Comparison of manual measurements and computer-assisted image analysis in fish morphometry

Abstract

Several authors have provided biostratigraphic age constraints for those Miocene marine deposits. Bassant et al. (2005) identified the NN4 calcareous nannofossil biozone (late Burdigalian-early Langhian; Martini & Müller 1986) in the lower part of the marine succession on the eastern side of the Mut Basin. According to the same authors, the upper part of the same marine succession should be part of the NN5 biozone (Langhian). In the Mut-Ermenek Basin, Tanar and Gökçen (1990) identified marine deposits as young as Serravallian. Similar ages for the Miocene marine succession cropping out north of Ermenek were provided by Janson et al. (2010). These authors identified 3 chronostratigraphic units within the mainly carbonate marine sediments of the Ermenek area. The first chronostratigraphic unit, which includes the lowermost part of the marine succession, is poorly dated as the upper part of the NN4 calcareous nannofossil biozone (latest Burdigalian-early Langhian). The second chronostratigraphic unit, which includes

Anthropogenic impacts on the contextual morphological diversification and adaptation of Nile tilapia (Oreochromis niloticus, L. 1758) in East Africa

“…This involves physical linear measurements of the fish anatomical parts like head length, body depth, total length, standard length, eye diameter, fin lengths, mouth gape length, among others. TM approaches are time consuming, biased/subjective and have been criticized as uninformative (Maderbacher et al 2008;Wilson et al 2008;Ponton et al 2013;Petrtyl et al 2014). Besides, most studies focused on West African water bodies and Egypt, with little attention to EA.…”

“…The arrangement of morphological Lms as data source and shape variation is extracted by Procrustes superimposition (Klingenberg 2011). When Maderbacher et al (2008); Park et al (2013); Ponton et al (2013);Petrtyl et al (2014), studied shape variations in fish comparing TM and Geometric morphometrics (GM), TM methodologies were realized weak contrary to GM. In addition, Rohlf (2002) employed GM while studying shape variation in Bluefin tuna, and was successful.…”

Prepared for the future: A strong signal of evolution toward the adult benthic niche during the pelagic stage in Labrid fishes

“…standard length (SL), body depth, and body width (Petrtýl et al. ). Additionally, we recorded 26 measurements, some of which reflect functionally important traits in prey capture and handling, while others are related to swimming performance (Collar et al.…”

Effect of bodyside-specific data processing on the results of fish morphometric studies

“…Thus, knowing the relevance of this feature could be crucial if databases or results of morphometric studies using different bodyside data are to be compared. Although applicability and usability of morphometric methods have been analysed (Arnqvist & Martensson 1998;Petrtýl et al 2014, Takács et al 2016, some trivial and basic issues have still not been clarified in detail. For example, whether there are any "systematic" differences in the separation power of the datasets derived from the opposite bodyside.…”