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Teleostei: Cyprinidae), in the Upper Vistula Drainage (Southeast Poland)

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Teleostei: Cyprinidae), in the Upper Vistula Drainage (Southeast Poland) Arch. Pol. Fish. (2011) 19: 37-49 DOI 10.2478/v10086-011-0005-8 RESEARCH ARTICLE Contributions to the morphological variation of the common gudgeon, Gobio gobio complex (Teleostei: Cyprinidae), in the upper Vistula drainage (southeast Poland) Micha³ Nowak, Jan Mendel, Pawe³ Szczerbik, Artur Klaczak, Tomasz Miko³ajczyk, Konrad Ozga, Barbara Fa³owska, W³odzimierz Popek Received – 09 November 2010/Accepted – 10 February 2011. Published online: 30 March 2011; ©Inland Fisheries Institute in Olsztyn, Poland Abstract. Recent molecular research indicates that several Introduction distinct species have been confused under the name Gobio gobio (L.); thus, comparative investigations of numerous local populations are urgently needed. The present study presents Gobioninae are a subfamily of the family Cyprinidae and discusses detailed morphometric characteristics of 82 comprising small, bottom-dwelling fishes of practi- individuals from the G. gobio complex of nine tributaries of cally no commercial importance (Kottelat and the upper Vistula River (southeast Poland) within the context Freyhof 2007, Mendel et al. 2008a, 2008b, Nowak et of the known variability of this species. The specimens al. 2008a). This is why they have long been disre- analyzed generally resemble G. gobio s. stricto in a number of garded as a subject of ichthyological investigations in morphometric and meristic characters. The results are rather consistent with previous literature data on Polish populations Poland, as well as in Europe in general. Nevertheless, of the “common gudgeon”; however, as long as molecular they have been investigated extensively by taxono- analyses are not available, precise identification is impossible. mists. It was Bãnãrescu (1961) who divided the ge- nus Gobio into the three subgenera, namely Gobio Keywords: biometrics, Gobioninae, ichthyofauna, sensu stricto, Romanogobio, and Rheogobio. Naseka traditional morphometrics, Vistula drainage (1996) later elevated them to the rank of distinct gen- era. Naseka and Freyhof (2004) joined the genera Romanogobio and Rheogobio as they judged the lat- ter to be a junior synonym of the former. Presently, the genera Gobio and Romanogobio are well estab- M. Nowak [+], P. Szczerbik, A. Klaczak, T. Miko³ajczyk, K. Ozga, B. Fa³owska, W. Popek lished among fish taxonomists; however, some au- Department of Ichthyobiology and Fisheries thors still consider Rheogobio to be a valid genus University of Agriculture in Kraków (e.g., Nalbant 2003, also Nalbant, pers. comm.). Spiczakowa 6, 30-199 Kraków-Mydlniki, Poland Tel./Fax: +48 12 637 51 76, +48 12 638 59 79; Due to conceptual changes in modern systemat- e-mail: [email protected] ics regarding mainly the shift from biological to J. Mendel phylogenetic and evolutionary species concepts and Department of Fish Ecology the abandonment of the subspecific category Institute of Vertebrate Biology (Kottelat 1997, Wiley and Mayden 2000, Kottelat Academy of Sciences of the Czech Republic v.v.i. and Freyhof 2007), many former subspecies or local Kvìtná 8, 603 65, Brno, Czech Republic forms have been recognized as valid species. Thus, 38 Micha³ Nowak et al. some former “catch-all” species considered to be results obtained in reference to data from adjacent highly polymorphic and to consist of a number of countries, mainly those from the works of Berg subspecies, were divided into distinct species (1949) and Bãnãrescu (1954, 1961). Following the (Naseka et al. 2006, Mendel et al. 2008a, Nowak et latter, Rolik (1965a) tried to explain the observed al. 2008a). The type species for the genus Gobio, the variability in certain morphometric traits placing Pol- common gudgeon, Gobio gobio (L.), was redescribed ish populations “somewhere between” G. gobio gobio by Kottelat and Persat (2005). and G. gobio obtusirostris, and applying the terms of In Poland, the taxonomy of this group of fishes “lotic” and “lentic” ecological forms. Very recently it has never been thoroughly clarified (Nowak et al. was hypothesized that what is thought in the Vistula 2008b). Since the series of works by Rolik (1959, River drainage to be G. gobio could indeed consist of 1965a, 1965b, 1965c, 1967), it has been widely ac- a group of very similar species (Nowak et al. 2008b). cepted that the territory of Poland is inhabited by Molecular data showed that this idea was generally three gudgeon species. In addition to G. gobio, true, and at least two evolutionary lineages of the Kessler’s (sand) gudgeon, Gobio kessleri Dybowski, “common gudgeon” were identified on Polish terri- currently Romanogobio kesslerii (Rolik 1959), and tory (Nowak et al. 2009a, Mendel and Nowak, the whitefin gudgeon, Gobio albipinnatus Lukasch, unpubl. data). The first is Lineage_I that refers to G. currently Romanogobio albipinnatus (Rolik 1965b), gobio sensu stricto and the second is Lineage_V are recorded. In the past, another species, the stone (Gobio sp. 2, a probable undescribed species) ac- (longbarbel) gudgeon, Gobio uranoscopus Agassiz, cording to Mendel et al. (2008a, 2008b). currently Romanogobio uranoscopus, was also re- In their rediscription of G. gobio, Kottelat and ported from the upper Vistula drainage (e.g., Staff Persat (2005) emphasized the fact that, although 1950); however, Rolik (1959, 1965c) clearly showed there have been a number of reviews concerning the that this was the result of confusion with R. kesslerii. taxonomy of the genus Gobio (e.g., Bãnãrescu 1954, Recent studies show, however, that all these names 1961, 1962, 1992, Bãnãrescu et al. 1999), they have have been applied for species groups comprising of been based mainly on a restricted number of popula- a number of distinct species (Mendel et al. 2006, tions and the results have been generalized over 2008a, 2008b, Kottelat and Freyhof 2007, Nowak et a wide range. Thus, Kottelat and Persat (2005) pos- al. 2009a). tulated the need for intensified efforts to compare nu- Beside the “nominative form” of the common merous populations from adjacent drainage using gudgeon, G. gobio gobio, the occurrence of two other similar methodology. Naseka et al. (2006) did this to subspecies was presumed. In the Czarna Orawa review some populations from Turkey, and desig- River system within the Danube River drainage, nated certain new species. Surprisingly, in recent Balon and Holèík (1964) identified Gobio gobio years, beside some significant exceptions (e.g., obtusirostris (Valenciannes), whereas in the Strwi¹¿ Vasil’eva et al. 2004, 2005, Freyhof and Naseka River system within the Dniestr River drainage Rolik 2005), only scant attention has been paid to the issue (1967) found Gobio gobio sarmaticus (Berg). The lat- of morphological diversity and the identification of ter two taxa are currently considered valid species gudgeons of the genus Gobio. A number of questions (Kottelat and Freyhof 2007, Mendel et al. 2008a, b); regarding the taxonomy and identification of some however, they are considered in a slightly different local populations have not been answered defini- manner than in the 1960s, so this does not necessar- tively. ily infer their occurrence on Polish territory. A de- In the current study, molecular analysis was un- tailed re-examination of the material from the both available for a vast majority of specimens examined; river drainage is needed. thus, the paper deals solely with the G. gobio com- Rolik (1965a) examined the G. gobio material plex consisting of individuals representing at least from a number of rivers in Poland and discussed the two lineages according to Mendel et al. (2008a, Contributions to the morphological variation of the common gudgeon, Gobio gobio complex... 39 2008b), Lineage_I and Lineage_V, but disregarding at the Department of Ichthyobiology and Fisheries, their genetic identity (Mendel and Nowak, unpubl. University of Agriculture in Kraków under catalog data). The main goal of the present study was to con- numbers KIR 209 (Hoczewka, 3 specimens), KIR tribute to knowledge of the morphological variation 210 (Krzyworzeka, 12 spec.), KIR 211 (Mleczka, 8 of the G. gobio complex in the drainage area of the spec.), KIR 212 (upper San, 11 spec.), KIR 213 upper Vistula River system. (Sanoczek, 5 spec.), KIR 214 (Solinka, 8 spec.), KIR 215 (Tarnawka, 7 spec.), KIR 216 (Wiar, 5 spec.), and KIR 217 (Wis³oka, 23 spec.). Material and methods Methods for measurements and counts Study area and sampling methods In the laboratory, the gudgeons were measured for Fish were collected from 2006 to 2009 during 35 distances usually considered in taxonomic stud- ichthyological surveys in the upper Vistula River ies of this group of fishes (e.g., Bãnãrescu 1954, drainage. The study was performed on material col- 1961, Naseka and Freyhof 2004, Naseka et al. 2006, lected from nine rivers within the upper Vistula Nowak et al. 2008, 2009b, 2010, Nowak 2010) (Fig. drainage: Hoczewka, Krzyworzeka, Mleczka, upper 2). The measurements were performed generally ac- San, Sanoczek, Solinka, Tarnawka, Wiar, and cording to Hubbs and Lagler (1947), with some ad- Wis³oka (Fig. 1). A total of 82 specimens were used aptation from Naseka et al. (2006) and Nowak et al. in the study. The material was collected occasionally (2008b, 2009b). Standard length (SL), body length during monitoring surveys in the upper Vistula sys- (L) and head length (HL) were measured from the tip tem. The fish were caught by electrofishing using of the snout (upper jaw) to the end of the hypural a battery-powered portable electroshocker (IG-600T, complex, the end of the last perforated scale in the Hans Grassl GmbH). The fish were anaesthetised lateral line, and the most backward extending point with a lethal dose of 2-phenoxyethanol and fixed in of the opercular membrane, respectively. Caudal a 4% formaldehyde solution. The material was stored peduncle length (pl) was taken as a straight line from Figure 1. Study area with sampling sites marked in rivers: 1 – Hoczewka; 2 – Krzyworzeka; 3 – Mleczka; 4 – upper San; 5 – Sanoczek; 6 – Solinka; 7 – Tarnawka; 8 – Wiar; 9 – Wis³oka. 40 Micha³ Nowak et al. Figure 2.
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