AN APPROACH TO QUANTIFY THE SHELL SHAPE OF ABRA ALBA (BIVALVIA: SEMELIDAE)

CAN YILMAZ E.

FRESENIUS ENVIRONMENTAL BULLETIN, cilt.26, sa.12, ss.7534-7538, 2017 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 26 Sayı: 12
  • Basım Tarihi: 2017
  • Dergi Adı: FRESENIUS ENVIRONMENTAL BULLETIN
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.7534-7538
  • Anahtar Kelimeler: Morphometry, shell size, shape, ROC analysis, AUC, Abra alba, VENERUPIS-PHILIPPINARUM, MORPHOLOGY, DYNAMICS, PATTERNS, MODELS, COAST, BAY
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

This study presents a possible variation between size groups of Abra alba population and the shape descriptor(s) to quantify the shell shape of the population. Size measurements (the length, height, area and the perimeter of the shells) and shape descriptors (circularity, elongation, compactness and convexity of the shells) were calculated using ImageJ. The descriptive ability of shape parameters was assessed by using Receiver Operating Characteristic (ROC) curves analysis. To be able to determine the describing power of the descriptors, evaluation was carried out in two steps. At the first step, the descriptors were analyzed singly, which showed a low accuracy with a smaller AUC (area under curve), respectively. To increase the AUC, different combinations of shape descriptors were generated for the second step of the evaluation. The best descriptive combination was A (circularity+ elongation+ compactness+ convexity).