Geometric morphometric analysis of head shape variation in four species of hammerhead sharks (Carcharhiniformes: Sphyrnidae)

Cavalcanti, Mauro José

doi:10.1007/978-3-662-08865-4_8

Cited by 14 publications

(20 citation statements)

References 25 publications

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“…Analyses of shape data was conducted with MorphoJ (Klingenberg, 2011) and PAST (Hammer, Harper & Ryan, 2001). Because size is known to influence shape through ontogenetic stages and allometric trajectories (Cavalcanti, 2004;Zelditch, Lundrigan & Garland, 2004) and we might have size differences among our studied species, we performed all analysis on the residuals from a regression of shape on centroid size. Those residuals are shape values from which the effects of size have been removed (Klingenberg, 2011).…”

Section: Methodsmentioning

confidence: 99%

Get a grip—evolution of claw shape in relation to microhabitat use in intertidal arthropods (Acari, Oribatida)

Pfingstl

Kerschbaumer

Shimano

2020

PeerJ

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Claws may be the most common biological attachment devices in animals but relatively few studies have examined the ecological and evolutionary significance of their morphology. We performed the first geometric morphometric investigation of arthropod claws using 15 intertidal oribatid mite species from two different families living in three different habitat types to determine if claw shape is correlated with ecology. Our results show that species living on rocky shores show remarkably high and strongly curved claws while species from mangrove habitats show significantly lower and less curved claws. Euryoecious species are able to dwell in a wide range of habitats and show an intermediate claw type. These results indicate a strong relationship between claw shape and microhabitat and the best predictors of microhabitat use seem to be claw height and curvature. Claw length varied to some degree among the species but without any noticeable ecological pattern. A comparison with terrestrial and freshwater aquatic oribatid mite species, on the other hand, confirms that their claws are only half as long as that of intertidal mites and it is suggested that tidal flooding and wave action strongly selects for long claws. In this microarthropod group which occupies a vast array of microhabitats, claw morphology may play an important role in niche separation and hence demonstrate the importance of ecomorphological studies.

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Section: Methodsmentioning

confidence: 99%

Get a grip—evolution of claw shape in relation to microhabitat use in intertidal arthropods (Acari, Oribatida)

Pfingstl

Kerschbaumer

Shimano

2020

PeerJ

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“…The analyses were carried sensu Cavalcanti (2004). One of the outputs is the weight matrix ‘ W ’, where the uniform and non‐uniform (partial warps) components of shape are estimated.…”

Section: Methodsmentioning

confidence: 99%

Are you what you eat? A geometric morphometric analysis of gekkotan skull shape

Daza

Thomas

Claudio

2009

Biological Journal of the Linnean Society

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The morphological variation of the gekkotan skull, as visualized through dorsal and lateral views of a large sample of skulls (164 species; 68% of all gekkotan genera), was analysed using geometric morphometrics. We describe skull changes using variables associated with the contour variations (uniform components), as well as localized changes (partial warps). We defined dietary categories based on the available information for 105 species. These categories, together with phylogenetic affinities, were used as descriptors of the skull shape variables in subsequent statistical analyses. Changes based on the morphological variables are described and discussed in an ecological and phylogenetic context. We consider that this new information relating gekkotan phylogeny and diet will be useful in future phylogenetic analyses of this group.

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“…Tako, od "Revolucije u morfometriji" (Rohlf & Marcus, 1993), pa do očekivanja da postane nova "tradicionalna" morfometrija (Adams et al, 2004), geometrijska morfometrija nalazi primenu u najrazličitijim taksonomskim, ekološkim i evolucionim studijama varijabilnosti veličine i oblika tela (Corti & Croseti, 1996;Loy et al, 1996Loy et al, , 1998Loy et al, , 1999aLoy et al, , 2000aWalker, 1997;Cavalcanti et al, 1999;Sará et al, 1999;Douglas et al, 2001;Rüber & Adams, 2001;Trapani, 2003;Klingenberg et al, 2003;Winans et al, 2003;Kassam et al, 2004;Gray et al, 2005;Nolte & Sheets, 2005;Johansson et al, 2006;Lopes et al, 2006;Collyer et al, 2007;Costa & Cataudella, 2007;Rincón et al, 2007;Maderbacher et al, 2008;Elmer et al, 2010;Hayden et al, 2010;Dornburg et al, 2011), pojedinih telesnih regiona (Loy et al, 1999b;Cavalcanti, 2004;Johansson et al, 2006;Krabbenhoft et al, 2009;Aguilar-Medrano et al, 2011;Dornburg et al, 2011;García-Rodríguez et al, 2011;Parsons et al, 2011;Frédérich et al, 2012), kao i glavenog skeleta riba (Frédérich et al, 2008a,b;…”

Section: Geometrijska Morfometrijaunclassified

Ecological characteristics and morphological-genetic differentiation in populations of European mudminnoow (Umbra krameri Walbaum, 1792) from Ba?ka, Ma?va and Semberija

Sekulić¹

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Geometric morphometric analysis of head shape variation in four species of hammerhead sharks (Carcharhiniformes: Sphyrnidae)

Cited by 14 publications

References 25 publications

Get a grip—evolution of claw shape in relation to microhabitat use in intertidal arthropods (Acari, Oribatida)

Get a grip—evolution of claw shape in relation to microhabitat use in intertidal arthropods (Acari, Oribatida)

Are you what you eat? A geometric morphometric analysis of gekkotan skull shape

Ecological characteristics and morphological-genetic differentiation in populations of European mudminnoow (Umbra krameri Walbaum, 1792) from Ba?ka, Ma?va and Semberija

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