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Biology; of the Seal
7 PREFACE The first International Symposium on the Biology papers were read by title and are included either in of the Seal was held at the University of Guelph, On full or abstract form in this volume. The 139 particip tario, Canada from 13 to 17 August 1972. The sym ants represented 16 countries, permitting scientific posium developed from discussions originating in Dub interchange of a truly international nature. lin in 1969 at the meeting of the Marine Mammals In his opening address, V. B. Scheffer suggested that Committee of the International Council for the Ex a dream was becoming a reality with a meeting of ploration of the Sea (ICES). The culmination of such a large group of pinniped biologists. This he felt three years’ organization resulted in the first interna was very relevant at a time when the relationship of tional meeting, and this volume. The president of ICES marine mammals and man was being closely examined Professor W. Cieglewicz, offered admirable support as on biological, political and ethical grounds. well as honouring the participants by attending the The scientific session commenced with a seven paper symposium. section on evolution chaired by E. D. Mitchell which The programme committee was composed of experts showed the origins and subsequent development of representing the major international sponsors. W. N. this amphibious group of higher vertebrates. Many of Bonner, Head, Seals Research Division, Institute for the arguments for particular evolutionary trends are Marine Environmental Research (IMER), represented speculative in nature and different interpretations can ICES; A. W. Mansfield, Director, Arctic Biological be attached to the same fossil material. -
Monk Seals in Post-Classical History
Monk Seals in Post-Classical History The role of the Mediterranean monk seal (Monachus monachus) in European history and culture, from the fall of Rome to the 20th century William M. Johnson Mededelingen No. 39 2004 NEDERLANDSCHE COMMISSIE VOOR INTERNATIONALE NATUURBESCHERMING Mededelingen No. 39 i NEDERLANDSCHE COMMISSIE VOOR INTERNATIONALE NATUURBESCHERMING Netherlands Commission for International Nature Protection Secretariaat: Dr. H.P. Nooteboom National Herbarium of the Netherlands Rijksuniversiteit Leiden Einsteinweg 2 Postbus 9514, 2300 RA Leiden Mededelingen No. 39, 2004 Editor: Dr. H.P. Nooteboom PDF edition 2008: Matthias Schnellmann Copyright © 2004 by William M. Johnson ii MONK SEALS IN POST-CLASSICAL HISTORY The role of the Mediterranean monk seal (Monachus monachus) in European history and culture, from the fall of Rome to the 20th century by William M. Johnson Editor, The Monachus Guardian www.monachus-guardian.org email: [email protected] iii iv TABLE OF CONTENTS MONK SEALS IN POST-CLASSICAL HISTORY ......................................................III ABSTRACT ......................................................................................................................... VII ACKNOWLEDGEMENTS ........................................................................................................ VII MONK SEALS IN POST-CLASSICAL HISTORY ..............................................................................1 AN INTRODUCTION TO THE SPECIES ......................................................................1 -
56. Otariidae and Phocidae
FAUNA of AUSTRALIA 56. OTARIIDAE AND PHOCIDAE JUDITH E. KING 1 Australian Sea-lion–Neophoca cinerea [G. Ross] Southern Elephant Seal–Mirounga leonina [G. Ross] Ross Seal, with pup–Ommatophoca rossii [J. Libke] Australian Sea-lion–Neophoca cinerea [G. Ross] Weddell Seal–Leptonychotes weddellii [P. Shaughnessy] New Zealand Fur-seal–Arctocephalus forsteri [G. Ross] Crab-eater Seal–Lobodon carcinophagus [P. Shaughnessy] 56. OTARIIDAE AND PHOCIDAE DEFINITION AND GENERAL DESCRIPTION Pinnipeds are aquatic carnivores. They differ from other mammals in their streamlined shape, reduction of pinnae and adaptation of both fore and hind feet to form flippers. In the skull, the orbits are enlarged, the lacrimal bones are absent or indistinct and there are never more than three upper and two lower incisors. The cheek teeth are nearly homodont and some conditions of the ear that are very distinctive (Repenning 1972). Both superfamilies of pinnipeds, Phocoidea and Otarioidea, are represented in Australian waters by a number of species (Table 56.1). The various superfamilies and families may be distinguished by important and/or easily observed characters (Table 56.2). King (1983b) provided more detailed lists and references. These and other differences between the above two groups are not regarded as being of great significance, especially as an undoubted fur seal (Australian Fur-seal Arctocephalus pusillus) is as big as some of the sea lions and has some characters of the skull, teeth and behaviour which are rather more like sea lions (Repenning, Peterson & Hubbs 1971; Warneke & Shaughnessy 1985). The Phocoidea includes the single Family Phocidae – the ‘true seals’, distinguished from the Otariidae by the absence of a pinna and by the position of the hind flippers (Fig. -
Underwater Hearing and Communication in the Endangered Hawaiian Monk Seal Neomonachus Schauinslandi
Vol. 44: 61–78, 2021 ENDANGERED SPECIES RESEARCH Published January 28 https://doi.org/10.3354/esr01092 Endang Species Res OPEN ACCESS Underwater hearing and communication in the endangered Hawaiian monk seal Neomonachus schauinslandi Jillian M. Sills1,*, Kirby Parnell2,3, Brandi Ruscher2, Chloe Lew1, Traci L. Kendall4, Colleen Reichmuth1 1Institute of Marine Sciences, Long Marine Laboratory, University of California Santa Cruz, Santa Cruz, CA 95060, USA 2Department of Ocean Sciences, University of California Santa Cruz, Santa Cruz, CA 95064, USA 3Marine Mammal Research Program, Hawai‘i Institute of Marine Biology, University of Hawai‘i, Kaneohe, HI 96744, USA 4Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA 95064, USA ABSTRACT: Hawaiian monk seals are among the most endangered marine mammals and the most basal of the phocid seals. The auditory biology of monk seals is compelling from behavioral, evolutionary, and conservation perspectives, but we presently lack substantive bioacoustic infor- mation for this species, with no formal descriptions of underwater vocalizations and limited data concerning hearing. These seals have been isolated for more than 10 million yr and have auditory structures differing from those of related species. Additionally, unlike other aquatically mating phocids, monk seals breed asynchronously and are not known to produce social calls in water. To address existing knowledge gaps, we trained a mature male Hawaiian monk seal to perform a psychophysical task while submerged. Detection thresholds were measured for narrowband sounds across the frequency range of hearing. We also conducted a year-round characterization of the seal’s spontaneous underwater vocalizations. This individual demonstrated best hearing between 0.2 and 33 kHz, with a lower high-frequency roll-off than that of related species. -
Full Text in Pdf Format
Vol. 16: 149–163, 2012 ENDANGERED SPECIES RESEARCH Published online February 29 doi: 10.3354/esr00392 Endang Species Res Age estimation, growth and age-related mortality of Mediterranean monk seals Monachus monachus Sinéad Murphy1,*, Trevor R. Spradlin1,2, Beth Mackey1, Jill McVee3, Evgenia Androukaki4, Eleni Tounta4, Alexandros A. Karamanlidis4, Panagiotis Dendrinos4, Emily Joseph4, Christina Lockyer5, Jason Matthiopoulos1 1Sea Mammal Research Unit, Scottish Oceans Institute, University of St. Andrews, St. Andrews, Fife KY16 8LB, UK 2NOAA Fisheries Service/Office of Protected Resources, Marine Mammal Health and Stranding Response Program, 1315 East-West Highway, Silver Spring, Maryland 20910, USA 3Histology Department, Bute Medical School, University of St. Andrews, St. Andrews, Fife KY16 9TS, UK 4MOm/Hellenic Society for the Study and Protection of the Monk Seal, 18 Solomou Street, 106 82 Athens, Greece 5Age Dynamics, Huldbergs Allé 42, Kongens Lyngby, 2800, Denmark ABSTRACT: Mediterranean monk seals Monachus monachus are classified as Critically Endan- gered on the IUCN Red List, with <600 individuals split into 3 isolated sub-populations, the largest in the eastern Mediterranean Sea. Canine teeth collected during the last 2 decades from 45 dead monk seals inhabiting Greek waters were processed for age estimation. Ages were best estimated by counting growth layer groups (GLGs) in the cementum adjacent to the root tip using un - processed longitudinal or transverse sections (360 µm thickness) observed under polarized light. Decalcified and stained thin sections (8 to 23 µm) of both cementum and dentine were inferior to unprocessed sections. From analysing patterns of deposition in the cementum of known age- maturity class individuals, one GLG was found to be deposited annually in M. -
Letter to K. Baker, 1-29-07
Marine Mammal Commission 4340 East-West Highway, Room 905 Bethesda, MD 20814 29January 2007 Mr. Kyle Baker National Marine Fisheries Service 263 13th Avenue, South St. Petersburg, FL 33701 Dear Mr. Baker: The Marine Mammal Commission, in consultation with its Committee of Scientific Advisors on Marine Mammals, has reviewed the National Marine Fisheries Service’s 29 November 2006 Federal Register notice announcing its intent to conduct a review of the Caribbean monk seal, Monachus tropicalis, under the Endangered Species Act and requesting information on the species’ status. We have reviewed our files and, with great regret, we have concluded that the species is extinct and should be removed from the list of endangered and threatened species. Fossil and archeological evidence, along with sighting records, indicate that the species once occurred from the southeastern United States through the Bahamas and the Caribbean Sea. A review of those records by Rice (1973) concluded that the last authoritative sighting was of a small colony of animals at Seranilla Banks between Jamaica and the Yucatan Peninsula in 1952. A few other unconfirmed sightings were reported from the 1950s into the 1970s, but at least some of those were reported to involve escaped California sea lions (Gunter 1968 cited in Rice 1973). Although the species may have been extinct when the Endangered Species Act was passed in 1973, the Marine Mammal Commission wrote to the National Marine Fisheries Service on 26 January 1977 recommending that the Caribbean monk seal be listed as “endangered” under the Endangered Species Act and “depleted” under the Marine Mammal Protection Act. -
MASS TOURISM and the MEDITERRANEAN MONK SEAL
MASS TOURISM and the MEDITERRANEAN MONK SEAL The role of mass tourism in the decline and possible future extinction of Europe’s most endangered marine mammal, Monachus monachus William M. Johnson & David M. Lavigne International Marine Mammal Association 1474 Gordon Street, Guelph, Ontario, Canada N1L 1C8 ABSTRACT Mass tourism has been implicated in the decline of the Mediterranean monk seal (Monachus monachus) since the 1970s, when scientists first began reviewing the global status of the species. Since then, the scientific literature, recognising the inexorable process of disturbance and loss of habitat that this economic and social activity has produced along extensive stretches of Mediterranean coastline, has consistently identified tourism as among the most significant causes of decline affecting this critically-endangered species. Despite apparent consensus on this point, no serious attempt has been made to assess the tourist industry’s role, or to acknowledge and discuss its moral and financial responsibility, in the continuing decline and possible future extinction of M. monachus. In view of this, The Monachus Guardian 2 (2) November 1999 1 we undertook a review of existing literature to identify specific areas in which tourism has impacted the Mediterranean monk seal. Our results provide compelling evidence that mass tourism has indeed played a major role in the extirpation of the monk seal in several European countries, that it continues to act as a significant force of extinction in the last Mediterranean strongholds of the species, and that the industry exerts a generally negative influence on the design and operation of protected areas in coastal marine habitats. There are compelling reasons to conclude that unless the tourist industry can be persuaded to become an active and constructive partner in monk seal conservation initiatives, it will eventually ensure the extinction of the remaining monk seals in the Mediterranean. -
N044p061.Pdf
Vol. 44: 61–78, 2021 ENDANGERED SPECIES RESEARCH Published January 28 https://doi.org/10.3354/esr01092 Endang Species Res OPEN ACCESS Underwater hearing and communication in the endangered Hawaiian monk seal Neomonachus schauinslandi Jillian M. Sills1,*, Kirby Parnell2,3, Brandi Ruscher2, Chloe Lew1, Traci L. Kendall4, Colleen Reichmuth1 1Institute of Marine Sciences, Long Marine Laboratory, University of California Santa Cruz, Santa Cruz, CA 95060, USA 2Department of Ocean Sciences, University of California Santa Cruz, Santa Cruz, CA 95064, USA 3Marine Mammal Research Program, Hawai‘i Institute of Marine Biology, University of Hawai‘i, Kaneohe, HI 96744, USA 4Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA 95064, USA ABSTRACT: Hawaiian monk seals are among the most endangered marine mammals and the most basal of the phocid seals. The auditory biology of monk seals is compelling from behavioral, evolutionary, and conservation perspectives, but we presently lack substantive bioacoustic infor- mation for this species, with no formal descriptions of underwater vocalizations and limited data concerning hearing. These seals have been isolated for more than 10 million yr and have auditory structures differing from those of related species. Additionally, unlike other aquatically mating phocids, monk seals breed asynchronously and are not known to produce social calls in water. To address existing knowledge gaps, we trained a mature male Hawaiian monk seal to perform a psychophysical task while submerged. Detection thresholds were measured for narrowband sounds across the frequency range of hearing. We also conducted a year-round characterization of the seal’s spontaneous underwater vocalizations. This individual demonstrated best hearing between 0.2 and 33 kHz, with a lower high-frequency roll-off than that of related species. -
Diet of a Mediterranean Monk Seal Monachus Monachus in a Transitional Post-Weaning Phase and Its Implications for the Conservation of the Species
Vol. 39: 315–320, 2019 ENDANGERED SPECIES RESEARCH Published August 22 https://doi.org/10.3354/esr00971 Endang Species Res OPENPEN ACCESSCCESS NOTE Diet of a Mediterranean monk seal Monachus monachus in a transitional post-weaning phase and its implications for the conservation of the species Cem Orkun Kıraç1,*, Meltem Ok2 1Underwater Research Society - Mediterranean Seal Research Group (SAD-AFAG), 06570 Ankara, Turkey 2Middle East Technical University - Institute of Marine Science (METU-IMS), Erdemli, 33731 Mersin, Turkey ABSTRACT: The Mediterranean monk seal Monachus monachus is the most endangered pin- niped in the world and is considered Endangered by the IUCN. Transition from suckling to active feeding is a critical time in the development of all mammal species, and understanding the dietary requirements of seals during this vulnerable period is of value in establishing conservation meas- ures, such as fishery regulations. This study provides unique information on the dietary habits of a moulted monk seal pup, through the opportunistic necropsy of a dead animal encountered at a very early age (5 mo). A total of 6 prey items from 2 families (Octopodidae, 90.8% and Congridae, 8.9%) were identified from stomach contents. The remaining stomach content mass consisted of fish bones from unidentified species (0.3%). The estimated age, low diversity and number of prey items in the stomach contents indicate that this individual may have been in a transition period from suckling to active feeding. The study confirms independent foraging in Mediterranean monk seals at about 5 mo of age. Given the importance of early life survival for maintaining stable Medi- terranean monk seal populations, and the occurrence of an ontogenetic shift in its close relative (Hawaiian monk seal), these findings contribute to the establishment and implementation of suc- cessful conservation and management strategies for this Endangered species. -
Īlio-Holo-I-Ka-Uaua Or Hawaiian Monk Seal Neomonachus Schauinslandi
Marine Mammals Īlio-holo-i-ka-uaua or Hawaiian monk seal Neomonachus schauinslandi SPECIES STATUS: Federally Listed as Endangered Courtesy State Listed as Endangered State Recognized as Indigenous and Endemic IUCN Red List – Critically Endangered SPECIES INFORMATION: Īlio-holo-i-ka-uaua, or Hawaiian monk seals, are benthic feeders and feed on reef fishes, octopus, squid, and lobsters over many substrates up to depths of 305 meters (1,000 feet). Juveniles feed on a higher proportion of nocturnal fish species. Food seems to be a limiting factor for population growth. They are usually solitary, except on preferred beaches when they occur in close proximity and interact. Mating occurs in the spring and early summer. Gestation is approximately one year. Pupping occurs in late winter and spring. Weaning lasts five to six weeks, in late spring, and pups and mothers stay ashore until pups are weaned. Foster parenting occurs. Most females breed every other year, but about one-third breed in consecutive years. Sexual maturity occurs at around five to ten years of age, and earliest is at Laysan. Life span is 20 to 25 years of age. These are the only endangered marine mammal that occurs exclusively within the United States. DISTRIBUTION: Occurs in all of the Hawaiian Islands, including a small population in the Main Hawaiian Islands (MHI), although the majority of the population and pupping occurs in the Northwestern Hawaiian Islands (NWHI). ABUNDANCE: The total population is estimated at 1,200 individuals, most of which occur in the NWHI, with a decreasing population trend. About 150 of these seals occur in the MHI, where the population is increasing. -
The Biology of Marine Mammals
Romero, A. 2009. The Biology of Marine Mammals. The Biology of Marine Mammals Aldemaro Romero, Ph.D. Arkansas State University Jonesboro, AR 2009 2 INTRODUCTION Dear students, 3 Chapter 1 Introduction to Marine Mammals 1.1. Overture Humans have always been fascinated with marine mammals. These creatures have been the basis of mythical tales since Antiquity. For centuries naturalists classified them as fish. Today they are symbols of the environmental movement as well as the source of heated controversies: whether we are dealing with the clubbing pub seals in the Arctic or whaling by industrialized nations, marine mammals continue to be a hot issue in science, politics, economics, and ethics. But if we want to better understand these issues, we need to learn more about marine mammal biology. The problem is that, despite increased research efforts, only in the last two decades we have made significant progress in learning about these creatures. And yet, that knowledge is largely limited to a handful of species because they are either relatively easy to observe in nature or because they can be studied in captivity. Still, because of television documentaries, ‘coffee-table’ books, displays in many aquaria around the world, and a growing whale and dolphin watching industry, people believe that they have a certain familiarity with many species of marine mammals (for more on the relationship between humans and marine mammals such as whales, see Ellis 1991, Forestell 2002). As late as 2002, a new species of beaked whale was being reported (Delbout et al. 2002), in 2003 a new species of baleen whale was described (Wada et al. -
HAWAIIAN MONK SEAL (Neomonachus Schauinslandi)
Revised 12/31/2015 HAWAIIAN MONK SEAL (Neomonachus schauinslandi) STOCK DEFINITION AND GEOGRAPHIC RANGE Hawaiian monk seals are distributed throughout the Northwestern Hawaiian Islands (NWHI), with subpopulations at French Frigate Shoals, Laysan Island, Lisianski Island, Pearl and Hermes Reef, Midway Atoll, Kure Atoll, and Necker and Nihoa Islands. They also occur throughout the main Hawaiian Islands (MHI). Genetic variation among monk seals is extremely low and may reflect a long-term history at low population levels and more recent human influences (Kretzmann et al. 1997, 2001, Schultz et al. 2009). Though monk seal subpopulations often exhibit asynchronous variation in demographic parameters (such as abundance trends and survival rates), they are connected by animal movement throughout the species’ range (Johanos et al. 2013). Genetic analysis (Schultz et al. 2011) indicates the species is a single panmictic population. The Hawaiian monk seal is therefore considered a single stock. Scheel et al. (2014) established a new genus, Neomonachus, comprising the Caribbean and Hawaiian monk seals, based upon molecular and skull morphology evidence. POPULATION SIZE The best estimate of the total population size is 1,112. This estimate is the sum of estimated abundance at the six main Northwestern Hawaiian Islands subpopulations, an extrapolation of counts at Necker and Nihoa Islands, and an estimate of minimum abundance in the main Hawaiian Islands. In 2013, for the second consecutive year, NWHI field camps were shorter in duration relative to historic field effort levels. The low effort at some sites certainly resulted in negatively-biased abundance estimates and a degradation of the long-term monk seal demographic database.