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Eavesdropping on Visual Secrets
Evol Ecol DOI 10.1007/s10682-013-9656-9 REVIEW ARTICLE Eavesdropping on visual secrets Nicholas C. Brandley • Daniel I. Speiser • So¨nke Johnsen Received: 22 October 2012 / Accepted: 28 May 2013 Ó Springer Science+Business Media Dordrecht 2013 Abstract Private communication may benefit signalers by reducing the costs imposed by potential eavesdroppers such as parasites, predators, prey, or rivals. It is likely that private communication channels are influenced by the evolution of signalers, intended receivers, and potential eavesdroppers, but most studies only examine how private communication benefits signalers. Here, we address this shortcoming by examining visual private com- munication from a potential eavesdropper’s perspective. Specifically, we ask if a signaler would face fitness consequences if a potential eavesdropper could detect its signal more clearly. By integrating studies on private communication with those on the evolution of vision, we suggest that published studies find few taxon-based constraints that could keep potential eavesdroppers from detecting most hypothesized forms of visual private com- munication. However, we find that private signals may persist over evolutionary time if the benefits of detecting a particular signal do not outweigh the functional costs a potential eavesdropper would suffer from evolving the ability to detect it. We also suggest that all undetectable signals are not necessarily private signals: potential eavesdroppers may not benefit from detecting a signal if it co-occurs with signals in other more detectable sensory modalities. In future work, we suggest that researchers consider how the evolution of potential eavesdroppers’ sensory systems influences private communication. Specifically, Electronic supplementary material The online version of this article (doi:10.1007/s10682-013-9656-9) contains supplementary material, which is available to authorized users. -
Polarisation Signals
Chapter 19 Polarisation Signals Justin Marshall, Nicholas Roberts, and Thomas Cronin Abstract Humans are fascinated by the colour vision, colour signals and ‘dress codes’ of other animals as we can see colour. This property of light may be useful for increasing the contrast of objects during foraging, defence, camouflage and sexual communication. New research, largely from the last decade, now suggests that polarisation is a quality of light also used in signalling and may contain information at least as rich as colour. As many of the chapters in this book detail, polarisation in animals is often associated with navigation, habitat choice and other tasks that require large-field processing. That is, a wide area of the light field, such as the celestial hemisphere, is sampled from. Polarisation vision that recognises and extracts information from objects is most likely confined to processing through small numbers of receptors. This chapter examines the latest evidence on polarised signals from animals and their environments, including both linear and circular polarisations. Both aquatic and terrestrial examples are detailed, but with emphasis on life underwater as it is here that many recent discoveries have been made. Behaviour relative to signals is described where known, and suggestions are given as to how these signals are received and processed by the visual system. Camouflage as well as signalling in this light domain is also considered, with the inevitable conclusion for this new field that we need to know more before solid conclusions can be drawn. J. Marshall (*) Sensory Neurobiology Group, Queensland Brain Institute, University of Queensland, St Lucia, Brisbane, QLD 4072, Australia e-mail: [email protected] N. -
Circularly Polarized Reflection from the Scarab Beetle Chalcothea Smaragdina: Rsfs.Royalsocietypublishing.Org Light Scattering by a Dual Photonic Structure
Circularly polarized reflection from the scarab beetle Chalcothea smaragdina: rsfs.royalsocietypublishing.org light scattering by a dual photonic structure Luke T. McDonald1,2, Ewan D. Finlayson1, Bodo D. Wilts3 and Pete Vukusic1 Research 1Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter EX4 4QL, UK 2School of Biological, Earth and Environmental Sciences, University College Cork, North Mall Campus, Cork, Cite this article: McDonald LT, Finlayson ED, Republic of Ireland Wilts BD, Vukusic P. 2017 Circularly polarized 3Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland reflection from the scarab beetle Chalcothea LTM, 0000-0003-0896-1415; EDF, 0000-0002-0433-5313; BDW, 0000-0002-2727-7128 smaragdina: light scattering by a dual photonic structure. Interface Focus 7: 20160129. Helicoidal architectures comprising various polysaccharides, such as chitin http://dx.doi.org/10.1098/rsfs.2016.0129 and cellulose, have been reported in biological systems. In some cases, these architectures exhibit stunning optical properties analogous to ordered cholesteric liquid crystal phases. In this work, we characterize the circularly One contribution of 17 to a theme issue polarized reflectance and optical scattering from the cuticle of the beetle ‘Growth and function of complex forms in Chalcothea smaragdina (Coleoptera: Scarabaeidae: Cetoniinae) using optical biological tissue and synthetic self-assembly’. experiments, simulations and structural analysis. The selective reflection of left-handed circularly polarized light is attributed to a Bouligand-type Subject Areas: helicoidal morphology within the beetle’s exocuticle. Using electron microscopy to inform electromagnetic simulations of this anisotropic strati- biomaterials fied medium, the inextricable connection between the colour appearance of C. -
Ngoka, Thesis Final 2012
RELATIVE ABUNDANCE OF THE WILD SILKMOTH, Argema mimosae BOISDUVAL ON DIFFERENT HOST PLANTS AND HOST SELECTION BEHAVIOUR OF PARASITOIDS, AT ARABUKO SOKOKE FOREST BY Boniface M. Ngoka (M.Sc.) I84/15320/05 Department of Zoological Sciences A THESIS SUBMITTED IN FULFILMENT OF THE REQUIREMENTS FOR THE AWARD OF THE DEGREE OF DOCTOR OF PHILOSOPHY IN THE SCHOOL OF PURE AND APPLIED SCIENCES OF KENYATTA UNIVERSITY NOVEMBER, 2012 ii DECLARATION This thesis is my original work and has not been presented for a degree in any other university or any other award. Signature----------------------------------------------Date--------------------------------- SUPERVISORS We confirm that the thesis is submitted with our approval as supervisors Professor Jones M. Mueke Department of Zoological Sciences, School of Pure and Applied Sciences Kenyatta University Nairobi, Kenya Signature----------------------------------------------Date--------------------------------- Dr. Esther N. Kioko Zoology Department National Museums of Kenya Nairobi, Kenya Signature----------------------------------------------Date--------------------------------- Professor Suresh K. Raina International Center of Insect Physiology and Ecology Commercial Insects Programme Nairobi, Kenya Signature----------------------------------------------Date--------------------------------- iii DEDICATION This thesis is dedicated to my family, parents, brothers and sisters for their perseverance, love and understanding which made this task possible. iv ACKNOWLEDGEMENTS My sincere thanks are due to Prof. Suresh K. Raina, Senior icipe supervisor and Commercial Insects Programme Leader, whose contribution ranged from useful suggestions and discussions throughout the study period. My sincere appreciations are also due to Dr. Esther N. Kioko, icipe immediate supervisor who provided me with wealth of literature and made many suggestions that shaped the research methodologies. Her support and keen supervision throughout the study period gave me a lot of inspiration. I would like to thank Prof. -
Coleoptera: Melolonthidae)
Available online at www.sciencedirect.com Revista Mexicana de Biodiversidad Revista Mexicana de Biodiversidad 88 (2017) 820–823 www.ib.unam.mx/revista/ Taxonomy and systematics Description of a new Plusiotis jewel scarab species from Oaxaca, Mexico (Coleoptera: Melolonthidae) Descripción de un nuevo escarabajo gema de Plusiotis de Oaxaca, México (Coleoptera: Melolonthidae) a,∗ b Andrés Ramírez-Ponce , Daniel J. Curoe a Conacyt-Laboratorio Regional de Biodiversidad y Cultivo de Tejidos Vegetales, Instituto de Biología, UNAM, Ex Fábrica San Manuel de Morcóm s/n, San Miguel Contla, 90640 Santa Cruz Tlaxcala, Tlaxcala, Mexico b Schiller 524, Colonia Bosques de Chapultepec, Del. Miguel Hidalgo, 11580 Mexico City, Mexico Received 3 April 2017; accepted 24 July 2017 Available online 28 November 2017 Abstract Plusiotis cosijoezai sp. n. is described from the Sierra Madre del Sur, Oaxaca, in southern México. Habitus and genitalia are illustrated, and diagnostic characters are compared with the closest species, P. lacordairei Boucard. © 2017 Universidad Nacional Autónoma de México, Instituto de Biología. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Keywords: Taxonomy; Rutelini; Scarabaeoidea; New species Resumen Se describe a Plusiotis cosijoezai sp. n. de la sierra Madre del Sur, Oaxaca, al sur de México. Se ilustran el hábito y los genitales, y se presentan los caracteres diagnósticos comparándolos con la especie más similar, P. lacordairei Boucard. © 2017 Universidad Nacional Autónoma de México, Instituto de Biología. Este es un artículo Open Access bajo la licencia CC BY-NC-ND (http://creativecommons.org/licenses/by-nc-nd/4.0/). -
Notes on Actias Dubernardi (Oberthür, 1897), with Description of the Early Instars (Lepidoptera: Saturniidae)
Nachr. entomol. Ver. Apollo, N. F. 27 (/2): 9–6 (2006) 9 Notes on Actias dubernardi (Oberthür, 1897), with description of the early instars (Lepidoptera: Saturniidae) Stefan Naumann Dr. Stefan Naumann, Hochkirchstrasse 7, D-0829 Berlin, Germany; [email protected]. Abstract: An overview of the knowledge on A. dubernardi was cited in the same genus at full species rank). Packard (Oberthür, 897) is given. The early instars are described (94: 80) mentioned Euandrea alrady at subgeneric and notes on behaviour and foodplants are mentioned; the status, Bouvier (936: 253) and Testout (94: 52) in larvae have silver spots and a thoracic warning pattern. All preimaginal instars, living moths and male genitalia struc- the genus Argema Wallengren, 858, and in more recent tures are figured in colour. First records of the species from literature (e.g. Mell 950, Zhu & Wang 983, 993, 996, Myanmar are mentioned. The results of some recent phylo- Nässig 99, 994, D’Abrera 998, Morishita & Kishida genetic studies concerning the arrangement of the genera 2000, Ylla et al. 2005) it was listed as junior subjective Actias Leach in Leach & Nodder, 85, Argema Wallengren, synonym of Actias Leach in Leach & Nodder, 85. 858 and Graellsia Grote, 896 are briefly discussed. Until about 0 years ago, the species was very rare in Anmerkungen zu Actias dubernardi (Oberthür, 1897) western collections, but with further economic opening mit Beschreibung der Präimaginalstadien (Lepidoptera: of PR China more and more material from this country Saturniidae) could be obtained, and eventually also some ova were Zusammenfassung: Es wird eine Übersicht über die bishe- received directly from China. -
Annotating Historical Archives of Images
Annotating Historical Archives of Images Xiaoyue Wang Lexiang Ye Eamonn Keogh Christian Shelton Department of Computer Science and Engineering University of California Riverside Riverside, California {xwang,lexiangy,eamonn,cshelton}@cs.ucr.edu ABSTRACT Recent initiatives like the Million Book Project and Google Print Library Project have already archived several million books in digital format, and within a few years a significant fraction of world’sbooks will be online. While the majority of the data will naturally be text, there will also be tens of millions of pages of images. Many of these images will defy automation annotation for the foreseeable future, but a considerable fraction of the images may be amiable to automatic annotation by algorithms that can link the historical image with a modern contemporary, with its attendant metatags. In order to perform this linking we must have a suitable distance measure which appropriately combines the relevant features of shape, color, texture and text. However the best combination of these features will vary from application to application and even from one manuscript to another. In this work we propose a simple technique to learn the distance measure by Figure 1: A page from a scientific text published in 1849 perturbing the training set in a principled way. We show the [6]. The heavily stylized scrip is difficult to read even at utility of our ideas on archives of manuscripts containing images full resolution, however we have independently confirmed from natural history and cultural artifacts. that the three insects are (left to right) Zygaena filipendulae, Acherontia atropos and Syntomis phegea Categories and Subject Descriptors In this image the text annotations will surely defy even the state- H.3.3 [Information Search and Retrieval]: Retrieval models of-the-art handwriting recognizers [1], and humans, particularly those without experience in reading cursive script are also unlikely to be able to parse these words. -
1999, 48 Saturnlidae MUNDI: SATURNIID MOTHS of the WORLD, Part 3, by Bernard D'abrera. 1998. Published by Goecke & E
48 JOURNAL OF THE LEPIDOPTERISTS' SOCIETY JOllrnal of the Lepidopterists' Society us to identify material from New Guinea in the sciron group, which 53( I), 1999, 48 includes several species that look much alike. Prior to this we only had a key published by E.-L. Bouvier (1936, Mem. Natl. Mus, Nat. SATURN li DAE MUNDI: SATURNIID MOTHS OF THE WORLD, Part 3, by Hist. Paris, 3: 1-350), in which he called these species Neodiphthera. Bernard D'Abrera. 1998. Published by Goecke & Evers, Sport I agree with D' Abrera's interpretation of the distribution of Attacus platzweg ,5, D-7521O Keltern, Germany (email: entomology@ aurantiacus. s-direktnet,de), in association with Hill House, Melbourne & Lon As with D' Abrera's similar books on Sphingidae and butterflies, don, 171 pages, 88 color plates. Hard cover, 26 x 35 cm , dust jacket, this one is a pictorial guide to these moths, based largely on speci glossy paper, ISBN-3-931374-03-3, £148 (about U,S. $250), avail mens in The Natural History Museum in London. In an effort to able from the publisher, also in U,S, from BioQuip Products, make the coverage as complete as possible, the author has done an exceptional job of gathering missing material to be photographed. Imagine a large book with the highest quality color plates show receiving several loans and donations from Australia, Belgium, ing many of the largest and most famous Saturniidae from around France, Germany, and the United States, He has largely succeeded; the world! Imagine that this book shows males and females of all the relatively few known species are missing. -
THE EMPEROR MOTHS of EASTERN AFRICA the Purpose Of
THE EMPEROR MOTHS OF EASTERN AFRICA By E. C. G. Pinhey. (The National Museum, Bulawayo.) The purpose of this article on Emperor Moths is to introduce people, in East and Central Africa, to this spectacular family and to give them some means of identifying the species. It is unfortunate that we cannot afford colour plates. Mr. Bally has aided in the production of half-tone photo• graphs, which should help considerably in the recognition of species, if not with the same facility as with colour plates. There is, of course, available, at a price, volume XIV of Seitz' Macrole• pidoptera, which includes coloured illustrations of most of the African Emperors. In tropical countries Emperor Moths and Hawk Moths are the most popular families of the moths among amateurs, the former largely for their size and colourfulness, the latter more perhaps for their streamlined elegance and rapidity of flight. Furthermore, compared to some other families, both these groups are reasonably small in number of species and, despite their bulk, they can be incorporated in a moderately limited space if not too many examples of each species are retained. Admittedly some of the larger Emperors take up a disproportionate amount of room and it is advisable to make them overlap in the collection. If we consider, however, that the amateur is concentrating on this family to the exclusion of other moth groups, the position is not too alarming. There are somewhat over a hundred species of Emperors in East Africa. What are Emperor Moths? Some people call them Silk moths, because the caterpillars of some species spin silk cocoons. -
Coleoptera: Scarabaeidae
POPULATION ANALYSIS OF CHRYSINA WOODII (COLEOPTERA: SCARABAEIDAE) IN THE DAVIS MOUNTAINS OF WEST TEXAS A Thesis Presented to the Faculty of the College of Graduate Studies and Research Angelo State University In Partial Fulfillment of the Requirements for the Degree MASTER OF SCIENCE by TIMOTHY GLENN MADDOX August 2017 Major: Biology 1 POPULATION ANALYSIS OF CHRYSINA WOODII (COLEOPTERA: SCARABAEIDAE) IN THE DAVIS MOUNTAINS OF WEST TEXAS by TIMOTHY GLENN MADDOX APPROVED: Dr. Ned E. Strenth Dr. Ben R. Skipper Dr. Nicholas J. Negovetich Dr. Karl J. Havlak June 26, 2017 APPROVED: Dr. Susan E. Keith Dean, College of Graduate Studies and Research 2 ACKNOWLEDGEMENTS I would like to thank my graduate advisor and mentor Dr. Ned E. Strenth for encouraging me to follow my interests, as well as his moral support, and assistance in the field and lab. I would also like to thank the other members of my committee whose help has been invaluable: Dr. Ben R. Skipper for his impeccable reviewing skills as well as general problem solving and expert advice regarding Program MARK and GIS; Dr. Nicholas J. Negovetich for his statistical advice and Program MARK assistance; and lastly Dr. Karl J. Havlak who has been very flexible schedule and willingness to help wherever he was needed. I would also like to thank Texas Parks and Wildlife including, Wanda Olszewski, Nicolas Havlik, David Riskind, and Mark Lockwood for allowing me to work in the Davis Mountain State Park and providing permits. A special thanks to Kelly Bryan for his advice on finding beetles. I would also like to thank Angelo State for accepting me into graduate school and providing research scholarships and funding. -
Improving Forest Conservation and Community Livelihoods Through Income Generation from Commercial Insects in Three Kenyan Forests
CommerCial inseCts and Forest Conservation Improving Forest Conservation and Community Livelihoods through Income Generation from Commercial Insects in Three Kenyan Forests CommerCial inseCts and Forest Conservation Improving Forest Conservation and Community Livelihoods through Income Generation from Commercial Insects in Three Kenyan Forests Compiled by: Suresh K. Raina, Esther N. Kioko, Ian Gordon and Charles Nyandiga Lead Scientists: Elliud Muli, Everlyn Nguku and Esther Wang’ombe Sponsored by: UNDP/GEF and co-financed by IFAD, Netherlands Ministry of Foreign Affairs, USAID, British High Commission and Toyota Environmental Grant Facility 2009 Acknowledgements The principal authors of this report are Suresh Raina and Esther Kioko. It also draws on technical materials especially provided by Vijay Adolkar, Ken Okwae Fening, Norber Mbahin, Boniface Ngoka, Joseph Macharia, Nelly Ndung’u, Alex Munguti and Fred Barasa. The final text benefitted from Charles Nyandiga and Ian Gordon’s editorial advice and contribution. Exceptional scientific, livelihood and market research assistance on qualitative and quantitative issues has been provided by Elliud Muli, Everlyn Nguku and Esther Wang’ombe. Peer review for the study was done by Oliver Chapayama. The final editing was completed by Dolorosa Osogo and Susie Wren and typesetting and cover design by Irene Ogendo and Sospeter Makau. Thanks also for the helpful comments received from members of the stakeholders committees and advisory groups, i.e. Christopher Gakahu, Jennifer Ngige, Rose Onyango and Bernard Masiga. Thanks for the field and laboratory assistance provided by Andrew Kitheka, Anthony Maina, Beatrice Njunguna, Daniel Muia, Florence Kiilu, Gladys Mose, Jael Lumumba, James Ng’ang’a, Loise Kawira, Mary Kahinya, Newton Ngui, Regina Macharia, Stephen Amboka, Caroline Mbugua, Emily Kadambi, Joseph Kilonzo and Martin Onyango. -
Special Edition: Moths Interview with Bart Coppens, Guest Speaker at ICBES 2017
INTERNATIONAL ASSOCI ATION OF BUTTERFLY EXHIBITORS AND SUPPL IERS Volume 16 Number 3 MAI– JUNE 2017 Visit us on the web at www.iabes.org Special edition: moths Interview with Bart Coppens, guest speaker at ICBES 2017 Who are you? I’m Bart Coppens (24) from the Netherlands – a fervent breeder of moths and aspiring entomologist. In my home I breed over 50 species of moths (mainly Saturniidae) on yearly basis. My goal is to expand what started out as a hobby into something more scientific. It turns out the life cycle and biology of many Saturni- idae is poorly known or even unrecorded. By importing eggs and cocoons of rare and obscure species and breeding them in cap- tivity I am able to record undescribed larvae, host plants and the life history of several moth species – information that I publish on a scientific level. My ambition is also to gradually get into more difficult subjects such as the taxonomy, morphology and evolution and perhaps even the organic chemistry (in terms of defensive chemicals) of Saturniidae – but for now these subjects are still beyond my le- Bart with Graellsia isabella vel of comprehension, as relatively young person that has not yet completed a formal education. I’d also like to say I have a general passion for all kinds of Lepidoptera, from butterflies to the tiniest species of moths, I truly like all of them. The reason I mention Saturniidae so much is because I have invested most of my time and expertise into this particular family of Lepidoptera, simply because this order of insects is too big to study on a general scale, so I decided to specialise myself a little in the kinds of moths I find the most impressi- ve and fascinating myself – and was already the most familiar with due to my breeding hobby.