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| Registros recuperados: 11 | |
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| Nedeljković, Z.; Ačanski, J.; Đan, M.; Obreht-Vidaković, D.; Ricarte, A.; Vujić, A.. |
| Integrative taxonomy tests the validity of taxa using methods additional to traditional morphology. The existence of two different morphotypes in specimens identified as Chrysotoxum vernale Loew (Diptera: Syrphidae) prompted their taxonomic study using an integrative approach that included morphology, wing and male-surstylus geometric morphometrics, genetic and ecological analyses. As a result, a new species is recognised, Chrysotoxum montanum Nedeljković & Vujić sp. nov., and C. vernale is re-defined. A lectotype and paralectotypes are designated for C. vernale to stabilize this concept. An additional species, Chrysotoxum orthostylum Vujić sp. nov., with distinctive male genitalia is also described. The three species share an antenna with the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Balkan Peninsula; C. montanum sp. nov.; C. orthostylum sp. nov.; Ecological niche; Geometric morphometry; Lectotype; MtDNA COI sequences; Syrphinae; 42.75; 42.64; 42.62. |
| Ano: 2015 |
URL: http://www.repository.naturalis.nl/record/578954 |
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| Pleguezuelos, J.M.; Fernández-Cardenete, J.R.; Honrubia, S.; Feriche, M.; Villafranca, C.. |
| In many vertebrates, foraging mode (active versus sit-and-wait) is tied to some traits of their natural history such as morphology, type of prey, rate of food acquisition, and survival rate. We explore the correlates between some morphological traits of a Mediterranean colubrid and its feeding ecology and the predation risk, by comparing data on teeth number, tail damage, and diet. A large sample (n = 368) of the Ladder Snake, Rhinechis scalaris is used. The species feeds almost exclusively on endotherms, mainly mammals (nearly 95% of the diet in mass), which set R. scalaris among the most stenophagous snakes in the western Palaearctic. There is also a high percentage of motionless prey in the diet (up to 50% in prey mass), such as nestling birds, mammals... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Feeding habits; Teeth number; Tail breakage; Spain; 42.82; 42.62. |
| Ano: 2007 |
URL: http://www.repository.naturalis.nl/record/256128 |
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| Chen, W.-M.; Lee , Y.-F.; Tsai, C.-F.; Yao, C.-T.; Chen, Y.-H.; Li, S.-H.; Kuo, Y.-M.. |
| Many birds in breeding seasons engage in vigorous dawn singing that often turns to a prominent chorus. We examined dawn chorus variation of avian assemblages in a tropical montane forest in Taiwan and tested the hypothesis that onset sequence is affected by eye sizes, foraging heights, and diet of birds. Chorus onset and duration varied between sampling months, but generally peaked in the prime breeding season. Overall dawn chorus length increased with, but mean duration per species was negatively correlated with, species richness. The inter-correlation among trait variables in phylogenetic independent contrasts was calculated and examined. Both foraging height and relative eye size were selected as positively explanatory factors, but no dietary effects... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Breeding; Canopy; Diets; Eye size; Foraging; Perch; Taiwan; Tropical forests; Birds; 42.83; 42.62. |
| Ano: 2015 |
URL: http://www.repository.naturalis.nl/record/578950 |
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| Liu, M.; Ma, N.; Hua, B.-Z.. |
| Wing shape variation was investigated between the sexes and among four populations of the scorpionfly Dicerapanorpa magna (Chou, 1981) endemic to the Qin-Ba Mountains area, China through the landmark-based geometric morphometric approach. The results show that sexual dimorphism exists both in wing size and shape in D. magna. Significant differences exist in female wing size and shape among D. magna populations. The possible reasons of the wing variation are discussed based on the divergence time of D. magna in combination with the tectonic and climatic events in the Qin-Ba Mountains during the late Miocene-Pleistocene period. Whether reproductive isolation exists between different populations needs further research. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Canonical variates analysis; Individual variation; Sexual dimorphism; 42.75; 42.62. |
| Ano: 2016 |
URL: http://www.repository.naturalis.nl/record/588735 |
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| Beaufort, L.F. de. |
| I have often been puzzled about the remarkable change of colour in the roedeer, a species that I can watch almost daily from my house. In the winter the greyish brown coat can hardly be distinguished against the dull, brownish shrubby wood, at the border of which they come to feed. The only visible part of the animal is the white patch on their hindquarters. It is known that this patch is a guiding mark for the young to follow their mother. Some years ago a roedeer calf followed a boy on a bicycle with a white mudguard even to the boy's house. We may take it that also adults follow the leader by this mark. In the summer, on the contrary, the bright reddish coat makes the roedeer very conspicuous against the bright green background. I know how dangerous it... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.62. |
| Ano: 1964 |
URL: http://www.repository.naturalis.nl/record/318291 |
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| Guidi, L.; Todaro, M.A.; Ferraguti, M.; Balsamo, M.. |
| The reproductive system and the spermatozoon of Megadasys sterreri from Lanzarote (Canary Islands, Spain) were studied at structural and ultrastructural levels. The species is a simultaneous hermaphrodite with cross-fertilization and shows paired gonads, the male anterior and the female posterior, and both gametes mature in a caudo-cephalic direction. Sperm ducts converge on the midline and open into a ventral common pore. Two sexual accessory organs are present in the caudal trunk. A pipe-like frontal organ lies between the ovaries and the caudal organ, and is composed of a long, thin region connected to a large zone containing mature and degenerating spermatozoa. The cigar-like caudal organ is elongate, bulky and is made of an anterior glandulo-muscular... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Cephalodasyidae; Phylogeny; Planodasyidae; Reproductive traits; Spermatogenesis; 42.79; 42.62. |
| Ano: 2014 |
URL: http://www.repository.naturalis.nl/record/471589 |
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| Özgül-Siemund, A.; Ahrens, D.. |
| Female genitalia are widely underrepresented in taxonomic studies. Here we investigate the morphological variation among female copulation organs for a group of scarab beetles (Sericini) with similar ecology, external morphology and copulation mechanics. We examined traits qualitatively and quantitatively based on 80 and 18 species (genus Pleophylla), respectively. Additionally we explored whether female genitalia are affected by asymmetry. The vast diversity of slerotised structures including their shapes illustrated the high taxonomic and phylogenetic utility of female genitalia in this group. The morphometric analysis of Pleophylla, confirmed that sclerotisations in the ductus bursae are very suitable for species-level taxonomic purposes. Stable... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Beetles; Female genitalia; Integrative taxonomy; Melolonthinae; Morphology; 42.75; 42.64; 42.62. |
| Ano: 2015 |
URL: http://www.repository.naturalis.nl/record/579124 |
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| Taylor, L.A.; Müller, D.W.H.; Schwitzer, C.; Kaiser, T.M.; Codron, D.; Schulz, E.; Clauss, M.. |
| Tooth wear can affect body condition, reproductive success and life expectancy. Poor dental health is frequently reported in the zoo literature, and abrasion-dominated tooth wear, which is typical for grazers, has been reported in captive browsing ruminants. The aim of this study was to test if a similar effect is evident in captive rhinoceros species. Dental casts of maxillary cheek teeth of museum specimens of captive black (Diceros bicornis; browser), greater one-horned (Rhinoceros unicornis; intermediate feeder) and white rhinoceroses (Ceratotherium simum; grazer) were analysed using the recently developed extended mesowear method for rhinoceroses. Captive D. bicornis exhibited significantly more abrasion-dominated tooth wear than their free-ranging... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Rhinoceros; Mesowear; Tooth wear; Captivity; Nutrition; Browser; Grazer; 42.84; 42.62. |
| Ano: 2014 |
URL: http://www.repository.naturalis.nl/record/471325 |
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| Cotoras, D.D.; Allende, M.L.. |
| The structural origin of the vertebrates’ paired limbs is still an unsolved problem. Historically, two hypotheses have been raised to explain the origin of vertebrate limbs: the Archipterygium Hypothesis and the Fin Fold Hypothesis. Current knowledge provides support for both ideas. In the recent years, it has been also suggested that (1) all appendages correspond to body axis duplications and (2) they are originated by the ventralization of the developmental program present in the median fins. The tail bud is also a relevant structure in the attempt to understand the origin of the vertebrates’ limbs. Due to their similarities in gene expression and general organization, both structures should be studied more closely to understand their potential... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Archipterygium hypothesis; Co-option; Fin fold hypothesis; Limb bud; 42.62; 42.80. |
| Ano: 2015 |
URL: http://www.repository.naturalis.nl/record/587650 |
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| Registros recuperados: 11 | |
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