DOCSLIB.ORG

Thomas Vanagt

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Thomas Vanagt FACULTEIT WETENSCHAPPEN The role of swash in the ecology of Ecuadorian sandy beach macrofauna, with special reference to the surfing gastropod Olivella semistriata De rol van swash in de ecologie van macrofauna op Ecuadoriaanse zandstranden, met speciale aandacht voor de surfende gastropode Olivella semistriata Thomas Vanagt Promotor: Prof. Dr. Magda Vincx Co-promotor: Dr. Steven Degraer Academic year 2006 – 2007 Thesis submitted in partial fulfillment of the requirements for the degree of Doctor in Science (Biology) Members of the reading committee Prof. Dr. Magda Vincx, promotor (UGent, Belgium) Dr. Steven Degraer, co-promotor (UGent, Belgium) Prof. Dr. Mariano Lastra (University of Vigo, Spain) Prof. Dr. Jean-Pierre Maelfait (UGent, Belgium) Members of the examination committee Prof. Dr. Wim Vyverman, Chairman (UGent, Belgium) Prof. Dr. Magda Vincx, promotor (UGent, Belgium) Dr. Steven Degraer, co-promotor (UGent, Belgium) Prof. Dr. Mariano Lastra (University of Vigo, Spain) Prof. Dr. Jean-Pierre Maelfait (UGent, Belgium) Dr. Dries Bonte (UGent, Belgium) Prof. Dr. Maria Pilar Cornejo (ESPOL, Ecuador) Dr. Nancy Fockedey (VLIZ, Belgium) Prof. Dr. Ann Vanreusel (UGent, Belgium) ‘Treat the Earth well: it was not given to you by your parents, it was loaned to you by your children. We do not inherit the Earth from our ancestors, we borrow it from our children’ Native-American saying TABLE OF CONTENTS Dankwoord Samenvatting I Summary VII Resumen XII PART I INTRODUCTION AND AIMS 1 1.1 Introduction 3 1.1.1 Sandy beaches 3 1.1.2 Macrofauna 12 1.1.3 Survival strategies of macrofauna on sandy beaches 20 1.1.4 The sandy beach gastropod Olivella semistriata 25 1.1.5 Framework of this thesis 27 1.2 Aims and thesis outline 28 MACROFAUNA ON ECUADORIAN SANDY BEACHES: THE ROLE OF SWASH PART II 31 AND MORPHODYNAMICS Changes in macrofaunal assemblage structure Chapter 1 along a morphodynamic sandy beach gradient 33 in the eastern tropical Pacific Abstract 34 2.1.1 Introduction 35 2.1.2 Materials and Methods 37 2.1.3 Results 43 2.1.4 Discussion 63 2.1.5 Conclusions 72 Swash zonation patterns of two surfers on exposed tropical Chapter 2 73 sandy beaches Abstract 74 2.2.1 Introduction 75 2.2.2 Materials and Methods 77 2.2.3 Results 82 2.2.4 Discussion 88 2.2.5 Conclusions 94 Size distribution of the surfing gastropod Olivella semistriata Chapter 3 95 along a cross-shore gradient in an Ecuadorian sandy beach Abstract 96 2.3.1 Introduction 97 2.3.2 Material and Methods 98 2.3.3 Results 101 2.3.4 Discussion 108 2.3.5 Conclusions 112 TABLE OF CONTENTS SOME ASPECTS OF THE BIOLOGY OF THE GASTROPOD OLIVELLA PART III 113 SEMISTRIATA Is the burrowing performance of a sandy beach surfing Chapter 4 115 gastropod limiting for its macroscale distribution? Abstract 116 3.4.1 Introduction 117 3.4.2 Material and Methods 118 3.4.3 Results 121 3.4.4 Discussion 129 3.4.5 Conclusions 133 Can sandy beach molluscs show an endogenous controlled Chapter 5 circatidal migration behaviour? Hints from a swash rig 135 experiment Abstract 136 3.5.1 Introduction 137 3.5.2 Material and Methods 139 3.5.3 Results 144 3.5.4 Discussion 146 3.5.5 Conclusions 149 Surfing on sandy beaches: an efficient strategy to flourish in a Chapter 6 151 highly dynamic environment? Abstract 152 3.6.1 Introduction 153 3.6.2 Material and Methods 155 3.6.3 Results 148 3.6.4 Theoretical models 168 3.6.5 Discussion 173 3.6.5 Conclusions 180 Appendix 1 181 Appendix 2 182 PART IV GENERAL DISCUSSION 185 4.1 Sandy beaches in Ecuador 187 4.2 Distribution of macrofauna in Ecuador 189 4.2.1 Temporal effects 190 4.2.2 Sandy beach macrofauna and ENSO 191 4.2.3 Spatial distribution 192 4.2.4 Explaining the spatial patterns 195 4.3 Biology of Olivella semistriata 199 4.3.1 Distribution of the species 199 4.3.2 Feeding habits 203 4.3.3 Surfing behaviour 204 4.4 Open questions 207 4.4.1 Studying macrofauna on exposed beaches 207 4.4.2 Macrofauna and ENSO 207 4.4.3 Olivella semistriata 207 TABLE OF CONTENTS PART V ADDENDA 209 Macrofaunal community structure and zonation of an Ecuadorian Addendum 1 211 sandy beach (bay of Valdivia) Critical note 228 Spatial and temporal patterns in the sandy beach surf zone Addendum 2 231 benthos of the tropical East Pacific. ENSO and sandy beach macrobenthos of the tropical East Addendum 3 255 Pacific: some speculations Reference List 267 DANKWOORD Dankwoord Dit doctoraat is het resultaat van vier jaar wetenschappelijk onderzoek aan de Sectie Mariene Biologie van de Universiteit Gent, in samewerking met de polytechnische universiteit van Guayaquil (ESPOL) in Ecuador. Het schrijven van een doctoraat, maar vooral het voorafgaande onderzoek, is een proces dat niet alleen de inzet van de doctorandus vergt, maar evenzeer de hulp, steun en motivatie van een hele reeks mensen, die ik bij deze dan ook graag in de bloemetjes wil zetten. Allereerst wil ik mijn promotor, Prof. Dr. Magda Vincx, bedanken om mij de kans te geven dit project te starten. Hoewel het een weg was met vele obstakels, is ze mij altijd blijven steunen. Haar rol in het effenen van de paden in Ecuador was zonder meer cruciaal, en ik heb mij er regelmatig over verbaasd hoe de naam La doctora Vincx deuren kon openen die anders zeker gesloten zouden blijven. De dagelijkse begeleiding lag in goeie handen van Dr. Steven Degraer, mijn co-promotor. Van het begin tot het einde van mijn doctoraat kon ik altijd rekenen op zijn wetenschappelijke creativiteit en zijn kracht om mensen te motiveren. Daarnaast speelde hij ook de soms ondankbare rol van ‘advocaat van de duivel’ bij het doornemen van mijn schrijfsels. Tenslotte wil ik Steven ook bedanken voor de twee korte trips die we samen in Ecuador gemaakt hebben, en die cruciaal gebleken zijn in de onderzoekslijn die ik uiteindelijk gevolgd heb. When in Ecuador, I could always count on the full support of the Oceanography and Marine Sciences departement of ESPOL and the aquaculture institute CENAIM in San Pedro. In ESPOL, I was always welcome in the lab of Dr. Maria Pilar de Cornejo. Dr. Jorge Calderon, Dr. Sam Stern, Ing. Andrés Pedrazzolli and Dr. Stanislaus Sonnenholzner guaranteed me total freedom in my work at CENAIM, even if many last-minute changes had to be arranged. I know it always seemed weird to the people of CENAIM that someone could do scientific research with nothing but a spade, a bucket and a frame, but I hope this PhD proves it can. Of course, I also want to thank my Ecuadorian colleagues, Sonnia, Luis, Veronica, Alba and Mare, for the happy times in Ecuador, and their help in translating my abstracts, summaries and talks into Spanish! Special thanks go to Galo, without whom I would never have survived the many road trips and sampling campaigns. DANKWOORD Uiteraard bepaalt de omgeving waarin je werkt voor een groot stuk de werkvreugde. Ik wil dan ook heel graag mijn collega’s en ex-collega’s van de Sectie Mariene Biologie bedanken voor een creëen van een gemoedelijke maar wetenschappelijk stimulerende sfeer. Ik denk dat ik bij zowat elke collega wel eens (of soms vele malen) ben langsgeweest met één of andere vraag. In het bijzonder zou ik graag Maarten, Marleen en Nancy vermelden voor hun hulp bij allerhande problemen die ik op mijn weg ben tegengekomen. De – voor mij althans – ingewikkelde wiskundige modellen van hoofdstuk zes werden opgebouwd door Bea. Mijn bureaugenoten, Jan, Veronique en Veronique wil ik bedanken voor de vele leuke babbels tussen het werk door. Ook mijn collega-strandjutters, Tom en Jeroen, verdienen een plaatsje in dit dankwoord, voor de vaak levendige discussies over beach indices en staalnameprotocols. De soms lange dagen werden een stuk lichter gemaakt door de aangename lunchpauzes met de resto-gangers. Voor allerhande praktische beslommeringen kon ik altijd terecht bij Isolde, Annick en Guy. Voor de verwerking van de sedimentstalen en hulp bij het bepalen van omgevingsvariabelen kon ik dan weer rekenen op Danielle, Bart en Dirk. Jurgen en Yves zorgden ervoor dat ik de swashomgeving kon nabootsen in het laboratorium door de swash rig te ontwerpen en te bouwen. Veel van het zware staalnamewerk en het uitsorteren van de stalen is gebeurd door mijn thesisstudenten, Eveline, Pieter, An, Lien en Leen, waarvoor mijn oprechte dank. Jullie verblijven in Ecuador zorgden voor een aangename afwisseling, en ik hou er heel mooie herinneringen aan over! Bij de verwerking van de soms moeilijk interpreteerbare gegevens heb ik veel hulp gehad aan de bezoekjes bij Frederik Hendrickx en Stijn Vansteelandt alsook aan de mailconversaties met Andrew Short en Dave Schoeman. De juryleden van mijn doctoraat hebben dankzij hun opmerkingen en suggesties geleid tot een beter eindproduct. In het dagelijks leven hebben een hele reeks mensen, elk op hun manier, een steentje bijgedragen tot dit werk, vaak zonder het te beseffen. Daarom, merci ‘foute vrienden’, ‘fotovrienden’, ‘biologievrienden’, ‘schaatsvrienden’, familie en schoonfamilie. In Ecuador, I had great nights out, and lots of diverting chats with mis amigos/-as Ecuatorianos/-as. DANKWOORD Mijn eerste stappen in de wondere wereld van de biologie heb ik gezet samen met mijn moeder en Oom Willem. De ervaringen die ik tijdens onze vele uitstapjes in binnen- en buitenland heb opgedaan, koester ik voor de rest van mijn leven. Mam, het is dankzij jouw steun en inzet dat ik heb kunnen en mogen doen wat ik graag doe. Vrijheid en zelfstandigheid zijn misschien wel de mooiste dingen die je in een opvoeding kan meekrijgen.
Load more

Recommended publications
  • What Can We Learn from Confusing Olivella Columellaris and O
    Biota Neotrop., vol. 12, no. 2 What can we learn from confusing Olivella columellaris and O. semistriata (Olivellidae, Gastropoda), two key species in panamic sandy beach ecosystems? Alison I. Troost1, Samantha D. Rupert1, Ariel Z. Cyrus1,. Frank V Paladino1,2, Benjamin F. Dattilo3 & Winfried S. Peters1,2,4 1Department of Biology, Indiana/Purdue University Fort Wayne, 2101 East Coliseum Boulevard, Fort Wayne, IN 46805‑1499, USA 2Goldring Marine Biology Station, Playa Grande, Santa Cruz, Guanacaste, Costa Rica 3Department of Geosciences, Indiana/Purdue University Fort Wayne, 2101 East Coliseum Boulevard, Fort Wayne, IN 46805‑1499, USA 4Corresponding author: Winfried S. Peters, e‑mail: [email protected] TROOST, A.I., RUPERT, S.D., CYRUS, A.Z., PALADINO, F.V., DATTILO, B.F. & PETERS, W.S. What can we learn from confusing Olivella columellaris and O. semistriata (Olivellidae, Gastropoda), two key species in panamic sandy beach ecosystems? Biota Neotrop. 12(2): http://www.biotaneotropica.org.br/v12n2/ en/abstract?article+bn02112022012 Abstract: Olivella columellaris (Sowerby 1825) and O. semistriata (Gray 1839) are suspension‑feeding, swash‑surfing snails on tropical sandy beaches of the east Pacific. While they often are the numerically dominant macrofaunal element in their habitats, their biology is poorly understood; the two species actually have been confused in all of the few publications that address their ecology. Frequent misidentifications in publications and collections contributed also to an overestimation of the geographic overlap of the two species. To provide a sound taxonomic basis for further functional, ecological, and evolutionary investigations, we evaluated the validity of diagnostic traits in wild populations and museum collections, and defined workable identification criteria.
    [Show full text]
  • Guide to the Systematic Distribution of Mollusca in the British Museum
    PRESENTED ^l)c trustee*. THE BRITISH MUSEUM. California Swcademu 01 \scienceb RECEIVED BY GIFT FROM -fitoZa£du^4S*&22& fo<?as7u> #yjy GUIDE TO THK SYSTEMATIC DISTRIBUTION OK MOLLUSCA IN III K BRITISH MUSEUM PART I HY JOHN EDWARD GRAY, PHD., F.R.S., P.L.S., P.Z.S. Ac. LONDON: PRINTED BY ORDER OF THE TRUSTEES 1857. PRINTED BY TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. PREFACE The object of the present Work is to explain the manner in which the Collection of Mollusca and their shells is arranged in the British Museum, and especially to give a short account of the chief characters, derived from the animals, by which they are dis- tributed, and which it is impossible to exhibit in the Collection. The figures referred to after the names of the species, under the genera, are those given in " The Figures of Molluscous Animals, for the Use of Students, by Maria Emma Gray, 3 vols. 8vo, 1850 to 1854 ;" or when the species has been figured since the appear- ance of that work, in the original authority quoted. The concluding Part is in hand, and it is hoped will shortly appear. JOHN EDWARD GRAY. Dec. 10, 1856. ERRATA AND CORRIGENDA. Page 43. Verenad.e.—This family is to be erased, as the animal is like Tricho- tropis. I was misled by the incorrectness of the description and figure. Page 63. Tylodinad^e.— This family is to be removed to PleurobrancMata at page 203 ; a specimen of the animal and shell having since come into my possession.
    [Show full text]
  • Redalyc.What Can We Learn from Confusing Olivella Columellaris And
    Biota Neotropica ISSN: 1676-0611 [email protected] Instituto Virtual da Biodiversidade Brasil Troost, Alison I.; Rupert, Samantha D.; Cyrus, Ariel Z.; Paladino, Frank V.; Dattilo, Benjamin F.; Peters, Winfried S. What can we learn from confusing Olivella columellaris and O. semistriata (Olivellidae, Gastropoda), two key species in panamic sandy beach ecosystems? Biota Neotropica, vol. 12, núm. 2, 2012, pp. 101-113 Instituto Virtual da Biodiversidade Campinas, Brasil Available in: http://www.redalyc.org/articulo.oa?id=199123113011 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Biota Neotrop., vol. 12, no. 2 What can we learn from confusing Olivella columellaris and O. semistriata (Olivellidae, Gastropoda), two key species in panamic sandy beach ecosystems? Alison I. Troost1, Samantha D. Rupert1, Ariel Z. Cyrus1,. Frank V Paladino1,2, Benjamin F. Dattilo3 & Winfried S. Peters1,2,4 1Department of Biology, Indiana/Purdue University Fort Wayne, 2101 East Coliseum Boulevard, Fort Wayne, IN 46805‑1499, USA 2Goldring Marine Biology Station, Playa Grande, Santa Cruz, Guanacaste, Costa Rica 3Department of Geosciences, Indiana/Purdue University Fort Wayne, 2101 East Coliseum Boulevard, Fort Wayne, IN 46805‑1499, USA 4Corresponding author: Winfried S. Peters, e‑mail: [email protected] TROOST, A.I., RUPERT, S.D., CYRUS, A.Z., PALADINO, F.V., DATTILO, B.F. & PETERS, W.S. What can we learn from confusing Olivella columellaris and O. semistriata (Olivellidae, Gastropoda), two key species in panamic sandy beach ecosystems? Biota Neotrop.
    [Show full text]
  • Macrofaunal Community Structure and Zonation of an Ecuadorian Sandy Beach (Bay of Valdivia)
    Belg. J. Zool., 134 (1) : 17-24 January 2004 Macrofaunal community structure and zonation of an Ecuadorian sandy beach (bay of Valdivia) Katrien Aerts1, Thomas Vanagt1, Steven Degraer1, Sonnia Guartatanga2, Jan Wittoeck1, Nancy Fockedey1, Maria Pilar Cornejo-Rodriguez2, Jorge Calderón3 and Magda Vincx1 1 Marine Biology Section, Department of Biology, Ghent University, Krijgslaan 281 S8, B-9000 Ghent, Belgium 2 Faculty of Marine Engineering and Marine Sciences, Escuela Superior Politécnica del Litoral (ESPOL), Campus Gustavo Galindo, Km 30.5 Vía Perimetral, P.O. Box 09-01-5863, Guayaquil, Ecuador 3 Centro Nacional de Acuicultura e Investigaciones Marinas (CENAIM), Campus Gustavo Galindo, Km 30.5 Vía Perimetral, P.O. Box 09-01-5863, Guayaquil, Ecuador Corresponding author : Thomas Vanagt, e-mail : [email protected] ABSTRACT. The sandy beach macrofauna of the Bay of Valdivia (Ecuador) was sampled in August-September 1999 along six replicate transects between the high and low water line. The sediment consisted of well-sorted, fine to medium sand. Taking into account the dimensionless fall velocity (Ω) and the relative tidal range, the beach was characterized as an exposed, low tide terrace - rip beach. The distribution of the macrofauna was mainly determined by the elevation on the beach. Thirty-one taxa were found throughout the study, varying between 10 and 22 taxa per transect. Molluscs were the most dominant taxon (overall average : 285 ind/m2, max. : 2135 ind/m2), followed by crustaceans. The gastropod Olivella semistriata (overall average : 243 ind/m2, max. : 2131 ind/m2) was the most abundant species. The crustaceans were the most diverse taxon (10 spp.); Haustorius sp., Excirolana braziliensis and Emerita rathbunae were the most abundant species.
    [Show full text]
  • Master Thesis
    University of Algarve Diet and feeding activity of Olivella minuta (Link, 1807) (Mollusca, Gastropoda, Olividae) along the intertidal – subtidal zone of a dissipative sandy beach in the north coast of São Paulo – Brazil Mariana Oliveira Silva Master Thesis Supervision of: Alexander Turra (DOB/IO/Universidade São Paulo) / Maria Alexandra Chícharo (CCMAR/Ualg) 2013 Diet and feeding activity of Olivella minuta (Link, 1807) (Mollusca, Gastropoda, Olividae) along the intertidal – subtidal zone of a dissipative sandy beach in the north coast of São Paulo – Brazil Declaração de autoria de trabalho “Declaro ser a autora deste trabalho, que é original e inédito. Autores e trabalhos consultados estão devidamente citados no texto e constam da listagem de referências incluída.” “A Universidade do Algarve tem o direito, perpétuo e sem limites geográficos, de arquivar e publicitar este trabalho através de exemplares impressos reproduzidos em papel ou de forma digital, ou por qualquer outro meio conhecido ou que venha a ser inventado, de o divulgar através de repositórios científicos e de admitir a sua cópia e distribuição com objetivos educacionais ou de investigação, não comerciais, desde que seja dado crédito ao autor e editor.” 2013 Agradecimentos Agradecer é o mínimo que eu posso fazer por todos aqueles que contribuíram para que este trabalho se concluísse. Acima de tudo quero agradecer aos meus pais, pela pessoa que sou hoje, por me darem a oportunidade de crescer todos os dias como pessoa e como ser humano. Obrigado por todos os momentos proporcionados que jamais esquecerei. Obrigado por nunca me permitirem desistir, e por terem- me mostrado que não existem limites para quem deseja e faz a sua parte! Obrigado.
    [Show full text]
  • 45-Jun-2017.Pdf
    Page 2 Vol. 45, No. 2 In 1972, a group of shell collectors saw the need for a nation- al organization devoted to the interests of shell collectors; to the beauty of shells, to their scientific aspects, and to the collecting and preser- vation of mollusks. This was the start of COA. Our membership includes AMERICAN CONCHOLOGIST, the official publication of the Conchol- novices, advanced collectors, scientists, and shell dealers from around the ogists of America, Inc., and issued as part of membership dues, is published world. In 1995, COA adopted a conservation resolution: Whereas there quarterly in March, June, September, and December, printed by JOHNSON are an estimated 100,000 species of living mollusks, many of great eco- PRESS OF AMERICA, INC. (JPA), 800 N. Court St., P.O. Box 592, Pontiac, IL 61764. All correspondence should go to the Editor. ISSN 1072-2440. nomic, ecological, and cultural importance to humans and whereas habitat Articles in AMERICAN CONCHOLOGIST may be reproduced with destruction and commercial fisheries have had serious effects on mollusk proper credit. We solicit comments, letters, and articles of interest to shell populations worldwide, and whereas modern conchology continues the collectors, subject to editing. Opinions expressed in “signed” articles are tradition of amateur naturalists exploring and documenting the natural those of the authors, and are not necessarily the opinions of Conchologists world, be it resolved that the Conchologists of America endorses respon- of America. All correspondence pertaining to articles published herein sible scientific collecting as a means of monitoring the status of mollusk or generated by reproduction of said articles should be directed to the Edi- species and populations and promoting informed decision making in tor.
    [Show full text]
  • Includes Abstracts of the
    Number 65 (August 2015) The Malacologist Page 1 NUMBER 65 AUGUST 2015 Contents EDITORIAL …………………………….. ............................2 ANNUAL GENERAL MEETING—SPRING 2015 Annual Report of Council ...........................................................21 NOTICES ………………………………………………….2 Election of officers ………………………………………….....24 RESEARCH GRANT REPORTS Molecular phylogeny of Chaetodermomorpha (=Caudofoveata) EUROMOL CONFERENCE Programme in retrospect ……………………………………….….25 (Mollusca). Conference Abstracts - Oral presentations………………….....26 Nina Mikkelsen …………………………….………………..4 - Poster presentations ……………...…..53 The Caribbean shipworm Teredothyra dominicensis (Bivalvia, Teredinidae) has invaded and established breeding populations FORTHCOMING MEETINGS …………………………….…..... 72 in the Mediterranean Sea. Molluscan Forum .......................................................................72 J. Reuben Shipway, Luisa Borges, Johann Müller GRANTS AND AWARDS OF THE SOCIETY.............................76 & Simon Cragg ……………………………………………….7 MEMBERSHIP NOTICES ………………………………………....77 ANNUAL AWARD Evolution of chloroplast sequestration in Sacoglossa (Gastropoda, Heterobranchia) Gregor Christa ...……………………………………………....10 AGM CONFERENCE Programme in retrospect Planktic Gastropods ……………...….12 Conference Abstracts - Oral presentations………………….....13 - Poster presentations …………….....…18 Includes abstracts of the .. Images from The heart of a dragon: extraordinary circulatory system of the scaly-foot gastropod revealed Chong Chen, Jonathan Copley, Katrin Linse,
    [Show full text]
  • Complexity of the Prey Spectrum of Agaronia Propatula (Caenogastropoda: Olividae), a Dominant Predator in Sandy Beach Ecosystems of Pacific Central America
    Complexity of the prey spectrum of Agaronia propatula (Caenogastropoda: Olividae), a dominant predator in sandy beach ecosystems of Pacific Central America Nathan J. Robinson1,2 and Winfried S. Peters2,3 1 Cape Eleuthera Island School, Cape Eleuthera Institute, Eleuthera, The Bahamas 2 Goldring-Gund Marine Biology Station, Playa Grande, Santa Cruz, Guanacaste, Costa Rica 3 School of Biological Sciences, Washington State University, Pullman, WA, USA ABSTRACT Olivid gastropods of the genus Agaronia are dominant predators within invertebrate communities on sandy beaches throughout Pacific Central America. At Playa Grande, on the Pacific Coast of Costa Rica, we observed 327 natural predation events by Agaronia propatula. For each predation event, we documented prey taxa and body size of both predator and prey. The relationship between predator and prey size differed for each of the four main prey taxa: bivalves, crustaceans, heterospecific gastropods, and conspecific gastropods (representing cannibalism). For bivalve prey, there was increased variance in prey size with increasing predator size. Crustaceans were likely subdued only if injured or otherwise incapacitated. Heterospecific gastropods (mostly Olivella semistriata) constituted half of all prey items, but were only captured by small and intermediately sized A. propatula. Large O. semistriata appeared capable of avoiding predation by A. propatula. Cannibalism was more prevalent among large A. propatula than previously estimated. Our findings suggested ontogenetic niche shifts in A. propatula and a significant role of cannibalism in its population dynamics. Also indicated were size-dependent Submitted 15 February 2018 defensive behavior in some prey taxa and a dynamic, fine-scale zonation of the Accepted 16 April 2018 beach.
    [Show full text]
  • What Can We Learn from Confusing Olivella Columellaris and O
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Opus: Research and Creativity at IPFW Indiana University - Purdue University Fort Wayne Opus: Research & Creativity at IPFW Biology Faculty Publications Department of Biology Opus Citation Alison I. Troost, Samantha D. Rupert, Ariel Z. Cyrus, Frank V. Paladino, Benjamin F. Dattilo, and Winfried S. Peters (2012). What can we learn from confusing Olivella columellaris and O. semistriata (Olivellidae, Gastropoda), two key species in panamic sandy beach ecosystems?. Biota Neotropica.12 (2), 101-113. The irV tual Institute of Biodiversity. http://opus.ipfw.edu/biology_facpubs/225 This Article is brought to you for free and open access by the Department of Biology at Opus: Research & Creativity at IPFW. It has been accepted for inclusion in Biology Faculty Publications by an authorized administrator of Opus: Research & Creativity at IPFW. For more information, please contact [email protected]. Summer 6-22-2012 What can we learn from confusing Olivella columellaris and O. semistriata (Olivellidae, Gastropoda), two key species in panamic sandy beach ecosystems? Alison I. Troost Indiana University - Purdue University Fort Wayne Samantha D. Rupert Indiana University - Purdue University Fort Wayne Ariel Z. Cyrus Indiana University - Purdue University Fort Wayne Frank V. Paladino Indiana University - Purdue University Fort Wayne, [email protected] Benjamin F. Dattilo Indiana University - Purdue University Fort Wayne, [email protected] See next page for additional authors This research is a product of the Department of Biology faculty at Indiana University-Purdue University Fort Wayne. Follow this and additional works at: http://opus.ipfw.edu/biology_facpubs Part of the Animal Sciences Commons, Biodiversity Commons, Biology Commons, and the Ecology and Evolutionary Biology Commons Author(s) Alison I.
    [Show full text]
  • Miscelänea Ecológica
    MISCELÄNEA ECOLÓGICA Antonio MijailL PÉREZ, Ph. D. Director Centro de Malacología/ Diversidad Animal Facultad de Ciencia, Tecnología y Ambiente Noviembre del 2001 PREFACIO Los artículos que se presentan en el presente folleto constituyen trabajos realizados por el autor durante el curso Ecología de Poblaciones 93-2 auspiciado por la OET (Organización para Estudios Tropicales) y la UCR (Universidad de Costa Rica) que se llevó a cabo en Costa Rica, entre los meses de enero y febrero de 1993. El objetivo de presentarlos como un todo obedece al interés de suministrar a otros colegas ecológos y estudiantes algunos trabajos de metodología más o menos sencilla y análisis estadísticos no complejos y detallados, que podrían repetirse en otros grupos de animales o plantas sin requerimiento de una logística difícil de adquirir. Este tipo de trabajos también podría aportar material para la preparación de artículos científicos o tesis de grado cuando se dispone de algún conocimiento general del grupo de estudio. Dado que el trabajo que realizo desde hace años está dirigido en su mayoría hacia el estudio de moluscos gastrópodos (caracoles) terrestres y fluviátiles, varios de los trabajos tratan sobre este tema. También se toca en dos trabajos la interacción de estos animales con otros grupos de animales; en uno de ellos la relación depredador-presa y en otro el uso de conchas de gasterópodos por parte de crustáceos decápodos que son conocidos como cangrejos hermitaños. Otro de los trabajos se refiere al estudio de algunos aspectos del cortejo, cópula y conducta de defensa en la araña Argiope trasfaciata. Este trabajo fue realizado por un grupo de compañeros que listan posteriormente coordinados por mí, según una idea del Dr.
    [Show full text]
  • The Behavioral and Sensory Ecology of Agaronia Propatula
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Opus: Research and Creativity at IPFW Indiana University - Purdue University Fort Wayne Opus: Research & Creativity at IPFW Biology Faculty Publications Department of Biology Spring 4-2012 The Behavioral and sensory ecology of Agaronia propatula (Caenogastropoda, Olivadae), a swash- surfing predator on sandy beaches of the panamic faunal province Ariel Cyrus Samantha Rupert Amy Silva Monika Graf Jeremy Rappaport See next page for additional authors This research is a product of the Department of Biology faculty at Indiana University-Purdue University Fort Wayne. Follow this and additional works at: http://opus.ipfw.edu/biology_facpubs Part of the Biology Commons, Evolution Commons, and the Marine Biology Commons Opus Citation Ariel Cyrus, Samantha Rupert, Amy Silva, Monika Graf, Jeremy Rappaport, Frank V. Paladino, and Winfried S. Peters (2012). The Behavioral and sensory ecology of Agaronia propatula (Caenogastropoda, Olivadae), a swash-surfing predator on sandy beaches of the panamic faunal province. Journal of Molluscan studies.2012, 1-11. http://opus.ipfw.edu/biology_facpubs/202 This Article is brought to you for free and open access by the Department of Biology at Opus: Research & Creativity at IPFW. It has been accepted for inclusion in Biology Faculty Publications by an authorized administrator of Opus: Research & Creativity at IPFW. For more information, please contact [email protected]. Author(s) Ariel Cyrus, Samantha Rupert, Amy Silva, Monika Graf, Jeremy Rappaport, Frank V. Paladino, and Winfried S. Peters This article is available at Opus: Research & Creativity at IPFW: http://opus.ipfw.edu/biology_facpubs/202 Journal of Molluscan Studies Advance Access published 29 April 2012 Journal of The Malacological Society of London Molluscan Studies Journal of Molluscan Studies (2012) 0: 1–11.
    [Show full text]
  • Proceedings of the United States National Museum
    REPORT ON A COLLECTION OF SHELLS FROM PERU, WITH A SUABIARY OF THE LITTORAL MARINE MOLLUSCA OF THE PERLWIAN ZOOLOGICAL PROVINCE. By William Healey Dall, Curator, Division of MoUusks, U. S. National Museum,. INTRODUCTION. LTnder the auspices of the Ministerio cle Fomento of Peru, Mr. R. E. Coker was engaged in making studies and collections of animals of the Peruvian coast with the intention of contributing to the knowl- edge of the aquatic resources of the country. In the course of this work numerous economic notes were made in relation to the animals obtained. On the portion of the collection consisting of Mollusca, the authori- ties of Peru, through the intervention of Mr. Coker, have requested the writer to prepare a report. It was found on looking into the matter that no systematic list of the shore mollusks of the Peruvian province had been published for more than half a century. It was thought that the value of this report to the naturalists of Peru and elsewhere would be consider- ably enhanced, after discussing the collection in question, if to it was added a list of the species reported as occurring on the shores of the Peruvian zoological province. The present report therefore contains both, together with illustrations of the chief economic mollusks of the Peruvian coast and islands contained in the collection. It should be said that specimens of this collection have been returned with identifications, to the Peruvian authorities, and another series retained in the U. S. National Museum for reference. The notes in small type were prepared by Mr.
    [Show full text]