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Ocean dispersal modelling for propagules of pond apple (Annona glabra L.)

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Mason, L.B., Setter, M.J., Setter, S.D., Hardy, T. and Graham, M.F. (2008) Ocean dispersal modelling for propagules of pond apple (Annona glabra L.). In: Proceedings of the 16th Australian Weeds Conference, 18-22 May 2008, Cairns, Queensland.

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Publisher URL: http://www.weedinfo.com.au/
Organisation URL: http://www.weedinfo.com.au/bk_16awc.html


Pond apple invades riparian and coastal environments with water acting as the main vector for dispersal. As seeds float and can reach the ocean, a seed tracking model driven by near surface ocean currents was used to develop maps of potential seed dispersal. Seeds were ‘released’ in the model from sites near the mouths of major North Queensland rivers. Most seeds reach land within three months of release, settling predominately on windward-facing locations. During calm and monsoonal conditions, seeds were generally swept in a southerly direction, however movement turns northward during south easterly trade winds. Seeds released in February from the Johnstone River were capable of being moved anywhere from 100 km north to 150 km south depending on prevailing conditions. Although wind driven currents are the primary mechanism influencing seed dispersal, tidal currents, the East Australian Current, and other factors such as coastline orientation, release location and time also play an important role in determining dispersal patterns. In extreme events such as tropical cyclone Justin in 1997, north east coast rivers could potentially transport seed over 1300 km to the Torres Strait, Papua New Guinea and beyond.

Item Type:Conference or Workshop Item (Paper)
Corporate Creators:QPIF
Additional Information:© R.G. and F.J. Richardson.
Keywords:Annona glabra L.; pond apple.
Subjects:Science > Invasive Species > Plants > Weed ecology
Science > Invasive Species > Modelling > Plant
Live Archive:14 Jul 2009 06:01
Last Modified:03 Sep 2021 16:48

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