Marine Rocky Shores and Community Ecology: an Experimentalist's Perspective
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
A Genealogical Handbook of German Research
Family History Library • 35 North West Temple Street • Salt Lake City, UT 84150-3400 USA A GENEALOGICAL HANDBOOK OF GERMAN RESEARCH REVISED EDITION 1980 By Larry O. Jensen P.O. Box 441 PLEASANT GROVE, UTAH 84062 Copyright © 1996, by Larry O. Jensen All rights reserved. No part of this work may be translated or reproduced in any form or by any means, electronic, mechanical, including photocopying, without permission in writing from the author. Printed in the U.S.A. INTRODUCTION There are many different aspects of German research that could and maybe should be covered; but it is not the intention of this book even to try to cover the majority of these. Too often when genealogical texts are written on German research, the tendency has been to generalize. Because of the historical, political, and environmental background of this country, that is one thing that should not be done. In Germany the records vary as far as types, time period, contents, and use from one kingdom to the next and even between areas within the same kingdom. In addition to the variation in record types there are also research problems concerning the use of different calendars and naming practices that also vary from area to area. Before one can successfully begin doing research in Germany there are certain things that he must know. There are certain references, problems and procedures that will affect how one does research regardless of the area in Germany where he intends to do research. The purpose of this book is to set forth those things that a person must know and do to succeed in his Germanic research, whether he is just beginning or whether he is advanced. -
Revised Essd-2020-161 (20 September 2020)
1 1 Half-hourly changes in intertidal temperature at nine wave-exposed 2 locations along the Atlantic Canadian coast: a 5.5-year study 3 Ricardo A. Scrosati, Julius A. Ellrich, Matthew J. Freeman 4 Department of Biology, St. Francis Xavier University, Antigonish, Nova Scotia B2G 2W5, Canada 5 Correspondence to: Ricardo A. Scrosati ([email protected]) 6 Abstract. Intertidal habitats are unique because they spend alternating periods of 7 submergence (at high tide) and emergence (at low tide) every day. Thus, intertidal temperature 8 is mainly driven by sea surface temperature (SST) during high tides and by air temperature 9 during low tides. Because of that, the switch from high to low tides and viceversa can determine 10 rapid changes in intertidal thermal conditions. On cold-temperate shores, which are 11 characterized by cold winters and warm summers, intertidal thermal conditions can also change 12 considerably with seasons. Despite this uniqueness, knowledge on intertidal temperature 13 dynamics is more limited than for open seas. This is especially true for wave-exposed intertidal 14 habitats, which, in addition to the unique properties described above, are also characterized by 15 wave splash being able to moderate intertidal thermal extremes during low tides. To address this 16 knowledge gap, we measured temperature every half hour during a period of 5.5 years (2014- 17 2019) at nine wave-exposed rocky intertidal locations along the Atlantic coast of Nova Scotia, 18 Canada. This data set is freely available from the figshare online repository (Scrosati and 19 Ellrich, 2020a; https://doi.org/10.6084/m9.figshare.12462065.v1). -
PROTISTS Shore and the Waves Are Large, Often the Largest of a Storm Event, and with a Long Period
(seas), and these waves can mobilize boulders. During this phase of the storm the rapid changes in current direction caused by these large, short-period waves generate high accelerative forces, and it is these forces that ultimately can move even large boulders. Traditionally, most rocky-intertidal ecological stud- ies have been conducted on rocky platforms where the substrate is composed of stable basement rock. Projec- tiles tend to be uncommon in these types of habitats, and damage from projectiles is usually light. Perhaps for this reason the role of projectiles in intertidal ecology has received little attention. Boulder-fi eld intertidal zones are as common as, if not more common than, rock plat- forms. In boulder fi elds, projectiles are abundant, and the evidence of damage due to projectiles is obvious. Here projectiles may be one of the most important defi ning physical forces in the habitat. SEE ALSO THE FOLLOWING ARTICLES Geology, Coastal / Habitat Alteration / Hydrodynamic Forces / Wave Exposure FURTHER READING Carstens. T. 1968. Wave forces on boundaries and submerged bodies. Sarsia FIGURE 6 The intertidal zone on the north side of Cape Blanco, 34: 37–60. Oregon. The large, smooth boulders are made of serpentine, while Dayton, P. K. 1971. Competition, disturbance, and community organi- the surrounding rock from which the intertidal platform is formed zation: the provision and subsequent utilization of space in a rocky is sandstone. The smooth boulders are from a source outside the intertidal community. Ecological Monographs 45: 137–159. intertidal zone and were carried into the intertidal zone by waves. Levin, S. A., and R. -
Range and Variation in Landscape Patch Dynamics: Implications for Ecosystem Management
Range and Variation in Landscape Patch Dynamics: Implications for Ecosystem Management Robert E. Keane Janice L. Garner Casey Teske Cathy Stewart Paul Hessburg Abstract—Northern Rocky Mountain landscape patterns are shaped example, the range of patch sizes on a landscape over time primarily by fire and succession, and conversely, these vegetation could be used to design the size of a prescribed fire so that it patterns influence burning patterns and plant colonization pro- is not bigger, or smaller, than what would have occurred cesses. Historical range and variability (HRV) of landscape pattern historically (Cissel and others 1999; Swetnam and others can be quantified from three sources: (1) historical chronosequences, 1999; Mladenoff and others 1993). Current landscape condi- (2) spatial series, and (3) simulated chronosequences. The last two tions could also be compared with summarized historical sources were used to compute HRV for this study. Spatial series landscape conditions to detect ecologically significant change, were characterized from aerial photographs of 10 similar land- such as that brought on by fire exclusion and timber harvest- scapes on the Bitterroot National Forest, Montana. The LANDSUM ing (Baker 1992, 1995; Cissel and others 1999; Hessburg and model was used to simulate landscape patterns for three landscapes others 1999b; Landres and others 1999). on the Flathead National Forest. Landscape metrics were computed Landscape structure and composition are usually charac- using FRAGSTATS. Results can be used (1) to describe landscape terized from the spatial distribution of patches—a term characteristics, (2) to develop baseline threshold values, and (3) to synonymous with stands or polygons. Many types of spatial design treatment guidelines for ecosystem management. -
DNA Variation and Symbiotic Associations in Phenotypically Diverse Sea Urchin Strongylocentrotus Intermedius
DNA variation and symbiotic associations in phenotypically diverse sea urchin Strongylocentrotus intermedius Evgeniy S. Balakirev*†‡, Vladimir A. Pavlyuchkov§, and Francisco J. Ayala*‡ *Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697-2525; †Institute of Marine Biology, Vladivostok 690041, Russia; and §Pacific Research Fisheries Centre (TINRO-Centre), Vladivostok, 690600 Russia Contributed by Francisco J. Ayala, August 20, 2008 (sent for review May 9, 2008) Strongylocentrotus intermedius (A. Agassiz, 1863) is an economically spines of the U form are relatively short; the length, as a rule, does important sea urchin inhabiting the northwest Pacific region of Asia. not exceed one third of the radius of the testa. The spines of the G The northern Primorye (Sea of Japan) populations of S. intermedius form are longer, reaching and frequently exceeding two thirds of the consist of two sympatric morphological forms, ‘‘usual’’ (U) and ‘‘gray’’ testa radius. The testa is significantly thicker in the U form than in (G). The two forms are significantly different in morphology and the G form. The morphological differences between the U and G preferred bathymetric distribution, the G form prevailing in deeper- forms of S. intermedius are stable and easily recognizable (Fig. 1), water settlements. We have analyzed the genetic composition of the and they are systematically reported for the northern Primorye S. intermedius forms using the nucleotide sequences of the mitochon- coast region (V.A.P., unpublished data). drial gene encoding the cytochrome c oxidase subunit I and the Little is known about the population genetics of S. intermedius; nuclear gene encoding bindin to evaluate the possibility of cryptic the available data are limited to allozyme polymorphisms (4–6). -
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. -
Natural Disturbance and Stand Development Principles for Ecological Forestry
United States Department of Agriculture Natural Disturbance and Forest Service Stand Development Principles Northern Research Station for Ecological Forestry General Technical Report NRS-19 Jerry F. Franklin Robert J. Mitchell Brian J. Palik Abstract Foresters use natural disturbances and stand development processes as models for silvicultural practices in broad conceptual ways. Incorporating an understanding of natural disturbance and stand development processes more fully into silvicultural practice is the basis for an ecological forestry approach. Such an approach must include 1) understanding the importance of biological legacies created by a tree regenerating disturbance and incorporating legacy management into harvesting prescriptions; 2) recognizing the role of stand development processes, particularly individual tree mortality, in generating structural and compositional heterogeneity in stands and implementing thinning prescriptions that enhance this heterogeneity; and 3) appreciating the role of recovery periods between disturbance events in the development of stand complexity. We label these concepts, when incorporated into a comprehensive silvicultural approach, the “three-legged stool” of ecological forestry. Our goal in this report is to review the scientific basis for the three-legged stool of ecological forestry to provide a conceptual foundation for its wide implementation. Manuscript received for publication 1 May 2007 Published by: For additional copies: USDA FOREST SERVICE USDA Forest Service 11 CAMPUS BLVD SUITE 200 Publications Distribution NEWTOWN SQUARE PA 19073-3294 359 Main Road Delaware, OH 43015-8640 November 2007 Fax: (740)368-0152 Visit our homepage at: http://www.nrs.fs.fed.us/ INTRODUCTION Foresters use natural disturbances and stand development processes as models for silvicultural practices in broad conceptual ways. -
Equilibrium Theory of Island Biogeography: a Review
Equilibrium Theory of Island Biogeography: A Review Angela D. Yu Simon A. Lei Abstract—The topography, climatic pattern, location, and origin of relationship, dispersal mechanisms and their response to islands generate unique patterns of species distribution. The equi- isolation, and species turnover. Additionally, conservation librium theory of island biogeography creates a general framework of oceanic and continental (habitat) islands is examined in in which the study of taxon distribution and broad island trends relation to minimum viable populations and areas, may be conducted. Critical components of the equilibrium theory metapopulation dynamics, and continental reserve design. include the species-area relationship, island-mainland relation- Finally, adverse anthropogenic impacts on island ecosys- ship, dispersal mechanisms, and species turnover. Because of the tems are investigated, including overexploitation of re- theoretical similarities between islands and fragmented mainland sources, habitat destruction, and introduction of exotic spe- landscapes, reserve conservation efforts have attempted to apply cies and diseases (biological invasions). Throughout this the theory of island biogeography to improve continental reserve article, theories of many researchers are re-introduced and designs, and to provide insight into metapopulation dynamics and utilized in an analytical manner. The objective of this article the SLOSS debate. However, due to extensive negative anthropo- is to review previously published data, and to reveal if any genic activities, overexploitation of resources, habitat destruction, classical and emergent theories may be brought into the as well as introduction of exotic species and associated foreign study of island biogeography and its relevance to mainland diseases (biological invasions), island conservation has recently ecosystem patterns. become a pressing issue itself. -
Patch Dynamics and Metapopulation Theory: the Case of Successional Species
Journal of Theoretical Biology (2001) 209 (3): 333-344. http://dx.doi.org/10.1006/jtbi.2001.2269 Patch Dynamics and Metapopulation Theory: The Case of Successional Species a a,b Priyanga Amarasekare and Hugh Possingham a National Center for Ecological Analysis and Synthesis, University of California, Santa Barbara, 735 State Street, Suite 300, Santa Barbara, CA, 93101-5504, U.S.A. b Departments of Zoology and Mathematics, The University of Queensland, St Lucia, QLD 4072, Australia Abstract We present a mathematical framework that combines extinction–colonization dynamics with the dynamics of patch succession. We draw an analogy between the epidemiological categorization of individuals (infected, susceptible, latent and resistant) and the patch structure of a spatially heterogeneous landscape (occupied–suitable, empty–suitable, occupied–unsuitable and empty– unsuitable). This approach allows one to consider life-history attributes that influence persistence in patchy environments (e.g., longevity, colonization ability) in concert with extrinsic processes (e.g., disturbances, succession) that lead to spatial heterogeneity in patch suitability. It also allows the incorporation of seed banks and other dormant life forms, thus broadening patch occupancy dynamics to include sink habitats. We use the model to investigate how equilibrium patch occupancy is influenced by four critical parameters: colonization rate, extinction rate, disturbance frequency and the rate of habitat succession. This analysis leads to general predictions about how the temporal scaling of patch succession and extinction–colonization dynamics influences long- term persistence. We apply the model to herbaceous, early-successional species that inhabit open patches created by periodic disturbances. We predict the minimum disturbance frequency required for viable management of such species in the Florida scrub ecosystem. -
Germany 1919-1941 U.S
U.S. MILITARY INTELLIGENCE REPORTS : GERMANY 1919-1941 U.S. MILITARY INTELLIGENCE REPORTS: GERMANY, 1919-1941 Edited by Dale Reynolds Guide Compiled by Robert Lester A Microfilm Project of UNIVERSITY PUBLICATIONS OF AMERICA, INC. 44 North Market Street • Frederick, MD 21701 Copyright© 1983 by University Publications of America, Inc. All rights reserved. ISBN 0-89093^26-6. Note on Sources The Documents in this Collection are from the National Archives and Record Service, Washington, D.C., Record Group #165. Mil- itary Intelligence Division Files: Germany. TABLE OF CONTENTS Red Index 1 Reel I 1 Reel II 6 Reel III 10 Reel IV 15 Reel V 18 Reel VI 22 Reel VII 25 Reel VIII 29 Reel IX 31 Reel X 33 Reel XI 33 Reel XII 34 Reel XIII 35 Reel XIV 38 Reel XV 39 Reel XVI 41 Reel XVII 43 Reel XVIII 45 Reel XIX 47 Reel XX 49 Reel XXI 52 Reel XXII 54 Reel XXIII 56 Reel XXIV 58 Reel XXV 61 Reel XXVI 63 Reel XXVII 65 Reel XXVIII 68 Subject Index 71 Dates to Remember February 3,1917 Severance of U.S. Diplomatic Relations with Germany; Declara- tion of War November 11,1918 Armistice December 1, 1918 U.S. Troops of the 3rd Army cross the Rhine and Occupy the Rhine Province July 2,1919 Departure of the U.S. 3rd Army; the U.S. Army of the Rhine Occupies Coblenz in the Rhine Province December 10, 1921 Presentation of Credentials of the U.S. Charge d'Affaires in Berlin April 22, 1922 Withdrawal of U.S. -
Spatial Vision in the Purple Sea Urchin Strongylocentrotus Purpuratus (Echinoidea)
249 The Journal of Experimental Biology 213, 249-255 Published by The Company of Biologists 2010 doi:10.1242/jeb.033159 Spatial vision in the purple sea urchin Strongylocentrotus purpuratus (Echinoidea) D. Yerramilli and S. Johnsen* Biology Department, Duke University, Durham, NC 27708, USA *Author for correspondence ([email protected]) Accepted 14 October 2009 SUMMARY Recent evidence that echinoids of the genus Echinometra have moderate visual acuity that appears to be mediated by their spines screening off-axis light suggests that the urchin Strongylocentrotus purpuratus, with its higher spine density, may have even more acute spatial vision. We analyzed the movements of 39 specimens of S. purpuratus after they were placed in the center of a featureless tank containing a round, black target that had an angular diameter of 6.5deg. or 10deg. (solid angles of 0.01sr and 0.024sr, respectively). An average orientation vector for each urchin was determined by testing the animal four times, with the target placed successively at bearings of 0deg., 90deg., 180deg. and 270deg. (relative to magnetic east). The urchins showed no significant unimodal or axial orientation relative to any non-target feature of the environment or relative to the changing position of the 6.5deg. target. However, the urchins were strongly axially oriented relative to the changing position of the 10deg. target (mean axis from –1 to 179deg.; 95% confidence interval ± 12deg.; P<0.001, Moore’s non-parametric Hotelling’s test), with 10 of the 20 urchins tested against that target choosing an average bearing within 10deg. of either the target center or its opposite direction (two would be expected by chance). -
Multiple Factors Explain the Covering Behaviour in the Green Sea Urchin, Strongylocentrotus Droebachiensis
ARTICLE IN PRESS ANIMAL BEHAVIOUR, 2007, --, --e-- doi:10.1016/j.anbehav.2006.11.008 Multiple factors explain the covering behaviour in the green sea urchin, Strongylocentrotus droebachiensis CLE´ MENT P. DUMONT*†,DAVIDDROLET*, ISABELLE DESCHEˆ NES* &JOHNH.HIMMELMAN* *De´partement de Biologie, Que´bec-Oce´an, Universite´ Laval yCEAZA, Departamento de Biologia Marina, Universidad Catolica del Norte (Received 26 March 2006; initial acceptance 29 August 2006; final acceptance 13 November 2006; published online ---; MS. number: A10403) Although numerous species of sea urchins often cover themselves with small rocks, shells and algal fragments, the function of this covering behaviour is poorly understood. Diving observations showed that the degree to which the sea urchin Strongylocentrotus droebachiensis covers itself in the field decreases with size. We performed laboratory experiments to examine how the sea urchin’s covering behaviour is affected by the presence of predators, sea urchin size, wave surge, contact with moving algae blades and sunlight. The presence of two common sea urchin predators did not influence the degree to which sea ur- chins covered themselves. Covering responses of sea urchins that were exposed to a strong wave surge and sweeping algal blades were significantly greater than those of individuals that were maintained under still water conditions. The degree to which sea urchins covered themselves in the laboratory also tended to decrease with increasing size. Juveniles showed stronger covering responses than adults, possibly because they are more vulnerable to dislodgement and predation. We found that UV light stimulated a covering response, whereas UV-filtered sunlight and darkness did not, although the response to UV light was much weaker than that to waves and algal movement.