Yellow-Eyed Penguin (Megadyptes Anfipodes) Picture of Bird

Total Page:16

File Type:pdf, Size:1020Kb

Yellow-Eyed Penguin (Megadyptes Anfipodes) Picture of Bird Yellow-eyed penguin (Megadyptes anpodes) Picture of bird Full life history info: h6p://nzbirdsonline.org.nz/species/yellow-eyed-penguin Introduc@on Ecology and life history The yellow-eyed penguin (YEP) is endemic to New Normal adult weight range: Zealand and is the largest species of penguin that 5-6kg but get to 7-8kg pre-moult breeds on the mainland. Breeding colonies are found Moult: Synchronous moult i.e. moults all feathers at the on the southwest coast of the South Island as well as same Fme. In April for a 3-4 week duraon. the subantarcFc on Auckland and Campbell Islands. During this period YEPs stay on land and do not go The mainland and subantarcc populaFons are swimming to forage for food. geneFcally disFnct. Breeding: August to April. There are approximately 1700 breeding pairs and Monogamous. the species is considered naonally vulnerable. Egg laying between September to October. Chicks are suscepFble to predaon by introduced Two eggs laid over 2-3 days predators such dogs, cats, ferrets and stoats. Incubaon 39-51 days. There is a great deal of inter-annual variaon in Age at fledging 98-120 days. breeding success which is thought to be due to Age at first breeding 2.6 years. variaons in food supply. Lifespan: 20+ years Disease in an important threat to the mainland Diet: Fish and squid populaon. Outbreaks of diphtheriFc stomaFs or Conserva@on status (NZ Threat Classifica@on): bill deformiFes in growing chicks occur intermi6ently Naonally vulnerable but no specific causave agents have been idenFfied. Personal protecve equipment (PPE): Appropriate PPE must be worn when capturing and handling oiled wildlife to prevent exposure to oil (disposable nitrile gloves, safety glasses/goggles, protecFon for clothing e.g. Tyvec suit). Old towels or blue inconFnence pads are useful to handle oiled birds as they can be discarded once soiled. Capture Handling Consider the safety of both humans and Wear normal examinaon gloves if not oiled to birds. prevent feather damage. Wrap the body in a YEPs can be caught in a net or by hand towel to restrain their strong flippers and with or without a towel. Long-handled prevent feather damage. Cover the head with fishing nets are useful for capture if the the towel to reduce stress. bird is in the water. If the bird is on land Penguin bills are sharp and easily cut through then ensure that someone is standing skin. Restrain the head by holding the back of between the bird and the water to the head in the palm of one hand and gripping prevent them from entering it. the bo6om of the jaws with thumb and fingers. Transport to WARNING – NEVER place your eyes close to holes in transport boxes. facility Herons, gannets & cormorants will lunge at eyes causing serious injury or blindness. Transport box: Made of plasFc (NOT wood) as oil contaminaon can be cleaned and the box reused. Best opFon is an PetPak carrier: XXL Model No. PP60, 74(H) x 62(W) x 95(L)cm. YEP must be able to stand up or lie flat inside cage (average YEP height approx 65cm) Only ONE bird per box. Flooring: Correct flooring in the transport box is important. It should (i) be sod and non-abrasive in order to prevent development of bumblefoot during transport, (ii) be non-slip so that the bird can steady itself and (iii) prevent build up of faecal maer that can cause urate burns. Blue-tube rubber mang covered with blue inconFnence pads or a suspended neng floor are the best opFons. Folded newspaper is inappropriate as it becomes too slippery when contaminated by faeces. Shredded paper, straw, hay and seagrass should be avoided as it increases the risk of Aspergillosis Vehicle transport: van or ute, with canopy and a separate air space from people to prevent inhalaon of oil fumes. Ideally temperature controlled (heang on cold days, cooling on hot days). Yellow-eyed penguin HUSBANDRY REQUIREMENTS Housing Keep indoors and temperature controlled at 25-27°C because oiled animals cannot thermoregulate. pre-cleaning Enclosure (oiled) • Keep in temperature controlled rooms. YEPs are too large to be kept in standard hospital cages. • If room is very large then build temporary enclosures. Ensure walls of temporary enclosure are made of materials that can easily be cleaned of oil such as plasFc or metal, not wood. Examples of suitable walls include temporary metal fencing lined with shade cloth (to prevent feather damage) or plasFc traffic barriers without holes. Ensure metal fencing is not galvanised with zinc or lead as this could lead to heavy metal poisoning if the birds chew on the fence. • MulFple birds can be housed together. Do not overcrowd. • Reduce visibility of humans and noise to minimise stress. Flooring Avoid oil coming into contact with a concrete floor as it is very difficult to clean. Line floor with heavy duty plasFc sheets (e.g. pond liner or large garbage bags) then place blue tube mang on top (available at hardware stores). Correct flooring is very important to prevent uric acid and faecal buildup which can cause feather damage and bumblefoot. Covering Cover over the enclosure is not required. Housing Enclosure post-cleaning Outdoor aviary with shade cloth covering the roof and walls. Can house mulFple birds together but do not overcrowd. (NOT oiled) Flooring: Blue tube mang on floor to prevent uric acid and faecal buildup and bumblefoot. NOTE: grey tube flooring is harder than the blue version which increases risk of bumblefoot. Burrows Large hides made of plasFc - upturned plasFc box with arch cut out. Protect the sharp edge of doorway with a hose-pipe split lengthways and taped in place. Provide one hide per bird. Pool Penguins in the rehabilitaon phase need access to water in their enclosure to aid waterproofing. • Suitable pool types: built-in, large plasFc containers or plasFc (non-inflatable) child’s pool. • Non-slip ramps to allow easy access and exit of water. • Preferably use seawater, but freshwater can be used. If using freshwater then provide birds with a salt supplement in order to maintain salt glands (see “Supplements” secFon). • No need to heat the pool water. YEPs are large, robust and come from a cold water climate. • ConFnuous flow of water is required to prevent buildup of fish oil and faeces on the surface of the water which inhibits the waterproofing process. This is most easily achieved by placing a hose above the pool allowing the running water to break the surface of the pool water and leng it overflow. Good drainage around the pool is required. • Surface skimmer is useful for removing oil, food and faeces floang on the surface. Transport As per handling instrucFons. within facility If oiled, then encase in disposable material such as blue inconFnence pads. If clean, then encase in large towel. Must wear gloves to prevent feather damage. Cover head to reduce visual sFmuli and stress. IdenFficaon Leg band or flipper band (temporary idenFficaon to be removed before release) Yellow-eyed penguin NUTRITION, SUPPLEMENTS and FLUIDS At admission Triage assessment: physical examinaon by trained personnel (preferably a veterinarian) Record cloacal temperature. Give fluids at ini,al stabilisa,on rates below. Dosing If large numbers of birds require dosing then calculate dose based on the weight of the heaviest bird. Group animals into similar age and/or size class for dosing calculaons. Fluid rate IniFal stabilisaon: 80-100ml/kg body weight/day divided into two doses PO Once hydrated: 60ml/kg body weight/day divided into two doses PO Fluid type For long term maintenance use either isotonic saline (0.9%) or Vytrate®/Lectade® Amount Feed 10% of body weight (BW) TWICE a day. (i.e. 20% of body weight total each day) Food type If weak, emaciated and dehydrated: Give oral electrolyte fluids at ‘iniFal stabilisaon’ rate listed above for 24 hours to rehydrate gut. use either: Equal parts (50:50) Hartmann’s soluFon and 2.5% dextrose in 0.45% saline 5% dextrose in 0.9% saline or Vytrate®/Lectade® Once gut is hydrated, then start with small amounts of fish slurry. If able to take solids: human grade small to medium whole salmon. Food Fish slurry: Place human grade salmon in heavy duty blender and blend. Add just enough isotonic preparaon (0.9% NaCl) fluid to blender to achieve a smooth consistency. Sieve slurry using a metal sieve to remove any chunks that may clog the feeding tube. Discard aer 24 in the refrigerator. Whole fish: : Ideally defrost covered in refrigerator to retain nutriFonal quality. However, if large amounts of food are required then fish can be defrosted under cold running water immediately before feeding so long as vitamin supplements are given. Supplements ① Mazuri seabird vitamins: 1 tablet per 225g fish. (Available at Carlyle Vet Clinic, Napier 06 835 1096). ② Itraconazole (Sporonox): 5mg/kg BW PO once daily via sod crop tube to prevent Aspergillosis. ③ Salt (sodium chloride) to recondiFon salt gland: Only required if birds have been housed long- term in freshwater. Start at least 2 week before release. Give orally either as 3% saline soluFon at maintenance fluid rates or 100mg/kg BW PO once daily. Gradually increase dose over four days: Day 1 give ¼ dose, Day 2 give ½ dose, Day give ¾ dose, Day 4 give full dose, then conFnue at full dose. Delivery & Warm fluids and slurry to 38-40°C. device Large volumes of fluid and fish slurry are easier to deliver with a large, plasFc, lamb stomach tube 16” in length (pictured) and 60ml catheter-Fp syringe. Force feed (FF) whole fish head first. Some birds will learn to take fish by hand, others will need the head restrained and bill opened to place fish into the back of the mouth.
Recommended publications
  • Genomic Characterisation of a Novel Avipoxvirus Isolated from an Endangered Yellow-Eyed Penguin (Megadyptes Antipodes)
    viruses Article Genomic Characterisation of a Novel Avipoxvirus Isolated from an Endangered Yellow-Eyed Penguin (Megadyptes antipodes) Subir Sarker 1,* , Ajani Athukorala 1, Timothy R. Bowden 2,† and David B. Boyle 2 1 Department of Physiology, Anatomy and Microbiology, School of Life Sciences, La Trobe University, Melbourne, VIC 3086, Australia; [email protected] 2 CSIRO Livestock Industries, Australian Animal Health Laboratory, Geelong, VIC 3220, Australia; [email protected] (T.R.B.); [email protected] (D.B.B.) * Correspondence: [email protected]; Tel.: +61-3-9479-2317; Fax: +61-3-9479-1222 † Present address: CSIRO Australian Animal Health Laboratory, Australian Centre for Disease Preparedness, Geelong, VIC 3220, Australia. Abstract: Emerging viral diseases have become a significant concern due to their potential con- sequences for animal and environmental health. Over the past few decades, it has become clear that viruses emerging in wildlife may pose a major threat to vulnerable or endangered species. Diphtheritic stomatitis, likely to be caused by an avipoxvirus, has been recognised as a signifi- cant cause of mortality for the endangered yellow-eyed penguin (Megadyptes antipodes) in New Zealand. However, the avipoxvirus that infects yellow-eyed penguins has remained uncharacterised. Here, we report the complete genome of a novel avipoxvirus, penguinpox virus 2 (PEPV2), which was derived from a virus isolate obtained from a skin lesion of a yellow-eyed penguin. The PEPV2 genome is 349.8 kbp in length and contains 327 predicted genes; five of these genes were found to be unique, while a further two genes were absent compared to shearwaterpox virus 2 (SWPV2).
    [Show full text]
  • Declining Eastern Rockhopper (Eudyptes Filholi) and Erect-Crested (E
    124 AvailableNew on-lineZealand at: Journal http://www.newzealandecology.org/nzje/ of Ecology, Vol. 38, No. 1, 2014 Declining eastern rockhopper (Eudyptes filholi) and erect-crested (E. sclateri) penguins on the Antipodes Islands, New Zealand Johanna A. Hiscock1 and B. Louise Chilvers2* 1Southern Islands, Department of Conservation, PO Box 743, Invercargill, New Zealand 2Marine Species and Threats, Department of Conservation, PO Box 10 420, Wellington, New Zealand *Author for correspondence (Email: [email protected]) Published online: 7 November 2013 Abstract: New Zealand’s subantarctic Antipodes Islands are of international significance for breeding seabirds. However, penguin populations on the islands are declining. Uncertainty about the extent of this decline has been accentuated by a lack of accurate information on the population size and nest distribution of the penguin species, and the absence of an appropriate methodology for their long-term monitoring. We surveyed the nest abundance and distribution of eastern rockhopper penguins (Eudyptes filholi) and erect-crested penguins (E. sclateri) on the Antipodes Islands from 22 October to 6 November 2011 and compared counts with historical censuses from 1978 to 1995. Presence or absence of colonies previously known to have existed was recorded and counts of all nests within colonies around the islands were undertaken. In total, 42 689 nests of both species were counted over 103 colonies. Of these, 86% of nests (2475 rockhopper and 34 226 erect-crested) were counted accurately from on land. Overall, 24 entire colonies have ceased to exist since 1978, and there was an estimated 23% decline in the number of penguin nests between 1995 and 2011.
    [Show full text]
  • Behavior and Nesting Success Relative to Nest Location in Adslie Penguins (Pygoscelis Adeliae)
    BEHAVIOR AND NESTING SUCCESS RELATIVE TO NEST LOCATION IN ADSLIE PENGUINS (PYGOSCELIS ADELIAE) RICHARD TENAZAl Department of Zoology University of Wisconsin Madison, Wisconsin This study is an experimental evaluation of the predictions for three reasons: (1) it is much hypothesis that differences in nest positions less disturbed in the presence of man than within and outside Ad&e Penguin colonies are most colonial sea birds, (2) it is subject influence behavior, egg loss rates, and nest to predation upon eggs and chicks, and (3) characteristics. “Colony” and “rookery” are theft of nest material from neighbors is con- used in this report as defined for Ad&lies by spicuous and frequent. Also, the breeding Penney (X365:85): “A colony is a geograph- behavior and ecology of the Ad&lie is the ically continuous group of breeding birds best known of the Antarctic penguins. whose territorial boundaries are contiguous,” and a rookery is a “geographical area . that METHODS contains one or more colonies.” The study was conducted at Cape Hallet (72” 18 ’ 50” The actions of predators and conspecifics S, 170” 13 ’ 00” E ), Victoria Land, Antarctica, during within a dense nesting colony of Ad&es or the 1967-1968 austral summer. The Cape Hallet other sea birds are highly predictable. Nests Ad&e Penguin rookery occupies about 40 ha of a are regularly spaced, just far enough apart to low lying spit (“Seabee Spit”), approximately 1000 m long and 200-650 m wide, projecting into the Moubray allow owners of adjacent territories to touch Bay inlet of the Ross Sea (fig.
    [Show full text]
  • Birds of the Snares Islands, New Zealand
    Notornis, 2001, Vol. 48: 1-40 0029-4470 0 The Ornithological Society of New Zealand, Inc. 2001 Birds of the Snares Islands, New Zealand COLIN M. MISKELLY Department of Zoology, University of Canterbury, Private Bag 4800, Christchurch, New Zealand Current address: Wellington Conservancy, Department of Conservation, PO. Box 5086, Wellington, New Zealand [email protected] PAUL M. SAGAR National Institute of Water &Atmospheric Research, PO. Box 8602, Christchurch ALAN J.D. TENNYSON Museum of New Zealand Te Papa Tongarewa, PO. Box 467, Wellington R. PAUL SCOFIELD Department of Zoology, University of Otago, PO. Box 56, Dunedin Abstract Bird records from the Snares Islands between Dec 1982 and Oct 2000 are summarised. Population estimates and distributions are given for the 29 breeding species. Bird species recorded breeding on the Snares Is for the first time since 1982 were southern black-browed albatross (Diomedea melanophtys), Chatham Island albatross (D. eremita), mallard (Anasplatyrhynchos), southern black-backed gull (Larus dominicanus), fantail (Rhipidura Juliginosa), and starling (Sturnus vulyaris). Fantails are now abundant on the Snares Is. Published work on the breeding chronology and breeding success of 8 intensively studied species is summarised, and new information on breeding ecology is presented for all breeding species. Sighting of 70 non-breeding and vagrant species are summarised;34 of these were new records from the Snares Is since 1980. The total bird list for the Snares Is is now 99 species, with a further 8 species reported from boats offshore. Miskelly, C.M.; Sagar, EM.; Tennyson, A.J.D;Scofield, R.l? 2001. Birds of the Snares Islands, New Zealand.Notornis 48(1): 1-40.
    [Show full text]
  • Endangered Species Research 39:293
    Vol. 39: 293–302, 2019 ENDANGERED SPECIES RESEARCH Published August 22 https://doi.org/10.3354/esr00970 Endang Species Res OPENPEN ACCESSCCESS Sexual and geographic dimorphism in northern rockhopper penguins breeding in the South Atlantic Ocean Antje Steinfurth1,2,*,**, Jenny M. Booth3,**, Jeff White4, Alexander L. Bond5,6, Christopher D. McQuaid3 1FitzPatrick Institute of African Ornithology, DST/NRF Centre of Excellence, University of Cape Town, Rondebosch 7700, South Africa 2RSPB Centre for Conservation Science, Royal Society for the Protection of Birds, David Attenborough Building, Cambridge, Cambridgeshire CB2 3QZ, UK 3Coastal Research Group, Department of Zoology and Entomology, Rhodes University, PO Box 94, Grahamstown 6140, South Africa 4Marshall University, Huntington, WV 25755, USA 5RSPB Centre for Conservation Science, Royal Society for the Protection of Birds, The Lodge, Sandy, Bedfordshire SG19 2DL, UK 6Bird Group, Department of Life Sciences, The Natural History Museum, Tring, Hertfordshire HP23 6AP, UK ABSTRACT: The Endangered northern rockhopper penguin Eudyptes moseleyi, like all pen- guins, is monomorphic, making sex determination of individuals in the field challenging. We examined the degree of sexual size dimorphism of adult birds across the species’ breeding range in the Atlantic Ocean and developed discriminant functions (DF) to predict individuals’ sex using morphometric measurements. We found significant site-specific differences in both bill length and bill depth, with males being the larger sex on each island. Across all islands, bill length contri - buted 78% to dissimilarity between sexes. Penguins on Gough Island had significantly longer bills, whilst those from Tristan da Cunha had the deepest. Island-specific DFs correctly classified 82−94% of individuals, and all functions performed significantly better than chance.
    [Show full text]
  • Department of the Interior Fish and Wildlife Service
    Thursday, December 18, 2008 Part III Department of the Interior Fish and Wildlife Service 50 CFR Part 17 Endangered and Threatened Wildlife and Plants; 12-Month Findings on Petitions To List Penguin Species as Threatened or Endangered Under the Endangered Species Act; Proposed Rules VerDate Aug<31>2005 18:06 Dec 17, 2008 Jkt 217001 PO 00000 Frm 00001 Fmt 4717 Sfmt 4717 E:\FR\FM\18DEP2.SGM 18DEP2 rwilkins on PROD1PC63 with PROPOSALS2 77264 Federal Register / Vol. 73, No. 244 / Thursday, December 18, 2008 / Proposed Rules DEPARTMENT OF THE INTERIOR • Federal eRulemaking Portal: http:// within 12 months following receipt of www.regulations.gov. Follow the the petition on whether the requested Fish and Wildlife Service instructions for submitting comments. action is warranted, not warranted, or • U.S. mail or hand-delivery: Public warranted but precluded by higher- 50 CFR Part 17 Comments Processing, Attn: [FWS–R9– priority listing actions (this finding is [FWS–R9–IA–2008–0069; 96000–1671– IA–2008–0069]; Division of Policy and referred to as the ‘‘12-month finding’’). 0000–B6] Directives Management; U.S. Fish and Section 4(b)(3)(C) of the Act requires Wildlife Service; 4401 N. Fairfax Drive, that a finding of warranted but RIN 1018–AV73 Suite 222; Arlington, VA 22203. precluded for petitioned species should We will not accept comments by be treated as having been resubmitted Endangered and Threatened Wildlife e-mail or fax. We will post all comments on the date of the warranted but and Plants; 12-Month Finding on a on http://www.regulations.gov.
    [Show full text]
  • Key Bird Titles from Csiro Publishing
    No. 16 December 2017 Birds New Zealand The Magazine of the Ornithological Society of New Zealand Birds New Zealand NO. 16 DECEMBER 2017 Proud supporter of Birds New Zealand 3 President’s Report 4 Conference & AGM 2018 We are thrilled with our decision 5 Birds NZ Research Fund 2017 to support Birds New Zealand. Hoiho research Fruzio’s aim is to raise awareness of the dedicated 8 work of Birds New Zealand and to enable wider 8 Australasian Bittern tracking public engagement with the organisation. We have re-shaped our marketing strategy and made a firm 10 Seabird research commitment of $100,000 to be donated over the 11 NZ's oldest Royal Spoonbills course of the next 3 years. Follow our journey on: www.facebook/fruzio. 12 Whangarua birds, 1972-2016 PUBLISHERS 15 Reviews Published on behalf of the members of the Ornithological Society of New Zealand 16 Regional Roundup (Inc), P.O. Box 834, Nelson 7040, New Zealand. Email: [email protected] Website: www.osnz.org.nz Bird News Editor: Michael Szabo, 6/238 The Esplanade, Island Bay, Wellington 6023. 19 Email: [email protected] Tel: (04) 383 5784 ISSN 2357-1586 (Print) ISSN 2357-1594 (Online) We welcome advertising enquiries. Free classified ads for members are at the COVER IMAGE editor’s discretion. Articles or illustrations related to birds in New Zealand and the Front cover: Australasian Bittern or Matuku, Waikanae Estuary, 2017. South Pacific region are welcome in electronic form, such as news about birds, Photo by Imogen Warren members’ activities, birding sites, identification, letters, reviews, or photographs.
    [Show full text]
  • The Effect of Age on Laying Dates, Size of Eggs, and Size of Clutch in the Yellow-Eyed Penguin
    THE EFFECT OF AGE ON LAYING DATES, SIZE OF EGGS, AND SIZE OF CLUTCH IN THE YELLOW-EYED PENGUIN L. E. RICHDALE N THE twelve-year period from August 1936 to May 1948 I have carried out I a banding study of the Yellow-eyed Penguin, Megadyptes antipodes, on the Otago Peninsula, New Zealand. In the courseof this study it has been possible to note the behaviour of 162 young penguins from the time when they entered the water as fledglings until they disappeared from my field of operations. The age of individuals under review varied from 1 to 11 years with only 2 birds at- taining the age of 11 years. It is obvious, therefore, that by the time the study ended several of the penguins had become aged. Nevertheless, for the purpose of this paper all birds whose age is known are considered ‘young penguins.’ In addition to the 162 young penguins whose date of hatching could be determined there were also under observation 298 other young penguins which were banded in their first year. It was unknown when and where thesejuvenals were hatched but as all eggs of the Yellow-eyed Penguin are normally laid within a space of approximately 3 weeks in any one season,the age of these young birds is there- fore known to within 3 weeks. From the study of the behaviour of 460 young penguins in relation to their age, much information has evolved relative to the influence of age on breeding biol- ogy. In this paper only 3 aspectswill be considered: (1) the influence of age on laying dates; (2) the influence of age on size of eggs; and (3) the influence of age on size of clutch.
    [Show full text]
  • Ecotourism on Otago Peninsula
    Ecotourism on Otago Peninsula Preliminary studies of yellow-eyed penguin (Megadyptes antipodes) and Hooker's sea lion (Phocarctos hookeri) SCIENCE FOR CONSERVATION: 68 M. Wright Published by Department of Conservation P.O. Box 10-420 Wellington, New Zealand Science for Conservation presents the results of investigations by DoC staff, and by contracted science providers outside the Department of Conservation. Publications in this series are internally and externally peer reviewed © February 1998, Department of Conservation ISSN 1173-2946 ISBN 0-478-01962-9 This publication originated from work funded by New Zealand Employment Service Task Force Green and supported by Dunedin Field Centre and Otago Conservancy of DoC. The work was carried out by Marj Wright, present address: Department of Zoology, University of Otago, Box 56, Dunedin. It was approved for publication by the Director, Science and Research Division, Department of Conservation, Wellington. Cataloguing-in-Publication data Wright, M. Ecotourism on Otago Peninsula: preliminary studies of yellow-eyed penguin (Megadyptes antipodes) and Hooker's sea lion (Phocarctos hooked) / M. Wright. Wellington, N.Z. : Dept. of Conservation, 1998. 1 v. ; 30 cm. (Science for conservation, 1173-2946 ; 68.) Includes bibliographical references. ISBN 0478019629 1. Yellow-eyed penguin. 2. Hooker's sea lion. 3. Ecotourism-- New Zealand--Otago Peninsula I. Title. II. Series: Science for conservation (Wellington, N.Z.) ; 68. 338.47919392 20 zbn98-021065 CONTENTS Abstract 5 1. Introduction 6 2. Yellow-eyed penguin 9 2.1 Introduction 9 2.2 Methods 10 2.2.1 Study sites 10 2.2.2 Procedure 10 2.2.3 Data analysis 12 2.3 Results 12 2.4 Discussion 13 3.
    [Show full text]
  • What Explains the Diversity of Sexually Selected Traits?
    Biol. Rev. (2020), 95, pp. 847–864. 847 doi: 10.1111/brv.12593 Songs versus colours versus horns: what explains the diversity of sexually selected traits? John J. Wiens* and E. Tuschhoff Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, 85721-0088, U.S.A. ABSTRACT Papers on sexual selection often highlight the incredible diversity of sexually selected traits across animals. Yet, few studies have tried to explain why this diversity evolved. Animals use many different types of traits to attract mates and outcom- pete rivals, including colours, songs, and horns, but it remains unclear why, for example, some taxa have songs, others have colours, and others horns. Here, we first conduct a systematic survey of the basic diversity and distribution of dif- ferent types of sexually selected signals and weapons across the animal Tree of Life. Based on this survey, we describe seven major patterns in trait diversity and distributions. We then discuss 10 unanswered questions raised by these pat- terns, and how they might be addressed. One major pattern is that most types of sexually selected signals and weapons are apparently absent from most animal phyla (88%), in contrast to the conventional wisdom that a diversity of sexually selected traits is present across animals. Furthermore, most trait diversity is clustered in Arthropoda and Chordata, but only within certain clades. Within these clades, many different types of traits have evolved, and many types appear to have evolved repeatedly. By contrast, other major arthropod and chordate clades appear to lack all or most trait types, and similar patterns are repeated at smaller phylogenetic scales (e.g.
    [Show full text]
  • Maximum Diving Depths of Northern Rockhopper Penguins (Eudyptes Chrysocome Moseleyi ) at Amsterdam Island
    Polar Biol (1997) 17: 119Ð122 ( Springer-Verlag 1997 ORIGINAL PAPER Yann Tremblay á Eric Guinard á Yves Cherel Maximum diving depths of northern rockhopper penguins (Eudyptes chrysocome moseleyi ) at Amsterdam Island Received: 10 January 1996/Accepted: 31 March 1996 Abstract The mean maximum dive depth from 49 preying upon pelagic crustaceans during reproduction foraging bouts by northern rockhopper penguins, (Cooper et al. 1990). The limited information available measured using capillary-tube depth gauges, was on the northern rockhopper penguin at Gough Island 66$4 m (12Ð168 m). There were no di¤erences in the (40¡20@S; 09¡54@W) indicates that it preys mainly on maximum dive depths between male and female pen- crustaceans ('90% by mass), like its southern relative, guins. Northern rockhopper penguins dived deeper in while fish and squid are minor components of the diet early than in late creche stages (83$7vs57$4 m), (Klages et al. 1988). In the Atlantic and Indian Oceans, and this was associated with probable dietary changes, northern rockhopper penguins breed on volcanic is- squid dominating the diet by mass (44%) in November, lands devoid of periinsular shelf. They are consequently and fish (64%) in December 1994 at Amsterdam Island. obligatory oceanic foragers, a unique feature among crested penguins during breeding. This paper reports the first data on maximum diving Introduction depths attained by northern rockhopper penguins while rearing chicks. Sexual and temporal di¤erences in Crested penguins (genus Eudyptes) are the most numer- diving depths were investigated in male and female ous penguins, both by number of individuals and num- penguins during the early and late creche stages.
    [Show full text]
  • Trophic Ecology of Breeding Northern Rockhopper Penguins, Eudyptes Moseleyi, at Tristan Da Cunha, South Atlantic Ocean
    TROPHIC ECOLOGY OF BREEDING NORTHERN ROCKHOPPER PENGUINS, EUDYPTES MOSELEYI, AT TRISTAN DA CUNHA, SOUTH ATLANTIC OCEAN A Thesis submitted in the fulfilment of the requirements for the degree of Masters in Marine Biology at Rhodes University By JENNY MARIE BOOTH December 2011 Abstract Northern Rockhopper penguin populations, Eudyptes moseleyi, are declining globally, and at Tristan da Cunha have undergone severe declines (> 90% in the last 130 years), the cause(s) of which are unknown. There is a paucity of data on this species in the South Atlantic Ocean, therefore their trophic ecology at Tristan da Cunha was studied, specifically focusing on diet, using stomach content analysis and stable isotope analysis (SIA), in conjunction with an analysis of diving behaviour, assessed using temperature-depth recorders. In order to evaluate the influence of gender on foraging, a morphometric investigation of sexual dimorphism was confirmed using molecular analysis. Additionally, plasma corticosterone levels were measured to examine breeding stage and presence of blood parasites as potential sources of stress during the breeding season. Northern Rockhopper penguins at Tristan da Cunha displayed a high degree of foraging plasticity, and fed opportunistically on a wide variety of prey, probably reflecting local small-scale changes in prey distribution. Zooplankton dominated (by mass) the diet of guard stage females, whereas small meso-pelagic fish (predominantly Photichthyidae) dominated diet of adults of both sexes in the crèche stage, with cephalopods contributing equally in both stages. Adults consistently fed chicks on lower-trophic level prey (assessed using SIA), probably zooplankton, than they consumed themselves indicating that the increasing demands of growing chicks were not met by adults through provisioning of higher-quality prey.
    [Show full text]