Title Shape differentiation and characterization in the two morphotypes of the Antarctic limpet Nacella concinna using Elliptic Fourier analysis of shells
Author de Aranzamendi, M.C.; Martínez, J.J.; Sahade, R.
Author Affil de Aranzamendi, M.C., Universidad Nacional de Córdoba, Genética de Poblaciones y Evolución Facultade de Ciencias Exactas, Físicas y Naturales, Cordoba, Argentina
Source Polar Biology, 33(9), p.1163-1170. Publisher: Springer-Verlag, Berlin, Germany. ISSN: 0722-4060
Publication Date Sept. 2010
Notes In English. 34 refs. GeoRef Acc. No: 309109
Index Terms Antarctica--Anvers Island; Antarctica-- King George Island; Southern Ocean; Antarctica; Anvers Island; data processing; ecology; Fourier analysis; Gastropoda; genetics; Invertebrata; King George Island; Mollusca; multivariate analysis; physiology; Renaud Island; Scotia Sea Islands; shells; South Shetland Islands; statistical analysis
Abstract The Antarctic limpet Nacella concinna (Strebel 1908) presents two ecotypes (littoral and sublittoral) differing in morphological and behavioral characteristics and more recently discovered, in physiological traits and genetic population structure. Previous works, based on traditional morphometry, used only three measurements (length, width and height of the shell) and their relationships. However, this methodology could not describe in detail the shape of the morphotypes. In the present work, Elliptic Fourier analysis (EFA) of shells was used to study the shape of the two morphotypes in six localities along the Antarctic Peninsula. The use of EFA confirmed the morphometric differences. The littoral morphotype has higher and globose shells with the apex displaced to the anterior part; the sublittoral individuals are more flat and pointed, and have the apex very well defined. Low allometric effect was detected in SL individuals, whereas L specimens did not show an allometric relationship within the examined size range. Differences in shell shape among localities were recorded. EFA analysis reflected the overall shell shape and allowed to characterize the main differences in shell shape between ecotypes that were difficult to quantify using the standard morphometric approach.
URL http://hdl.handle.net/10.1007/s00300-010-0803-2
Publication Type journal article
Record ID 91201