Diallel Analysis of Root Shape of Japanese Radish (Raphanus sativus L.) Based on Elliptic Fourier Descriptors.

Iwata, Hiroyoshi; Niikura, Satoshi; Matsuura, Seiji; Takano, Yasushi; Ukai, Yasuo

doi:10.1270/jsbbs.50.73

Cited by 102 publications

(120 citation statements)

References 15 publications

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“…The digitized images were then subjected to elliptical Fourier analysis in the program SHAPE (Iwata and Ukai 2002). Only the first 20 harmonics were included in the statistical analysis, as these were responsible for over 99% of the shape variation (Iwata et al 1998). This resulted in 77 (20×4-3=77) Fourier Descriptors (FDs).…”

Section: Methodsmentioning

confidence: 99%

Otolith retrieval from faeces and reconstruction of prey-fish size for Great Cormorant (Phalacrocorax carbo) wintering at the East Dongting Lake National Nature Reserve, China

Radhakrishnan

Liu

et al. 2010

Environ Biol Fish

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The food composition of Great Cormorant (Phalacrocorax carbo) was studied by analyzing 360 faecal samples collected from their roosting sites at the East Dongting Lake National Nature Reserve in south-central China during November 2008 and January 2009. A total of 223 fish otoliths were retrieved. Only sagittal otoliths (N=74) with intact margins, good medial relief, and well-defined sulcus were used to identify the prey-fish species and to reconstruct prey-fish size. Through shape indices and elliptical Fourier analyses, these otoliths were identified as belonging to two cyprinid fish species, crucian carp Carassius auratus (72%) and white amur bream Parabramis pekinensis (28%). The otolith size (maximum length, Lo)-prey-fish size (standard length, Ls) relationships determined for the two fish species were Ls=−19. 5+37.1 Lo (N=74; R 2 =0.95; P<0.05) for crucian carp and Ls=−31.9+ 36.9 Lo (N=70; R 2 =0.97; P<0.05) for white amur bream. The back-calculated Ls from the otoliths retrieved from the faeces were 96.2±10.2 mm (range 72.7-110.4 mm) for crucian carp and 86.3±10.4 mm (range 74.1-104.6 mm) for white amur bream. Based on setnet sampling of the fish community near roosting sites, crucian carp and white amur bream were found as the first and second most abundant species. Great Cormorants were very selective for the size range of prey. These results demonstrate that analysis of otoliths retrieved from faeces can be an effective, inexpensive, and non-invasive method to identify prey-fish species and to estimate prey-fish size in studies of diet composition for piscivorous birds.

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Section: Methodsmentioning

confidence: 99%

Otolith retrieval from faeces and reconstruction of prey-fish size for Great Cormorant (Phalacrocorax carbo) wintering at the East Dongting Lake National Nature Reserve, China

Radhakrishnan

Liu

et al. 2010

Environ Biol Fish

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“…The 80 coefficients could be classified into two groups related to symmetrical variation (40 coefficients, hereafter referred to as group A) and asymmetrical variation (40 coefficients, group B) (Iwata et al, 1998;Yoshioka et al, 2004). To summarise the information contained in the coefficients in each group, we performed a PCA based on a variance-covariance matrix.…”

Section: Methodsmentioning

confidence: 99%

“…The application of EFDs to plant organ shape analysis was first attempted by White et al (1988) in Betula leaf. EF-PCA, as suggested by Rohlf and Archie (1984), has been applied to the evaluation of several plant organs, such as Begonia leaf (McLellan, 1993), soybean leaflet (Furuta et al, 1995), buckwheat kernel (Ohsawa et al, 1998), radish root (Iwata et al, 1998), yam tuber (Toyohara et al, 2000) and citrus leaf . Recently, developed a software package, 'SHAPE', for the quantitative evaluation of biological shapes on the basis of EF-PCA.…”

Section: Introductionmentioning

confidence: 99%

Quantitative evaluation of the petal shape variation in Primula sieboldii caused by breeding process in the last 300 years

et al. 2005

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Primula sieboldii (E. Morren) has been a popular garden plant at least since the Edo period, about 300 years ago. We compared petal form between cultivars and wild populations in order to characterise the changes that have occurred during domestication. The comparison was made using EF-PCA analysis, which describes overall petal shape mathematically by transforming petal contour coordinates into elliptic Fourier descriptors; it subsequently summarises these descriptors by principal component analysis (PCA). Rearing cultivars in a common-garden experiment identified the PCs with a substantial genetic element. A clear heritable component was detected for the PCs characterising symmetrical variation in flower shape, but not the asymmetrical variation. Wild populations of this species have become endangered owing to habitat destruction by human activity, and many lowland floodplain habitats have been lost. Variation within the remaining wild populations was significantly lower than in the cultivars for PC1 (aspect ratio), PC3 (curvature of proximal and distal parts) and petal area; but not for PC2 (depth of head notch) and PC4 (position of the centre of gravity). The shifts in petal form from the wild populations to the cultivars parallel those seen in other croptypes following domestication, including an increase in size and diversity of forms: cultivars have shallower head notches, more fan-shaped petals and larger petals than do wild P. sieboldii. Heredity (2005) 94, 657-663.

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“…Further calculations were performed using 11 harmonics (see grey boxes). information about elongation (Iwata et al, 1998;Michaux et al, 2007;Helvaci et al, 2012).…”

Section: Extraction Of Morphological Datamentioning

confidence: 99%

Unsupervised model-based clustering for typological classification of Middle Bronze Age flanged axes

Wilczek

Monna

Gabillot

et al. 2015

Journal of Archaeological Science: Reports

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Diallel Analysis of Root Shape of Japanese Radish (Raphanus sativus L.) Based on Elliptic Fourier Descriptors.

Cited by 102 publications

References 15 publications

Otolith retrieval from faeces and reconstruction of prey-fish size for Great Cormorant (Phalacrocorax carbo) wintering at the East Dongting Lake National Nature Reserve, China

Otolith retrieval from faeces and reconstruction of prey-fish size for Great Cormorant (Phalacrocorax carbo) wintering at the East Dongting Lake National Nature Reserve, China

Quantitative evaluation of the petal shape variation in Primula sieboldii caused by breeding process in the last 300 years

Unsupervised model-based clustering for typological classification of Middle Bronze Age flanged axes

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