Mating Systems and Sexual Selection in Ungulatesnew Insights from A

Total Page:16

File Type:pdf, Size:1020Kb

Mating Systems and Sexual Selection in Ungulatesnew Insights from A Mating systems and sexual selection in ungulatesNew insights from a territorial species with low sexual size dimorphism:the European roe deer (Capreolus capreolus) Cécile Vanpé To cite this version: Cécile Vanpé. Mating systems and sexual selection in ungulatesNew insights from a territorial species with low sexual size dimorphism:the European roe deer (Capreolus capreolus). Ecology, environment. Université Paul Sabatier - Toulouse III; Swedish University of Agricultural Sciences, Uppsala, 2007. English. tel-00259495 HAL Id: tel-00259495 https://tel.archives-ouvertes.fr/tel-00259495 Submitted on 28 Feb 2008 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. UNIVERSITE PAUL SABATIER - TOULOUSE III SWEDISH UNIVERSITY OF AGRICULTURAL SCIENCES THESIS to obtain the degree of Docteur de l’Université Paul Sabatier - Toulouse III Doctor of the Swedish University of Agricultural Sciences Discipline: Behaviour, Ecology and Evolution Presented and defended in public by: Cécile VANPE On the 21th of June 2007 MATING SYSTEMS AND SEXUAL SELECTION IN UNGULATES New insights from a territorial species with low sexual size dimorphism: the European roe deer (Capreolus capreolus) Ph.D. supervisors: Mark Hewison (CEFS – INRA Toulouse, France) Henrik Andrén (Grimsö Wildlife Research Station - SLU, Sweden) JURY Stéphane Aulagnier Université Paul Sabatier - Toulouse III Chairman Marco Festa-Bianchet Université de Sherbrooke Opponent/Referee Anna Qvarnström Uppsala University Examiner/Referee Dominique Allainé Université Claude Bernard – Lyon I Examiner Etienne Danchin CNRS Toulouse Examiner Mark Hewison INRA Toulouse Co-director Henrik Andrén Swedish University of Agricultural Sciences Co-director Petter Kjellander Swedish University of Agricultural Sciences Invited Jean-Michel Gaillard CNRS Lyon Invited Laboratoire Comportement et Ecologie de la Faune Sauvage – INRA, Castanet-Tolosan, France Grimsö Wildlife Research Station, Swedish University of Agricultural Sciences, Riddarhyttan, Sweden 2 "Of the branches of biological science to which Charles Darwin's life-work has given us the key, few, if any, are as attractive as the subject of sexual selection" (Fisher 1915) 3 4 ACKNOWLEDGEMENTS • First and foremost, I would like to express all my gratitude towards Mark Hewison, my true-false “French” supervisor. Merci pour ta confiance, ton soutien et tes encouragements quotidiens, tes précieux conseils, ta disponibilité sans limites et ta patience (toc toc, c’est encore moi !!), ton enthousiasme et ta bonne humeur à toutes épreuves. Merci aussi de m’avoir permis d’améliorer mon anglais (je pense que tes efforts ont porté leurs fruits !) et de t’être soucié de mon avenir professionnel. Merci enfin d’avoir accepté d’être mon chauffeur de nombreuses fois entre chez Jean-Michel et le CEFS (Mea culpa, je n’ai jamais demandé mon autorisation de conduire les véhicules de service !). Bien au-delà de mon sujet de thèse, j’ai appris beaucoup à tes côtés (notamment durant les longues heures de voiture en tête à tête, les pauses café ou les soirées arrosées) sur les ongulés, l’écologie comportementale et la biologie des populations en général, mais aussi sur les rouages complexes du monde de la recherche, ta vision du métier de chercheur, le rock anglais, le sport, et bien d’autres choses… I could not wish for a better supervisor ! • Second, I would like to warmly thank Petter Kjellander, my Swedish true-false co- supervisor. Tack so mycket ! Without you, my field work at Bogesund would be impossible ! Thank you for your warm welcome in Sweden, your precious help for all aspects of my life in Sweden (from field-work at Bogesund to holidays in Lapland, from Swedish food to rented car, from administrative documents to credit card and mobile phone), for your great ideas for naturalist trips (grouse, crane, bear, wolf)... Despite the distance between us and your busy life (between field-work, research, children, pets, moose hunting, ...), you managed to be a good supervisor ! I have excellent memories of my stay in Sweden thanks to you ! The wolf howling during one of my last days in Sweden has remained engraved in my memory... • Henrik Andrén should be thanked to have accepted to be my official Swedish co- supervisor, to have been the precious link with the Swedish University of Agricultural Sciences, and to help me in administrative problems of my joint-agreement. • A special thanks to Jean-Michel Gaillard for his extensive and helpful suggestions, comments, corrections and advice on my work, for his help in statistics, for his support and his encouragements. Merci d’avoir pris le temps de m’expliquer les rouages de la recherche, de m’avoir également fait partagé ta vision du métier de chercheur (une vision un peu différente de celle de Mark ?) et de t’être soucié de mon avenir professionnel. Plus qu’un collaborateur de la thèse, tu as joué largement le rôle d’un co-directeur. • I am also particularly grateful to Nicolas Morellet for his extensive help in statistics and R programmation, his support and his advice. Merci pour ta disponibilité sans limites, ton aide précieuse et ton soutien ! • Thank you to all the members of my Ph.D. committee for their precious advices and helpful suggestions on my thesis project: Mark Hewison, Henrik Andrén, Petter Kjellander, that I have already thanked, but also Jacob Höglund, Jean-Michel Gaillard, Jean-François Cosson, and Stéphane Aulagnier. Fate decreed that we could not get all together ! • I would like to thank all the members of my Ph.D jury Marco Festa-Bianchet, Anna Qvarnström, Etienne Danchin, Dominique Allainé, Jean-Michel Gaillard, Mark Hewison, 5 Henrik Andrén, Petter Kjellander, Jacob Höglund, Stéphane Aulagnier. Thank you to Marco Festa-Bianchet and Anna Qvarnström to have accepted to review my thesis as “referees”. • Another very important factor contributing to my work has been the numerous field assistants who have helped me to collect the field data at Bogesund during the spring- summer 2004 and 2005: Pauline Delos, Markus Olsson, Anna Sandhammar, Maria Tybergsson, Marci Johnson, Kathryn Schwadere, Mathieu Sarrasa, Jonas Bergson, Anders Janermo. A special thanks to Pauline and Mathieu to have put up with me during 5 months, to have been willing to get up very early at dawn and to go to bed very late after dusk to radio-track roe deer, to have shared my life on a day-to-day basis, my stress, my joice and my sadness, my meals, my holidays in Lapland, Vesterälen and Norway (it was quite a saga !), my hiking on the tracks of Bogesund, my drive to the library of Waxhölm (the precious umbilical cord with the boyfriend, the family, the lab, and Mark) or to the supermarket... Without you, my stay in Sweden would have been really lonely. I be deeply indebted to you ! I am also grateful to Markus and Jonas (and their numerous dogs) for their great and hard work on the field, their friendship, their support and endless good mood. You have been great guides to discover Swedish culture. Best wishes guys !!!! Jonas, I didn’t forget the rotten fish experience ! You are welcome to France to have a test of snakes and frogs !!! Thank you Anders for your precious help and advice to catch fawns. Thank you Maria for your great work on vegetation sampling and Per Grängstedt for vegetation weighting. Thank you Anna and the US team Katy and Marci (Do not forget my French lessons) for your help with radio-tracking. I would like finally to thank Mark Hewison, Nicolas Morellet, Bruno Cargnelutti, Petter Kjellander and Fredrik Knape to have done fawn captures in 2006. Mark, Nico and Bruno, I was happy that you discover my field-work study site and “my” roe deer. • Maxime Galan deserve special thanks for his great work on molecular analyses (DNA samples in thousands !). Merci de m’avoir expliquer et montrer patiemment comment réaliser les extractions d’ADN, les PCR, les génotypages, les relectures. Merci pour ton accueil pendant mes séjours au CBGP. Thanks a lot to Jean-François Cosson for his advice on molecular analyses and welcome at the CBGP. The following people also contributed to lab work: Pia and Petter Kjellander for extractions and genotypages, Bruno Lourtet and Jean- Marc Angibault for the preparation of DNA samples. • I am grateful to Michel Goulard for his helps in statistics and Clément Calenge for his advice on niche and K-select analyses. • Thank you to the ONCFS to have allowed me to analyse data from Chizé and Trois Fontaines, and especially to Guy Van Laere, Daniel Delorme and François Klein. I am also grateful to a large number of people for help of different sorts and their support: • People of CEFS – INRA Toulouse: Stéphane Aulagnier (the director of the lab) pour son accueil au laboratoire et pour m’avoir permis de m’initier à l’enseignement. Aurélie Coulon, Marion Delon, Nina Giotto, Cathy Boleat, Emmanuelle Richard and Sarah Benhaiem who have shared my office and my days of work. Merci Aurélie pour ton soutien, ton aide, tes conseils, tes encouragements, ton accueil chez toi quand j’étais SDF, nos 6 discussions, et surtout ton amitié. Ma thèse n’aurait pas été si agréable sans ta joyeuse présence à mes côtés ! Bon vent à toi pour la suite ! Pascale Dufour and Lucette Gabet (the secretaries) to have patiently solved my administrative problems. Merci Pascale pour ton accueil au labo, l’animation du labo, les sorties culturelles, les discussions sur tout et rien aux pauses café et au restau de l’INRA, ton soutien quotidien.
Recommended publications
  • Damaliscus Pygargus Phillipsi – Blesbok
    Damaliscus pygargus phillipsi – Blesbok colour pattern (Fabricius et al. 1989). Hybridisation between these taxa threatens the genetic integrity of both subspecies (Skinner & Chimimba 2005). Assessment Rationale Listed as Least Concern, as Blesbok are abundant on both formally and privately protected land. We estimate a minimum mature population size of 54,426 individuals (using a 70% mature population structure) across 678 protected areas and wildlife ranches (counts between 2010 and 2016). There are at least an estimated 17,235 animals (counts between 2013 and 2016) on formally Emmanuel Do Linh San protected areas across the country, with the largest subpopulation occurring on Golden Gate Highlands National Park. The population has increased significantly Regional Red List status (2016) Least Concern over three generations (1990–2015) in formally protected National Red List status (2004) Least Concern areas across its range and is similarly suspected to have increased on private lands. Apart from hybridisation with Reasons for change No change Bontebok, there are currently no major threats to its long- Global Red List status (2008) Least Concern term survival. Approximately 69% of Blesbok can be considered genetically pure (A. van Wyk & D. Dalton TOPS listing (NEMBA) None unpubl. data), and stricter translocation policies should be CITES listing None established to prevent the mixing of subspecies. Overall, this subspecies could become a keystone in the Endemic Yes sustainable wildlife economy. The common name, Blesbok, originates from ‘Bles’, the Afrikaans word for a ‘blaze’, which Distribution symbolises the white facial marking running down Historically, the Blesbok ranged across the Highveld from the animal’s horns to its nose, broken only grasslands of the Free State and Gauteng provinces, by the brown band above the eyes (Skinner & extending into northwestern KwaZulu-Natal, and through Chimimba 2005).
    [Show full text]
  • REVIEW Physiological Dependence on Copulation in Parthenogenetic Females Can Reduce the Cost of Sex
    ANIMAL BEHAVIOUR, 2004, 67, 811e822 doi:10.1016/j.anbehav.2003.05.014 REVIEW Physiological dependence on copulation in parthenogenetic females can reduce the cost of sex M. NEIMAN Department of Biology, Indiana University, Bloomington (Received 6 December 2002; initial acceptance 10 April 2003; final acceptance 27 May 2003; MS. number: ARV-25) Despite the two-fold reproductive advantage of asexual over sexual reproduction, the majority of eukaryotic species are sexual. Why sex is so widespread is still unknown and remains one of the most important unanswered questions in evolutionary biology. Although there are several hypothesized mechanisms for the maintenance of sex, all require assumptions that may limit their applicability. I suggest that the maintenance of sex may be aided by the detrimental retention of ancestral traits related to sexual reproduction in the asexual descendants of sexual taxa. This reasoning is based on the fact that successful reproduction in many obligately sexual species is dependent upon the behavioural, physical and physiological cues that accompany sperm delivery. More specifically, I suggest that although parthenogenetic (asexual) females have no need for sperm per se, parthenogens descended from sexual ancestors may not be able to reach their full reproductive potential in the absence of the various stimuli provided by copulatory behaviour. This mechanism is novel in assuming no intrinsic advantage to producing genetically variable offspring; rather, sex is maintained simply through phylogenetic constraint. I review and synthesize relevant literature and data showing that access to males and copulation increases reproductive output in both sexual and parthenogenetic females. These findings suggest that the current predominance of sexual reproduction, despite its well-documented drawbacks, could in part be due to the retention of physiological dependence on copulatory stimuli in parthenogenetic females.
    [Show full text]
  • Fitzhenry Yields 2016.Pdf
    Stellenbosch University https://scholar.sun.ac.za ii DECLARATION By submitting this dissertation electronically, I declare that the entirety of the work contained therein is my own, original work, that I am the sole author thereof (save to the extent explicitly otherwise stated), that reproduction and publication thereof by Stellenbosch University will not infringe any third party rights and that I have not previously in its entirety or in part submitted it for obtaining any qualification. Date: March 2016 Copyright © 2016 Stellenbosch University All rights reserved Stellenbosch University https://scholar.sun.ac.za iii GENERAL ABSTRACT Fallow deer (Dama dama), although not native to South Africa, are abundant in the country and could contribute to domestic food security and economic stability. Nonetheless, this wild ungulate remains overlooked as a protein source and no information exists on their production potential and meat quality in South Africa. The aim of this study was thus to determine the carcass characteristics, meat- and offal-yields, and the physical- and chemical-meat quality attributes of wild fallow deer harvested in South Africa. Gender was considered as a main effect when determining carcass characteristics and yields, while both gender and muscle were considered as main effects in the determination of physical and chemical meat quality attributes. Live weights, warm carcass weights and cold carcass weights were higher (p < 0.05) in male fallow deer (47.4 kg, 29.6 kg, 29.2 kg, respectively) compared with females (41.9 kg, 25.2 kg, 24.7 kg, respectively), as well as in pregnant females (47.5 kg, 28.7 kg, 28.2 kg, respectively) compared with non- pregnant females (32.5 kg, 19.7 kg, 19.3 kg, respectively).
    [Show full text]
  • Beatragus Hunteri) in Arawale National Reserve, Northeastern, Kenya
    The population size, abundance and distribution of the Critically Endangered Hirola Antelope (Beatragus hunteri) in Arawale National Reserve, Northeastern, Kenya. Francis Kamau Muthoni Terra Nuova, Transboundary Environmental Project, P.O. Box 74916, Nairobi, Kenya Email: [email protected] 1.0. Abstract. This paper outlines the spatial distribution, population size, habitat preferences and factors causing the decline of Hirola antelope in Arawale National Reserve (ANR) in Garissa and Ijara districts, north eastern Kenya. The reserve covers an area of 540Km2. The objectives of the study were to gather baseline information on hirola distribution, population size habitat preferences and human activities impacting on its existence. A sampling method using line transect count was used to collect data used to estimate the distribution of biological populations (Norton-Griffiths, 1978). Community scouts collected data using Global Positioning Systems (GPS) and recorded on standard datasheets for 12 months. Transect walks were done from 6.00Am to 10.00Am every 5th day of the month. The data was entered into a geo-database and analysed using Arcmap, Ms Excel and Access. The results indicate that the population of hirola in Arawale National Reserve were 69 individuals comprising only 6% of the total population in the natural geographic range of hirola estimated to be 1,167 individuals. It also revealed that hirola prefer open bushes and grasslands. The decline of the Hirola on its natural range is due to a combination of factors, including, habitat loss and degradation, competition with livestock, poaching and drought. Key words: Hirola Antelope Beatragus hunteri, GIS, Endangered Species 2.0. Introduction. The Hirola antelope (Beatragus hunteri) is a “Critically Endangered” species endemic to a small area in Southeast Kenya and Southwest Somalia.
    [Show full text]
  • A Genus-Level Phylogenetic Analysis of Antilocapridae And
    A GENUS-LEVEL PHYLOGENETIC ANALYSIS OF ANTILOCAPRIDAE AND IMPLICATIONS FOR THE EVOLUTION OF HEADGEAR MORPHOLOGY AND PALEOECOLOGY by HOLLEY MAY FLORA A THESIS Presented to the Department of EArth Sciences And the Graduate School of the University of Oregon in partiAl fulfillment of the requirements for the degree of MAster of Science September 2019 THESIS APPROVAL PAGE Student: Holley MAy Flora Title: A Genus-level Phylogenetic Analysis of AntilocApridae and ImplicAtions for the Evolution of HeAdgeAr Morphology and PAleoecology This Thesis has been accepted and approved in partiAl fulfillment of the requirements for the MAster of Science degree in the Department of EArth Sciences by: EdwArd Byrd DAvis Advisor SAmAntha S. B. Hopkins Core Member Matthew Polizzotto Core Member Stephen Frost Institutional RepresentAtive And JAnet Woodruff-Borden DeAn of the Graduate School Original Approval signatures are on file with the University of Oregon Graduate School Degree awArded September 2019. ii ã 2019 Holley MAy Flora This work is licensed under a CreAtive Commons Attribution-NonCommercial-NoDerivs (United States) License. iii THESIS ABSTRACT Holley MAy Flora MAster of Science Department of EArth Sciences September 2019 Title: A Genus-level Phylogenetic Analysis of AntilocApridae and ImplicAtions for the Evolution of HeAdgeAr Morphology and PAleoecology The shapes of Artiodactyl heAdgeAr plAy key roles in interactions with their environment and eAch other. Consequently, heAdgeAr morphology cAn be used to predict behavior. For eXAmple, lArger, recurved horns are typicAl of gregarious, lArge-bodied AnimAls fighting for mAtes. SmAller spike-like horns are more characteristic of small- bodied, paired mAtes from closed environments. Here, I report a genus-level clAdistic Analysis of the extinct family, AntilocApridae, testing prior hypotheses of evolutionary history And heAdgeAr evolution.
    [Show full text]
  • Ecology of Red Deer a Research Review Relevant to Their Management in Scotland
    Ecologyof RedDeer A researchreview relevant to theirmanagement in Scotland Instituteof TerrestrialEcology Natural EnvironmentResearch Council á á á á á Natural Environment Research Council Institute of Terrestrial Ecology Ecology of Red Deer A research review relevant to their management in Scotland Brian Mitchell, Brian W. Staines and David Welch Institute of Terrestrial Ecology Banchory iv Printed in England by Graphic Art (Cambridge) Ltd. ©Copyright 1977 Published in 1977 by Institute of Terrestrial Ecology 68 Hills Road Cambridge CB2 11LA ISBN 0 904282 090 Authors' address: Institute of Terrestrial Ecology Hill of Brathens Glassel, Banchory Kincardineshire AB3 4BY Telephone 033 02 3434. The Institute of Terrestrial Ecology (ITE) was established in 1973, from the former Nature Conservancy's research stations and staff, joined later by the Institute of Tree Biology and the Culture Centre of Algae and Protozoa. ITE contributes to and draws upon the collective knowledge of the fourteen sister institutes which make up the Natural Environment Research Council, spanning all the environmental sciences. The Institute studies the factors determining the structure, composition and processes of land and freshwater systems, and of individual plant and animal species. It is developing a Sounder scientific basis for predicting and modelling environmental trends arising from natural or man-made change. The results of this research are available to those responsible for the protection, management and wise use of our natural resources. Nearly half of ITE'Swork is research commissioned by customers, such as the Nature Conservancy Council who require information for wildlife conservation, the Forestry Commission and the Department of the Environment. The remainder is fundamental research supported by NERC.
    [Show full text]
  • Connochaetes Gnou – Black Wildebeest
    Connochaetes gnou – Black Wildebeest Blue Wildebeest (C. taurinus) (Grobler et al. 2005 and ongoing work at the University of the Free State and the National Zoological Gardens), which is most likely due to the historic bottlenecks experienced by C. gnou in the late 1800s. The evolution of a distinct southern endemic Black Wildebeest in the Pleistocene was associated with, and possibly driven by, a shift towards a more specialised kind of territorial breeding behaviour, which can only function in open habitat. Thus, the evolution of the Black Wildebeest was directly associated with the emergence of Highveld-type open grasslands in the central interior of South Africa (Ackermann et al. 2010). Andre Botha Assessment Rationale Regional Red List status (2016) Least Concern*† This is an endemic species occurring in open grasslands in the central interior of the assessment region. There are National Red List status (2004) Least Concern at least an estimated 16,260 individuals (counts Reasons for change No change conducted between 2012 and 2015) on protected areas across the Free State, Gauteng, North West, Northern Global Red List status (2008) Least Concern Cape, Eastern Cape, Mpumalanga and KwaZulu-Natal TOPS listing (NEMBA) (2007) Protected (KZN) provinces (mostly within the natural distribution range). This yields a total mature population size of 9,765– CITES listing None 11,382 (using a 60–70% mature population structure). This Endemic Yes is an underestimate as there are many more subpopulations on wildlife ranches for which comprehensive data are *Watch-list Threat †Conservation Dependent unavailable. Most subpopulations in protected areas are stable or increasing.
    [Show full text]
  • Reproductive Ecology & Sexual Selection
    Reproductive Ecology & Sexual Selection REPRODUCTIVE ECOLOGY REPRODUCTION & SEXUAL SELECTION • Asexual • Sexual – Attraction, Courtship, and Mating – Fertilization – Production of Young The Evolutionary Enigma of Benefits of Asex Sexual Reproduction • Sexual reproduction produces fewer reproductive offspring than asexual reproduction, a so-called reproductive handicap 1. Eliminate problem to locate, court, & retain suitable mate. Asexual reproduction Sexual reproduction Generation 1 2. Doubles population growth rate. Female Female 3. Avoid “cost of meiosis”: Generation 2 – genetic representation in later generations isn't reduced by half each time Male 4. Preserve gene pool adapted to local Generation 3 conditions. Generation 4 Figure 23.16 The Energetic Costs of Sexual Reproduction Benefits of Sex • Allocation of Resources 1. Reinforcement of social structure 2. Variability in face of changing environment. – why buy four lottery tickets w/ the same number on them? Relative benefits: Support from organisms both asexual in constant & sexual in changing environments – aphids have wingless female clones & winged male & female dispersers – ciliates conjugate if environment is deteriorating Heyer 1 Reproductive Ecology & Sexual Selection Simultaneous Hermaphrodites TWO SEXES • Advantageous if limited mobility and sperm dispersal and/or low population density • Guarantee that any member of your species encountered is the • Conjugation “right” sex • Self fertilization still provides some genetic variation – Ciliate protozoans with + & - mating
    [Show full text]
  • GNUSLETTER Volume 37 Number 1
    GNUSLETTER Volume 37 Number 1 ANTELOPE SPECIALIST GROUP July 2020 ISSN 2304-0718 IUCN Species Survival Commission Antelope Specialist Group GNUSLETTER is the biannual newsletter of the IUCN Species Survival Commission Antelope Specialist Group (ASG). First published in 1982 by first ASG Chair Richard D. Estes, the intent of GNUSLETTER, then and today, is the dissemination of reports and information regarding antelopes and their conservation. ASG Members are an important network of individuals and experts working across disciplines throughout Africa and Asia. Contributions (original articles, field notes, other material relevant to antelope biology, ecology, and conservation) are welcomed and should be sent to the editor. Today GNUSLETTER is published in English in electronic form and distributed widely to members and non-members, and to the IUCN SSC global conservation network. To be added to the distribution list please contact [email protected]. GNUSLETTER Review Board Editor, Steve Shurter, [email protected] Co-Chair, David Mallon Co-Chair, Philippe Chardonnet ASG Program Office, Tania Gilbert, Phil Riordan GNUSLETTER Editorial Assistant, Stephanie Rutan GNUSLETTER is published and supported by White Oak Conservation The Antelope Specialist Group Program Office is hosted and supported by Marwell Zoo http://www.whiteoakwildlife.org/ https://www.marwell.org.uk The designation of geographical entities in this report does not imply the expression of any opinion on the part of IUCN, the Species Survival Commission, or the Antelope Specialist Group concerning the legal status of any country, territory or area, or concerning the delimitation of any frontiers or boundaries. Views expressed in Gnusletter are those of the individual authors, Cover photo: Peninsular pronghorn male, El Vizcaino Biosphere Reserve (© J.
    [Show full text]
  • Reproduction in Humans
    P5/6 SCIENCE Reproduction In Humans Sexual reproduction does not only occur in plants. It also occurs in humans where the female reproductive cell and the male reproductive cell unite to form a new individual. Female Sex Organs The ovary is part of the female sex organ. There are two ovaries in each woman’s body. Ova (singular ovum) or eggs are the female sex cells. The ova are stored in the ovaries of a female. A female is born with all the unripe eggs (or ova) she will ever have in her lifetime. When she reaches puberty, an egg will start to mature in the ovary. Every month, an egg will be released by the ovary into one of the Fallopian tubes. This is called ovulation. On average, a female is born with approximately one million eggs but they decline in number and quality as she grows older. In fact, a girl is only left with about 400,000 eggs by the time she reaches puberty. Only a few hundred are released during ovulation. Fallopian tubes ovary uterus (womb) cervix vagina Female reproductive system Male Sex Organs A male has two sex organs. They are the testis and the penis. Sperms are the male sex cells. They are produced in the testes. When a boy reaches puberty, his testes will start to produce sperms. It takes about 72 days for a sperm to grow. urinary bladder (stores urine, not part of the reproductive system) sperm ducts testes penis Male reproductive system Taken from SCIENCE PARTNER: A Complete Guide To Upper Block Science © Singapore Asia Publishers Pte Ltd SAPSCSP5&6_W04 Website: www.sapgrp.com | Facebook: Singapore-Asia-Publishers Page 1/8 P5/6 SCIENCE Reproduction In Humans A sperm cell consists of a head (where the nucleus lies), the midpiece (which is the motor of the sperm) and a tail which helps it to swim.
    [Show full text]
  • Gallina & Mandujano
    Mongabay.com Open Access Journal - Tropical Conservation Science Vol. 2 (2):116-127, 2009 Special issue: introduction Research on ecology, conservation and management of wild ungulates in Mexico Sonia Gallina1 and Salvador Mandujano1 1 Departamento de Biodiversidad y Ecología Animal, Instituto de Ecología A. C., km. 2.5 Carret. Ant. Coatepec No. 351, Congregación del Haya, Xalapa 91070, Ver. México. E‐mail: <[email protected]>; <[email protected]> Abstract This special issue of Tropical Conservation Science provides a synopsis of nine of the eleven presentations on ungulates presented at the Symposium on Ecology and Conservation of Ungulates in Mexico during the Mexican Congress of Ecology held in November 2008 in Merida, Yucatan. Of the eleven species of wild ungulates in Mexico (Baird´s tapir Tapirus bairdii, pronghorn antelope Antilocapra americana, American bison Bison bison, bighorn sheep Ovis canadensis, elk Cervus canadensis, red brocket deer Mazama temama, Yucatan brown brocket Mazama pandora, mule deer Odocoileus hemionus, white-tailed deer Odocoileus virginianus, white-lipped peccary Tayassu pecari and collared peccary Pecari tajacu), studies which concern four of these species are presented: Baird’s tapir and the white lipped peccary, which are tropical species in danger of extinction; the bighorn sheep, of high value for hunting in the north-west; and the white-tailed deer, the most studied ungulate in Mexico due to its wide distribution in the country and high hunting and cultural value. In addition, two studies of exotic species, wild boar (Sus scrofa) and red deer (Cervus elaphus), are presented. Issues addressed in these studies are: population estimates, habitat use, evaluation of UMA (Spanish acronym for ‘Wildlife Conservation, Management and Sustainable Utilization Units’) and ANP (Spanish acronym for ‘Natural Protected Areas’) to sustain minimum viable populations, and the effect of alien species in protected areas and UMA, all of which allow an insight into ungulate conservation and management within the country.
    [Show full text]
  • Sexual Selection and Extinction in Deer Saloume Bazyan
    Sexual selection and extinction in deer Saloume Bazyan Degree project in biology, Master of science (2 years), 2013 Examensarbete i biologi 30 hp till masterexamen, 2013 Biology Education Centre and Ecology and Genetics, Uppsala University Supervisor: Jacob Höglund External opponent: Masahito Tsuboi Content Abstract..............................................................................................................................................II Introduction..........................................................................................................................................1 Sexual selection........................................................................................................................1 − Male-male competition...................................................................................................2 − Female choice.................................................................................................................2 − Sexual conflict.................................................................................................................3 Secondary sexual trait and mating system. .............................................................................3 Intensity of sexual selection......................................................................................................5 Goal and scope.....................................................................................................................................6 Methods................................................................................................................................................8
    [Show full text]