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Kolonisation in fen ponds

Kolonisation in fen ponds. Judith Sarneel Utrecht University. Chara Stratiotes Menyanthes. Dramatic decrease of typical fen species Water quality improved Why are there no new colonisation events?. 1. Propagules entering the water. >6 floating fen. 2. (long)distance dispersal by water.

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Kolonisation in fen ponds

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  1. Kolonisation in fen ponds Judith Sarneel Utrecht University

  2. Chara Stratiotes Menyanthes Dramatic decrease of typical fen speciesWater quality improvedWhy are there no new colonisation events?

  3. 1. Propagules entering the water >6 floating fen 2. (long)distance dispersal by water 3.deposition 5.Clonal expansion 4a.Incorporation in the seedbank ZZZZ 4b.Germination and establishment Colonisation

  4. Dispersal: What is mechanism, what are the effects? Main wind direction SouthWest Isolated ponds currents by wind hydrochory => wind driven

  5. exposure Lee, SW Wind, NE p=0.006 exposure Lee, SW Wind, NE 12000 8000 Diaspores per mat Wind direction 4000 0 Nov-06 Feb-07 may-07 Aug-07 Nov-07

  6. But: The desired species typically grow in sites sheltered from the wind, whereas the majority of seeds are transported to exposed banks. Azza, et al 2007

  7. Can this difference be explained by differences in germination and establishment? Comarum palustris Glyceria maxima Calla palustris Mentha aquatica Berula erecta

  8. SW NE At first more seedlings at downwind sites =>light Later on, highest numbers at lee, upwind sites Steeper decrease at NE banks =>waves

  9. WIND Waves

  10. Under which circumstances do species colonise the water from the bank? What is the effect of eutrophication on the colonisation of fen ponds? Clonal expansion

  11. We will relate all kinds of environmental variables (chemical, morphological, management) To: The colonised distance as measured in the field

  12. April Mei Juni Juli September Juni 2006 Sept 2007 Mesocosm experiment with different nutrient treatments to water and peat

  13. Met dank aan:

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