DOCSLIB.ORG

Patterns and Dynamics of Context-Dependency in the Marine Rocky Intertidal

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Patterns and Dynamics of Context-Dependency in the Marine Rocky Intertidal AN ABSTRACT OF THE THESIS OF Eric Layani Berlow for the degree of Doctor of Philosophy in Zoology presented on 9 June, 1995. Title: Patterns and Dynamics of Context-Dependency in the Marine Rocky Intertidal Abstract approved: Redacted for Privacy Bruce A. Menge Abstract approved: Redacted for Privacy Jane Lubchenco As ecologists are being called upon to predict the consequences of human perturbations to natural communities, an important goal is to understand what factors drive variability or consistency in nature. In the rocky intertidal of San Juan Island, Washington, a comparative experimental approach was used to investigate spatial and temporal variation in community organization. The effect of predation on B. glandula varied dramatically over small spatial scales between microhabitats but was remarkably consistent over time withing a given microhabitat. The effects of predation on S. cariosus varied over time within the same microhabitat. By repeating previous landmark experiments at our study site, and replicating these experiments across microhabitats, the domain of applicability of previous experimental information was greatly expanded. In an early successional assemblage on the Oregon coast, I tested the hypothesis that, when the direct effect of one species on another increases in relative strength, its total effect (direct + indirect) is less variable or conditional than if the link between those species is weak. The effect of strong predation by whelks was less sensitive to the presence of additional species and more consistently dampened natural variation between experimental starting dates and between individual replicates within a given experiment. In contrast, the outcome of weak predation was more spatially and temporally variable in sign, and whether it magnified or dampened differences between individual replicates varied between experiments. Consequently the mean total effect of weak predation generally did not differ significantly from zero. However, in some cases, the range of variation (both within and between experiments) in the effect of weak predation exceeded the magnitude of the strongest total effect observed. Longer term results of the experiments on the Oregon coast examined the role of historic factors in influencing the degree to which successional paths are canalized and repeatable or contingent and variable. Succession in mid-intertidal patches in the mussel bed displayed complex patterns of historic effects that varied between species and between different stages of succession. Despite its potential complexity, this system exhibited some consistent and repeatable patterns of succession. Some important canalizing, or noise-dampening forces in this system included: 1) physiological and life- history constraints, 2) compensatory responses of functionally redundant species, and 3) strong interactions between species. Patterns and Dynamics of Context-Dependency in the Marine Rocky Intertidal by Eric Layani Berlow A THESIS submitted to Oregon State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy Completed 9 June, 1995 Commencement June 1996 Doctor of Philosophy thesis of Eric L. Berlow presented on June 9, 1995 APPROVED: Redacted for Privacy Co-Major Redacted for Privacy Co-Maj Redacted for Privacy Head of Department of Zoology Redacted for Privacy Dean of I understand that my thesis will become part of the permanent collection of Oregon State University libraries. My signature below authorizes release of my thesis to any reader upon request. Redacted for Privacy Eric L. Berlow ACKNOWLEDGMENTS Science is inherently a social phenomenon. Many people have been instrumental in shaping my world view, my thought processes, the questions that have fascinated me, and the approaches I have taken to answer them. Most of those people, of course, are people I have never met. But of those that I have been fortunate enough to know, some who have had particularly strong effects on me (both direct and indirect), deserve particular recognition. While this thesis focuses on the importance of context-dependency, I am indebted to Nadine, Sheldon and Alexa Berlow, Mary Berlow, Celine, Arys, and Patrick Layani, and Jeanne Panek for their truly context-independent love and encouragement. It is only with these solid pillars of support that I have been able to so freely and confidently explore what life has to offer. Nadine and Sheldon also provided the foundation of a bicultural setting that stretched my synapses and shaped much of my current thinking. Jeanne Panek has been a truly dialectical inspiration. In the past 4 years she has taught me that it is possible to simultaneously take oneself more seriously and less seriously; to be both more self-confident, but less over-bearing; to be both more independent, yet less selfish; to give freely, yet receive graciously, and to pursue ideas and dreams will boundless energy, while being flexible enough to change course quickly when new opportunities arise. She allowed me to better appreciate what graduate school had to offer by making it less central to my life, and she has given me reason to simultaneously savor the present and eagerly anticipate the future. Hugh Lefcort single-handedly saved me during my first year in Oregon. At times when I felt like a foreigner in a strange land, he, Jeanne Panek, and Bill Langford spoke my native tongue and gave me family. Mental wanderings on different, yet overlapping, paths with all three have shaped my thinking and my approach to science in countless, intangible ways. Edwin McGowan and Jim Norwalk are responsible for introducing me to the wonders of nature despite our growing up in a pot-hole-riddled city in the Rust Belt. They have been a constant reminder that nature comes before theory. On the other hand, Roy Kreitner, Dave Shenk, Jeremy Benjamin, and Rebecca Holcombe introduced me to the value of abstraction, of thinking about thinking, and of exploring commonalities between disparate fields of inquiry. Needless to say, my advisors Bruce Menge and Jane Lubchenco have made enormous contributions to my thesis and many other aspects of my education and development. With different thinking styles and sometimes contrasting approaches to science, they have been complementary mentors. Bruce's incessant curiosity and enthusiasm in the field, his untiring patience and unabashed honesty, and his ability to manage complex, multivariate information as if he were playing with a Leggo set is a constant reminder of what true science is supposed to be like. Jane's direct and incisive thinking style, her people skills, and her energetic devotion to bridging the gap between basic and applied research have provided an inspirational model for what dedicated scientists can offer society. I am also grateful to my other committee members. Mark Hixon's incredible capacity for synthesis has taught me that, yes, it is possible to summarize all of community ecology in a one-page flow chart. Bruce McCune has expanded my thinking by encouraging me to turn my brain inside-out and think upside-down and backwards. Gary De Lander has convinced me that Nutra-Sweet must be an essential micro-nutrient. All have been patient with my sometimes non-linear style of communication. I would also like to thank all my siblings in the Lubmengo family and the other members of the fifth-floor gang for all their help, encouragement, and camaraderie. In particular Gary Allison, Carol Blanchette, Dave Booth, Mark Carr, Jeff Harding, Dwayne Meadows, Karina Nielsen, Annette Olson, Deirdre Roberts, Eric Sanford, Cynthia Trowbridge, and Peter van Tame len have all helped out in various ways. Carol Blanchette served as my steady model for stress management and helped to ground my convoluted thinking in reality. Sergio Navarrete served as my mentor and surrogate advisor. Many late-night (but never early morning) and sometimes heated discussions with Sergio influenced much of my thinking about ecology. Collaborations in joint research projects, engaging discussions in the field about experimental design, and his generous advice about statistics shaped, not only the ideas presented in this thesis, but also my general thinking about the process of science. I also learned more about the subtleties of the English language from Sergio's eloquent communication style than from any native speaker I've ever met. I am extremely grateful to all the individuals who got up before sunrise to work spring and summer low tides or huddled around the Coleman lantern after sunset during stormy winter low tides. They volunteered their time to hours of data collection and physical labor in often cold, rainy weather, and, miraculously, came back for more the next day. Maybe it was the lack of mosquitoes. While the list of individuals is long and all the help was invaluable, I would like to particularly acknowledge Alexa Berlow, Kamichia Buzzard, Bryon Daley, Steve Howard, Sarah Lucas, Cathy Needham, Jeanne Panek, Brian Profit, Tara Panek, Stephanie Suskie, and Evie Wieters. I am also very grateful to Betsy and Alice King for providing privileged, first-class access to Fogarty Creek, a field site with aesthetic appeal in any weather. I thank the financial support I received from Sigma Xi Grants-in-Aid of Research, a Phycological Society of America Croasdale Fellowship, Holt Marine Education Fund Grants, OSU Zoology Department Teaching Assistantships, ZoRF (the Zoology Department Research Fund), generous support from Sheldon M. Berlow, National Science Foundation projects OCE 88-11369 amd OCE 92-17459 to Bruce Menge, and an Andrew Mellon Foundation grant to Bruce Menge and Jane Lubchenco. TABLE OF CONTENTS Page CHAPTER I GENERAL INTRODUCTION- 1 CHAPTER II GENERALIZING FROM FIELD EXPERIMENTS: SPATIAL AND TEMPORAL VARIATION IN COMMUNITY ORGANIZATION 5 Abstract 5 Introduction 6 The System 9 Methods 13 I. Patterns of community structure 13 II. Effect of Semibalanus on the distribution of whelks and limpets 14 III. Measurement of physical conditions inside/outside Semibalanus beds 16 IV. Predator manipulations: Effects of Semibalanus on whelk and limpet foraging. 18 Data Analysis 24 Results 26 I.
Load more

Recommended publications
  • GASTROPOD CARE SOP# = Moll3 PURPOSE: to Describe Methods Of
    GASTROPOD CARE SOP# = Moll3 PURPOSE: To describe methods of care for gastropods. POLICY: To provide optimum care for all animals. RESPONSIBILITY: Collector and user of the animals. If these are not the same person, the user takes over responsibility of the animals as soon as the animals have arrived on station. IDENTIFICATION: Common Name Scientific Name Identifying Characteristics Blue topsnail Calliostoma - Whorls are sculptured spirally with alternating ligatum light ridges and pinkish-brown furrows - Height reaches a little more than 2cm and is a bit greater than the width -There is no opening in the base of the shell near its center (umbilicus) Purple-ringed Calliostoma - Alternating whorls of orange and fluorescent topsnail annulatum purple make for spectacular colouration - The apex is sharply pointed - The foot is bright orange - They are often found amongst hydroids which are one of their food sources - These snails are up to 4cm across Leafy Ceratostoma - Spiral ridges on shell hornmouth foliatum - Three lengthwise frills - Frills vary, but are generally discontinuous and look unfinished - They reach a length of about 8cm Rough keyhole Diodora aspera - Likely to be found in the intertidal region limpet - Have a single apical aperture to allow water to exit - Reach a length of about 5 cm Limpet Lottia sp - This genus covers quite a few species of limpets, at least 4 of them are commonly found near BMSC - Different Lottia species vary greatly in appearance - See Eugene N. Kozloff’s book, “Seashore Life of the Northern Pacific Coast” for in depth descriptions of individual species Limpet Tectura sp. - This genus covers quite a few species of limpets, at least 6 of them are commonly found near BMSC - Different Tectura species vary greatly in appearance - See Eugene N.
    [Show full text]
  • Download Download
    Appendix C: An Analysis of Three Shellfish Assemblages from Tsʼishaa, Site DfSi-16 (204T), Benson Island, Pacific Rim National Park Reserve of Canada by Ian D. Sumpter Cultural Resource Services, Western Canada Service Centre, Parks Canada Agency, Victoria, B.C. Introduction column sampling, plus a second shell data collect- ing method, hand-collection/screen sampling, were This report describes and analyzes marine shellfish used to recover seven shellfish data sets for investi- recovered from three archaeological excavation gating the siteʼs invertebrate materials. The analysis units at the Tseshaht village of Tsʼishaa (DfSi-16). reported here focuses on three column assemblages The mollusc materials were collected from two collected by the researcher during the 1999 (Unit different areas investigated in 1999 and 2001. The S14–16/W25–27) and 2001 (Units S56–57/W50– source areas are located within the village proper 52, S62–64/W62–64) excavations only. and on an elevated landform positioned behind the village. The two areas contain stratified cultural Procedures and Methods of Quantification and deposits dating to the late and middle Holocene Identification periods, respectively. With an emphasis on mollusc species identifica- The primary purpose of collecting and examining tion and quantification, this preliminary analysis the Tsʼishaa shellfish remains was to sample, iden- examines discarded shellfood remains that were tify, and quantify the marine invertebrate species collected and processed by the site occupants for each major stratigraphic layer. Sets of quantita- for approximately 5,000 years. The data, when tive information were compiled through out the reviewed together with the recovered vertebrate analysis in order to accomplish these objectives.
    [Show full text]
  • Climate Change Report for Gulf of the Farallones and Cordell
    Chapter 6 Responses in Marine Habitats Sea Level Rise: Intertidal organisms will respond to sea level rise by shifting their distributions to keep pace with rising sea level. It has been suggested that all but the slowest growing organisms will be able to keep pace with rising sea level (Harley et al. 2006) but few studies have thoroughly examined this phenomenon. As in soft sediment systems, the ability of intertidal organisms to migrate will depend on available upland habitat. If these communities are adjacent to steep coastal bluffs it is unclear if they will be able to colonize this habitat. Further, increased erosion and sedimentation may impede their ability to move. Waves: Greater wave activity (see 3.3.2 Waves) suggests that intertidal and subtidal organisms may experience greater physical forces. A number of studies indicate that the strength of organisms does not always scale with their size (Denny et al. 1985; Carrington 1990; Gaylord et al. 1994; Denny and Kitzes 2005; Gaylord et al. 2008), which can lead to selective removal of larger organisms, influencing size structure and species interactions that depend on size. However, the relationship between offshore significant wave height and hydrodynamic force is not simple. Although local wave height inside the surf zone is a good predictor of wave velocity and force (Gaylord 1999, 2000), the relationship between offshore Hs and intertidal force cannot be expressed via a simple linear relationship (Helmuth and Denny 2003). In many cases (89% of sites examined), elevated offshore wave activity increased force up to a point (Hs > 2-2.5 m), after which force did not increase with wave height.
    [Show full text]
  • The Biology of Seashores - Image Bank Guide All Images and Text ©2006 Biomedia ASSOCIATES
    The Biology of Seashores - Image Bank Guide All Images And Text ©2006 BioMEDIA ASSOCIATES Shore Types Low tide, sandy beach, clam diggers. Knowing the Low tide, rocky shore, sandstone shelves ,The time and extent of low tides is important for people amount of beach exposed at low tide depends both on who collect intertidal organisms for food. the level the tide will reach, and on the gradient of the beach. Low tide, Salt Point, CA, mixed sandstone and hard Low tide, granite boulders, The geology of intertidal rock boulders. A rocky beach at low tide. Rocks in the areas varies widely. Here, vertical faces of exposure background are about 15 ft. (4 meters) high. are mixed with gentle slopes, providing much variation in rocky intertidal habitat. Split frame, showing low tide and high tide from same view, Salt Point, California. Identical views Low tide, muddy bay, Bodega Bay, California. of a rocky intertidal area at a moderate low tide (left) Bays protected from winds, currents, and waves tend and moderate high tide (right). Tidal variation between to be shallow and muddy as sediments from rivers these two times was about 9 feet (2.7 m). accumulate in the basin. The receding tide leaves mudflats. High tide, Salt Point, mixed sandstone and hard rock boulders. Same beach as previous two slides, Low tide, muddy bay. In some bays, low tides expose note the absence of exposed algae on the rocks. vast areas of mudflats. The sea may recede several kilometers from the shoreline of high tide Tides Low tide, sandy beach.
    [Show full text]
  • Urchin Rocks-NW Island Transect Study 2020
    The Long-term Effect of Trampling on Rocky Intertidal Zone Communities: A Comparison of Urchin Rocks and Northwest Island, WA. A Class Project for BIOL 475, Marine Invertebrates Rosario Beach Marine Laboratory, summer 2020 Dr. David Cowles and Class 1 ABSTRACT In the summer of 2020 the Rosario Beach Marine Laboratory Marine Invertebrates class studied the intertidal community of Urchin Rocks (UR), part of Deception Pass State Park. The intertidal zone at Urchin Rocks is mainly bedrock, is easily reached, and is a very popular place for visitors to enjoy seeing the intertidal life. Visits to the Location have become so intense that Deception Pass State Park has established a walking trail and docent guides in the area in order to minimize trampling of the marine life while still allowing visitors. No documentation exists for the state of the marine community before visits became common, but an analogous Location with similar substrate exists just offshore on Northwest Island (NWI). Using a belt transect divided into 1 m2 quadrats, the class quantified the algae, barnacle, and other invertebrate components of the communities at the two locations and compared them. Algal cover at both sites increased at lower tide levels but while the cover consisted of macroalgae at NWI, at Urchin Rocks the lower intertidal algae were dominated by diatom mats instead. Barnacles were abundant at both sites but at Urchin Rocks they were even more abundant but mostly of the smallest size classes. Small barnacles were especially abundant at Urchin Rocks near where the walking trail crosses the transect. Barnacles may be benefitting from areas cleared of macroalgae by trampling but in turn not be able to grow to large size at Urchin Rocks.
    [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]
  • Are the Traditional Medical Uses of Muricidae Molluscs Substantiated by Their Pharmacological Properties and Bioactive Compounds?
    Mar. Drugs 2015, 13, 5237-5275; doi:10.3390/md13085237 OPEN ACCESS marine drugs ISSN 1660-3397 www.mdpi.com/journal/marinedrugs Review Are the Traditional Medical Uses of Muricidae Molluscs Substantiated by Their Pharmacological Properties and Bioactive Compounds? Kirsten Benkendorff 1,*, David Rudd 2, Bijayalakshmi Devi Nongmaithem 1, Lei Liu 3, Fiona Young 4,5, Vicki Edwards 4,5, Cathy Avila 6 and Catherine A. Abbott 2,5 1 Marine Ecology Research Centre, School of Environment, Science and Engineering, Southern Cross University, G.P.O. Box 157, Lismore, NSW 2480, Australia; E-Mail: [email protected] 2 School of Biological Sciences, Flinders University, G.P.O. Box 2100, Adelaide 5001, Australia; E-Mails: [email protected] (D.R.); [email protected] (C.A.A.) 3 Southern Cross Plant Science, Southern Cross University, G.P.O. Box 157, Lismore, NSW 2480, Australia; E-Mail: [email protected] 4 Medical Biotechnology, Flinders University, G.P.O. Box 2100, Adelaide 5001, Australia; E-Mails: [email protected] (F.Y.); [email protected] (V.E.) 5 Flinders Centre for Innovation in Cancer, Flinders University, G.P.O. Box 2100, Adelaide 5001, Australia 6 School of Health Science, Southern Cross University, G.P.O. Box 157, Lismore, NSW 2480, Australia; E-Mail: [email protected] * Author to whom correspondence should be addressed; E-Mail: [email protected]; Tel.: +61-2-8201-3577. Academic Editor: Peer B. Jacobson Received: 2 July 2015 / Accepted: 7 August 2015 / Published: 18 August 2015 Abstract: Marine molluscs from the family Muricidae hold great potential for development as a source of therapeutically useful compounds.
    [Show full text]
  • Cirral Length and Wave Exposure in the Barnacle, Semibalanus Cariosus
    Cirral Length and Wave Exposure in the barnacle, Semibalanus cariosus By: Jennifer Maciejeski Introduction Barnacles are very prevalent on many coasts throughout the world's oceans. They are suspension feeders that filter food from the water column. They are attached to rocks, wood, or even living organisms in the water. During their larval stage oflife, barnacles are mobile and at this stage find a substrate to land on and spend the rest of their adult life on. They attach onto a surface with their heads and cement themselves down and then secrete the shell material to make their calcareous plates that protect their soft bodies. Since they are non-mobile for most oftheir lives as an adult, barnacles depend on water flow to bring food to them. To collect food from the water, barnacles use their feet (cirri) which are facing upward from their calcareous plates, to bring in particles (Ingram 2007). In order for the cirri to work, barnacles must have some form of water flow. An example ofa large species ofbarnacle is the thatched barnacle, Semibalanus cariosus. The thatched barnacle is found in the mid intertidal to shallow subtidal, many times underneath the thickest band ofacorn barnacles in the low intertidal. They range from Alaska to Central California on the West Coast ofthe United States as well as in some parts ofJapan. They are generally found on rocks, floats, or pilings with a high number found on steep shores with current and waves, though on the open ocean they are usually in cracks or protected areas. S. cariosus can be found often times in aggregations with other individuals, and can be tall and narrow when in large groups.
    [Show full text]
  • 2013-2015 Cherry Point Final Report
    Intertidal Biota Monitoring in the Cherry Point Aquatic Reserve 2013-2015 Monitoring Report Prepared for: Cherry Point Aquatic Reserve Citizen Stewardship Committee Prepared by: Michael Kyte Independent Marine Biologist and Wendy Steffensen and Eleanor Hines RE Sources for Sustainable Communities September 2016 Publication Information This Monitoring Report describes the research and monitoring study of intertidal biota conducted in the summers of 2013-2015 in the Cherry Point Aquatic Reserve. Copies of this Monitoring Report will be available at https://sites.google.com/a/re-sources.org/main- 2/programs/cleanwater/whatcom-and-skagit-county-aquatic-reserves. Author and Contact Information Wendy Steffensen North Sound Baykeeper, RE Sources for Sustainable Communities Eleanor Hines Lead Scientist, Clean Water Program RE Sources for Sustainable Communities 2309 Meridian Street Bellingham, WA 98225 [email protected] Michael Kyte Independent Marine Biologist [email protected] The report template was provided by Jerry Joyce for the Cherry Point and Fidalgo Bay Aquatic Reserves Citizen Stewardship Committees, and adapted here. Jerry Joyce Washington Environmental Council 1402 Third Avenue Seattle, WA 98101 206-440-8688 [email protected] i Acknowledgments Most of the sampling protocols and procedures are based on the work of the Island County/WSU Beach Watchers (currently known as the Sound Water Stewards). We thank them for the use of their materials and assistance. In particular, we thank Barbara Bennett, project coordinator for her assistance. We also thank our partners at WDNR and especially Betty Bookheim for her assistance in refining the procedures. We thank Dr. Megan Dethier of University of Washington for her assistance in helping us resolve some of the theoretical issues in the sampling protocol Surveys, data entry, quality control assistance and report writing were made possible by a vast array of interns and volunteers.
    [Show full text]
  • SPECIAL PUBLICATION 6 the Effects of Marine Debris Caused by the Great Japan Tsunami of 2011
    PICES SPECIAL PUBLICATION 6 The Effects of Marine Debris Caused by the Great Japan Tsunami of 2011 Editors: Cathryn Clarke Murray, Thomas W. Therriault, Hideaki Maki, and Nancy Wallace Authors: Stephen Ambagis, Rebecca Barnard, Alexander Bychkov, Deborah A. Carlton, James T. Carlton, Miguel Castrence, Andrew Chang, John W. Chapman, Anne Chung, Kristine Davidson, Ruth DiMaria, Jonathan B. Geller, Reva Gillman, Jan Hafner, Gayle I. Hansen, Takeaki Hanyuda, Stacey Havard, Hirofumi Hinata, Vanessa Hodes, Atsuhiko Isobe, Shin’ichiro Kako, Masafumi Kamachi, Tomoya Kataoka, Hisatsugu Kato, Hiroshi Kawai, Erica Keppel, Kristen Larson, Lauran Liggan, Sandra Lindstrom, Sherry Lippiatt, Katrina Lohan, Amy MacFadyen, Hideaki Maki, Michelle Marraffini, Nikolai Maximenko, Megan I. McCuller, Amber Meadows, Jessica A. Miller, Kirsten Moy, Cathryn Clarke Murray, Brian Neilson, Jocelyn C. Nelson, Katherine Newcomer, Michio Otani, Gregory M. Ruiz, Danielle Scriven, Brian P. Steves, Thomas W. Therriault, Brianna Tracy, Nancy C. Treneman, Nancy Wallace, and Taichi Yonezawa. Technical Editor: Rosalie Rutka Please cite this publication as: The views expressed in this volume are those of the participating scientists. Contributions were edited for Clarke Murray, C., Therriault, T.W., Maki, H., and Wallace, N. brevity, relevance, language, and style and any errors that [Eds.] 2019. The Effects of Marine Debris Caused by the were introduced were done so inadvertently. Great Japan Tsunami of 2011, PICES Special Publication 6, 278 pp. Published by: Project Designer: North Pacific Marine Science Organization (PICES) Lori Waters, Waters Biomedical Communications c/o Institute of Ocean Sciences Victoria, BC, Canada P.O. Box 6000, Sidney, BC, Canada V8L 4B2 Feedback: www.pices.int Comments on this volume are welcome and can be sent This publication is based on a report submitted to the via email to: [email protected] Ministry of the Environment, Government of Japan, in June 2017.
    [Show full text]
  • 1 Guide to Common California Intertidal Invertebrates & Algae
    MARINe Workshop – October 22-23, 2005 SWAT Team Guide to common California intertidal invertebrates & algae: distinguishing characteristics Information adapted from various sources and personal observations of the SWAT Team http://cbsurveys.ucsc.edu Anthopleura elegantissima Anthopleura sola (Brandt, 1835) (Pearse and Francis, 2000) • 6 cm diameter for aggregating • to 25 cm diameter, 51 cm high individuals, occasionally larger • up to 10 cm diameter (large solitaries Size range almost certainly A. sola, but if tentacles are touching adjacent animals that have the same disk pattern, then A. elegantissima) • column light green to white • longitudinal rows of adhesive tubercles (verrucae) that are often bearing debris Appearance tentacles of various colors, often several distinctive white, while most greenish; often pink, lavender, or blue tipped • insertions of mesentaries evident as lines radiating from around mouth Oral disk color brownish or greenish • rock faces or boulders, tidepools or • mid to low intertidal, extending well crevices, wharf pilings subtidally • usually in dense aggregations. • often attached to rocks covered with layer of Habitat sand • base nearly always inserted into crevice or holes. • tubercles round, arranged in • identical to A. elegantissima except grows to longitudinal rows and often bearing larger size and does not clone attached debris • can not distinguish two species when solitary • small to medium sized anemones, and below about 5 cm diameter-- probably commonly densely massed on rocks in best to call such individuals A. elegantissima, sand especially if there are lots present, certainly if • identical color pattern as seen in A. they have identical color patters Distinguishing sola • larger animals that are solitary with clear characteristics • can only be sure of identity if tentacles space between them and others almost interdigitate with adjacent clonemates.
    [Show full text]
  • Keystone-Species-2016-Poster.Pdf
    DISCOVERING KEYSTONE SPECIES EXPERIMENT KEYSTONE SPECIES In 1963, Robert Paine embarked on a landmark experiment at the tip This experiment demonstrated the importance of top-down of the Olympic peninsula in Washington’s Mukkaw Bay. The bay control by the predatory starfish Pisaster ochraceus on the features intertidal zones where members of a diverse community structure and composition of the community. When starfish of invertebrates compete for resources. The concept of the were removed, the diversity of the community plummeted. experiment was simple: remove all the starfish from one Because of its large effect relative to its population size, area. Paine was testing the top-down view of community Paine coined the term keystone species to describe species regulation, in which predators at the top of the pyramid that, like the starfish, have large disproportionate impacts on limit the herbivores below them and indirectly control their communities. primary producers at the base. This was contrary to the then-popular bottom-up view, in which the Removal of the starfish revealed their role in controlling availability of producers at the bottom controls species that they prey upon, which in turn had an impact on the numbers of herbivores, which in turn species the next level down in the food web. Paine named regulates predators at the top. these strong but indirect top-down effects trophic cascades. BEFORE STARFISH REMOVAL 1 YEAR AFTER REMOVAL 5 YEARS AFTER Starfish Anemone Gooseneck Gooseneck barnacle Pisaster ochraceus Anemone Sea slug barnacle Mussel Anthopleura Archidoris xanthogrammica Sea slug montereyensis Anthopleura Sea Snail xanthogrammica Mytilus californianus Pollicipes Limpets Sponge polymerus Chitons Mussel Pollicipes polymerus Archidoris Lottia pelta montereyensis Mussel Tonicella lineata Barnacles Mytilus californianus Sponge Haliclona sp.
    [Show full text]