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Effective Population Size and Genetic Conservation Criteria for Bull Trout
North American Journal of Fisheries Management 21:756±764, 2001 q Copyright by the American Fisheries Society 2001 Effective Population Size and Genetic Conservation Criteria for Bull Trout B. E. RIEMAN* U.S. Department of Agriculture Forest Service, Rocky Mountain Research Station, 316 East Myrtle, Boise, Idaho 83702, USA F. W. A LLENDORF Division of Biological Sciences, University of Montana, Missoula, Montana 59812, USA Abstract.ÐEffective population size (Ne) is an important concept in the management of threatened species like bull trout Salvelinus con¯uentus. General guidelines suggest that effective population sizes of 50 or 500 are essential to minimize inbreeding effects or maintain adaptive genetic variation, respectively. Although Ne strongly depends on census population size, it also depends on demographic and life history characteristics that complicate any estimates. This is an especially dif®cult problem for species like bull trout, which have overlapping generations; biologists may monitor annual population number but lack more detailed information on demographic population structure or life history. We used a generalized, age-structured simulation model to relate Ne to adult numbers under a range of life histories and other conditions characteristic of bull trout populations. Effective population size varied strongly with the effects of the demographic and environmental variation included in our simulations. Our most realistic estimates of Ne were between about 0.5 and 1.0 times the mean number of adults spawning annually. We conclude that cautious long-term management goals for bull trout populations should include an average of at least 1,000 adults spawning each year. Where local populations are too small, managers should seek to conserve a collection of interconnected populations that is at least large enough in total to meet this minimum. -
Species Knowledge Review: Shrill Carder Bee Bombus Sylvarum in England and Wales
Species Knowledge Review: Shrill carder bee Bombus sylvarum in England and Wales Editors: Sam Page, Richard Comont, Sinead Lynch, and Vicky Wilkins. Bombus sylvarum, Nashenden Down nature reserve, Rochester (Kent Wildlife Trust) (Photo credit: Dave Watson) Executive summary This report aims to pull together current knowledge of the Shrill carder bee Bombus sylvarum in the UK. It is a working document, with a view to this information being reviewed and added when needed (current version updated Oct 2019). Special thanks to the group of experts who have reviewed and commented on earlier versions of this report. Much of the current knowledge on Bombus sylvarum builds on extensive work carried out by the Bumblebee Working Group and Hymettus in the 1990s and early 2000s. Since then, there have been a few key studies such as genetic research by Ellis et al (2006), Stuart Connop’s PhD thesis (2007), and a series of CCW surveys and reports carried out across the Welsh populations between 2000 and 2013. Distribution and abundance Records indicate that the Shrill carder bee Bombus sylvarum was historically widespread across southern England and Welsh lowland and coastal regions, with more localised records in central and northern England. The second half of the 20th Century saw a major range retraction for the species, with a mixed picture post-2000. Metapopulations of B. sylvarum are now limited to five key areas across the UK: In England these are the Thames Estuary and Somerset; in South Wales these are the Gwent Levels, Kenfig–Port Talbot, and south Pembrokeshire. The Thames Estuary and Gwent Levels populations appear to be the largest and most abundant, whereas the Somerset population exists at a very low population density, the Kenfig population is small and restricted. -
Threatened Species Status Assessment Manual
THREATENED SPECIES SCIENTIFIC COMMITTEE Established under the Environment Protection and Biodiversity Conservation Act 1999 THREATENED SPECIES STATUS ASSESSMENT MANUAL A guide to undertaking status assessments, including the preparation and submission of a status report for threatened species. Knowledge of species and their status improves continuously. Due to the large numbers of both listed and non-listed species, government resources are not generally available to carry out regular and comprehensive assessments of all listed species that are threatened or assess all non-listed species to determine their listing status. A status assessment by a group of experts, with their extensive collection of knowledge of a particular taxon or group of species could help to ensure that advice is the most current and accurate available, and provide for collective expert discussion and decisions regarding any uncertainties. The development of a status report by such groups will therefore assist in maintaining the accuracy of the list of threatened species under the EPBC Act and ensure that protection through listing is afforded to the correct species. 1. What is a status assessment? A status assessment is a assessment of the conservation status of a specific group of taxa (e.g. birds, frogs, snakes) or multiple species in a region (e.g. Sydney Basin heathland flora) that occur within Australia. For each species or subspecies (referred to as a species in this paper) assessed in a status assessment the aim is to: provide an evidence-based assessment -
RSPB CENTRE for CONSERVATION SCIENCE RSPB CENTRE for CONSERVATION SCIENCE Where Science Comes to Life
RSPB CENTRE FOR CONSERVATION SCIENCE RSPB CENTRE FOR CONSERVATION SCIENCE Where science comes to life Contents Knowing 2 Introducing the RSPB Centre for Conservation Science and an explanation of how and why the RSPB does science. A decade of science at the RSPB 9 A selection of ten case studies of great science from the RSPB over the last decade: 01 Species monitoring and the State of Nature 02 Farmland biodiversity and wildlife-friendly farming schemes 03 Conservation science in the uplands 04 Pinewood ecology and management 05 Predation and lowland breeding wading birds 06 Persecution of raptors 07 Seabird tracking 08 Saving the critically endangered sociable lapwing 09 Saving South Asia's vultures from extinction 10 RSPB science supports global site-based conservation Spotlight on our experts 51 Meet some of the team and find out what it is like to be a conservation scientist at the RSPB. Funding and partnerships 63 List of funders, partners and PhD students whom we have worked with over the last decade. Chris Gomersall (rspb-images.com) Conservation rooted in know ledge Introduction from Dr David W. Gibbons Welcome to the RSPB Centre for Conservation The Centre does not have a single, physical Head of RSPB Centre for Conservation Science Science. This new initiative, launched in location. Our scientists will continue to work from February 2014, will showcase, promote and a range of RSPB’s addresses, be that at our UK build the RSPB’s scientific programme, helping HQ in Sandy, at RSPB Scotland’s HQ in Edinburgh, us to discover solutions to 21st century or at a range of other addresses in the UK and conservation problems. -
Natura 2000 and Forests
Technical Report - 2015 - 089 ©Peter Loeffler Natura 2000 and Forests Part III – Case studies Environment Europe Direct is a service to help you find answers to your questions about the European Union New freephone number: 00 800 6 7 8 9 10 11 A great deal of additional information on the European Union is available on the Internet. It can be accessed through the Europa server (http://ec.europa.eu). Luxembourg: Office for Official Publications of the European Communities, 2015 ISBN 978-92-79-49397-3 doi: 10.2779/65827 © European Union, 2015 Reproduction is authorised provided the source is acknowledged. Disclaimer This document is for information purposes only. It in no way creates any obligation for the Member States or project developers. The definitive interpretation of Union law is the sole prerogative of the Court of Justice of the EU. Cover Photo: Peter Löffler This document was prepared by François Kremer and Joseph Van der Stegen (DG ENV, Nature Unit) and Maria Gafo Gomez-Zamalloa and Tamas Szedlak (DG AGRI, Environment, forestry and climate change Unit) with the assistance of an ad-hoc working group on Natura 2000 and Forests composed by representatives from national nature conservation and forest authorities, scientific institutes and stakeholder organisations and of the N2K GROUP under contract to the European Commission, in particular Concha Olmeda, Carlos Ibero and David García (Atecma S.L) and Kerstin Sundseth (Ecosystems LTD). Natura 2000 and Forests Part III – Case studies Good practice experiences and examples from different Member States in managing forests in Natura 2000 1. Setting conservation objectives for Natura 2000. -
Saving Seeds: Optimally Planning Our Ex Situ Conservation Collections to Ensure Species' Evolutionary Potential1
Gene Conservation of Tree Species—Banking on the Future Saving Seeds: Optimally Planning Our Ex Situ Conservation Collections to Ensure Species' 1 Evolutionary Potential Sean M. Hoban2,3 In the face of ongoing environmental change, conservation and natural resource agencies are initiating or expanding ex situ seed collections from natural plant populations. Seed collections have many uses, including in provenance trials, breeding programs, seed orchards, gene banks for long-term conservation (live plants or seeds), restoration, reforestation, and scientific study of plant germination or other plant ecology studies. Well-known examples of ex situ collections include the Millennium Seed Bank Partnership, Australian Seed Bank Partnership, United Kingdom National Tree Seed Program, United States National Plant Germplasm System, and South African Regional Seed Bank. Some collections focus on rare species, species with relevance to agriculture or forestry, or regional flora. Other collections are in response to immediate threats, such as damaging insects and pathogens (e.g., emerald ash borer). In this talk I will discuss how to sample seeds to most optimally conserve the evolutionary potential of a species to ensure its long-term survival. A useful seed collection captures as much phenotypic and genetic diversity from natural populations as possible. Choices for a collector include how many populations, maternal plants, and seeds per plant to collect. A collector wishes to achieve efficiency—to not waste limited time, resources, personnel, and storage space, but also to achieve effectiveness—to be as complete as possible in case important genetic variants are lost from natural populations. In a series of papers starting in 1975, Brown and Marshall (1975) proposed some solutions to this general sampling problem. -
Can Darwin's Finches and Their Native Ectoparasites Survive the Control of Th
Insect Conservation and Diversity (2017) 10, 193–199 doi: 10.1111/icad.12219 FORUM & POLICY Coextinction dilemma in the Galapagos Islands: Can Darwin’s finches and their native ectoparasites survive the control of the introduced fly Philornis downsi? 1 2 MARIANA BULGARELLA and RICARDO L. PALMA 1School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand and 2Museum of New Zealand Te Papa Tongarewa, Wellington, New Zealand Abstract. 1. The survival of parasites is threatened directly by environmental alter- ation and indirectly by all the threats acting upon their hosts, facing coextinction. 2. The fate of Darwin’s finches and their native ectoparasites in the Galapagos Islands is uncertain because of an introduced avian parasitic fly, Philornis downsi, which could potentially drive them to extinction. 3. We documented all known native ectoparasites of Darwin’s finches. Thir- teen species have been found: nine feather mites, three feather lice and one nest mite. No ticks or fleas have been recorded from them yet. 4. Management options being considered to control P. downsi include the use of the insecticide permethrin in bird nests which would not only kill the invasive fly larvae but the birds’ native ectoparasites too. 5. Parasites should be targeted for conservation in a manner equal to that of their hosts. We recommend steps to consider if permethrin-treated cotton sta- tions are to be deployed in the Galapagos archipelago to manage P. downsi. Key words. Chewing lice, coextinction, Darwin’s finches, dilemma, ectoparasites, feather mites, Galapagos Islands, permethrin, Philornis downsi. Introduction species have closely associated species which are also endangered (Dunn et al., 2009). -
Genetic Applications in Avian Conservation
University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln USGS Staff -- Published Research US Geological Survey 2011 Genetic Applications in Avian Conservation Susan M. Haig U.S. Geological Survey, [email protected] Whitcomb M. Bronaugh Oregon State University Rachel S. Crowhurst Oregon State University Jesse D'Elia U.S. Fish and Wildlife Service Collin A. Eagles-Smith U.S. Geological Survey See next page for additional authors Follow this and additional works at: https://digitalcommons.unl.edu/usgsstaffpub Haig, Susan M.; Bronaugh, Whitcomb M.; Crowhurst, Rachel S.; D'Elia, Jesse; Eagles-Smith, Collin A.; Epps, Clinton W.; Knaus, Brian; Miller, Mark P.; Moses, Michael L.; Oyler-McCance, Sara; Robinson, W. Douglas; and Sidlauskas, Brian, "Genetic Applications in Avian Conservation" (2011). USGS Staff -- Published Research. 668. https://digitalcommons.unl.edu/usgsstaffpub/668 This Article is brought to you for free and open access by the US Geological Survey at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in USGS Staff -- Published Research by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Authors Susan M. Haig, Whitcomb M. Bronaugh, Rachel S. Crowhurst, Jesse D'Elia, Collin A. Eagles-Smith, Clinton W. Epps, Brian Knaus, Mark P. Miller, Michael L. Moses, Sara Oyler-McCance, W. Douglas Robinson, and Brian Sidlauskas This article is available at DigitalCommons@University of Nebraska - Lincoln: https://digitalcommons.unl.edu/ usgsstaffpub/668 The Auk 128(2):205–229, 2011 The American Ornithologists’ Union, 2011. Printed in USA. SPECIAL REVIEWS IN ORNITHOLOGY GENETIC APPLICATIONS IN AVIAN CONSERVATION SUSAN M. HAIG,1,6 WHITCOMB M. BRONAUGH,2 RACHEL S. -
Buglife Ditches Report Vol1
The ecological status of ditch systems An investigation into the current status of the aquatic invertebrate and plant communities of grazing marsh ditch systems in England and Wales Technical Report Volume 1 Summary of methods and major findings C.M. Drake N.F Stewart M.A. Palmer V.L. Kindemba September 2010 Buglife – The Invertebrate Conservation Trust 1 Little whirlpool ram’s-horn snail ( Anisus vorticulus ) © Roger Key This report should be cited as: Drake, C.M, Stewart, N.F., Palmer, M.A. & Kindemba, V. L. (2010) The ecological status of ditch systems: an investigation into the current status of the aquatic invertebrate and plant communities of grazing marsh ditch systems in England and Wales. Technical Report. Buglife – The Invertebrate Conservation Trust, Peterborough. ISBN: 1-904878-98-8 2 Contents Volume 1 Acknowledgements 5 Executive summary 6 1 Introduction 8 1.1 The national context 8 1.2 Previous relevant studies 8 1.3 The core project 9 1.4 Companion projects 10 2 Overview of methods 12 2.1 Site selection 12 2.2 Survey coverage 14 2.3 Field survey methods 17 2.4 Data storage 17 2.5 Classification and evaluation techniques 19 2.6 Repeat sampling of ditches in Somerset 19 2.7 Investigation of change over time 20 3 Botanical classification of ditches 21 3.1 Methods 21 3.2 Results 22 3.3 Explanatory environmental variables and vegetation characteristics 26 3.4 Comparison with previous ditch vegetation classifications 30 3.5 Affinities with the National Vegetation Classification 32 Botanical classification of ditches: key points -
Bumblebee Conservator
Volume 2, Issue 1: First Half 2014 Bumblebee Conservator Newsletter of the BumbleBee Specialist Group In this issue From the Chair From the Chair 1 A very happy and productive 2014 to everyone! We start this year having seen From the Editor 1 enormously encouraging progress in 2013. Our different regions have started from BBSG Executive Committee 2 very different positions, in terms of established knowledge of their bee faunas Regional Coordinators 2 as well as in terms of resources available, but members in all regions are actively moving forward. In Europe and North America, which have been fortunate to Bumblebee Specialist have the most specialists over the last century, we are achieving the first species Group Report 2013 3 assessments. Mesoamerica and South America are also very close, despite the huge Bumblebees in the News 9 areas to survey and the much less well known species. In Asia, with far more species, many of them poorly known, remarkably rapid progress is being made in sorting Research 13 out what is present and in building the crucial keys and distribution maps. In some Conservation News 20 regions there are very few people to tackle the task, sometimes in situations that Bibliography 21 make progress challenging and slow – their enthusiasm is especially appreciated! At this stage, broad discussion of problems and of the solutions developed from your experience will be especially important. This will direct the best assessments for focusing the future of bumblebee conservation. From the Editor Welcome to the second issue of the Bumblebee Conservator, the official newsletter of the Bumblebee Specialist Group. -
Reviewing the Consequences of Genetic Purging on the Success of Rescue 3 Programs
bioRxiv preprint doi: https://doi.org/10.1101/2021.07.15.452459; this version posted July 15, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 Authors: Noelia Pérez-Pereiraa, Armando Caballeroa and Aurora García-Doradob 2 Article title: Reviewing the consequences of genetic purging on the success of rescue 3 programs 4 5 6 a Centro de Investigación Mariña, Universidade de Vigo, Facultade de Bioloxía, 36310 Vigo, 7 Spain. 8 9 b Departamento de Genética, Fisiología y Microbiología, Universidad Complutense, Facultad 10 de Biología, 28040 Madrid, Spain. 11 12 13 Corresponding author: Aurora García-Dorado. Departamento de Genética, Fisiología y 14 Microbiología, Universidad Complutense, Facultad de Biología, 28040 Madrid, Spain. 15 Email address: [email protected] 16 17 ORCID CODES: 18 Noelia Pérez-Pereira: 0000-0002-4731-3712 19 Armando Caballero: 0000-0001-7391-6974 20 Aurora García-Dorado: 0000-0003-1253-2787 21 22 23 24 25 26 27 28 29 30 1 bioRxiv preprint doi: https://doi.org/10.1101/2021.07.15.452459; this version posted July 15, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 31 DECLARATIONS: 32 Funding: This work was funded by Agencia Estatal de Investigación (AEI) (PGC2018- 33 095810-B-I00 and PID2020-114426GB-C21), Xunta de Galicia (GRC, ED431C 2020-05) 34 and Centro singular de investigación de Galicia accreditation 2019-2022, and the European 35 Union (European Regional Development Fund - ERDF), Fondos Feder “Unha maneira de 36 facer Europa”. -
Inbreeding Depression in Conservation Biology
P1: FOF September 25, 2000 9:54 Annual Reviews AR113-07 Annu. Rev. Ecol. Syst. 2000. 31:139–62 Copyright c 2000 by Annual Reviews. All rights reserved INBREEDING DEPRESSION IN CONSERVATION BIOLOGY Philip W. Hedrick Department of Biology, Arizona State University, Tempe, Arizona 85287; email: [email protected] Steven T. Kalinowski Conservation Biology Division, National Marine Fisheries Service, 2725 Montlake Blvd. East, Seattle, Washington 98112; email: [email protected] Key Words endangered species, extinction, fitness, genetic restoration, purging ■ Abstract Inbreeding depression is of major concern in the management and con- servation of endangered species. Inbreeding appears universally to reduce fitness, but its magnitude and specific effects are highly variable because they depend on the genetic constitution of the species or populations and on how these genotypes interact with the environment. Recent natural experiments are consistent with greater inbreeding depression in more stressful environments. In small populations of randomly mating individuals, such as are characteristic of many endangered species, all individuals may suffer from inbreeding depression because of the cumulative effects of genetic drift that decrease the fitness of all individuals in the population. In three recent cases, intro- ductions into populations with low fitness appeared to restore fitness to levels similar to those before the effects of genetic drift. Inbreeding depression may potentially be reduced, or purged, by breeding related individuals. However, the Speke’s gazelle example, often cited as a demonstration of reduction of inbreeding depression, appears to be the result of a temporal change in fitness in inbred individuals and not a reduction in inbreeding depression.