Μελέτη της οικολογίας ειδών της οικογένειας Gobiidae στα εσωτερικά ύδατα της Δυτικής Ελλάδας με έμφαση στο είδος Economidichthys Pygmaeus (Holly, 1929) της λίμνης Παμβώτιδας (Doctoral thesis)
Until now, there are a limited number of studies about life-history strategies and the phylogenetic studies of endemic gobies in Greece. Based on the above considerations, the present doctorate thesis investigates the ecology of the endemic Economidichthys pygmaeus and the phylogenetic relationships of ‘sand gobies’ through morphometric variability and the use of molecular marker COI. A total of 1.698 specimens of E. pygmaeus were captured of which 356 were males, 480 were females and 862 were immature individuals. Μales reached higher length than females while juveniles made their appearance during spring. The growth of the goby was positively allometric for both sexes (b>3). The total sex ratio differed significantly from the theoretical value 1:1. The spawning period of E. pygmaeus in lake Pamvotis began in March to May. E. pygmaeus is an omnivorous fish which preys on copepods and chironomidae larvae. Cladocerans, gastropods and insects had less participation on diet. Under the frame of reproductive behavior, the lack of sound production was recorded between the male-male interactions of E. pygmaeus and during the courtship and spawning phases. The sound production from the rest of the ‘sand gobies’ implied that sound is an ancestral trait which E. pygmaeus lost secondarily. The morphometric analysis was performed on meristic characters and on 33 morphometric variables. Principal Component Analysis (PCA) demonstrated a difference in length of first dorsal and anal fin and the size of the head among species whereas Discriminant Analysis (DA) supported a clear discrimination of ‘sand gobies’. Cluster analysis showed a characteristic geographic pattern. The results showed that these phylogenetic methods agree with the systematic classification of genus Economidichthys through the clustering of E. pygmaeus and E. trichonis. The split-up of K. caucasica populations from the Ionian Sea including K. milleri with the K. caucasica populations from the Aegean Sea demonstrate the paraphyletic problem. Finally, the genus Pomatoschistus is divided into three monophyletic clades corresponding to the species P. minutus, P. marmoratus and P canestrinii.
|Institution and School/Department of submitter:||Πανεπιστήμιο Ιωαννίνων Σχολή Επιστημών και Τεχνολογιών Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών|
|Keywords:||Εσωτερικά ύδατα,Γωβιοί,Ηλικία-αύξηση,Αναπαραγωγή,Ηθολογία,Μορφομετρία,Μιτοχονδριακό DNA|
|Appears in Collections:||Διδακτορικές Διατριβές|
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