported plants are stocked were searched for any alien species. This resulted in the discovery of several alien species of terrestrial and freshwater snails, a few of them alive.
    [Show full text]
  • Revista Completa En
    Comercio mayorista de productos pesqueros Consumo de pescado en conserva Logística de grandes volúmenes Mejora de la protección de los consumidores y usuarios Comisiones por el uso de tarjetas de pago ICAN ^^ INSTITUTO DE CALIDAD AGROALIMENTARIA DE NAVARRA DISTINGUIMOS LA CALIDAD SEAN CUALES SEAN TUS GUSTOS, LOS PRODUCTOS NAVARROS TE CONVENCERÁN POR SU SABOR. , ^ f ^ ,, ^,, ^ ^ ^ f tiL Comercialización mayorista de productos pesqueros en España La posición de la Red de Mercas y del resto de canales José Ma Marcos Pujol y Pau Sansa Brinquis Análisis de las principales especies pesqueras comercializadas (111) José Luis Illescas, Olga Bacho y Susana Ferrer 24 Mejora de la protección de los consumidores y usuarios . , Mejillón 34 Análisis de los cambios •. Chirla y almejas 42 introducidos por la nueva ^•..• Pulpo 52 Calamar, calamar europeo Ley 44/2006 ..•. •^.• 1 . .^ • s• . Víctor Manteca Valdelande 122 .^ y chipirón 60 . ° :. _. •-a • . Choco, jibia o sepia 66 . •^ . ; ^• ^ ... Comisiones por el uso de . ^... .. Otros bivalvos 72 . ,^.^ . tarjetas de pago r.r.-e ^^..•••.. •. Análisis del consumo Pedro M. Pascual Femández 132 . .- .• •^ . de pescado en conserva ^ Víctor J. Martín Cerdeño 80 Alimentos de España 1 . Navarra 139 .•1 ^ . ., •• . De vides, vinos, vidueños ., . ,. , y planes estratégicos Distribución y Consumo inicia en este número , , Emilio Barco . 1 . una nueva sección, • _. : ._ ^. _ • bajo el título genérico de Alimentos de . ^^ La guerra de las temperaturas España, que analizará • ^I• , •, ^ Silvia Andrés González-Moralejo 109 la realidad alimentaria de todas las Logística de grandes volúmenes comunidades Sylvia Resa 116 autónomas. ^c.]uGLeLL°l ^ : .. .............................................. : 1 • ^^ . ^^ , ^ . Novedades legislativas 164 Notas de prensa /Noticias 166 . .. :^ :^. ^^•^ Mercados/Literaturas Irina '91SNi:I17P[K.77 :7Ti^?I^^l ^T-^^7 .^.1^.^ Lourdes Borrás Reyes :•^^^;;^ i^.^..i^l^:.^=.
    [Show full text]
  • And Brackish Water Environments What Is Brackish Water Brackish Water Is Water Which Contains More Sea Salts Than Freshwater but Less Than the Open Sea
    http://www.unaab.edu.ng COURSE CODE: FIS316 COURSE TITLE: Marine and Brackishwater Economic Resources NUMBER OF UNITS: 2 Units COURSE DURATION: Two hours per week COURSECOURSE DETAILS:DETAILS: Course Coordinator: Prof. Yemi Akegbejo‐Samsons Email: [email protected] Office Location: Room D210, COLERM Other Lecturers: Dr. D.O. Odulate COURSE CONTENT: Study of major marine and brackish water fin and shell fish species in relation to their development for culture, food and industrial uses. Methods of harvesting e.g. electro‐ fishing. COURSE REQUIREMENTS: This is a compulsory course for all students in Department of Aquaculture & Fisheries Management. In view of this, students are expected to participate in all the course activities and have minimum of 75% attendance to be eligible to write the final examination. READING LIST: E LECTURE NOTES 1. Study of major marine and brackish water fin and shell fish species in relation to their development for culture, food and industrial uses. 2. Methods of harvesting e.g. electro-fishing. This course is taught by Prof Yemi Akegbejo-Samsons and Dr D O Odulate. The venue for the interaction with students is on the ground floor of the College of Environmental Resources Management. Topic 1 Marine and Brackish water environments What is Brackish Water Brackish water is water which contains more sea salts than freshwater but less than the open sea. http://www.unaab.edu.ng Moreover, brackish water environments are also fluctuating environments. The salinity is variable depending on the tide, the amount of freshwater entering from rivers or as rain, and the rate of evaporation.
    [Show full text]
  • Caspian Sea, Estuarine, Zooplankton, Diversity, Physicochemical
    Advances in Life Sciences 2014, 4(3): 135-139 DOI: 10.5923/j.als.20140403.07 The Influence of Salinity Variations on Zooplankton Community Structure in South Caspian Sea Basin Estuary Maryam Shapoori1,*, Mansoure Gholami2 1Department of Fishery, College of Natural resources, Savadkooh Branch, Islamic Azad University, Savadkooh, Iran 2Department of Fishery, College of Natural resources, Sanandaj Branch, Islamic Azad University, Sanandaj, Iran Abstract In order to better understanding the impact of changes in salinity on zooplankton community structure, investigations on the physicochemical characteristics, phytoplankton, and zooplankton component of an estuarine zone in South-Eastern Caspian Sea was carried out for one year between March, 2011 and July, 2012. The study showed notable seasonal variation in the components investigated. Salinity and water flow rate regime seemed a major determinant of the composition, abundance and seasonal variation of encountered estuarine biota. Rain events associated with reducing salinities and inflow associated with decreasing salinities may be key hydro-meteorological forcing operating in the estuary. The collection of juvenile forms (Zooplankton) recorded probably points to the suitability of the estuary characteristics to serve as breeding ground and place of refuge for diverse aquatic species. Keywords Caspian Sea, Estuarine, Zooplankton, Diversity, Physicochemical levels within coastal aquatic ecosystems in south Caspian 1. Introduction Sea region. Salinity is amongst the most important environmental factors with the potential to significantly River mouths are common hydrological features of South- influence estuarine communities [11]. Therefore, Eastern features of Caspian Sea and form part of the fluctuations in salinity and other environmental factors (e.g. numerous ecological niches associated with the Caspian temperature, pH, nutrients and pigments) on both spatial and coastal environment.
    [Show full text]
  • The Marine and Brackish Water Mollusca of the State of Mississippi
    Gulf and Caribbean Research Volume 1 Issue 1 January 1961 The Marine and Brackish Water Mollusca of the State of Mississippi Donald R. Moore Gulf Coast Research Laboratory Follow this and additional works at: https://aquila.usm.edu/gcr Recommended Citation Moore, D. R. 1961. The Marine and Brackish Water Mollusca of the State of Mississippi. Gulf Research Reports 1 (1): 1-58. Retrieved from https://aquila.usm.edu/gcr/vol1/iss1/1 DOI: https://doi.org/10.18785/grr.0101.01 This Article is brought to you for free and open access by The Aquila Digital Community. It has been accepted for inclusion in Gulf and Caribbean Research by an authorized editor of The Aquila Digital Community. For more information, please contact [email protected]. Gulf Research Reports Volume 1, Number 1 Ocean Springs, Mississippi April, 1961 A JOURNAL DEVOTED PRIMARILY TO PUBLICATION OF THE DATA OF THE MARINE SCIENCES, CHIEFLY OF THE GULF OF MEXICO AND ADJACENT WATERS. GORDON GUNTER, Editor Published by the GULF COAST RESEARCH LABORATORY Ocean Springs, Mississippi SHAUGHNESSY PRINTING CO.. EILOXI, MISS. 0 U c x 41 f 4 21 3 a THE MARINE AND BRACKISH WATER MOLLUSCA of the STATE OF MISSISSIPPI Donald R. Moore GULF COAST RESEARCH LABORATORY and DEPARTMENT OF BIOLOGY, MISSISSIPPI SOUTHERN COLLEGE I -1- TABLE OF CONTENTS Introduction ............................................... Page 3 Historical Account ........................................ Page 3 Procedure of Work ....................................... Page 4 Description of the Mississippi Coast ....................... Page 5 The Physical Environment ................................ Page '7 List of Mississippi Marine and Brackish Water Mollusca . Page 11 Discussion of Species ...................................... Page 17 Supplementary Note .....................................
    [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]
  • Molluscs (Mollusca: Gastropoda, Bivalvia, Polyplacophora)
    Gulf of Mexico Science Volume 34 Article 4 Number 1 Number 1/2 (Combined Issue) 2018 Molluscs (Mollusca: Gastropoda, Bivalvia, Polyplacophora) of Laguna Madre, Tamaulipas, Mexico: Spatial and Temporal Distribution Martha Reguero Universidad Nacional Autónoma de México Andrea Raz-Guzmán Universidad Nacional Autónoma de México DOI: 10.18785/goms.3401.04 Follow this and additional works at: https://aquila.usm.edu/goms Recommended Citation Reguero, M. and A. Raz-Guzmán. 2018. Molluscs (Mollusca: Gastropoda, Bivalvia, Polyplacophora) of Laguna Madre, Tamaulipas, Mexico: Spatial and Temporal Distribution. Gulf of Mexico Science 34 (1). Retrieved from https://aquila.usm.edu/goms/vol34/iss1/4 This Article is brought to you for free and open access by The Aquila Digital Community. It has been accepted for inclusion in Gulf of Mexico Science by an authorized editor of The Aquila Digital Community. For more information, please contact [email protected]. Reguero and Raz-Guzmán: Molluscs (Mollusca: Gastropoda, Bivalvia, Polyplacophora) of Lagu Gulf of Mexico Science, 2018(1), pp. 32–55 Molluscs (Mollusca: Gastropoda, Bivalvia, Polyplacophora) of Laguna Madre, Tamaulipas, Mexico: Spatial and Temporal Distribution MARTHA REGUERO AND ANDREA RAZ-GUZMA´ N Molluscs were collected in Laguna Madre from seagrass beds, macroalgae, and bare substrates with a Renfro beam net and an otter trawl. The species list includes 96 species and 48 families. Six species are dominant (Bittiolum varium, Costoanachis semiplicata, Brachidontes exustus, Crassostrea virginica, Chione cancellata, and Mulinia lateralis) and 25 are commercially important (e.g., Strombus alatus, Busycoarctum coarctatum, Triplofusus giganteus, Anadara transversa, Noetia ponderosa, Brachidontes exustus, Crassostrea virginica, Argopecten irradians, Argopecten gibbus, Chione cancellata, Mercenaria campechiensis, and Rangia flexuosa).
    [Show full text]
  • Rangia Cuneata) Ecological Risk Screening Summary
    U.S. Fish and Wildlife Service Atlantic Rangia (Rangia cuneata) Ecological Risk Screening Summary Web Version – 10/1/2012 Photo: USGS 1 Native Range and Nonindigenous Occurrences Native Range Gulf of Mexico (Benson 2012) From GISD (2011): “Rangia cuneata is considered to be native to the Gulf of Mexico and introduced to the NW Atlantic, where it is predominantly found in estuaries. “ Nonindigenous Occurrences From Benson (2012): “East coast of Florida to the Chesapeake Bay; James River and Potomac River in Virginia, lower portion of the Hudson River in New York.” From GISD (2011): Rangia cuneata Ecological Risk Screening Summary U.S. Fish and Wildlife Service – Web Version – 10/01/2012 “Known introduced range: lower portion of the Hudson River, New York …” Means of Introductions From Benson (2012): “Not seen on the Atlantic coast before 1956. Could have been an accidental release with oyster mariculture or perhaps with intracoastal ballast water.” Corroborated by Carlton (1992): “Ballast water or the movement of commercial oysters may have transported the clam Rangia cuneata from the Gulf of Mexico to Chesapeake Bay, from where it may have spread down the coast to Florida, and from where it may have been carried in ballast water to the Hudson River.” Remarks There has been some confusion over whether or not R. cuneata is a native species on the east coast of the United States. The current thinking by Fofonoff et al. (2003) is described on the National Exotic Marine and Estuarine Species Information System (NEMESIS) web site managed by the Smithsonian Environmental Research Center (SERC): “Conrad (1840) described Rangia cuneata (Gulf Wedge Clam) as 'an inhabitant of the estuaries of the Gulf of Mexico and occurring in the upper Tertiary formation in the bank of the Potomac River in Maryland and on the Neuse River, North Carolina '.
    [Show full text]
  • Growth-Related Gene Expression in Haliotis Midae
    GROWTH‐RELATED GENE EXPRESSION IN HALIOTIS MIDAE Mathilde van der Merwe Dissertation presented for the degree of Doctor of Philosophy (Genetics) at Stellenbosch University Promoter: Dr Rouvay Roodt‐Wilding Co‐promoters: Dr Stéphanie Auzoux‐Bordenave and Dr Carola Niesler December 2010 Declaration By submitting this dissertation, I declare that the entirety of the work contained therein is my own, original work, that I am the authorship owner thereof (unless to the extent explicitly otherwise stated) and that I have not previously in its entirety or in part submitted it for obtaining any qualification. Date: 09/11/2010 Copyright © 2010 Stellenbosch University All rights reserved I Acknowledgements I would like to express my sincere gratitude and appreciation to the following persons for their contribution towards the successful completion of this study: Dr Rouvay Roodt‐Wilding for her continued encouragement, careful attention to detail and excellent facilitation throughout the past years; Dr Stéphanie Auzoux‐Bordenave for valuable lessons in abalone cell culture and suggestions during completion of the manuscript; Dr Carola Niesler for setting an example and providing guidance that already started preparing me for a PhD several years ago; Dr Paolo Franchini for his patience and greatly valued assistance with bioinformatics; Dr Aletta van der Merwe and my fellow lab‐colleagues for their technical and moral support; My dear husband Willem for his love, support and enthusiasm, for sitting with me during late nights in the lab and for making me hundreds of cups of tea; My parents for their love and encouragement and for instilling the determination in me to complete my studies; All my family and friends for their sincere interest.
    [Show full text]
  • Shortnose Sturgeon Fact Sheet
    Shortnose Sturgeon Acipenser brevirostrum Description: Facts: olive-yellow to gray or bluish on the back listed as endangered, it is unlawful to kill or possess this fish milky white to dark yellow on the belly long lived, like most sturgeon 5 rows of pale bony plates, called scutes males spawn every other year, females spawn every (one on the back, two on the belly and one on each third year side) semi anadromous (migrates from salt water to spawn scutes are pale and contrast with background in fresh water) 4 barbels in front of its large underslung mouth eat sludge worms, insect larvae, plants, snails, shrimp and crayfish short blunt conical snout use barbels to locate food Size: rarely exceeds 3.5 feet and 14 pounds SHORTNOSE STURGEON CATCH TOTALS Year Total 2004 1 Range: Grand Total 1 Atlantic seaboard in North America, from the St. *shortnose sturgeon were only caught during the John’s River in New Brunswick to the St. John River years shown in Florida NJ Department of Environmental Protection Division of Fish and Wildlife Bureau of Marine Fisheries www.NJFishandWildlife.com Shortnose Sturgeon Acipenser brevirostrum Historically, the Delaware Estuary has been an important habitat for two species of sturgeon: the shortnose sturgeon, and its cousin, the Atlantic sturgeon. Atlantic sturgeon primarily live in the ocean, and migrate through the estuary to spawn in freshwater. Shortnose sturgeon spend most of their time in the brackish water of the estuary, moving upstream to fresher water to spawn. Over the duration of the Delaware River seine survey, only one sturgeon has ever been caught.
    [Show full text]