Distribution maps for odonate species from the faunistic Swedish provinces Västerbotten, Åsele Lappmark and Lycksele Lappmark are presented. The maps are based on 176 localities sampled between 1986-1992. Twenty-four species were found in the area, and I 0 of these are classified as common, while two are very rare

Johansson, Frank

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© Entomologica Fennica. 12.X.l993 The distribution of Odonata in Vasterbotten and South Lapland, northern Sweden Frank Johansson Johansson, F. 1993: The distribution of Odonata in Vasterbotten and South Lapland, northern Sweden.- Entomol. Fennica 4:165-168. Distribution maps for odonate species from the faunistic Swedish provinces Vasterbotten, Asele Lappmark and Lycksele Lappmark are presented. The maps are based on 176localities sampled between 1986-1992. Twenty-four species were found in the area, and I 0 of these are classified as common, while two are very rare. Frank Johansson, Department of Animal Ecology, University of Umea, S-90187, Umea, Sweden 1. Introduction Knowledge of the distribution of a species may help us to understand why a species is confined to its present range. When did the distribution of a species expand or contract and what were the reasons? What roles do abiotic and biotic factors play in setting the distribution limits? And so on. It follows that sound knowledge regarding the distribution of species is of prime importance. Further, since the impact of mankind upon the environment is increasing dramatically, it is im-portant to have the background data necessary for measuring such impact. Recent! y, several books including distribution maps dealing with the odonates of Europe have been published ( d' Aguilar et al. 1986, Sandhall 1987, Askew 1988). Unfortunately these maps do not give a valid picture of distributions within the boreal zone of northern Europe. This short-coming is an artefact due to the limited collecting of odonates in these areas. Most of the cited data are old and tell us little about recent distributions. Data from northern Sweden are also available from the middle years of this century, as presented by Ander (1931, 1944, 1946, 1950, 1951, 1953), and Valle (1952), as well as some more recently published data (Jensen & Mendl1974, Johansson 1988, 1991, 1992, Mendl 1981, Norling 1984, Sahh~n 1985, 1987). Most records cited by Ander & Valle are old (some dating back more than 100 years), while others represent provincial records only. The more recent publications listed are mostly restricted in area or give only provincial records. To improve the situation I here present my records from 7 years of sampling (1986-1992) within the faunistic provinces Vasterbotten, Asele Lappmark and Lycksele Lappmark (Fig. l). 2. Study area and methods The region studied covers a transect from the Bothnian coast in the east to the western moun-tains. Along this transect there is considerable change in climate, temperatures decreasing from east to west (Liljequist 1970). Altogether 176 localities have been sampled, i.e. either nymphs, adults or both have been collected. The number of localities sampled is highest in the coastal areas (Fig. 2). Consequently, many species may be more common in the western parts than shown 166 Johansson: Odonata in northern Sweden • ENTOMOL. FENNICA Vol. 4 Fig. 1. Map showing the investigated area and the three faunistic provinces considered for odonate distri-bution. un Lhe maps. The presence of a species is marked by a dot according to the Universal Transversal Mercator (UTM), (Fig. 2). I define the mountain zone as the area above the upper coniferous limit. This zone consists of birch forest and above this an alpine region. Below, I comment on the dis-tribution of the species recorded. Together with the distribution maps (Fig. 3) I also give the most common habitat(s) for each species. The tax-onomy and nomenclature are according to Sand hall ( 1987). 3. Species account Of the 24 species found, ten are common in the whole area outside the highest mountains: Calo-pteryx virgo, Enallagma cyathigerum, Coenag-rion hastulatum, C.johanssoni, Aeshna juncea, A. caerulea, Cordulia aenea, Somatochlora metal-lica, Leucorrhinia dubia, L. rubicunda. Of these ten species some are fairly common in the moun-tain area as well: A.juncea, A. caerulea, L. dubia and L. rubicunda, with A. caerulea being more Fig. 2. Map showing the international UTM grid sys-tem of the area considered for odonate distribution (squares measure about 50x50 km). Figures in squares are number of localities investigated and number of species recorded respectively in each square. Hatched squares were not investigated. abundant in the central and western area com-pared to the coastal region. The five species C. hastulatum, A. juncea, C. aenea, L. dubia and L. rubicunda are found abundantly at almost every locality sampled, and consequently they may be judged as very common outside the mountains. The following species are common in the coastal area but appreciably rarer further inland: Lestes sponsa, Coenagrion lunulatum, C. arma-tum, E1ythromma najas, Aeshna grandis, Cor-dulegaster boltoni, Cordulia aenea, Libellula quadrimaculata and Sympetrum danae. Of these C. armatum, A. grandis, C. aenea and L. quadri-maculata reach farthest to the west. L. sponsa and S. danae are probably more or less restricted to the coastal area. Here they can be locally very abundant. These two species have an obligate one year life cycle (Sandhall 1987, Askew 1988) and should benefit from the long late summer period in this area. Of the species judged as not being common, Aeshna subarctica is probably present in the whole area, though not common. This species is very similar to A. juncea (e.g. d'Aguilar eta!. 1986), and it is easily overlooked. Somatochlora alpestris and S. arctica are probably also present in the whole area, since they are species known to occur the farthest to the north and at the high-est elevations in the Swedish mountains (Ander 167 Ca\oplei)'X virgo (Unne) SS(RR) (MP) ~~-····-· "-~--·-~ "··---"-~·~ . ~·~ coenagrioo armatum (Charpenlier) MPML ~-··--·'·~- ·---·-~"" =--.. ~~'"' BPMPML MPML BP Erylhromma oaias (H.ansemann) MLMPBP Aeshna grandis (Linne) MLMPBP RR somatochtora alpeslris (Selys) BP --~·"' -·-·- -·=-'"~' .~~ . . ~·~---·-""' ~--·""' ___ _..,. .. ~,-· ~- .~~ .~~~M§ __ ..... -... ~···~~-~- ............. , .. , BP MLMPBP MP ·--·~""""""~' ··---·~-··""' , .. .-..... ---· .~~ .~~ . F<g. 3. Qt;t<ib"tton and oommon harntats of Odonata tn v,;stert>otton. Habttat abb<evtatfo"'' BP bOg ponds; MP mewtmphio ponds; OL oltgot<oph< lakeSi ML mesotmphio lakSSi RR Rive<Si SS sloW st<ean>Si FS tasl st<eams. SympelrUOl danae (Sulzer) MPBP 168 Johansson: Odonata in northern Sweden • ENTOMOL. FENNICA Vol. 4 1951). Pyrrhosoma nymphula is found in 5 lo-calities only, but is fairly abundant in these. Sympetrum vulgatum and Leucorrhinia albifrons are the only species considered to be rare. They are found at one locality each. However, as sev-eral individuals were observed, and the species have been found during two consecutive years, I do not regard these as occasional records. Acknowledgements. Thanks to Anders Nilsson and Christian Otto for valuable comments on the manuscript. Ulf Norling verified several identifications and Gorel Marklund drew the figures. Finally I would also like to thank all those who have supplied me with collections of odonates for this publication. References d' Aguilar, J., Dommanget, J-L. & Prechac, R. 1986: A guide to the dragonflies of Britain, Europe and North Africa, translated by Brooks, S., Brooks, N. & Robertson, T.S.- Collins, London. 336 pp. Ander, K. 1931: Bidrag till kannedom om de svenska Odonaterna 5, NorrHindska trollsHindor. - Entomol. Tidskrift 52:228-244. 1944: Catalogus Insectorum Sueciae, IV, Odonala.-Opuscula Entomol. 9:157-163. 1946: De svenska odonaternas djurgeografi. Bidrag till kannedom om de svenska odonaterna 6. - Opus-culaEntomol.l1:109-1l8. 1950: Zur verbreitung und Phanologie der Boreoalpinen Odonaten der Westpaliiarktis. - Opuscula Entomol. 15:53-71. 1951: Odonata.- In: Brinck, P. & Wignstrand, K. G. (eds.): The mountain fauna of the Virihuare area in Swedish Lappland. IT. Kung!. Fysiogr. Sallsk. Handl., N.F. Avd. 2 46(2):123- 126. Lund. 1953: Catalogus Insectorum Sueciae; Odonata addi-tamenta.- Opuscula Entomol. 18:87-88. Askew, R. R. 1988: The dragonflies of Europe. - Harley Books, Essex. 291 pp. Jensen, C. F. & Mend!, H. 1974: Trollslandor (Odonata) i Kaltisjokko omrildet.- Norrbottens Natur 30: I 7. Johansson, F. 1988: Forbiseddda trollsliindor (Odonata) i Norrland.- Natur i Norr 7:36-37. 1991: Trolls Iandor friin Holmoarna. - Natur i Norr 10:70-71. 1992: Nya landskapsfynd av trollsliindor (Odonata) i mellersta Norrland.- Entomol. Tidskrift 113:56-57. Liljequist, G. H. 1970: Klimatologi. - Generalstabens Litografiska anstalt, Stockholm. 527 pp. Mend], H. 1981 : Dragonflies (Ins Odonata) in the estuarity of the river Angeran. - Fauna Norrlandica I: 1-7. Norling, U. 1984: The life cycle and larval photoperiodic responses of Coenagrion hastulatum (Charpentier) in two climatically different areas (Zygoptera: Coenag-rionidae). - Odonatologica 13:429-449. Sahlen, G. 1985: Trollslandor i Medel pad. - Entomol. Tidskrift 106:155-156. - 1987: LandskapsfOrteckning over norra Sveriges trollslandor.- Natur i Norr 1:35-38 Sandhall, A. 1987: Trollsliinder i Europa. - Interpub-lishing, Stockholm. Valle, K. J. 1952: Die Verbreitungsverhaltnisse der ostfennoskandischen Odonaten. - Acta Entomol. Fennica I 0: 1-87. Received I O.Xl.l992 2 

The distribution of Odonata in Västerbotten and South Lapland, northern Sweden

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The distribution of Odonata in Västerbotten and South Lapland, northern Sweden

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