Morphological variation of European grayling (Thymallus thymallus) from three different basins (Adriatic Sea, Black Sea and Caspian Sea) based on external body morphology.
2016
Autori:
Bajić, AleksandarJojić, Vida
Miljanović, Branko
Snoj, Aleš
Askeyev, Oleg
Askeyev, Igor
Marić, Saša
Tip dokumenta:
Konferencijski prilog (Objavljena verzija)
,
© 2016 by the Macedonian Ecological Society
Metapodaci
Prikaz svih podataka o dokumentuApstrakt:
The European grayling, Thymallus thymallus (Linnaeus, 1758) is salmonid fish species
naturally inhabiting most of European continent. In the past two decades majority of research aimed
European grayling genetic structure and description of its phylogenetic lineages. In contrast, not
many morphological studies of this species have been published so far. We analyzed external body
morphology of T. thymallus from three different basins that correspond to three previously described
phylogenetic lineages. Landmark-based geometric morphometric methods were applied to specimens
of five European grayling populations (Adriatic Sea – Soča River, Black Sea – Sava Bohinjka and Una
Rivers, Caspian Sea – Bugurla and Kana Rivers). Body size analyses disclosed statistically significant
differences for all pairwise comparisons, except for those between Sava Bohinjka and Una (P=0.0505)
and between Bugurla and Kana populations (P=0.1016). When comparing centroid size (CS), Soča
population had the largest mean value (CS=40.11), while Bugurla population had the smallest one
(CS=18.67). Using multivariate regression of shape variables onto log CS we found that allometric
effect was significant (P<0.0001) and accounted for 6.37% of overall shape variation. Canonical variate
analysis (CVA) of non-allometric shape variation showed clear separation of all populations. Specimens
from Bugurla and Kana populations in comparison to those from the other three populations (separated
along CV1) are characterized by heads with smaller opercle in relation to subopercle and trunks with
longer dorsal and adipose fins and larger distance between anterior bases of ventral and anal fins.
Individuals from Soča population compared to those from Una population (separated along CV2) have
more robust heads and trunks with longer dorsal fins. These results match to genetic differences already
observed for populations studied herein. Morphologically most diverged population was the one from
Soča River (Adriatic basin) which is in accordance with its large genetic distinctiveness.
Ključne reči:
Salmonidae; Geometric morphometrics; Allometry; shape; sizeFinansiranje / projekti:
- Genetička i fenetička raznovrsnost u prirodnim populacijama u različitim sredinama - doprinos polimorfizma B hromozoma (RS-MESTD-Basic Research (BR or ON)-173003)
U:
- 5th Congress of ecologists of the Republic of Macedonia with international participation: Abstract book; 2016 Oct 19-22; Ohrid, Republic of Macedonia. Skopje: Macedonian Ecological Society; 2016. p. 35.