DOCSLIB.ORG

Mollusca, Gastropoda) Brazil

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Mollusca, Gastropoda) Brazil October 2003 CainozoicResearch, 2(l-2)(2002), pp. 117-128, Neritidae (Mollusca, Gastropoda) from the Miocene of western Amazonia (Peru, Colombia and Brazil) Frank+P. Wesselingh NationaalNatuurhistorisch Museum (Naturalis), P.O. Box 951 7, NL-2300 RA Leiden, the Netherlands; e-mail: [email protected]; and, University of Turku Biodiversity Centre, Faculty ofBiology, University of Turku, SF-200I4 Turku. Finland Received 25 January2003, revised version accepted 24 March 2003 Six neritid species are recorded from the Miocene (PebasFormation) of western Amazonia (Peru, Colombiaand Brazil), two of which, The Neritina (?) patricknuttalli and N. (?) elephantina, are described as new. subgeneric status of Pebasianneritids remains unresolved. Palaeoecological and palaeobiogeographicalimplications are briefly discussed. KEY WORDS:: South America, Amazonia, Miocene, Neritidae, Neritina, new species. Introduction examine relationships with other Recent and fossil neo- tropical neritids, and to discuss palaeoecological and In the well-preserved Miocene molluscan faunas of the palaeobiogeographic implications. Because of the uncertain Pebas Formation in western Amazonia, specimens of subgeneric status of the six species of Neritina known to Neritina are common. In his seminal review of South date from the Pebas Formation and of its close relatives American non-marine molluscan Nuttall the informal ‘Pebasian is used faunas, (1990) (see below), name Neritina’ considered all Miocene species ofNeritina from the west- here to characterise this group. ern Amazonia to be conspecific and he used the name ?N. ortoni Conrad, 1871 for them. With the exception of a single neritid from the Cantaure Formation (Miocene) of Systematic palaeontology northernVenezuela, Nuttall was unableto link the Pebasian fossil The Pebasian Abbreviations — denote the of material neritids to any other or extant taxa. To repositories neritids are characterised by their commonly velatiform referred to in the text, the following abbreviations are used: outline (i.e., expanded inner lip callus, basal portion of shell’s body whorl in a plane strongly inclined to the axis, and flaring outer lip) and by the absence of an opercular BMNH The Natural History Museum, London (formerly peg. The latter feature is shared with extant N. (Fluvinerita) British Museum [Natural History]); tenebricosa (Adams, 1851) from Jamaica, but Nuttall CAS CaliforniaAcademy ofSciences, San Francisco; (1990) found that species to differ from the Pebasian GG collections of the Department of Palaeontology neritids by its thick, spirally striated, non-velatiform shell, (BMNH; see Nuttall, 1990); and dismissed it as a possible close relative of Pebasian 1NGEMMET Geological Survey, San Borja, Lima; Neritina. A study of newly collected material from the NYSM New York State Museum, Syracuse; Pebas Formation, and a re-examinationof museum speci- PIMUZ Palaontologisches Institut und Museum der from ofnorthwest South America Universitat mens Neogene deposits Zurich; have now shown Pebasian Neritina to comprise several RGM Nationaal Natuurhistorisch Museum, Leiden species. These species are most easily, but not exclusively, (formerly Rijksmuseum van Geologic en Miner- distinguished by their colourpatterns, although this feature alogie), Department of Palaeontology, Division is notorious for its intraspecific variation (see e.g., Will- ofCainozoic Mollusca for for Nationaal Natuurhistorisch mann, 1981 Theodoxus; Costa et al., 2001 RMNH Museum, Leiden Neritina). (formerly Rijksmuseum voor Natuurlijke Histo- the to for of The aim of present paper is provide diagnoses ric), Department Evertebrates, Malacology differentiationof Miocenewestern Amazonian neritids, to Division. - 118 - Stratigraphic age estimates are adapted from Hoorn (1993); having smaller, higher-spired shells, with more whorls, a data are listed in 1, while the material in dental architecture and of locality Appendix non-flaring outer lip, presence studied, with the exception of type specimens, is listed in a dark colour band subsuturally on most specimens. Nuttall 2. Appendix (1990) discussed and rejected a close relationship between Pebasian Neritina and extant Neritina zebra (Bruguiere, 1792). Neritilia succinea (Recluz, 1841 (extant, Greater Superfamily Neritoidea Lamarck, 1809 Antilles and central America) has a ‘subpatelliform’ outline Neritidae 1809 Family Lamarck, (Russell, 1941, p. 398) in common with the Pebasian Genus Neritina Lamarck, 1816 of it is small width species Neritina. However, very (shell < 6 mm) and the colour is deeply impregnated into the The Pebasian neritids characterised velatiform are by a shell, while in the Pebasian species colours form part ofthe shell form and the absence ofan opercular peg. Using these outer shell layers only, and easily come off. The Pebasian features, the following neotropical species are attributedto neritids differ from other extant neotropical neritids in the ‘Pebasian Neritina group’: having a low spire (see e.g., Russell, 1941). The range of morphological variation resembles that of the Eurasian * Miocene, western Amazonia: genus Theodoxus de Montfort, 1810. It is only by virtue of Neritina(?) ortoni Conrad, 1871, A. (?)puncta Etheridge, the disjunct temporal and geographic distribution, as well 1879 N. (?) etheridgei Roxo, 1924, N. (?) roxoi de Greve, as the tropical distribution of the Pebasian species of N. and N. distributionof Theo- 1938, (?)patricknuttalli n. sp., (?) elephantina n. Neritina, vs a temperate-subtropical sp. doxus, that these two taxa are treated as distinct forthe time being. There is no living species of the ‘Pebasian Neritina * Miocene, northern Venezuela: group’ to test this. The shelloutline ofseveral of the Peba- N. aff. woodwardiGuppy, 1866 sian neritids superficially resembles that of the Caribbean Neritinapunctulata Lamarck, 1816 (Figure 21). However, * Ecuador: the of close Miocene, presence an opercular peg argues against a N. pacchiana Palmer in Liddle & Palmer, 1941 relationship between these two. Isolated opercula (see Nuttall, 1990, fig. 26a, b) are Three other dominicana species, Neritina Costa et al, common in the Pebas Formation, but they cannot be attrib- 2001 and N.jungi Costa etai, 2001 (Miocene, Dominican uted to any particular species with certainty. All of these Republic) and#, sp. Woodring, 1973 (Eocene, Panama) opercula, however, lack a peg, and it is therefore safe to the ‘Pebasian with that do indeed are assigned to Neritina group’ some assume they belong to the Pebasian species hesitation (see Discussion). documentedbelow. Initially, I placed Pebasian species ofNeritina illthe sub- — Small to width low- Diagnosis large (shell 4-22 mm), genus Fluvinerita Pilsbry, 1932 (extant, freshwater, Ja- ovate to spired, globose, commonly shouldered neritid; maica), on the basis of the absence of an opercular peg. low-spired (velatiform) species commonly involute, with a However, a recent discussion with H.K. Mienis (Hebrew hooked suture viewed from above; ovate species with University, Tel Aviv) has convinced me that several other nucleus and characters prominent erect a suture describing a spiral displayed by the Jamaicantaxon (<e.g., absence when viewed from subsutural of denticles columellar above; ramp convex to (more on lip, a comparatively poorly commonly) concave; growth lines strongly prosocline; developed inner lip callus, a higher spire and a rather shells with a wide range of colour patterns, including efface convex whorl profile) are incompatible with the Pebasian white and colour and the to zigzag punctate; patterns superficial; neritids, previous subgeneric assignment was diffuse spiral striae visible on abraded (portions of) speci- abandoned. subdued and/oraxial ribs but characteris- mens; spiral rare, tic of a single species; very fine, minute, slightly irregular spiral cords on very well-preserved specimens of most Neritina (?) ortoni Conrad, 1871 inner species; a flaring outer lip on most larger species; lip Figures 1-7 callus well developed to prominent, often thickened; callus in the entire basal - expanding some species over shell; 1869 Neritina pupa (Linne) Gabb, p. 197, pi. 16, fig. 2. * 1871 Neritina ortoni operculum lacking peg. Conrad, p. 195, pi. 10, figs 5,11. 1871 Neritina - ortoni Conrad Woodward, p. 103, pi. 5, fig. 2a, b. — of the have Differentiation Species genus Puperita 1878 Neritina - ortoni Conrad Boettger, p. 428. obscure spiral ribs (Costa et al., 2001), but are compara- 1938 Neritina (Vitta) amazonensis de Greve, p. 62, pi. 5, figs tively high-spired and lack the prominent columellar area 4-6, 8. of the of Neritina discussed herein. The typical species (?) 1938 Neritina Roxo - (Vitta) etheridgei de Greve, p. 66, pi. 5, of Neritina 1917 group fulgopicta Maury, (Miocene, figs 1-3, 7, 9. Dominican and N. 1966 ?Neritina de Greve — Republic) virginea (Linne, 1758) (ex- amazonensis Willard,p. 66, pi. 62, tant, Caribbean) differs from the Pebasian neritids in fig. 3. - 119- All specimens illustrated, with the exception of Figure 21, are from the Miocene Pebas Formation; for locality data see Appendix 1 Neritina (?) ortoni Conrad, 1871 - 1 lectotype, NYSM 9277 (J. Hauxwell Colin), ‘Pichua’ (probably Santa Rosa de Pichana), Loreto department, Peru; 2 - paralectotype, NYSM 9276, same locality; 3 - ROM 456 092, Santa Rosa de Pichana, Loreto department, Peru; 4 - RGM 456 100, Santa Elena III, Loreto department, Peru (collected from surface); 5 - RGM 456 134, C14 Hoom Colin, Santa Julia, Loreto department,Peru; - 6
Load more

Recommended publications
  • 2347-503X Assessment of Coastal Pollution Using Faunal Composit
    Research Chronicler, International Multidisciplinary Refereed Peer Reviewed Indexed Research Journal ISSN: Print: 2347-5021 www.research-chronicler.com ISSN: Online: 2347-503X Assessment of Coastal Pollution Using Faunal Composition of Macrobenthos from Panvel Creek, Navi Mumbai, West Coast of India Prabhakar Ramchandra Pawar,1 Leena N. Meshram,2 Sunil M. Udawant,3 Rauphunnisa F. Inamdar4 1,2,3Mahatma Phule Arts, Science & Commerce College, Panvel, Dist. – Raigad, Navi Mumbai, (M.S.) India 4Veer Wajekar Arts, Science & Commerce College, Phunde, Uran, Dist. – Raigad, Navi Mumbai, (M.S.) India Abstract Diversity of macrobenthos from Panvel creek remain poorly known. Here, the species composition and abundance of macrobenthos is explored from June 2018 to May 2019 to assess the ecological status of the creek. 18 species of macrobenthic fauna consisting of 14 genera, 12 families, 06 orders and 05 classes were recorded. The most abundant taxa were polychaetes, crustaceans, gastropods and pelecypods. Species belonging to Polynoidae, Cerithiidae, Potamididae, Neritidae and Trapezidae shows highest distribution and abundance. The creek is dominated by Perinereis cultrifera, Clypeomorus bifasciata, Potamides cingulatus, Nerita oryzarum and Neotrapezium sublaevigatum. N. sublaevigatum of the family Trapezidae from the class Bivalvia is recorded as an opportunistic taxa which exploits disturbed condition due to environmental stress. This study showed that at present though the creek is resourceful and supports the coastal marine life, is under considerable stress of anthropogenic inputs. Coastal environment of Panvel creek is deteriorating due to ongoing construction of Navi Mumbai International Airport and unplanned development activities. Present information could be helpful as a baseline data for further study of anthropogenic inputs on coastal ecosystem of Panvel creek.
    [Show full text]
  • Observations on Neritina Turrita (Gmelin 1791) Breeding Behaviour in Laboratory Conditions
    Hristov, K.K. AvailableInd. J. Pure online App. Biosci. at www.ijpab.com (2020) 8(5), 1-10 ISSN: 2582 – 2845 DOI: http://dx.doi.org/10.18782/2582-2845.8319 ISSN: 2582 – 2845 Ind. J. Pure App. Biosci. (2020) 8(5), 1-10 Research Article Peer-Reviewed, Refereed, Open Access Journal Observations on Neritina turrita (Gmelin 1791) Breeding Behaviour in Laboratory Conditions Kroum K. Hristov* Department of Chemistry and Biochemistry, Medical University - Sofia, Sofia - 1431, Bulgaria *Corresponding Author E-mail: [email protected] Received: 15.08.2020 | Revised: 22.09.2020 | Accepted: 24.09.2020 ABSTRACT Neritina turrita (Gmelin 1791) along with other Neritina, Clithon, Septaria, and other fresh- water snails are popular animals in ornamental aquarium trade. The need for laboratory-bred animals, eliminating the potential biohazard risks, for the ornamental aquarium trade and the growing demand for animal model systems for biomedical research reasons the work for optimising a successful breading protocol. The initial results demonstrate N. turrita as tough animals, surviving fluctuations in pH from 5 to 9, and shifts from a fresh-water environment to brackish (2 - 20 ppt), to sea-water (35 ppt) salinities. The females laid over 630 (at salinities 0, 2, 10 ppt and temperatures of 25 - 28oC) white oval 1 by 0.5 mm egg capsules continuously within 2 months after collecting semen from several males. Depositions of egg capsules are set apart 6 +/-3 days, and consist on average of 53 (range 3 to 192) egg capsules. Production of viable veligers was recorded under laboratory conditions. Keywords: Neritina turrita, Sea-water, Temperatures, Environment INTRODUCTION supposably different genera forming hybrids Neritininae are found in the coastal swamps of with each other, suggesting their close relation.
    [Show full text]
  • MOLECULAR PHYLOGENY of the NERITIDAE (GASTROPODA: NERITIMORPHA) BASED on the MITOCHONDRIAL GENES CYTOCHROME OXIDASE I (COI) and 16S Rrna
    ACTA BIOLÓGICA COLOMBIANA Artículo de investigación MOLECULAR PHYLOGENY OF THE NERITIDAE (GASTROPODA: NERITIMORPHA) BASED ON THE MITOCHONDRIAL GENES CYTOCHROME OXIDASE I (COI) AND 16S rRNA Filogenia molecular de la familia Neritidae (Gastropoda: Neritimorpha) con base en los genes mitocondriales citocromo oxidasa I (COI) y 16S rRNA JULIAN QUINTERO-GALVIS 1, Biólogo; LYDA RAQUEL CASTRO 1,2 , Ph. D. 1 Grupo de Investigación en Evolución, Sistemática y Ecología Molecular. INTROPIC. Universidad del Magdalena. Carrera 32# 22 - 08. Santa Marta, Colombia. [email protected]. 2 Programa Biología. Universidad del Magdalena. Laboratorio 2. Carrera 32 # 22 - 08. Sector San Pedro Alejandrino. Santa Marta, Colombia. Tel.: (57 5) 430 12 92, ext. 273. [email protected]. Corresponding author: [email protected]. Presentado el 15 de abril de 2013, aceptado el 18 de junio de 2013, correcciones el 26 de junio de 2013. ABSTRACT The family Neritidae has representatives in tropical and subtropical regions that occur in a variety of environments, and its known fossil record dates back to the late Cretaceous. However there have been few studies of molecular phylogeny in this family. We performed a phylogenetic reconstruction of the family Neritidae using the COI (722 bp) and the 16S rRNA (559 bp) regions of the mitochondrial genome. Neighbor-joining, maximum parsimony and Bayesian inference were performed. The best phylogenetic reconstruction was obtained using the COI region, and we consider it an appropriate marker for phylogenetic studies within the group. Consensus analysis (COI +16S rRNA) generally obtained the same tree topologies and confirmed that the genus Nerita is monophyletic. The consensus analysis using parsimony recovered a monophyletic group consisting of the genera Neritina , Septaria , Theodoxus , Puperita , and Clithon , while in the Bayesian analyses Theodoxus is separated from the other genera.
    [Show full text]
  • Variación Fenotípica De La Concha En Neritinidae (Gastropoda: Neritimorpha) En Ríos De Puerto Rico
    Variación fenotípica de la concha en Neritinidae (Gastropoda: Neritimorpha) en ríos de Puerto Rico Juan Felipe Blanco1, Silvana Tamayo1 & Frederick N. Scatena2,3 1. Instituto de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Calle 67 # 53-108, Medellín, Colombia. Apartado Aéreo 1226; [email protected]; [email protected] 2. Departamento de Ciencias de la Tierra y Ambientales, Universidad de Pensilvania, Filadelfia, Estados Unidos. 3. Fallecido Recibido 12-XII-2013. Corregido 20-I-2014. Aceptado 13-II-2014. Abstract: Phenotypic variability of the shell in Neritinidae (Gastropoda: Neritimorpha) in Puerto Rican rivers. Gastropods of the Neritinidae family exhibit an amphidromous life cycle and an impressive variability in shell coloration in Puerto Rican streams and rivers. Various nominal species have been described, but Neritina virginea [Linné 1758], N. punctulata [Lamarck 1816] and N. reclivata [Say 1822] are the only broadly reported. However, recent studies have shown that these three species are sympatric at the river scale and that species determination might be difficult due to the presence of intermediate color morphs. Individuals (8 751) were collected from ten rivers across Puerto Rico, and from various segments and habitats in Mameyes River (the most pristine island-wide) during three years (2000-2003), and they were assigned to one of seven phenotypes corresponding to nominal species and morphs (non-nominal species). The “axial lines and dots” morph cor- responding to N. reclivata was the most frequent island-wide, while the patelliform N. punctulata was scant, but the only found in headwater reaches. The “yellowish large tongues” phenotype, typical of N.
    [Show full text]
  • The Aquatic Exodus: an Overview of Migratory Species in Jamaican Freshwater Systems
    The Aquatic Exodus: An Overview of Migratory Species in Jamaican Freshwater Systems Prepared by Ms. Kimberly John Freshwater Conservation Specialist The Nature Conservancy & Ms. Aisha Bailey Volunteer - Freshwater Conservation The Nature Conservancy Introduction Two mass migration events were recently reported in the Jamaican media (Daily Observer, January 9 th , 2006 and Jamaica Gleaner November 25 th , 2005). Both involved the natural migration of freshwater species from the sea to upstream areas in rivers. Active migrations within river systems are not usually noticed or recorded by scientists and locals in Jamaica (although they used to be a regular part of our rural culture). Consequently, the migrations of freshwater gobies between November 2005 and January 2006 sparked some temporary curiosity in the Jamaican public. What was not publicly emphasised at the time was that these were not rare, unnatural or ominous events. On the contrary the migration of many of Jamaica’s freshwater species from upstream areas to the sea and vice versa is a regular natural occurrence and an important facet of healthy, functional, aquatic ecosystems. This article aims to provide general ecological information on migration in Jamaica’s rivers -a virtual aquatic exodus- repeated over millennia across the island. This overview will hopefully provide scientists and non-scientists alike with some insight into this fascinating aspect of Jamaica’s natural history and set us thinking more critically about how our activities impact freshwater ecosystems. Figure 1: Front page of the Daily Observer, January 9th, 2005 - Spectators watch the upstream migration of thousands of juvenile gobies ( Sicidium Plumieri ) at the Yallahs fording.
    [Show full text]
  • De La Génétique Des Populations À L'écologie Des Communautés
    - Université Montpellier 2 - SCIENCES ET TECHNIQUES DU LANGUEDOC T H È S E En vue d’obtenir le grade de DOCTEUR DE L'UNIVERSITE MONTPELLIER 2 Discipline : Evolution, Ecologie, Ressources Génétiques, Paléontologie École Doctorale : Systèmes Intégrés en Biologie, Agronomie, Géosciences, Hydrosciences et Environnement Présentée et soutenue publiquement le 7 décembre 2011 par Thomas LAMY De la génétique des populations à l’écologie des communautés : le cas des mollusques d’eau douce aux Antilles françaises JURY Olivier HARDY Chercheur, Université Libre de Bruxelles, Belgique Rapporteur Jérôme CHAVE Directeur de recherche, CNRS, Toulouse Rapporteur Isabelle OLIVIERI Professeur, Université Montpellier II, Montpellier Examinateur Patrice DAVID Directeur de recherche, CNRS, Montpellier Directeur de thèse Philippe JARNE Directeur de recherche, CNRS, Montpellier Membre invité Remerciements Je souhaiterais commencer cette partie en remerciant chaleureusement mes deux directeurs de thèse. Philippe, tu es le premier à m’avoir motivé à venir en thèse à Montpellier, et franchement ça en valait le coup ! Je sais qu’il n’est pas facile d’assurer à la fois le rôle de directeur de labo et celui de directeur de thèse. Pourtant tu as toujours été disponible et présent pour discuter, notamment lors de la dernière ligne droite. Bravo pour ton organisation irréprochable et ce fut un réel plaisir de travailler avec toi. Je regrette toutefois une chose : ne avoir connu les joies du terrain avec toi, car moi aussi, je voudrais prétexter de partir échantillonner des mélanos pour en fait boire des bières ! Je me souviens encore d’une des premières discussions que j’ai eues avec toi : tu soutenais que les questions scientifiques sont bien plus importantes que le choix du système d’étude.
    [Show full text]
  • Introduction to Mollusca and the Class Gastropoda
    Author's personal copy Chapter 18 Introduction to Mollusca and the Class Gastropoda Mark Pyron Department of Biology, Ball State University, Muncie, IN, USA Kenneth M. Brown Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA Chapter Outline Introduction to Freshwater Members of the Phylum Snail Diets 399 Mollusca 383 Effects of Snail Feeding 401 Diversity 383 Dispersal 402 General Systematics and Phylogenetic Relationships Population Regulation 402 of Mollusca 384 Food Quality 402 Mollusc Anatomy and Physiology 384 Parasitism 402 Shell Morphology 384 Production Ecology 403 General Soft Anatomy 385 Ecological Determinants of Distribution and Digestive System 386 Assemblage Structure 404 Respiratory and Circulatory Systems 387 Watershed Connections and Chemical Composition 404 Excretory and Neural Systems 387 Biogeographic Factors 404 Environmental Physiology 388 Flow and Hydroperiod 405 Reproductive System and Larval Development 388 Predation 405 Freshwater Members of the Class Gastropoda 388 Competition 405 General Systematics and Phylogenetic Relationships 389 Snail Response to Predators 405 Recent Systematic Studies 391 Flexibility in Shell Architecture 408 Evolutionary Pathways 392 Conservation Ecology 408 Distribution and Diversity 392 Ecology of Pleuroceridae 409 Caenogastropods 393 Ecology of Hydrobiidae 410 Pulmonates 396 Conservation and Propagation 410 Reproduction and Life History 397 Invasive Species 411 Caenogastropoda 398 Collecting, Culturing, and Specimen Preparation 412 Pulmonata 398 Collecting 412 General Ecology and Behavior 399 Culturing 413 Habitat and Food Selection and Effects on Producers 399 Specimen Preparation and Identification 413 Habitat Choice 399 References 413 INTRODUCTION TO FRESHWATER shell. The phylum Mollusca has about 100,000 described MEMBERS OF THE PHYLUM MOLLUSCA species and potentially 100,000 species yet to be described (Strong et al., 2008).
    [Show full text]
  • THE SPATIAL ARRANGEMENT of NERITINA VIRGINEA (GASTROPODA: NERITIDAE) DURING UPSTREAM MIGRATION in a SPLIT-CHANNEL Reachy
    RIVER RESEARCH AND APPLICATIONS River Res. Applic. 23: 235–245 (2007) Published online in Wiley InterScience (www.interscience.wiley.com) DOI: 10.1002/rra.974 THE SPATIAL ARRANGEMENT OF NERITINA VIRGINEA (GASTROPODA: NERITIDAE) DURING UPSTREAM MIGRATION IN A SPLIT-CHANNEL REACHy JUAN F. BLANCOa,b* and FREDERICK N. SCATENAb,c a Department of Biology, University of Puerto Rico, Rio Piedras, San Juan, PR 00931-3360, USA b International Institute of Tropical Forestry, USDA Forest Service, San Juan, PR 00926-1119, USA c Department of Earth and Environmental Sciences, University of Pennsylvania, Philadelphia, PA 19104-6313, USA ABSTRACT This paper relates differences in flow hydraulics between a main channel (MC) and a side channel (SC) of a river to patterns of upstream migration by Neritina virginea (Neritidae: Gastropoda), a dominant diadromous snail in streams of Puerto Rico (Greater Antilles). Near-bed water velocity, snail density and shell size were measured on a weekly basis between August and December 2000 along cross-sections in a main channel (MC) and an adjacent channel (SC) under a bridge crossing of the Rı´o Mameyes of Northeastern Puerto Rico. Near-bed velocity and water depth were used to compute Reynolds (Re) and Froude (Fr) numbers, and to classify flows within each channel. During base flow conditions (<2m3 sÀ1), flow was chaotic and supercritical (Fr > 1) in the MC, and non-chaotic and subcritical (Fr < 1) in the SC. Higher mean densities (>100 ind mÀ2) of relatively small snails (mean Æ s.d., 6.3 Æ 2.8 mm) were consistently recorded in the MC. Conversely, the SC had lower mean densities (<20 ind mÀ2) and significantly larger snails (7.6 Æ 2.4 mm).
    [Show full text]
  • Researchspace
    Villeneuve, A.R., Thornhill, I. and Eales, J. (2019) 'Upstream migration and altitudinal distribution patterns of 'Nereina punctulata' (Gastropoda: Neritidae) in Dominica, West Indies’, Aquatic Ecology. doi: 10.1007/s10452-019-09683-7. This is a post-peer-review, pre-copyedit version of an article published in ‘Aquatic Ecology’. The final authenticated version is available online at: https://doi.org/10.1007/s10452-019-09683-7 ResearchSPAce http://researchspace.bathspa.ac.uk/ This pre-published version is made available in accordance with publisher policies. Please cite only the published version using the reference above. Your access and use of this document is based on your acceptance of the ResearchSPAce Metadata and Data Policies, as well as applicable law:- https://researchspace.bathspa.ac.uk/policies.html Unless you accept the terms of these Policies in full, you do not have permission to download this document. This cover sheet may not be removed from the document. Please scroll down to view the document. Upstream migration and altitudinal distribution patterns of Nereina punctulata (Gastropoda: Neritidae) in Dominica, West Indies Andrew Robert Villeneuve1,4, Ian Thornhill1,2, and Jacqualyn Eales1,3 1Operation Wallacea, Wallace House, Old Bolingbroke, Spilsby, Lincolnshire PE23 4EX, UK 2College of Liberal Arts (CoLA), Bath Spa University, Newton St. Loe, Bath, BA2 9BN, UK 3European Centre for Environment and Human Health, University of Exeter Medical School, Knowledge Spa, Royal Cornwall Hospital, Truro, Cornwall, TR1 3HD, UK 4Corresponding author, [email protected] ORCID: https://orcid.org/0000-0001-7303-5931 Researchgate: https://www.researchgate.net/profile/Andrew_Villeneuve Acknowledgements The authors thank volunteers and research staff with Operation Wallacea (http://www.opwall.com/) who greatly assisted in data collection.
    [Show full text]
  • 387 Freshwater Neritids (Mollusca: Gastropoda) Of
    Revue d’Ecologie (Terre et Vie), Vol. 70 (4), 2015 : 387-397 FRESHWATER NERITIDS (MOLLUSCA: GASTROPODA) OF TROPICAL ISLANDS: AMPHIDROMY AS A LIFE CYCLE, A REVIEW 1,2 1 2 Ahmed ABDOU , Philippe KEITH & René GALZIN 1 Sorbonne Universités - Muséum national d’Histoire naturelle, UMR BOREA MNHN – CNRS 7208 – IRD 207 – UPMC – UCBN, 57 rue Cuvier CP26, 75005 Paris, France. E-mails: [email protected] ; [email protected] 2 Laboratoire d'excellence Corail, USR 3278 CNRS-EPHE-UPVD, Centre de Recherches Insulaires et Observatoire de l'Environnement (CRIOBE), BP 1013 Papetoai - 98729 Moorea, French Polynésia. E-mail: [email protected] RÉSUMÉ.— L’amphidromie en tant que cycle de vie des Néritidés (Mollusca : Gastropoda) des eaux douces dans les îles tropicales, une revue.— Les eaux douces des îles tropicales abritent des mollusques de la famille des Neritidae, ayant un cycle de vie spécifique adapté à l’environnement insulaire. Les adultes se développent, se nourrissent et se reproduisent dans les rivières. Après l’éclosion, les larves dévalent vers la mer où elles passent un laps de temps variable selon les espèces. Ce cycle de vie est appelé amphidromie. Bien que cette famille soit la plus diversifiée des mollusques d’eau douce, le cycle biologique, les paramètres et les processus évolutifs qui conduisent à une telle diversité sont peu connus. Cet article fait le point sur l’état actuel des connaissances sur la reproduction, le recrutement, la migration vers l’amont et la dispersion. Les stratégies de gestion et de restauration pour la préservation des nérites amphidromes exigent de développer la recherche pour avoir une meilleure compréhension de leur cycle de vie.
    [Show full text]
  • Migration Patterns, Densities, and Growth of Neritina Punctulata Snails in Rio Espiritu Santo and Rio Mameyes, Northeastern Puerto Rico
    Caribbean Journal of Science, Vol. 39, No. 3, 338-347, 2003 Copyright 2003 College of Arts and Sciences University of Puerto Rico, Mayagu¨ez Migration Patterns, Densities, and Growth of Neritina punctulata Snails in Rio Espiritu Santo and Rio Mameyes, Northeastern Puerto Rico MARK PYRON1 AND ALAN P. COVICH2 1Department of Biology, Ball State University, Muncie, IN 47306, USA 2Department of Fishery and Wildlife Biology, Colorado State University, Fort Collins, CO 80523 USA Email address for corresponding author: [email protected] ABSTRACT.—Snail size-frequency distributions in Rios Espiritu Santo and Mameyes, which drain the Luquillo Experimental Forest, Puerto Rico, showed that Neritina punctulata with shell lengths greater than 30 mm were the most abundant size class at upstream sites. The highest densities for all size classes were at the downstream sites. Growth rates were 0.015 mm/day for a large cohort (∼25 mm shell length) and 0.035 mm/day for a small (∼15 mm shell length). Minimum longevity estimates range from 3 to 7 years. Size distribution data suggest that snails migrate upstream. An August mark-recapture study resulted in most snails remaining at the release site, and some moved downstream. The greatest upstream distance reached was 200 m in 12 weeks. In a May mark-recapture study, when snails were observed moving in aggregations, the greatest distance moved was 200 m in 27 days, suggesting seasonality in movements and reproduction. Movement rates of snails in aggregates in May were between 0.08 and 0.17 cm/s. All of the snails marked in May moved upstream, and none were observed downstream from, or at the release site.
    [Show full text]
  • Notes on the Stream Neritids ( Gastropoda; Prosobranchia) of Oceania
    NOTES ON THE STREAM NERITIDS ( GASTROPODA; PROSOBRANCHIA) OF OCEANIA ALISON HAYNES School of Pure and Applied Sciences University of the South Pacific, P.O. Box 1168 Suva, Fiji Abstract-Five stream neritid genera Clithon, Neritilia, Neritodryas and Septaria inhabit Oceania. The simplest way to separate the genera is to examine the shape of their opercula. Variations in the shape, colour and markings of the shell tend to make identification of the species difficult. At least 33 species of freshwater neritids are found throughout Oceania. Apart from the four endemic spe­ cies from the Hawaiian islands, the species that inhabit Oceania are also found in South East Asia and New Guinea. Fifteen species have so far been reported from North Pacific islands and twenty nine species from South Pacific islands. Introduction The two most important prosobranch gastropod families that inhabit the rivers and streams of the Pacific islands are the Thiaridae and the Neritidae. In general the Thiaridae have long turret-shaped shells while the Neritidae have streamlined shells with a large body whorl. The Neritidae are usually found in fast flowing streams although a few spe­ cies inhabit the tidal regions at the mouth of rivers. Gastropods were collected from the streams of most Pacific island groups during the nineteenth century. These were described by Lamarck (1815/22), Reeve (1856), Mousson (1869, 1870) and Gassies (1863). More recent surveys of freshwater gastropods have been made on Guam (Raulerson, 1979), Palau (Bright & June, 1979), Hawaii (Maciolek, 1975), New Caledonia (Franc, 1956; Starmiihlner, 1976), Guadalcanal (Solomon Is.), Efate (Vanuatu), Tahiti (Starmiihlner, 1976) and Viti Levu (Fiji) (Starmiihlner, 1976; Haynes, 1985).
    [Show full text]