JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org..Wiley-Blackwell and Nordic Society Oikos are collaborating with JSTOR to digitize, preserve and extend access to Oikos. Mills, C. A. and Eloranta, A. 1985. Reproductive strategies in the stone loach Noemacheilus barbatulus. -Oikos 44: 341-349.Egg volumes and larval weights of loach, Noemacheilus barbatulus (L.), from Konnevesi, an oligotrophic lake in central Finland were 2.4 to 3.1 times greater than those from the Frome, a calcareous stream in southern England and between 2.4 and 4.0 times those of other European populations. In Konnevesi most spawning occurred over 10-12 d shortly after ice melt when somatic condition was lowest. Other populations spawn successive groups of eggs over several months and somatic condition remains stable. At the commencement of spawning Konnevesi loach had heavier gonads than Frome fish but fecundity was only one tenth as high. Konnevesi loach in age groups III to V accounted for 94% of population fecundity whereas Frome fish in age groups I and II accounted for 95%. The proportion of new tissue allocated to reproduction in Konnevesi loach was close to zero until age III but subsequently rose from 0.36 to 0.52 of the total in VI group fish. In the Frome it rose from 0.35 in I group to 0.66 in III group fish. These contrasting reproductive strategies are discussed in relation to life-history theory and the environments in which these populations live. C. A. Mills, Freshwater Biological Association, River Lab., East Stoke, Wareham, Dorset BH20 6BB, UK. A. Eloranta, Water District Office of Central Finland, PL 110, SF-40101 Jyvdskyli, Finland. 06ea5 R I Bec mILmHOi< rwIn a Noemacheilus barbatuZus H3 KOHHeBe3H, QYroTpOc*HOrO 03epa B ijeHTpaJMHOtR 0HHnI5IHX~M B 2,4-3,1 pa3 601heM, Do~4 13 hpc*e, peKH B KBHoRl AHri H B 2,4-4,0 pa3a 6obue upyrx eBponef~cKHx rionyILtM. B KOHHeBe3H maicaCHM HepecTa HahbyOqBaniC B Te'eHH~e 10-12 gHeR BcKope rnocJne TaSIHHR Jmha, ripH caM-D& HH3KHX ccmaTHiEecKiix rioxa3aTencX. )gpyrme riorrynmw aEMteMnalO rIOCJIseOBaTeMHbie naprnM iHnqi B TeieHne HeCKQJ~hKHX mecMgeB, H Ccxa7Ia1eCKOe COCMonHEIe HX OCTaeTCH CTa6HJmHWb. B Ha'4aJ1e HKpomeTaH rIOeL H3 K0HHeBe3H PeeI boiIee TmDKeLe rOHajrW, 'iem pba 13 OpcMe, HO IUIQ9OBHTOCTb mX 6iaa Bbf nHlb Ha 0,1. Y rwffima H3 KOHHeBe3H I1l-Y BO3paCTHb1e Ipyrrbi cocTaBHOT 94% cyNmapHo4 rLflQ9oBHTocTH norIyjtH, a y p6 H3 OpOW I-rl B03pacT-Huie rpyriru giT 95%. OTHauIeH~ie BHOB JY1OKaJTH3oBaHHEDX TKaHek K pa3MHcweHo y romlia H3 KOHHeBe3H4 6TJ3KO K HYJ3O ,a0 1a B03paCTa, HO rIocTeneHHO yBewiHBaeTCH OT 0, 36 gto 0, 52 OT off BeSwH-LI B 1Y rpyne pub. Bo Qpwe OHO BO3paCTaeT OT 0,35 B I rpyrme 5go 0,66 B [ rpymrie pi6. 3m KoHTpacTmpymaIge penpoyKThBEHb*e cTpaTeri of5cyraioTcs B CB343H C TeopHeR )EH3He...

Abstract:Freshwater red algae (Rhodophyta) were studied in Central Finland by examining 2224 rivers and brooks during the open water periods of the years 2012-2015 with supplementary sampling in S-and SWFinland, the W-coast rivers and Lapland. A total of 1957 records of algae were made. Approximately 56.2% of the studied locations had 1-6 taxa. The total taxa collected were 25, with 5 taxa new to Finland. While sampling, ecological variables were recorded and measured. The most common taxa were Batrachospermum gelatinosum (37.0%), Sheathia arcuata (10.7%), Audouinella hermannii (11.2%) and Sirodotia suecica (7.0%). Lemanea spp. (9.9%) occurred in larger rivers. Most records were from July and August, but some also in winter months. From the most rare taxa, Lemanea condensata was found in Lapland rivers, Batrachospermum vogesiacum in acid, dystrophic rivers in Central Finland, B. atrum in 7 eutrophic rivers, Kumanoa globospora in 6 rivers of Central Finland, Batrachospermum elegans in 6 and K. virgatodecaisneana in 5 harder-water rivers of SW-Finland.

No abstract

No abstract

No abstract