Vortrag von Prof. Daniel Pauly bei der zweiten Thienmann Vorlesung am IGB

Fischbiologie, Fischereiökologie

Hiermit laden wir Sie recht herzlich zum 2. Thienmann-Vortrag am IGB, der am 20. Juni um 13 Uhr im Hörsaal des IGB, Müggelseedamm 310, 12597 Berlin (www.igb-berlin.de) stattfindet, ein.

Unser prominenter Referent ist Prof. Daniel Pauly von der University of British Columbia, Kanada. Daniel Pauly ist der meist zitierte Fisch- und Fischereiforscher auf dem Globus. Er ist wahrscheinlich am besten für seine Beiträge zur globalen Fischereikrise (z. B. "Fischerei im Nahrungsnetz"), für die Entwicklung der trophischen Massenbilanz von Ökosystemen "Ecopath" und der globalen Fischinformationsdatenbank www.fishbase.org bekannt. Daniel Pauly erhielt zahlreiche Auszeichnungen, darunter den Volvo Environmental Prize. Er hat über 1000 Artikel veröffentlicht und wurde mehr als 80.000 Mal zitiert. Mehr Informationen zu Daniel Paulys beeindruckenden Leistungen finden Sie unter folgenden Links:
https://scholar.google.ca/citations?user=b6s1NfkAAAAJ&hl=en und http://oceans.ubc.ca/daniel-pauly/

 

Thema seines Vortrages wird sein: "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 shrinking 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 recently challenged, 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 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; (8) why fish perform temperature-driven seasonal migrations (9) why global warming induces 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  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 acceleration progress in marine biology and limnology and the corresponding applied discipline, i.e., fishery science and aquaculture.


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