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Fauna norvegica 2009 Vol. 29: 11-54. ISSN: 1502-4873 Freshwater rotifers from Hordaland, western Norway, with a survey of freshwater rotifers previously found in Norway Brit Godske Bjørklund Bjørklund BG. 2009. �reshwate�������r��� r�����otife��r� �rom� Ho ����rd�l�nd�� weste �������rn No��rway,��� with ������ � �ur��vey��� �of� �reshwate�������r rotifer� previou�l� found �n Norway. Faun� Norveg�c� 29: 11-54. A total of 156 �p�cies (�r �ub�p�cies) of rotifers, mostl� n�n-pl�nkton�c have been �d�ntified �rom �reshwater �r �l�ghtl� br�ckish-water l�c�lities �n the c�unty of Hord�l�nd; 83 �r� new to Norway �nd 24 other� �r� new to the c�unty. On� �undr�d of the �p�cies wer� c�ll�cted �rom the two ��lleys of Eksing�d�l�n �nd Teigd�l�n �n �pr�ng �nd �ummer 1967. Samples wer� tak�n �n the shallow shores of l�k�-l�k� p�rts of the rivers, �nd �n pools, tarn� �nd small l�kes. Forty mor� �r less �uryhal�n� �resh- water rotifer� wer� �lso c�ll�cted dur�ng studies of �l�ghtl� br�ckish-water l�c�lities �r�und B�rg�n �n 1963-1969. A nub�r of �reshwater rotifer� wer� c�ll�cted at sever�l l�c�lities �n �nd �r�und B�rg�n �n 1968-1970 �nd �n the western p�r� of Hard�ng�rvidd�. O� those so far �d�ntified 23 �r� new to Norway �nd 8 mor� �r� new to the c�unty. They �r� therefor� �nclud�d �n the �p�cies list. A few �ddition�l �nes �r� referr�d to �n the tax�nomic�l notes. All the �p�cies �r� listed with l�c�lities �nd habitat categ�ries, �r �n the case of the last-mention�d �nes, just the distr�c� wher� they wer� c�ll�cted. The p�p�r �ncludes notes, measurements �nd �n most cases, figures r�g�rd�ng 44 littl� known ��riabl� �r tax�nomic�ll� pr�blematic�l �p�cies, esp�ciall� �n the g�n�r� Cephalodella �nd Trichocerca. Comments �r� given �n the distr�bution �bund�nc� �nd diversity of the �p�cies. The p�p�r presents � �urvey of previou� �nvestigation� �n rotifer� �n Norway, listing 200 previou�l� r�c�rd�d �reshwater (� few �uryhal�n�) rotifers, giving other names, the �uthor� who r�c�rd�d the find� �nd �n most cases, the c�unties wher� the �p�cies wer� c�ll�cted. Key words: Rotifera, Norway, �resh water distr�bution tax�nomy Brit Godske Bjørklund, Birkelundsbakken 56, NO-5231 Paradis, Norway Corresponding author: Brit Godske Bjørklund E-mail: [email protected] Phone: +4755911713. Mobile: +4799449459 Some �nvestigation� wer� �lso mad� b� for��gn rotifer �p�c��l- INTRODUCTION ists �n brief visits to Norway. Olofsson (1917) found 17 �p�cies �n the isl�nd of V�rdø� �n Finnmark �dd�ng three new �nes to A nub�r of detail�d �nvestigation� of, mostl� �reshwater rotif- the list. V�rg� (1936a, 1936b 1938) mad� detail�d studies �n �r� wer� p�rformed �n mainl�nd Norway �n the first hal� of the some l�kes �n Finnmark. He �d�ntified 121 �p�cies, �dd�ng 44 twentieth c�n�ur�. Both pl�nkton�c �nd n�n-pl�nkton�c �p�cies new �nes. B�rz�n� (1952) found four �reshwater �p�cies, two of wer� deal� with. The first was Lie-Pettersen (1905) who found them new to Norway, near the river mouth �n Aurl�ndsfj�rd 12 mor� �r less �uryhal�n� �reshwater �p�cies �n br�ckish water S�gn & �j�rd�n�. Thomasson (1956) �d�ntified 10 �p�cies, �r�und B�rg�n. �uitfel�-Kaas (1906) c�ll�cted pl�nkton �rom �nclud�ng �n� new �ne, �n two l�kes �n Dovrefj�ll � mountain sever�l l�kes �n six c�unties �n southern Norway; 19 of the �p�- massif �n Sør-Trønd�l�g. cies wer� new to Norway. Lie-Pettersen (1909 1910) mad� mor� detail�d �nvestigation� of �reshwater rotifer� �n Norway, �nd Sever�l g�n�r�l limn�l�g�c�l �nvestigation� of pl�nkton have �dd�d 108 to the list, whic� then nub�r�d 139 �p�cies. mostl� �nl� �d�ntified common �p�cies. S�rø (1921 1926 1927 1930 1931 1932 1944) r�c�rd�d 15 rotifer �p�cies �n 11 Bjørklund: Freshwater rotifers in Norway differ�n� p�rts of the c�un�ry, bu� �nl� �dd�d �n� to the list the same mesh siz� was used to sampl� pl�nkton �n mountain of new �p�cies. Haug� (1957) �d�ntified 10 �p�cies �rom l�kes l�kes, � few tarn� �nd � few sites �n the river�. The p� was �r�und Voss, Hord�l�nd �dd�ng �n� new �n�. Elgmork (1964) r�ug�l� determin�d with � l�qu�d universal �nd�cator. The water c�ll�cted pl�nkton �n p�nd� �n Bu�k�rud �nd �dd�d four new temp�r��ur� was �lso measur�d. �nes. L�rsson (1968 1978) studied pl�nkton�c rotifer� �n � l�k� �n Ak�rshus, near O�lo, �nd �nother �n Oppl�nd �nd �dd�d The sampl�ng �n Eksing�d�l�n took pl�c� between the sec- �n� new �p�cies. Løvik (1980 1984) c�ll�cted some rotifer� �nd week of Jun� �nd the sec�nd week of August, �nclusive. among zoopl�nkton �rom two l�kes �n Oppl�nd. K�ksvik (1985) T��gd�l�n was briefl� visited �� the b�g�nn�ng of Apr�l �nd c�ll�cted some rotifer� �n � l�k� �n Hedmark. R��n�rtsen et �l. mor� comprehensive sampl�ng was d�n� dur�ng the sec�nd (1997) c�ll�cted rotifer� dur�ng pl�nkton �nvestigation� �n � hal� of August. The mater��l was �xamin�d �resh, to �bserve l�k� �n Nord-Trønd�l�g �dd�ng �n� new �p�cies. Wær�åg�n the rotifer� �live �nd mor� easil� distinguishabl� �rom the sed�- & Nilssen (2003) studied pl�nkton�c rotifer� �n l�kes �n Aust- ments. Samples of water �nd sedimen� wer� c�ll�cted �n � Petr� Agd�r �nd T�lemark �dd�ng two new �p�cies. Halvorsen et �l. dish for �xamination und�r � stereomicrosc�p�. M�n� of the (2004) c�ll�cted rotifer� �n A�n�jø�n � l�k� str�ddl�ng the c�un- rotifers, esp�c��ll� the unknown �r unc�rtain �nes, wer� �urther ties of Oppl�nd �nd Hedmark �nd �dd�d �n� new �p�cies. �xamin�d und�r �n �rd�n�r� microsc�p� �� magnification� of 500 to 1500 x. The l�r�cate forms wer� k�ll�d �n formal�n befor� Hence, with � fairl� hig� d�gree of c�rtainty, � total of 200 �p�- b��ng studied �n detail. The �ll�r�cate �p�cies wer� studied �live, cies (�r �ub�p�cies) of rotifer� have been c�ll�cted �n Norway �r after �dd�ng small amounts of gl�c��l �cetic �c�d to the sid� prior to the new �nes published �n the presen� p�p�r. The of the cover glass. This mostl� n�rcotised �r k�ll�d the �nimal syn�nym lists of Harr�ng (1913) �nd Wiszniewsk� (1954) have �n �n �xtend�d position. The �r�phi wer� studied �� the highest been of great help for the �ldest r�c�rd�. S�g�r� (2007) has been magnification after dissolving the other tissues. R�presentatives c�n�ulted for val�d names �nd syn�nyms. of most �p�cies wer� drawn �nd/�r measur�d b� mean� of � drawing �ub� to �n�bl� pr�cise �d�ntification whic� �n man� The presen� �uthor studied rotifer� �n mar�ne, br�ckish-water cases was d�n� later. Some �p�cimen� wer� �d�ntified �nl� to �nd �reshwater habitats �n Hord�l�nd �n 1963-1970. Onl� some the g�nu� level other� not �� �ll. The r�lative �bund�nc� of eac� of the mar�n� �nd br�ckish-water mater��l has been published �p�cies was r�ug�l� estimated to �n� of three level�. (Er�ksen 1968 Bjørklund 1972a, 1972b). A tabulated �cc�un� of the distr�bution of �p�cies �rom �reshwater habitats �n Norway The sal�nity �n the br�ckish-water l�c�lities near B�rg�n was has been published (Bjørklund 1996). measur�d with �n aerometer. All the sampl�ng her� �nd �n the �reshwater l�c�lities visited later was d�n� with the small r�d The presen� p�p�r �ncludes �ll the �d�ntified �reshwater �p�cies net. The p� �nd temp�r��ur� wer� n�rmall� measur�d. The c�ll�cted �n Hord�l�nd �n 1963-1970. Most of the �nvestig�- samples c�ll�cted �n Hard�ng�rvidd� wer� fix�d �n formal�n tion took pl�c� �n two valleys, Eksing�d�l�n �nd T��gd�l�n. In for later �xamination. The other� wer� �xamin�d �resh �n the �ddition �p�cies �rom some �l�ghtl� br�ckish-water l�c�lities way descr�b�d �bove. R�presentatives of lesser known �r var�- �r�und B�rg�n �r� �nclud�d as �r� other� new to Hord�l�nd �bl� �p�cies, wer� drawn �nd/�r measur�d.