A “Living Fossil,” the Coelacanth (Latimeria Chalumnae)
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RESPIRATORY CONTROL in the LUNGFISH, NEOCERATODUS FORSTERI (KREFT) KJELL JOHANSEN, CLAUDE LENFANT and GORDON C
Comp. Biochem. Physiol., 1967, Vol. 20, pp. 835-854 RESPIRATORY CONTROL IN THE LUNGFISH, NEOCERATODUS FORSTERI (KREFT) KJELL JOHANSEN, CLAUDE LENFANT and GORDON C. GRIGG Abstract-1. Respiratory control has been studied in the lungfish, Neoceratodus forsteri by measuring ventilation (Ve), oxygen uptake (VO2), per cent O2 extraction from water, breathing rates of branchial and aerial respiration and changes in blood gas and pulmonary gas composition during exposure to hypoxia and hypercarbia. 2. Hypoxic water represents a strong stimulus for compensatory increase in both branchial and aerial respiration. Water ventilation increases by a factor of 3 or 4 primarily as a result of increased depth of breathing. 3. The ventilation perfusion ratio decreased during hypoxia because of a marked increase in cardiac output. Hypoxia also increased the fraction of total blood flow perfusing the lung. Injection of nitrogen into the lung evoked no compensatory changes. 4. It is concluded that the chemoreceptors eliciting the compensatory changes are located on the external side facing the ambient water or in the efferent branchial blood vessels. 5. Elevated pCO2 in the ambient water depressed the branchial respiration but stimulated aerial respiration. 6. It is suggested that the primary regulatory effect of the response to increased ambient pCO2 is to prevent CO2 from entering the animal, while the secondary stimulation of air breathing is caused by hypoxic stimulation of chemoreceptors located in the efferent branchial vessels. INTRODUCTION I t i s generally accepted that vertebrates acquired functional lungs before they possessed a locomotor apparatus for invasion of a terrestrial environment. Shortage of oxygen in the environment is thought to have been the primary driving force behind the development of auxiliary air breathing. -
ESS 345 Ichthyology
ESS 345 Ichthyology Evolutionary history of fishes 12 Feb 2019 (Who’s birthday?) Quote of the Day: We must, however, acknowledge, as it seems to me, that man with all his noble qualities... still bears in his bodily frame the indelible stamp of his lowly origin._______, (1809-1882) Evolution/radiation of fishes over time Era Cenozoic Fig 13.1 Fishes are the most primitive vertebrate and last common ancestor to all vertebrates They start the branch from all other living things with vertebrae and a cranium Chordata Notochord Dorsal hollow nerve cord Pharyngeal gill slits Postanal tail Urochordata Cephalochordata Craniates (mostly Vertebrata) Phylum Chordata sister is… Echinodermata Synapomorphy – They are deuterostomes Fish Evolutionary Tree – evolutionary innovations in vertebrate history Sarcopterygii Chondrichthyes Actinopterygii (fish) For extant fishes Osteichthyes Gnathostomata Handout Vertebrata Craniata Figure only from Berkeley.edu Hypothesis of fish (vert) origins Background 570 MYA – first large radiation of multicellular life – Fossils of the Burgess Shale – Called the Cambrian explosion Garstang Hypothesis 1928 Neoteny of sessile invertebrates Mistake that was “good” Mudpuppy First Vertebrates Vertebrates appear shortly after Cambrian explosion, 530 MYA – Conodonts Notochord replaced by segmented or partially segmented vertebrate and brain is enclosed in cranium Phylogenetic tree Echinoderms, et al. Other “inverts” Vertebrate phyla X Protostomes Deuterostomes Nephrozoa – bilateral animals First fishes were jawless appearing -
The MBL Model and Stochastic Paleontology
216 Chapter seven ised exciting new avenues for research, that insights from biology and ecology could more profi tably be applied to paleontology, and that the future lay in assembling large databases as a foundation for analysis of broad-scale patterns of evolution over geological history. But in compar- ison to other expanding young disciplines—like theoretical ecology— paleobiology lacked a cohesive theoretical and methodological agenda. However, over the next ten years this would change dramatically. Chapter Seven One particular ecological/evolutionary issue emerged as the central unifying problem for paleobiology: the study and modeling of the his- “Towards a Nomothetic tory of diversity over time. This, in turn, motivated a methodological question: how reliable is the fossil record, and how can that reliability be Paleontology”: The MBL Model tested? These problems became the core of analytical paleobiology, and and Stochastic Paleontology represented a continuation and a consolidation of the themes we have examined thus far in the history of paleobiology. Ultimately, this focus led paleobiologists to groundbreaking quantitative studies of the inter- The Roots of Nomotheticism play of rates of origination and extinction of taxa through time, the role of background and mass extinctions in the history of life, the survivor- y the early 1970s, the paleobiology movement had begun to acquire ship of individual taxa, and the modeling of historical patterns of diver- Bconsiderable momentum. A number of paleobiologists began ac- sity. These questions became the central components of an emerging pa- tively building programs of paleobiological research and teaching at ma- leobiological theory of macroevolution, and by the mid 1980s formed the jor universities—Stephen Jay Gould at Harvard, Tom Schopf at the Uni- basis for paleobiologists’ claim to a seat at the “high table” of evolution- versity of Chicago, David Raup at the University of Rochester, James ary theory. -
Chordates (Phylum Chordata)
A short story Leathem Mehaffey, III, Fall 201993 The First Chordates (Phylum Chordata) • Chordates (our phylum) first appeared in the Cambrian, 525MYA. 94 Invertebrates, Chordates and Vertebrates • Invertebrates are all animals not chordates • Generally invertebrates, if they have hearts, have dorsal hearts; if they have a nervous system it is usually ventral. • All vertebrates are chordates, but not all chordates are vertebrates. • Chordates: • Dorsal notochord • Dorsal nerve chord • Ventral heart • Post-anal tail • Vertebrates: Amphioxus: archetypal chordate • Dorsal spinal column (articulated) and skeleton 95 Origin of the Chordates 96 Haikouichthys Myllokunmingia Note the rounded extension to Possibly the oldest the head bearing sensory vertebrate: showed gill organs bars and primitive vertebral elements Early and primitive agnathan vertebrates of the Early Cambrian (530MYA) Pikaia Note: these organisms were less Primitive chordate, than an inch long. similar to Amphioxus 97 The Cambrian/Ordovician Extinction • Somewhere around 488 million years ago something happened to cause a change in the fauna of the earth, heralding the beginning of the Ordovician Period. • Rather than one catastrophe, the late-Cambrian extinction seems to be a series of smaller extinction events. • Historically the change in fauna (mostly trilobites as the index species) was thought to be due to excessive warmth and low oxygen. • But some current findings point to an oxygen spike due perhaps to continental drift into the tropics, driving rapid speciation and consequent replacement of old with new organisms. 98 Welcome to the Ordovician YOU ARE HERE 99 The Ordovician Sea, 488 million years 100 ago The Ordovician Period lasted almost 45 million years, from 489 to 444 MYA. -
Sight for Sore Eyes: Ancient Fish See Colour 19 September 2005
Sight for sore eyes: ancient fish see colour 19 September 2005 The Australian lungfish - one of the world’s oldest pigments, are bigger in lungfish than for any other fishes and related to our ancient ancestors - may animal with a backbone. This probably makes them have been viewing rivers in technicolour long more sensitive to light. before dinosaurs roamed the Earth. “We keep discovering ways in which these animals Recent work by postgraduate student Helena are quite different from other fish,” Helena says. Bailes at the University of Queensland Australia, “Their eyes seem designed to optimise both has found these unusual fish have genes for five sensitivity and colour vision with large cells different forms of visual pigment in their eyes. containing different visual pigments.” Humans only have three. She now is hoping that behavioural research can Helena is one of 13 early-career researchers who find out how these fish are using their eyes for have presented their work to the public and the colour vision in the wild. media for the first time as part of the national program Fresh Science. “We may then learn what Queensland rivers look like to some of their oldest inhabitants, before those Night and day (colour) vision are controlled by inhabitants are wiped out,” Bailes says. different light sensing cells known respectively as rods and cones. Humans have a single type of rod and three types of cone, each containing a different pigment gene tuned to red, green and blue wavelengths. Lungfish possess two additional pigments that were lost in mammals, Bailes says. -
Coelacanth Discoveries in Madagascar, with AUTHORS: Andrew Cooke1 Recommendations on Research and Conservation Michael N
Coelacanth discoveries in Madagascar, with AUTHORS: Andrew Cooke1 recommendations on research and conservation Michael N. Bruton2 Minosoa Ravololoharinjara3 The presence of populations of the Western Indian Ocean coelacanth (Latimeria chalumnae) in AFFILIATIONS: 1Resolve sarl, Ivandry Business Madagascar is not surprising considering the vast range of habitats which the ancient island offers. Center, Antananarivo, Madagascar The discovery of a substantial population of coelacanths through handline fishing on the steep volcanic 2Honorary Research Associate, South African Institute for Aquatic slopes of Comoros archipelago initially provided an important source of museum specimens and was Biodiversity, Makhanda, South Africa the main focus of coelacanth research for almost 40 years. The advent of deep-set gillnets, or jarifa, for 3Resolve sarl, Ivandry Business catching sharks, driven by the demand for shark fins and oil from China in the mid- to late 1980s, resulted Center, Antananarivo, Madagascar in an explosion of coelacanth captures in Madagascar and other countries in the Western Indian Ocean. CORRESPONDENCE TO: We review coelacanth catches in Madagascar and present evidence for the existence of one or more Andrew Cooke populations of L. chalumnae distributed along about 1000 km of the southern and western coasts of the island. We also hypothesise that coelacanths are likely to occur around the whole continental margin EMAIL: [email protected] of Madagascar, making it the epicentre of coelacanth distribution in the Western Indian Ocean and the likely progenitor of the younger Comoros coelacanth population. Finally, we discuss the importance and DATES: vulnerability of the population of coelacanths inhabiting the submarine slopes of the Onilahy canyon in Received: 23 June 2020 Revised: 02 Oct. -
Multiple Molecular Evidences for a Living Mammalian Fossil
Multiple molecular evidences for a living mammalian fossil Dorothe´ e Huchon†‡, Pascale Chevret§¶, Ursula Jordanʈ, C. William Kilpatrick††, Vincent Ranwez§, Paulina D. Jenkins‡‡, Ju¨ rgen Brosiusʈ, and Ju¨ rgen Schmitz‡ʈ †Department of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 69978, Israel; §Department of Paleontology, Phylogeny, and Paleobiology, Institut des Sciences de l’Evolution, cc064, Universite´Montpellier II, Place E. Bataillon, 34095 Montpellier Cedex 5, France; ʈInstitute of Experimental Pathology, University of Mu¨nster, D-48149 Mu¨nster, Germany; ††Department of Biology, University of Vermont, Burlington, VT 05405-0086; and ‡‡Department of Zoology, The Natural History Museum, London SW7 5BD, United Kingdom Edited by Francisco J. Ayala, University of California, Irvine, CA, and approved March 18, 2007 (received for review February 11, 2007) Laonastes aenigmamus is an enigmatic rodent first described in their classification as a diatomyid suggests that Laonastes is a 2005. Molecular and morphological data suggested that it is the living fossil and a ‘‘Lazarus taxon.’’ sole representative of a new mammalian family, the Laonastidae, The two research teams also disagreed on the taxonomic and a member of the Hystricognathi. However, the validity of this position of Laonastes. According to Jenkins et al. (2), Laonastes family is controversial because fossil-based phylogenetic analyses is either the most basal group of the hystricognaths (Fig. 2A)or suggest that Laonastes is a surviving member of the Diatomyidae, nested within the hystricognaths (Fig. 2B). According to Dawson a family considered to have been extinct for 11 million years. et al. (3), Laonastes and the other Diatomyidae are the sister According to these data, Laonastes and Diatomyidae are the sister clade of the family Ctenodactylidae (i.e., gundies), a family that clade of extant Ctenodactylidae (i.e., gundies) and do not belong does not belong to the Hystricognathi, but to which it is to the Hystricognathi. -
New York Ocean Action Plan 2016 – 2026
NEW YORK OCEAN ACTION PLAN 2016 – 2026 In collaboration with state and federal agencies, municipalities, tribal partners, academic institutions, non- profits, and ocean-based industry and tourism groups. Acknowledgments The preparation of the content within this document was developed by Debra Abercrombie and Karen Chytalo from the New York State Department of Environmental Conservation and in cooperation and coordination with staff from the New York State Department of State. Funding was provided by the New York State Environmental Protection Fund’s Ocean & Great Lakes Program. Other New York state agencies, federal agencies, estuary programs, the New York Ocean and Great Lakes Coalition, the Shinnecock Indian Nation and ocean-based industry and user groups provided numerous revisions to draft versions of this document which were invaluable. The New York Marine Sciences Consortium provided vital recommendations concerning data and research needs, as well as detailed revisions to earlier drafts. Thank you to all of the members of the public and who participated in the stakeholder focal groups and for also providing comments and revisions. For more information, please contact: Karen Chytalo New York State Department of Environmental Conservation [email protected] 631-444-0430 Cover Page Photo credits, Top row: E. Burke, SBU SoMAS, M. Gove; Bottom row: Wolcott Henry- 2005/Marine Photo Bank, Eleanor Partridge/Marine Photo Bank, Brandon Puckett/Marine Photo Bank. NEW YORK OCEAN ACTION PLAN | 2016 – 2026 i MESSAGE FROM COMMISSIONER AND SECRETARY The ocean and its significant resources have been at the heart of New York’s richness and economic vitality, since our founding in the 17th Century and continues today. -
BMC Ecology Biomed Central
BMC Ecology BioMed Central Research article Open Access Visual ecology of the Australian lungfish (Neoceratodus forsteri) Nathan S Hart*1, Helena J Bailes1,2, Misha Vorobyev1,3, N Justin Marshall1 and Shaun P Collin1 Address: 1School of Biomedical Sciences, The University of Queensland, Brisbane, QLD 4072, Australia, 2Faculty of Life Sciences, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK and 3Department of Optometry and Vision Science, The University of Auckland, Private Bag 92019, Auckland, New Zealand Email: Nathan S Hart* - [email protected]; Helena J Bailes - [email protected]; Misha Vorobyev - [email protected]; N Justin Marshall - [email protected]; Shaun P Collin - [email protected] * Corresponding author Published: 18 December 2008 Received: 27 August 2008 Accepted: 18 December 2008 BMC Ecology 2008, 8:21 doi:10.1186/1472-6785-8-21 This article is available from: http://www.biomedcentral.com/1472-6785/8/21 © 2008 Hart et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract Background: The transition from water to land was a key event in the evolution of vertebrates that occurred over a period of 15–20 million years towards the end of the Devonian. Tetrapods, including all land-living vertebrates, are thought to have evolved from lobe-finned (sarcopterygian) fish that developed adaptations for an amphibious existence. -
Tetrapod Limb and Sarcopterygian Fin Regeneration Share a Core Genetic
ARTICLE Received 28 Apr 2016 | Accepted 27 Sep 2016 | Published 2 Nov 2016 DOI: 10.1038/ncomms13364 OPEN Tetrapod limb and sarcopterygian fin regeneration share a core genetic programme Acacio F. Nogueira1,*, Carinne M. Costa1,*, Jamily Lorena1, Rodrigo N. Moreira1, Gabriela N. Frota-Lima1, Carolina Furtado2, Mark Robinson3, Chris T. Amemiya3,4, Sylvain Darnet1 & Igor Schneider1 Salamanders are the only living tetrapods capable of fully regenerating limbs. The discovery of salamander lineage-specific genes (LSGs) expressed during limb regeneration suggests that this capacity is a salamander novelty. Conversely, recent paleontological evidence supports a deeper evolutionary origin, before the occurrence of salamanders in the fossil record. Here we show that lungfishes, the sister group of tetrapods, regenerate their fins through morphological steps equivalent to those seen in salamanders. Lungfish de novo transcriptome assembly and differential gene expression analysis reveal notable parallels between lungfish and salamander appendage regeneration, including strong downregulation of muscle proteins and upregulation of oncogenes, developmental genes and lungfish LSGs. MARCKS-like protein (MLP), recently discovered as a regeneration-initiating molecule in salamander, is likewise upregulated during early stages of lungfish fin regeneration. Taken together, our results lend strong support for the hypothesis that tetrapods inherited a bona fide limb regeneration programme concomitant with the fin-to-limb transition. 1 Instituto de Cieˆncias Biolo´gicas, Universidade Federal do Para´, Rua Augusto Correa, 01, Bele´m66075-110,Brazil.2 Unidade Genoˆmica, Programa de Gene´tica, Instituto Nacional do Caˆncer, Rio de Janeiro 20230-240, Brazil. 3 Benaroya Research Institute at Virginia Mason, 1201 Ninth Avenue, Seattle, Washington 98101, USA. 4 Department of Biology, University of Washington 106 Kincaid, Seattle, Washington 98195, USA. -
The African Coelacanth Genome Provides Insights Into Tetrapod Evolution
OPEN ARTICLE doi:10.1038/nature12027 The African coelacanth genome provides insights into tetrapod evolution Chris T. Amemiya1,2*, Jessica Alfo¨ldi3*, Alison P. Lee4, Shaohua Fan5, Herve´ Philippe6, Iain MacCallum3, Ingo Braasch7, Tereza Manousaki5,8, Igor Schneider9, Nicolas Rohner10, Chris Organ11, Domitille Chalopin12, Jeramiah J. Smith13, Mark Robinson1, Rosemary A. Dorrington14, Marco Gerdol15, Bronwen Aken16, Maria Assunta Biscotti17, Marco Barucca17, Denis Baurain18, Aaron M. Berlin3, Gregory L. Blatch14,19, Francesco Buonocore20, Thorsten Burmester21, Michael S. Campbell22, Adriana Canapa17, John P. Cannon23, Alan Christoffels24, Gianluca De Moro15, Adrienne L. Edkins14, Lin Fan3, Anna Maria Fausto20, Nathalie Feiner5,25, Mariko Forconi17, Junaid Gamieldien24, Sante Gnerre3, Andreas Gnirke3, Jared V. Goldstone26, Wilfried Haerty27, Mark E. Hahn26, Uljana Hesse24, Steve Hoffmann28, Jeremy Johnson3, Sibel I. Karchner26, Shigehiro Kuraku5{, Marcia Lara3, Joshua Z. Levin3, Gary W. Litman23, Evan Mauceli3{, Tsutomu Miyake29, M. Gail Mueller30, David R. Nelson31, Anne Nitsche32, Ettore Olmo17, Tatsuya Ota33, Alberto Pallavicini15, Sumir Panji24{, Barbara Picone24, Chris P. Ponting27, Sonja J. Prohaska34, Dariusz Przybylski3, Nil Ratan Saha1, Vydianathan Ravi4, Filipe J. Ribeiro3{, Tatjana Sauka-Spengler35, Giuseppe Scapigliati20, Stephen M. J. Searle16, Ted Sharpe3, Oleg Simakov5,36, Peter F. Stadler32, John J. Stegeman26, Kenta Sumiyama37, Diana Tabbaa3, Hakim Tafer32, Jason Turner-Maier3, Peter van Heusden24, Simon White16, Louise Williams3, Mark Yandell22, Henner Brinkmann6, Jean-Nicolas Volff12, Clifford J. Tabin10, Neil Shubin38, Manfred Schartl39, David B. Jaffe3, John H. Postlethwait7, Byrappa Venkatesh4, Federica Di Palma3, Eric S. Lander3, Axel Meyer5,8,25 & Kerstin Lindblad-Toh3,40 The discovery of a living coelacanth specimen in 1938 was remarkable, as this lineage of lobe-finned fish was thought to have become extinct 70 million years ago. -
Science Journals
SCIENCE ADVANCES | RESEARCH ARTICLE OCEANOGRAPHY Copyright © 2020 The Authors, some rights reserved; Algal plankton turn to hunting to survive and recover exclusive licensee American Association from end-Cretaceous impact darkness for the Advancement Samantha J. Gibbs1*†, Paul R. Bown2†, Ben A. Ward1†, Sarah A. Alvarez3,2, Hojung Kim2, of Science. No claim to 2‡ 4 5 6 7 original U.S. Government Odysseas A. Archontikis , Boris Sauterey , Alex J. Poulton , Jamie Wilson , Andy Ridgwell Works. Distributed under a Creative The end-Cretaceous bolide impact triggered the devastation of marine ecosystems. However, the specific kill Commons Attribution mechanism(s) are still debated, and how primary production subsequently recovered remains elusive. We used NonCommercial marine plankton microfossils and eco-evolutionary modeling to determine strategies for survival and recovery, License 4.0 (CC BY-NC). finding that widespread phagotrophy (prey ingestion) was fundamental to plankton surviving the impact and also for the subsequent reestablishment of primary production. Ecological selectivity points to extreme post- impact light inhibition as the principal kill mechanism, with the marine food chain temporarily reset to a bacteria- dominated state. Subsequently, in a sunlit ocean inhabited by only rare survivor grazers but abundant small prey, it was mixotrophic nutrition (autotrophy and heterotrophy) and increasing cell sizes that enabled the eventual reestablishment of marine food webs some 2 million years later. Downloaded from INTRODUCTION evidence suggest that at least partial recovery occurred quickly The asteroid impact at the Cretaceous-Paleogene (K/Pg) boundary (years to tens of years), with ubiquitous, prokaryotic cyanobacteria 66 million years (Ma) ago triggered a cascading mass extinction through likely being the main primary producers as light levels improved http://advances.sciencemag.org/ the entirety of the global food web that occurred in a geological in- (4, 12–14).