• A personal note on IGBP and the social sciences

    Humans are an integral component of the Earth system as conceptualised by IGBP. João Morais recalls key milestones in IGBP’s engagement with the social sciences and offers some words of advice for Future Earth.
  • IGBP and Earth observation:
    a co-evolution

    The iconic images of Earth beamed back by the earliest spacecraft helped to galvanise interest in our planet’s environment. The subsequent evolution and development of satellites for Earth observation has been intricately linked with that of IGBP and other global-change research programmes, write Jack Kaye and Cat Downy .

An overview of the Southern Ocean Global Ocean Ecosystem Dynamics Program

Deep Sea Research II (2004)
Hofmann E E, Wiebe P H, Costs D P and Torres J J (eds)
Doi: 10.1016/j.dsr2.2004.08.007
Vol 51; Nos 17-19; pp. 1921-1924

Along the Moroccan coasts, the systematic status of Mytilus populations have been for a long time uncertain and confused, due to the use of unreliable morphometric criteria. In the present study, allozyme markers reveal the exclusive existence of M. galloprovincialis on Mediterranean and Atlantic coasts. Nei's genetic distances are low and reflect a high gene flow between Atlantic and Mediterranean populations. However, a significant multilocus discontinuity revealed by F-statistics separate southern Atlantic populations from Mediterranean and north Atlantic ones and could be explained by a gene flow breaking because of a larval dispersal decrease, due to a sea surface current direction change from Cap Ghir towards the Canaries archipelago, and probably by differential selection effects in these two geographic areas.Original Abstract: Au Maroc, la systematique du genre Mytilus est restee pendant longtemps confuse et incertaine, en raison de l'utilisation de caracteres morphometriques peu fiables. Dans le present travail, l'utilisation des marqueurs allozymiques montre la presence exclusive de Mytilus galloprovincialis en Mediterranee et dans l'Atlantique. Les faibles valeurs de distance genetique obtenues refletent un flux genique important entre les populations atlantiques et mediterraneennes. Cependant, une differenciation multilocus nette prouvee par le parametre Fst existe entre les populations atlantiques localisees au sud du cap Ghir et celles situees plus au nord et en Mediterranee. Cette divergence pourrait s'expliquer par une selection differentielle dans ces deux zones et /ou par le changement du sens du courant de surface, principal moyen de dispersion larvaire, qui s'oriente vers l'archipel des Canaries, d'o une rupture possible du flux genique.

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