Muurflora langs kademuren in Haarlem
Transcript of Muurflora langs kademuren in Haarlem
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Muurflora langs kademuren in Haarlem
Flitspresentatie FLORON‐dag10 december 2016
Marco van [email protected]
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Varens langs kademuren in Haarlem, centrum en omgeving1989/'90 1997/'98 2010 2.015 opmerking
Koningsvaren Osmunda regalis 1 op houtMoerasvaren Thelypteris palustris 2 1 1Tongvaren Asplenium scolopendrium 8 555 914Steenbreekvaren Asplenium trichomanes 36 232 442Muurvaren Asplenium ruta‐muraria 1.505 ++ 14.344Zwartsteel Asplenium adiantum‐nigrum (1)* 419 800 ‘00‐’05: 600 expl.Schubvaren Ceterach officinarum 9Wijfjesvaren Athyrium filix‐femina 2 1 7Blaasvaren Cystopteris fragilis 85 18 118Stijve naaldvaren Polystichum aculeatum 1Zachte naaldvaren Polystichum setiferum 1Glansschildvaren Polystichum polyblepharum 1
Polystichum cf tsus‐simense 1Mannetjesvaren Dryopteris filix‐mas 446 ++ 420Geschubde mannetjesvaren Dryopteris affinis 3Brede stekelvaren Dryopteris dilatata 1 1 op houtSmalle stekelvaren Dryopteris carthusiana 9 5 40 24 expl. op houtGewone ijzervaren Cyrtomium falcatum 2 22 6 2002: 23 expl.Gebogen driehoeksvaren Gymnocarpium dryopteris 1Eikvarens (incl. spec.) Polypodium 390 1.298Gewone eikvaren Polypodium vulgare ++ ++ 417Brede eikvaren Polypodium interjectum ++ ++ 681Bastaard eikvaren Polypodium x mantoniae 2 toevallige vondst
aantal soorten 21 12 12 18
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Gewone eikvarenn=417
Brede eikvarenn=681
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Groeiseizoen duurt 26 dagen langer afgelopen 15 jaar vergeleken met vijftig jaar geleden (Natuurkalender, Nature Today)
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Muurvaren14.344 expl.
Steenbreekvaren442 expl.
Tongvaren914 expl.
Zwartsteel800 expl.
Substraat en expositieVoorbeeld: kademuren
Stel: evenredige verdeling van muurtype en expositie over de kademuren
Baksteen en basalt in en om het centrum
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Mannetjesvaren420 expl.
Brede eikvaren681 expl.
Gewone eikvaren417 expl.
Muurleeuwenbek935 expl.
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Tijdreeks Brouwersvaart mei‐september 2015
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23 sept. 2015
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http://www.floron.nl/onderzoek/muurplanten
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https://www.verspreidingsatlas.nl/login/
Meetnet Muurplanten Floron
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• https://www.verspreidingsatlas.nl/login/• Na account aanmaken en inloggen:
Meetnet Muurplanten Floron
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Gemiddelde jaartemperatuurNederland (KNMI)
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