The present study reveals preliminary lepidological results in a critically endangered species, Petzea rudd (Scardinius racovitzai Müller 1958) from Petea Spring Natural Reservation, Bihor county, Romania. Study of scales morphology in Petzea rudd was performed by use of light microscopy. This is the first attempt to reveal some scale features such as: scale type, shape, arrangement and number of radii and position of focus on scale on Petzea rudd. The geometric morphometric analysis has been applied in order to identify the characteristics for a reliable discrimination between Petzea rudd and its related species from Romanian inland waters, common rudd, Scardinius erythropthalmus (Linnaeus, 1758). The comparative analysis of scales shape in S. racovitzai and S. erythrophthalmus highlighted the statistically significant discrimination among two sets of observations and the significant variation of focus position and shape of scales among these two species.
The precarious temperature regime, associated with the negative influence of other environmental and biotic factors, represents a major risk for the survival of the thermal rudd from the lake Ochiul Mare, located in the Pârâul Peţea natural reserve. Therefore, a complex morphometric and body geometry analysis was conducted on specimens collected in 2013 in order to define the variability of the present population. The relatively small sample size is due to legislative restrictions on collecting endangered species, so statistical methods of analysis were applied to increase confidence in the assertions. RÉSUMÉ:Les résultats préliminaires concernant la caractérisation morphométrique actuelle du rotengle thermale, Scardinius racovitzai Müller, 1958 de la Réserve Naturelle Pârâul Peţea.Le régime précaire de température et en même temps l'influence négative des autres facteurs biotiques et de l'environnement est un risque majeur pour la survie et le potentiel reproductif du rotengle thermale, une espèce endémique de l'écosystème du lac thermal Ochiul Mare de la réserve naturelle Pârâul Peţea. C'est pourquoi l'analyse complexe de la morphométrie et la géométrie corporelle des spécimens capturés en 2013 a été effectuée pour caractériser la variabilité de la population courante. Les méthodes de traitement statistique ont été appliquées pour agrandir le degré de confiance des affirmations, en ce qui concerne les échantillons assez petits en raison des restrictions législatives pour la capture d'une espèce en péril. REZUMAT:Rezultate preliminare privind caracterizarea morfometrică actuală a roşioarei termale, Scardinius racovitzai Müller 1958 din Rezervaţia Naturală Pârâul Peţea.Regimul termic precar coroborat cu acţiunea negativă a altor factori de mediu şi biotici reprezintă un risc major pentru supravieţuirea şi potenţialul reproductiv al roşioarei termale Scardinius racovitzai, endemică în lacul termal Ochiul Mare din Rezervaţia Naturală Pârâul Peţea. De aceea, o analiză complexă din punct de vedere morfometric şi al geometriei corporale a specimenelor de roşioară termală, colectate în 2013 a fost realizată în vederea caracterizării variabilităţii populaţiei existente la momentul actual. Metode de prelucrare statistică au fost aplicate pentru a extinde gradul de confidenţă a afirmaţiilor, în condiţiile mărimii reduse a probelor impuse prin restricţiile legislative corespunzătoare gradului de periclitare a speciei.
The current study completed the information regarding the phenotypic variability in the Danube ruffe (Gymnocephalus baloni). We also assessed the phylogenetic relationship of G. baloni with the other two species of the genus Gymnocephalus from the Lower Danube River. Ten morphological characters were the most useful together for discriminating between G. baloni and G. cernua from the Lower Danube River. In addition, we found a more streamlined body shape in G. baloni compared with the described holotype, which could be in connection with fish phenotypic response to ecological characteristics of the Lower Danube River.
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