The cranial morphometrics of the wildfowl (Anatidae)

Pecsics, Tibor; Laczi, Miklós; Csörgő, Tibor

doi:10.1515/orhu-2017-0004

Cited by 15 publications

(18 citation statements)

References 36 publications

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“…Various studies on habitat use by community of ducks showed separation of niches between species in horizontal dimensions, such as size of wetlands, vegetation characteristics, and chemical characteristics of water (Bengston 1971, Weller 1975, Toft et al 1982, Anderson & Ohmart 1988, Monda & Ratti 1988, Bergan & Smith 1989, Nummi & Poysa 1993, Nudds et al 1994. Ferruginous Duck is belonging to the omnivore diving ducks according to diet composition and feeding methods (Pecsics et al 2017). Some studies demonstrate the presence of vertical partitioning in foraging methods in the depths of water column.…”

Section: Discussionmentioning

confidence: 99%

Diurnal feeding strategies of the Ferruginous Duck (Aythya nyroca) in Lake Tonga (Northeastern Algeria)

et al. 2019

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Although the Ferruginous Duck (Aythya nyroca) has thoroughly been studied, the foraging behaviour of this species is still not completely known. In the present paper we studied the diurnal feeding behaviour of ducks. We monitored the annual cycle of birds through two fieldtrips per month. The instantaneous behaviour of birds was recorded in regular 30-minute intervals from 7 a.m. to 4:30 p.m., amounting a total of 456 observation hours. Food searching activity corresponds to a quarter of the total diurnal time budget of the Ferruginous Duck. Foraging behaviour was classified into five categories dominated by the “diving”, which is almost 45.61% of the total search time. Foraging activities at the water surface considered to be secondary activities, including feeding by “bill”, “neck and head”, and “beak and head” in a rate of 19.86%, 14.53%, and 13.98%, respectively. The “toggle” remains a minor activity and represents only 5.99% of foraging time. The feeding behaviour of this species correlated to several environmental parameters (rainfall, temperature and wind velocity), and linked to the group size of ducks visiting the lake. Regarding the food intensity, our results show the highest values for “bill and head” behaviour. “Diving” has the longest feeding interval (16.16±14.1 minutes), while foraging by “bill” has the shortest (0.69 ± 0.48 minutes).

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Section: Discussionmentioning

confidence: 99%

Diurnal feeding strategies of the Ferruginous Duck (Aythya nyroca) in Lake Tonga (Northeastern Algeria)

et al. 2019

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“…As Pecsics et al (2017) found that some cranial measures are related to the feeding method, the variation of the lacrimal with regard to the rest of the skull makes possible to use this structure for species identification (Ellrott & Schmitz, 2010).…”

Section: Discussionmentioning

confidence: 99%

“…The morphotypes do not match exactly groups based on ecology or habits. For example, Pecsics, Laczi, Nagy, and Csörgő (2017) clusters anatids in six groups by feeding methods: grubbing, grazing, dabbling, upending, diving and pursuit diving. Taxa of the three morphotypes can be classified as grubbers or grazers ( Chauna , Branta , Chloephaga ), or as divers ( Biziura , Oxyura , Somateria ), dabblers and upending feeders can be found in Types II and III ( Cygnus , Lophonetta ).…”

Section: Discussionmentioning

confidence: 99%

“…Taxa of the three morphotypes can be classified as grubbers or grazers ( Chauna , Branta , Chloephaga ), or as divers ( Biziura , Oxyura , Somateria ), dabblers and upending feeders can be found in Types II and III ( Cygnus , Lophonetta ). As Pecsics et al (2017) found that some cranial measures are related to the feeding method, the variation of the lacrimal with regard to the rest of the skull makes possible to use this structure for species identification (Ellrott & Schmitz, 2010).…”

Section: Discussionmentioning

confidence: 99%

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The lacrimal/ectethmoid region of waterfowl (Aves, Anseriformes): Phylogenetic signal and major evolutionary patterns

Mendoza

Gómez

Tambussi

2020

Journal of Morphology

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Waterfowl (Aves, Anseriformes) constitute an ancient global radiation, and understanding the pattern and timing of their evolution requires a well-corroborated phylogeny including extant species and fossils. Following the molecular advances in avian systematics, however, morphology has often been held as misleading, yet congruence with molecular data has been shown to vary considerably among different skeletal parts. Here, we explore phylogenetic signal in discrete characters of the lacrimal/ectethmoid region of waterfowl, which is highly variable among species and constitutes a rich source of data. We do so by combining cladistic and multivariate approaches, and using phylogenetic comparative methods. We quantitatively recognize three major morphological types among lacrimal bones, and discuss homoplasy and potential synapomorphies of major clades using a molecular backbone tree. Our results clearly indicate that the lacrimal bone carries substantial phylogenetic signal and could be of systematic value at different levels of the phylogeny of waterfowl, feeding the exploration of other regions of the skull with this combined approach.

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“…The variation of cranial morphology is analysed using landmark-based geometric morphometry. In our former study, we used conventional morphometric variables which were selected a priori (Pecsics et al 2017), however in this case the meaningful variables are discovered by the analysis presented in a more recent study (Pecsics et al 2018). We should not choose them before the analysis.…”

Section: Landmarks and Proceduresmentioning

confidence: 99%

Analysis of skull morphometric characters in diurnal raptors (Accipitriformes and Falconiformes)

et al. 2019

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Diurnal birds of prey (Accipitriformes and Falconiformes) has traditionally been known as comprising a single order. Recently, this classification has been used in the non-taxonomic sense as referring to a convergent group of birds that are largely classified as predatory birds. Although these birds are similar in their morphology, the species differ in their foraging methods and prey preference. The cranial shape and the physical attributes determine the efficiency of the resource use. The aim of this study is to increase our knowledge of the relationship between skull shape, prey preference, and foraging habits. A geometric morphometric approach was used to analyse two-dimensional cranial landmarks. We used principal component (PC) analyses on measurements that may be related to prey preference and foraging habits. The PCs are resulted described the relative height of the skull and beak, the variation in the relative size, the orientation and robustness of the lacrimal bone, the variation in the relative size of the neurocranium compared to the viscerocranium, and the orientation of the palatine bone. The dietary categories significantly overlap. The skull morphology reflects more on foraging habits than diet or prey preference.

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The cranial morphometrics of the wildfowl (Anatidae)

Cited by 15 publications

References 36 publications

Diurnal feeding strategies of the Ferruginous Duck (Aythya nyroca) in Lake Tonga (Northeastern Algeria)

Diurnal feeding strategies of the Ferruginous Duck (Aythya nyroca) in Lake Tonga (Northeastern Algeria)

The lacrimal/ectethmoid region of waterfowl (Aves, Anseriformes): Phylogenetic signal and major evolutionary patterns

Analysis of skull morphometric characters in diurnal raptors (Accipitriformes and Falconiformes)

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