Analysis of the Population Dynamics of Placida Dendritica and Codium Fragile in the Gulf of Maine and a Theoretical Discussion of Invasive Species

Total Page:16

File Type:pdf, Size:1020Kb

Analysis of the Population Dynamics of Placida Dendritica and Codium Fragile in the Gulf of Maine and a Theoretical Discussion of Invasive Species University of New Hampshire University of New Hampshire Scholars' Repository Doctoral Dissertations Student Scholarship Winter 2020 ANALYSIS OF THE POPULATION DYNAMICS OF PLACIDA DENDRITICA AND CODIUM FRAGILE IN THE GULF OF MAINE AND A THEORETICAL DISCUSSION OF INVASIVE SPECIES Seth Goodnight University of New Hampshire, Durham Follow this and additional works at: https://scholars.unh.edu/dissertation Recommended Citation Goodnight, Seth, "ANALYSIS OF THE POPULATION DYNAMICS OF PLACIDA DENDRITICA AND CODIUM FRAGILE IN THE GULF OF MAINE AND A THEORETICAL DISCUSSION OF INVASIVE SPECIES" (2020). Doctoral Dissertations. 2546. https://scholars.unh.edu/dissertation/2546 This Dissertation is brought to you for free and open access by the Student Scholarship at University of New Hampshire Scholars' Repository. It has been accepted for inclusion in Doctoral Dissertations by an authorized administrator of University of New Hampshire Scholars' Repository. For more information, please contact [email protected]. ANALYSIS OF THE POPULATION DYNAMICS OF PLACIDA DENDRITICA AND CODIUM FRAGILE IN THE GULF OF MAINE AND A THEORETICAL DISCUSSION OF INVASIVE SPECIES BY SETH GOODNIGHT B.A.: Biology and Chemistry – University of Colorado at Colorado Springs, 2006 M.S.: Zoology – University of New Hampshire, 2012 DISSERTATION Submitted to the University of New Hampshire in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy In Biological Sciences: Marine Biology Option December 2020 ii This thesis/dissertation was examined and approved in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Biological Sciences: Marine Biology Option by: Dissertation Director: Larry G. Harris Ph.D. Professor Emeritus, Biological Sciences. University of New Hampshire Dissertation Committee: Jessica A. Bolker Ph.D. Professor, Biological Sciences. University of New Hampshire James Haney Ph.D. Professor, Biological Sciences. University of New Hampshire Walter Lambert Ph.D. Professor, Biology. Framingham State University James Pringle Ph.D. Professor, Earth Sciences. University of New Hampshire On December 14, 2020 Approval signatures are on file with the University of New Hampshire Graduate School. iii CONTENTS Acknowledgements ...................................................................................................................... viii Abstract ........................................................................................................................................... x Introduction ..................................................................................................................................... 1 Chapter 1: Naturalized species: when are invasive species no longer considered invasive? ......... 7 Terminology ................................................................................................................................ 8 Introduction ............................................................................................................................... 10 Methods .................................................................................................................................... 18 Results ....................................................................................................................................... 20 Discussion ................................................................................................................................. 24 Gulf of Maine as a case study ................................................................................................... 27 Conclusion ................................................................................................................................ 34 Chapter 2: Effects of temperature on the life history characteristics of Placida dendritica ......... 37 Introduction ............................................................................................................................... 38 Methods .................................................................................................................................... 42 Results ....................................................................................................................................... 51 Discussion ................................................................................................................................. 61 Chapter 3: Population dynamics of Codium fragile and Placida dendritica ................................ 70 Introduction ............................................................................................................................... 71 Methods .................................................................................................................................... 76 Results ....................................................................................................................................... 81 Discussion ................................................................................................................................. 89 Chapter 4: Modeling population dynamics ................................................................................. 100 Introduction ............................................................................................................................. 101 Methods .................................................................................................................................. 103 Results ..................................................................................................................................... 110 Discussion ............................................................................................................................... 115 General conclusion...................................................................................................................... 120 References ................................................................................................................................... 124 Appendix I: R-Code for Chapter IV ........................................................................................... 136 iv FIGURES Figure 1: Codium fragile ssp. fragile. ............................................................................................. 5 Figure 2: Major water currents affecting the GoM. ........................................................................ 5 Figure 3: Histograms of the number of publications per five-year period ................................... 22 Figure 4: Relative collecting frequency (RCF) for three species of seaweed in the GoM. .......... 23 Figure 5: Number of publications for C. fragile in the GoM per 5-year period. .......................... 32 Figure 6: Relative collecting frequency (RCF) of C. fragile in the GoM. ................................... 32 Figure 7: Map of collection locations for C. fragile in the GoM .................................................. 33 Figure 8: Illustration of how processes with different Q10 values are affected by temperature. .. 41 Figure 9: Map of the Maine and New Hampshire coast. .............................................................. 49 Figure 10: Example of measurement procedure. .......................................................................... 50 Figure 11: Mean calculated lengths of P. dendritica used for reproductive rate trials. ................ 50 Figure 12: Box and whisker plot of the rate of egg mass production as a factor of temperature. 56 Figure 13: The average cumulative number of egg masses over 30 days. ................................... 56 Figure 14: Scatter plot showing the relationship between image size and egg count. .................. 57 Figure 15: Box and whisker plot of the numbers of eggs per egg mass ....................................... 58 Figure 16: Number of eggs in a mass as a function of the animal size. ........................................ 58 Figure 17: Number of eggs per egg mass vs. the sequential number of that egg mass. ............... 59 Figure 18: Total egg mass count per pair of P. dendritica. .......................................................... 59 Figure 19: Box and whisker plot showing the duration of embryonic development .................... 60 Figure 20: Recruitment at depth array. ......................................................................................... 79 Figure 21: Abundance of Codium fragile at Cape Neddick, ME. ................................................ 85 Figure 22: Photographs of C. fragile abundance at Cape Neddick, August 2015. ....................... 85 Figure 23: Recruitment rates of Placida dendritica at two sites. ................................................. 86 Figure 24: Comparison of C. fragile abundance and P. dendritica recruitment........................... 87 Figure 25: Recruitment of P. dendritica by depth at CML........................................................... 87 Figure 26: Average settlement by depth. ...................................................................................... 88 Figure 27: Chlorophyll a concentration in the GoM ..................................................................... 98 Figure 28: Conceptual flowchart depicting the population dynamic model. .............................. 108 Figure 29: Comparisons of model output based on changing Q10 values. .................................. 112 Figure 30: Comparison
Recommended publications
  • Kleptoplast Photoacclimation State Modulates the Photobehaviour of the Solar-Powered Sea Slug Elysia Viridis
    © 2018. Published by The Company of Biologists Ltd | Journal of Experimental Biology (2018) 221, jeb180463. doi:10.1242/jeb.180463 SHORT COMMUNICATION Kleptoplast photoacclimation state modulates the photobehaviour of the solar-powered sea slug Elysia viridis Paulo Cartaxana1, Luca Morelli1,2, Carla Quintaneiro1, Gonçalo Calado3, Ricardo Calado1 and Sónia Cruz1,* ABSTRACT light intensities, possibly as a strategy to prevent the premature loss Some sacoglossan sea slugs incorporate intracellular functional of kleptoplast photosynthetic function (Weaver and Clark, 1981; algal chloroplasts (kleptoplasty) for periods ranging from a few days Cruz et al., 2013). A distinguishable behaviour in response to light to several months. Whether this association modulates the has been recorded in Elysia timida: a change in the position of its photobehaviour of solar-powered sea slugs is unknown. In this lateral folds (parapodia) from a closed position to a spread, opened study, the long-term kleptoplast retention species Elysia viridis leaf-like posture under lower irradiance and the opposite behaviour showed avoidance of dark independently of light acclimation state. under high light levels (Rahat and Monselise, 1979; Jesus et al., In contrast, Placida dendritica, which shows non-functional retention 2010; Schmitt and Wägele, 2011). This behaviour in response to of kleptoplasts, showed no preference over dark, low or high light. light changes was only recorded for this species and has been assumed to be linked to long-term retention of kleptoplasts (Schmitt High light-acclimated (HLac) E. viridis showed a higher preference for and Wägele, 2011). high light than low light-acclimated (LLac) conspecifics. The position of the lateral folds (parapodia) was modulated by irradiance, with In this study, we determine whether the photobehaviour of increasing light levels leading to a closure of parapodia and protection the solar-powered sea slug Elysia viridis is linked to the of kleptoplasts from high light exposure.
    [Show full text]
  • Frontiers in Zoology Biomed Central
    Frontiers in Zoology BioMed Central Research Open Access Functional chloroplasts in metazoan cells - a unique evolutionary strategy in animal life Katharina Händeler*1, Yvonne P Grzymbowski1, Patrick J Krug2 and Heike Wägele1 Address: 1Zoologisches Forschungsmuseum Alexander Koenig, Adenauerallee 160, 53113 Bonn, Germany and 2Department of Biological Sciences, California State University, Los Angeles, California, 90032-8201, USA Email: Katharina Händeler* - [email protected]; Yvonne P Grzymbowski - [email protected]; Patrick J Krug - [email protected]; Heike Wägele - [email protected] * Corresponding author Published: 1 December 2009 Received: 26 June 2009 Accepted: 1 December 2009 Frontiers in Zoology 2009, 6:28 doi:10.1186/1742-9994-6-28 This article is available from: http://www.frontiersinzoology.com/content/6/1/28 © 2009 Händeler et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract Background: Among metazoans, retention of functional diet-derived chloroplasts (kleptoplasty) is known only from the sea slug taxon Sacoglossa (Gastropoda: Opisthobranchia). Intracellular maintenance of plastids in the slug's digestive epithelium has long attracted interest given its implications for understanding the evolution of endosymbiosis. However, photosynthetic ability varies widely among sacoglossans; some species have no plastid retention while others survive for months solely on photosynthesis. We present a molecular phylogenetic hypothesis for the Sacoglossa and a survey of kleptoplasty from representatives of all major clades. We sought to quantify variation in photosynthetic ability among lineages, identify phylogenetic origins of plastid retention, and assess whether kleptoplasty was a key character in the radiation of the Sacoglossa.
    [Show full text]
  • Biodiversity Journal, 2020, 11 (4): 861–870
    Biodiversity Journal, 2020, 11 (4): 861–870 https://doi.org/10.31396/Biodiv.Jour.2020.11.4.861.870 The biodiversity of the marine Heterobranchia fauna along the central-eastern coast of Sicily, Ionian Sea Andrea Lombardo* & Giuliana Marletta Department of Biological, Geological and Environmental Sciences - Section of Animal Biology, University of Catania, via Androne 81, 95124 Catania, Italy *Corresponding author: [email protected] ABSTRACT The first updated list of the marine Heterobranchia for the central-eastern coast of Sicily (Italy) is here reported. This study was carried out, through a total of 271 scuba dives, from 2017 to the beginning of 2020 in four sites located along the Ionian coasts of Sicily: Catania, Aci Trezza, Santa Maria La Scala and Santa Tecla. Through a photographic data collection, 95 taxa, representing 17.27% of all Mediterranean marine Heterobranchia, were reported. The order with the highest number of found species was that of Nudibranchia. Among the study areas, Catania, Santa Maria La Scala and Santa Tecla had not a remarkable difference in the number of species, while Aci Trezza had the lowest number of species. Moreover, among the 95 taxa, four species considered rare and six non-indigenous species have been recorded. Since the presence of a high diversity of sea slugs in a relatively small area, the central-eastern coast of Sicily could be considered a zone of high biodiversity for the marine Heterobranchia fauna. KEY WORDS diversity; marine Heterobranchia; Mediterranean Sea; sea slugs; species list. Received 08.07.2020; accepted 08.10.2020; published online 20.11.2020 INTRODUCTION more researches were carried out (Cattaneo Vietti & Chemello, 1987).
    [Show full text]
  • THE NAUTILUS [Vol
    2 2 THE NAUTILUS [Vol. 69 (1) separated from each other by five centimeters. The snail was expanded with its head oriented away from the clam. When placed on the sand, the clam showed no activity during the next 30 minutes after which observations were discontinued. All but the lower (anterior) end of the body of the clam was covered by an envelope of slime secreted by the foot of the snail. It seems clear that P. duplicatus capturesEnsis directus by approaching it below the surface of the substratum and by ir­ ritating the lower portion so that it retreats upward. The snail then coats the razor clam with an envelope of slime which ap­ pears to have anesthetic properties. Successful capture proba­ bly depends on the ability of the snail to maintain contact with its prey until anesthesia takes place. ON THE OCCURRENCE OF THE NUDIBRANCH ALDERIA MODESTA (LOVÉN, 1844) ON THE CENTRAL CALIFORNIAN COAST By CADET HAND and JOAN STEINBERG Department of Zoology, University of California, Berkeley Alderia modesta (Loven, 1844) has long been known from the coasts of northern Europe. It has been recorded from as far north as the Trondheim Fjord in Norway (Norman, 1893), south to Skibbereen in Ireland (Allman, 1845) and on the French coast (Gollien, 1929). Therefore, it has been of con­ siderable interest to us to find well-established populations of an Alderia in two localities on the central Californian coast. Through the kindness of Monsieur G. Van Put of the Royal Institute of Natural Sciences of Belgium in Brussels and Dr.
    [Show full text]
  • Nudibranch Range Shifts Associated with the 2014 Warm Anomaly in the Northeast Pacific
    Bulletin of the Southern California Academy of Sciences Volume 115 | Issue 1 Article 2 4-26-2016 Nudibranch Range Shifts associated with the 2014 Warm Anomaly in the Northeast Pacific Jeffrey HR Goddard University of California, Santa Barbara, [email protected] Nancy Treneman University of Oregon William E. Pence Douglas E. Mason California High School Phillip M. Dobry See next page for additional authors Follow this and additional works at: https://scholar.oxy.edu/scas Part of the Marine Biology Commons, Population Biology Commons, and the Zoology Commons Recommended Citation Goddard, Jeffrey HR; Treneman, Nancy; Pence, William E.; Mason, Douglas E.; Dobry, Phillip M.; Green, Brenna; and Hoover, Craig (2016) "Nudibranch Range Shifts associated with the 2014 Warm Anomaly in the Northeast Pacific," Bulletin of the Southern California Academy of Sciences: Vol. 115: Iss. 1. Available at: https://scholar.oxy.edu/scas/vol115/iss1/2 This Article is brought to you for free and open access by OxyScholar. It has been accepted for inclusion in Bulletin of the Southern California Academy of Sciences by an authorized editor of OxyScholar. For more information, please contact [email protected]. Nudibranch Range Shifts associated with the 2014 Warm Anomaly in the Northeast Pacific Cover Page Footnote We thank Will and Ziggy Goddard for their expert assistance in the field, Jackie Sones and Eric Sanford of the Bodega Marine Laboratory for sharing their observations and knowledge of the intertidal fauna of Bodega Head and Sonoma County, and David Anderson of the National Park Service and Richard Emlet of the University of Oregon for sharing their respective observations of Okenia rosacea in northern California and southern Oregon.
    [Show full text]
  • Assessing the Impact of Key Marine Invasive Non-Native Species on Welsh MPA Habitat Features, Fisheries and Aquaculture
    Assessing the impact of key Marine Invasive Non-Native Species on Welsh MPA habitat features, fisheries and aquaculture. Tillin, H.M., Kessel, C., Sewell, J., Wood, C.A. Bishop, J.D.D Marine Biological Association of the UK Report No. 454 Date www.naturalresourceswales.gov.uk About Natural Resources Wales Natural Resources Wales’ purpose is to pursue sustainable management of natural resources. This means looking after air, land, water, wildlife, plants and soil to improve Wales’ well-being, and provide a better future for everyone. Evidence at Natural Resources Wales Natural Resources Wales is an evidence based organisation. We seek to ensure that our strategy, decisions, operations and advice to Welsh Government and others are underpinned by sound and quality-assured evidence. We recognise that it is critically important to have a good understanding of our changing environment. We will realise this vision by: Maintaining and developing the technical specialist skills of our staff; Securing our data and information; Having a well resourced proactive programme of evidence work; Continuing to review and add to our evidence to ensure it is fit for the challenges facing us; and Communicating our evidence in an open and transparent way. This Evidence Report series serves as a record of work carried out or commissioned by Natural Resources Wales. It also helps us to share and promote use of our evidence by others and develop future collaborations. However, the views and recommendations presented in this report are not necessarily those of
    [Show full text]
  • OREGON ESTUARINE INVERTEBRATES an Illustrated Guide to the Common and Important Invertebrate Animals
    OREGON ESTUARINE INVERTEBRATES An Illustrated Guide to the Common and Important Invertebrate Animals By Paul Rudy, Jr. Lynn Hay Rudy Oregon Institute of Marine Biology University of Oregon Charleston, Oregon 97420 Contract No. 79-111 Project Officer Jay F. Watson U.S. Fish and Wildlife Service 500 N.E. Multnomah Street Portland, Oregon 97232 Performed for National Coastal Ecosystems Team Office of Biological Services Fish and Wildlife Service U.S. Department of Interior Washington, D.C. 20240 Table of Contents Introduction CNIDARIA Hydrozoa Aequorea aequorea ................................................................ 6 Obelia longissima .................................................................. 8 Polyorchis penicillatus 10 Tubularia crocea ................................................................. 12 Anthozoa Anthopleura artemisia ................................. 14 Anthopleura elegantissima .................................................. 16 Haliplanella luciae .................................................................. 18 Nematostella vectensis ......................................................... 20 Metridium senile .................................................................... 22 NEMERTEA Amphiporus imparispinosus ................................................ 24 Carinoma mutabilis ................................................................ 26 Cerebratulus californiensis .................................................. 28 Lineus ruber .........................................................................
    [Show full text]
  • Bonnemaisonia Hamifera Hariot, 1891
    Bonnemaisonia hamifera Hariot, 1891 AphiaID: 144442 . Plantae (Reino) >Biliphyta (Subreino) >Rhodophyta (Filo) >Eurhodophytina (Subdivisao) >Florideophyceae (Classe) > Rhodymeniophycidae (Subclasse) > Bonnemaisoniales (Ordem) > Bonnemaisoniaceae (Familia) Sinónimos Asparagopsis hamifera (Hariot) Okamura, 1921 Trailliella intricata Batters, 1896 Referências additional source Guiry, M.D. & Guiry, G.M. (2019). AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. , available online at http://www.algaebase.org [details] additional source Integrated Taxonomic Information System (ITIS). , available online at http://www.itis.gov [details] basis of record Guiry, M.D. (2001). Macroalgae of Rhodophycota, Phaeophycota, Chlorophycota, and two genera of Xanthophycota, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 20-38[details] additional source Sears, J.R. (ed.). 1998. NEAS keys to the benthic marine algae of the northeastern coast of North America from Long Island Sound to the Strait of Belle Isle. Northeast Algal Society. 163 p. [details] additional source South, G. R.;Tittley, I. (1986). A checklist and distributional index of the benthic marine algae of the North Atlantic Ocean. untsman Marine Laboratory. St. Andrews, New Brunswick. 1-76. [details] additional source Streftaris, N.; Zenetos, A.; Papathanassiou, E. (2005). Globalisation in marine ecosystems: the story of non-indigenous marine species across European seas. Oceanogr. Mar. Biol. Ann. Rev. 43: 419-453. [details] additional source Zenetos, A.; Çinar, M.E.; Pancucci-Papadopoulou, M.A.; Harmelin, J.-G.; Furnari, G.; Andaloro, F.; Bellou, N.; Streftaris, N.; Zibrowius, H. (2005). Annotated list of marine alien species in 1 the Mediterranean with records of the worst invasive species.
    [Show full text]
  • New Records of Marine Algae from the 1974 R /V Dobbin Cruise to the Gulf of California
    SMITHSONIAN CONTRIBUTIONS TO BOTANY NUMBER 34 New Records of Marine Algae from the 1974 R /V Dobbin Cruise to the Gulf of California James N. Norris and Xatina E. Bucher SMITHSONIAN INSTITUTION PRESS City of Washington 1976 ABSTRACT Norris, J. N., and K. E. Bucher. New Records of Marine Algae from the 1974 R/V Dolphin Cruise to the Gulf of California. Smithsonian Contributions to Botany, number 34, 22 pages, 13 figures, 1976.-Six species of benthic marine algae (one Chlorophyta, two Phaeophyta, and three Rhodophyta) are newly reported from the Gulf of California, hfexico. Species of Halicystis, Sporochnus, Bonnemaisonia, Dudresnnya, and Sebdenia represent genera new to the Gulf, with the last being new to North America. The distribu~ionof twelve other species is extended. Two new nomenclatural combinations, Dasya bailloziviana var. nudicaulus and Dasya baillouviana var, stanfordiana, are proposed. The morphological variation of some species is discussed. Spermatangia of Dudresnnya colombiana, and tetrasporangia and spermatangia of Kallymenia pertusa are re- ported and described for the first time. OFFICIALPUBLICATION DATE is handstam ed in a limited number of initial copies and is recorded in the Institution's annual report, Srnit!sonian Year. SERIESCOVER DESIGN: Leaf clearing from the katsura tree Cercidiphyllum japonicum Siebold and Zuccarini. Library of Congress Cataloging in Publication Data Norris, James N. New records of marine algae from the 1974 R/V Dolphin cruise to the Gulf of California. (Smithsonian contributions to botany ; no. 34) Bibliography: p. 1. Marine algae-California, Gulf of. 2. R/V Dolphin (Ship) I. Bucher, Katina E., joint author. 11. Title 111.
    [Show full text]
  • An Annotated Checklist of the Marine Macroinvertebrates of Alaska David T
    NOAA Professional Paper NMFS 19 An annotated checklist of the marine macroinvertebrates of Alaska David T. Drumm • Katherine P. Maslenikov Robert Van Syoc • James W. Orr • Robert R. Lauth Duane E. Stevenson • Theodore W. Pietsch November 2016 U.S. Department of Commerce NOAA Professional Penny Pritzker Secretary of Commerce National Oceanic Papers NMFS and Atmospheric Administration Kathryn D. Sullivan Scientific Editor* Administrator Richard Langton National Marine National Marine Fisheries Service Fisheries Service Northeast Fisheries Science Center Maine Field Station Eileen Sobeck 17 Godfrey Drive, Suite 1 Assistant Administrator Orono, Maine 04473 for Fisheries Associate Editor Kathryn Dennis National Marine Fisheries Service Office of Science and Technology Economics and Social Analysis Division 1845 Wasp Blvd., Bldg. 178 Honolulu, Hawaii 96818 Managing Editor Shelley Arenas National Marine Fisheries Service Scientific Publications Office 7600 Sand Point Way NE Seattle, Washington 98115 Editorial Committee Ann C. Matarese National Marine Fisheries Service James W. Orr National Marine Fisheries Service The NOAA Professional Paper NMFS (ISSN 1931-4590) series is pub- lished by the Scientific Publications Of- *Bruce Mundy (PIFSC) was Scientific Editor during the fice, National Marine Fisheries Service, scientific editing and preparation of this report. NOAA, 7600 Sand Point Way NE, Seattle, WA 98115. The Secretary of Commerce has The NOAA Professional Paper NMFS series carries peer-reviewed, lengthy original determined that the publication of research reports, taxonomic keys, species synopses, flora and fauna studies, and data- this series is necessary in the transac- intensive reports on investigations in fishery science, engineering, and economics. tion of the public business required by law of this Department.
    [Show full text]
  • Marine Algae of Amchitka Island (Aleutian Islands)
    Marine Algae of Amchitka Island (Aleutian Islands). II. Bonnemaisoniaceae' MICHAEL J. WYNNE2 ABSTRACT: Pleuroblepbaris stichidophora gen. et sp. nov., from Amchitka Island in the Aleutian Island s, is described as new to science. This taxon is the only repre­ sentative of the Bonnemaisoniaceae (Nemaliales, Rhodophyta) collected at Am­ chitka. It is distinguished from other members of the family by the presence of macroscopic tetrasporophytes with compound tetrasporangial stichidia arising along the margins of laminate axes. These tetrasporic branchlets are homologous to in­ determinate branches. Gland cells with brownish contents are present over the sur­ face of the laminate axes and also on the stichidia. Although numerous specimens have been collected, tetrasporic plants are the only fertile stages observed so far. T HE FAMILY BONNEMAISONIACEAE (Nemali­ axibus processuum determinatorum nascuntur; ales, Rhodophyta) is represented at Amchitka filamentum primarium ramulorum tetraspori­ Island in the Aleutian Archipelago by a single corum uniseriatum, e cellulis trapezoideis quae species of an undescribed genus. The first paper duos ordines stichidiorum alternantium efficiunt in this series (Wynne, 1970 ) has furn ished compositum. Tetrasporangia cruciate divisa 50­ the histor ical background of phycological ac­ 55 fA. diam ., 2 (interdum 3) ad omnen altitudi­ tivity in the Aleutians and environs, and has nem stichidii nisi segmentis infimis superioribus­ also reported on the location of Amchitka Is­ que reperta. Glandicellulae nencon in stichidio land and of the various collection sites men­ repertae. tioned in the present account. Thalli consisting of branched, flattened, rib­ Pleuroblepharis stichidophora gen. et sp. nov. bon-like axes, 5 to 10 (to 15 ) em long, to 4 mm broad ; growth by means of a single apical Figs.
    [Show full text]
  • From Introduced Species to Invader: What Determines Variation in the Success of <Emphasis Type="Italic">Codium F
    HELGOL,~NDER MEERESUNTERSUCHUNGEN Helgol~inder Meeresunters. 52, 277-289 11999) From introduced species to invader: what determines variation in the success of Codiumfragile ssp. tomentosoides (Chlorophyta) in the North Atlantic Ocean? Annelise Sabine Chapman ~ * * Institute of Marine Sciences, University of Portsmouth, Ferry Rd., Eastney, Portsmouth P04 9LY, UK ABSTRACT: The green alga Codium fragile ssp. tomentosoides (Chlorophyta) has been introduced accidentally and successfully from Japan to many shores of the northern and southern hemi- spheres, including those of the Northeast and Northwest Atlantic Ocean. On most European coasts, Codium occurs regularly but at low abundances in the intertidal zone and is absent from subtidal habitats, tn contrast. Codium is extremely abundant in subtidal kelp beds in the Northwest Atlantic Ocean where it often reaches nuisance proportions. This differential success cannot be accounted for by either the properties of the invader or by physico-chemical differences between invaded coasts. A theoretical comparison between two regions on opposite sides of the Atlantic Ocean, i.e. Eastern Nova Scotia, Canada, and south central Britain, illustrates how the resident benthic com- munity may determine the difference in relative abundance of Codium in subtidal habitats be- tween northeast America and Europe. In this review, low floral species diversity, biological distur- bance and facilitation by a previous species invasion are suggested as potential factors for the es- tablishment, success and abundance of Codium in the Northwest Atlantic Ocean, but these require testing in field experiments. INTRODUCTION Studies of the ecology of species introductions into novel marine environments have often emphasized (1) the properties of successfully invading species, (2) the character- istics of frequently invaded communities or (3) the transport vectors involved in over- coming barriers of space, climate or habitat (e.g.
    [Show full text]