25.5.18 | Nach seinem erfolgreichen Vortrag in der Reihe »Bremen Earth and Social Science Talks« im vergangenen Juni wird Daniel Pauly am 30. Mai erneut ein willkommener Gast am ZMT sein. Diesmal reist er im Rahmen des LFA- Workshops an und hält am 30. Mai einen öffentlichen Vortrag am Institut. Um 9 Uhr wird der preisgekrönte Meeresbiologie referieren über die Auswirkungen von Temperatur und gelöster Sauerstoff auf den Körperbau und die Größe von Fischen auswirkt. Im Mittelpunkt des Talks "Fish must breathe: How temperature and dissolved oxygen shape their biology" unter anderem auch die Gill-Sauerstoff-Limitationstheorie (GOLT) - siehe Abstract unten.
Titel: "Fish must breathe: How temperature and dissolved oxygen shape their biology" von Prof. Daniel Pauly, University of British Columbia, Kanada
Datum: Mittwoch, 30. Mai 2018
Uhrzeit: 9:00 - 10:00 Uhr
Ort: Großer Seminarrraum, Leibniz-Zentrum für Marine Tropenforschung (ZMT), Fahrenheitstr. 6, 28359 Bremen
Zur Person:
Daniel Pauly ist Professor am Institute of Oceans and Fisheries University of British Columbia in Vancouver (Kanada) und Leiter der Forschungsinitiative „Sea Around Us“. Als Wissenschaftler widmet er sich dem Studium, der Dokumentation und der Förderung von Richtlinien, die den Einfluss von Fischerei auf die marinen Ökosysteme der Welt mindern sollen. Seine Konzepte und Methoden sind in mehr als 1.000 Veröffentlichungen dokumentiert. Paulys Arbeit wurde vielfach ausgezeichnet unter anderem mit dem International Cosmos Preis, dem Volvo Environmental Preis, dem Ramon Margalef Preis und dem Peter Benchley Award.
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Fish must breathe: How temperature and dissolved oxygen shape their biology
Abstract
One of the expected responses of marine fishes to ocean warming is decrease in body size, as supported by evidence from empirical data and theoretical modelling. The theoretical underpinning for fish to shrink is that the oxygen supply to large fish size cannot be met by their gills, whose surface area cannot keep up with the oxygen demand by their three-dimensional bodies. Although this logic has been challenged by some, it will be shown, in the context of Gill-Oxygen Limitation Theory (GOLT) that gills, because they must retain the properties of open surfaces, cannot avoid being limiting for fish growth. Also, besides explaining (1) the growth patterns of fish, a wide range of biological features of fish and other water-breathing organisms can be understood only when gill area limitation is used as an explanation, including (2) the decline of food conversion efficiency with size; (3) the determination of size at which they reproduce; (4) the phenomenon known as ‘abortive maturation’; (5) why the fish of a given species are larger at the cold end of their distribution ranges; (6) why fish move into deeper/colder waters when they grow bigger; (7) why the growth and food conversion efficiency of farmed fish declines when oxygen supply is reduced in ponds; (8) why fish perform temperature-driven seasonal migrations (9) why global warming induced poleward migrations; (10) why the flesh of tuna that have fought for a long time at the end of a fishing line becomes inedible; (11) why the otoliths of fish and the statoliths of invertebrates form clear daily rings in larvae and juveniles, but not in adults; (12) many other phenomena that are never ben elucidated before, or even perceived as requiring an explanation. The GOLT thus appears to have the potential of a powerful theory capable of accelerating progress in marine biology and limnology and the corresponding applied discipline, i.e., fishery science and aquaculture.
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