Náttúrufræðingurinn - 2010, Page 109

109
Tímarit Hins íslenska náttúrufræðifélags
Þakkir
Gunnar Stefánsson prófessor aðstoðaði við útreikninga og útfærslu á þumal-
fingursreglu Briggs (3. mynd). Kristín Svavarsdóttir, Árni Einarsson, Helgi
Björnsson og Ingibjörg Svala Jónsdóttir lásu greinina yfir og komu með
góðar ábendingar og leiðréttingar. Þeim eru öllum færðar þakkir fyrir.
Heim ild ir
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acaulis61) og bláberjalyngi (Vaccin-
ium uliginosum62). Þetta gildir raun-
ar ekki bara um Ísland því þessar
erfðafræðilegu rannsóknir benda
til þess að háplöntuflóran við norð-
anvert Atlantshaf hafi borist þang-
að eftir ísöld.1
Í þessari grein hafa verið tal-
in upp ýmis rök sem benda til
skammrar sögu núverandi flóru á
Íslandi en ekkert fjallað um þau sem
benda til hins gagnstæða, þ.e. að
hér hafi hluti lífríkis hjarað a.m.k.
síðasta jökulskeið. Bjarni K. Krist-
jánsson og Jörundur Svavarsson
telja að hellamarflærnar sem áður
var minnst á kunni að hafa lifað ís-
öldina af neðanjarðar.63 Þá hefur
verið bent á að plöntur virðast hafa
numið land hratt eftir að ísa leysti og
sæmilega fjölskrúðugur gróður birt-
ist tiltölulega fljótt.64,65 Gróður náði
að breiðast út á skammvinnu hlý-
skeiði, kenndu við Alleröd/Bölling,
áður en jöklar stækkuðu á ný í loka-
fjörkipp síðasta jökulskeiðs (yngra
Dryas-skeiði, 10,3 Ka BP).66 Það er
ekki víst að úr því fáist nokkurn
tímann skorið með óyggjandi hætti
hvort einhverjar háplöntur tórðu
hér af ísöld eða síðasta hluta hennar.
Hitt virðist að minnsta kosti ljóst að
núverandi flóra ber sjálf ekki merki
langrar sögu í landinu.
79 1-4#loka.indd 109 4/14/10 8:51:39 PM