Thèses sur le sujet « Lizards »
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McElroy, Eric J. « The Functional Morphology of Lizard Locomotion : Integrating Biomechanics,Kinematics, Morphology, and Behavior ». Ohio : Ohio University, 2008. http://www.ohiolink.edu/etd/view.cgi?ohiou1213879506.
Texte intégralFord, Stewart S. « Kidney form and function and the role of arginine vasotocin (AVT) in three agamid lizards from different habitats in Western Australia / ». Connect to this title, 2005. http://theses.library.uwa.edu.au/adt-WU2006.0008.
Texte intégralFord, Stewart S. « Kidney form and function and the role of agrinine vasotocin (AVT) in three agamid lizards from different habitats in Western Australia ». University of Western Australia. School of Animal Biology, 2005. http://theses.library.uwa.edu.au/adt-WU2006.0008.
Texte intégralStanley, Edward Leo. « Evolutionary relationships within the family Cordylidae (Squamata) ». Click here for download, 2009. http://proquest.umi.com/pqdweb?did=1848731751&sid=1&Fmt=2&clientId=3260&RQT=309&VName=PQD.
Texte intégralHolm, Peter 1959. « Two populations of the tree lizard (Urosaurus ornatus) in southern Arizona ». Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276767.
Texte intégralClemente, Christofer. « Evolution of locomotion in Australian Varanid lizards (Reptilia : Squamata : Varanidae) : ecomorphological and ecophysiological considerations ». University of Western Australia. School of Animal Biology, 2006. http://theses.library.uwa.edu.au/adt-WU2007.0044.
Texte intégralFischer, Joern. « Beyond fragmentation : lizard distribution patterns in two production landscapes and their implications for conceptual landscape models / ». View thesis entry in Australian Digital Theses Program, 2004. http://thesis.anu.edu.au/public/adt-ANU20060718.150101/index.html.
Texte intégralDebraga, Michael. « Anatomical and functional changes between terrestrial varanoid lizards and aquatic mosasaurs ». Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59631.
Texte intégralThe taxonomic position of the Aigialosauridae within the superfamily Varanoidea is evaluated. Based on character states previously used to define the Varanoidea, neither the specific affinities of aigialosaurs nor the sister-group relationships of earlier members of the terrestrial varanoid assemblage can be securely established. For this reason, the specific character states involved have been reexamined and alternative hypotheses of relationship have been considered.
Warner, Daniel Augustus. « Phenotypes and Survival of Hatchling Lizards ». Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/31023.
Texte intégralMaster of Science
Sherbrooke, Wade Cutting. « Integumental biology of horned lizards (Phrynosoma) ». Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184327.
Texte intégralBanzato, Tommaso. « Diagnostic Imaging in Snakes and Lizards ». Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3422622.
Texte intégralNegli ultimi anni ofidi e sauri sono diventati sempre più diffusi come animali da compagnia. Questa crescente diffusione ha comportato un aumento della richiesta di servizi veterinari specializzati in questi animali. L’imaging diagnostico spesso è una parte fondamentale dell’indagine clinica. La corretta interpretazione delle immagini diagnostiche implica una conoscenza approfondita dell’anatomia, fisiologia e patologia della specie oggetto dell’indagine clinica. Il confronto tra immagini normali e immagini patologiche spesso è di vitale importanza per una corretta interpretazione delle immagini diagnostiche. Lo scopo di questa tesi di dottorato è quella di fornire degli atlanti che mettano in relazione l’anatomia normale e per sezioni con le corrispondenti immagini radiografiche, tomografiche e ecografiche di alcune delle specie più popolari di ofidi e sauri. Il Capitolo I è riportata una revisione della letteratura corrente sull’imaging in ofidi e sauri. Al momento manca un riferimento univoco su questo argomento e la letteratura presente è spesso frammentaria a volte difficile da reperire. L’obiettivo di questo capitolo, quindi, è quello di fare il punto sullo stato dell’arte della diagnostica per immagini in ofidi e sauri. Molti articoli internazionali riguardanti la radiologia, l’ecografia, la tomografia computerizzata, la risonanza magnetica e altre tecniche di imaging sono stati citati in modo da creare un riferimento utile ai clinici che si occupano di animali esotici. Nel Capitolo II vengono presentati gli obiettivi scientifici e la struttura di questa tesi. L’obiettivo generale è quello di fornire una descrizione dell’anatomia e dell’imaging normale in ofidi e sauri. La prima parte (Capitoli III e IV) è incentrata sul confronto tra la l’anatomia normale e per sezioni della testa alcune specie di ofidi e sauri con i normali aspetti radiografici e tomografici. La seconda parte (Capitoli dal V al VII) è incentrata sull’imaging della cavità celomatica. In questi capitoli sono descritti: gli aspetti normali valutati in tomografia computerizzata della cavità celomatica di alcune specie di sauri, l’ecografia normale in alcune specie di ofidi e il Nel Capitolo III sono descritti i normali aspetti anatomici, radiografici e tomografici della testa del Boa constrictor. Per questo studio sono stati impiegate le teste di 4 cadaveri di Boa constrictor. Utilizzando una combinazione pellicola-casetta ad alta definizione sono state ottenute proiezioni latero-laterali e dorso-ventrali di tutte le teste. L’esame tomografico è stato eseguito in direzione cranio-caudale e latero-laterale con uno spessore di fetta di 1,5mm. Le immagini sono state visualizzate in una finestra da osso. 2 teste sono state dissezionate con un approccio stratigrafico. 2 teste invece sono state congelate per 24 ore a -20°C e poi sezionate in fette di 3mm rispettando il protocollo utilizzato in tomografia computerizzata. Le strutture anatomiche sono state identificate nelle immagini anatomiche e poi accoppiate con le corrispondenti immagini radiografiche e tomografiche. I tessuti ossei sono ben definiti sia nelle immagini radiografiche che tomografiche; i tessuti molli risultano poco definiti in entrambe. Nel Capitolo IV l’anatomia stratigrafica e per sezioni della testa dell’iguana, del tegu e del drago barbuto vengono messi in relazione con il loro normale aspetto radiografico e tomografico. Per realizzare questo studio sono stati usati 4 cadaveri per specie e 6 iguane, 4 tegu e 3 draghi barbuti adulti. Prima di iniziare gli studi di imaging 2 cadaveri per specie sono stati dissezionati con un approccio stratigrafico e 2 sono stati sezionati. Gli studi anatomici sono stati eseguiti con la stessa metodica riportata nel Capitolo III. Gli studi radiografici e tomografici sono stati eseguiti solo sugli animali vivi. Le radiografie sono stata scattate in proiezione latero-laterale e dorso-ventrale. Le scansioni tomografiche sono state effettuate pre e post contrasto scansionando gli animali in direzione cranio-caudale. Le immagini tomografiche sono state quindi visualizzate sia in finestra da tessuti molli che da osso. Le strutture anatomiche sono state individuate prima nelle immagini anatomiche e poi correlate con le corrispondenti immagini radiografiche e tomografiche. Gli studi radiografici hanno permesso di visualizzare in maniera ottimale sia i tessuti duri che i tessuti molli (specialmente nell’iguana). Negli studi tomografici le strutture ossee sono state visualizzate in modo ottimale in tutte le specie. I tessuti molli sono chiaramente delineati solo nell’iguana; nel tegu e nel drago barbuto si riescono a distinguere chiaramente solo gli occhi. Nel Capitolo V i normali aspetti anatomici della cavità celomatica dell’iguana verde, del tegu bianco e nero e del drago barbuto sono messi in relazione con i normali aspetti tomografici di queste specie. Per questo studio sono stati usati 4 cadaveri e 4 animali vivi per specie. I cadaveri sono stati congelati per 24 ore e poi sezionati a intervalli di 5mm. Le fette così ottenute sono state lavate da entrambi i lati e poi fotografate. Per ridurre la durata delle procedure diagnostiche sono state effettuate solo procedure post-contrasto. Le scansioni tomografiche sono state effettuate in direzione cranio-caudale. Le immagini tomografiche sono state visualizzate in finestra da tessuti molli e da polmoni. La maggior parte degli organi celomatici sono stati individuati sia nelle immagini anatomiche che nelle immagini tomografiche. Il risultato di questo lavoro è un atlante degli aspetti anatomici e tomografici normali della cavità celomatica di queste specie di sauri. Nel Capitolo VI vengono descritti gli aspetti ultrasonografici normali della cavità celomatica del Boa constrictor, Python molurus, Python curtus e Python regius. Inoltre vengono fornite le misure ecografiche di riferimento delle scent glands e delle mucose gastica, pilorica e del colon nelle suddette specie. Per questo lavoro sono stati utilizzati 46 serpenti vivi (16 Python regius, 10 Python molurus, 12 Python curtus and 8 Boa constrictor) and 23 cadaveri (6 Python regius, 4 Python molurus, 10 Python curtus, 3 Boa constrictor). Gli studi anatomici sono stati effettuati prima di iniziare gli studi ecografici in modo da caratterizzare i normali aspetti anatomici di queste specie. In un lavoro precedente, nel quale vengono descritti i normali aspetti ecografici del Boa constrictor, viene proposto un approccio ventrale al paziente. In questo studio proponiamo un approccio laterale. In alcune immagini ecografiche i coni d’ombra prodotti dalle coste di questi animali, specialmente nei soggetti di maggiori dimensioni, degradavano leggermente la qualità dell’esame. Nonostante ciò è stato possibile riconoscere la maggior parte degli organi celomatici (scent glands, emipeni, cloaca, ureteri, colon, piccolo e grosso intestino, piloro, stomaco, pancreas, fegato, cistifellea ed esofago). Il numero di animali nei quali i singoli organi sono stati visualizzati è stato riportato. Questo lavoro ha prodotto una descrizione completa degli aspetti ecografici normali in alcune specie di boidi oltre a una serie di tavole che mettono in relazione l’anatomia normale e per sezioni con le corrispondenti immagini ecografiche. Nel Capitolo VII è riportata la tecnica e gli aspetti normali dello studio radiografico dell’esofago, stomaco e piccolo intestino nel Python regius. Per caratterizzare l’aspetto normale del piccolo intestino di questa specie i cadaveri di 10 Python regius sono stati dissezionati prima dei iniziare procedure diagnostiche. Per questo lavoro sono stati utilizzati 18 Python regius. Tutti gli animali utilizzati non sono stati nutriti nella settimana precedente lo studio. Gli animali sono stati divisi in 3 gruppi (A, B, C). Il mezzo di contrasto (bario solfato) è stato somministrato alla dose di 25ml/kg tramite una sonda esofagea a concentrazione crescente (25%, 35%, 45% p/v) nei tre gruppi. Un soggetto appartenente al gruppo A (25% p/v) è stato usato per verificare la fattibilità della procedura e per stabilire una timeline radiografica approssimativa per gli studi successivi. La qualità delle immagini diagnostiche è stata valutata da tre autori in basi a criteri pre-definiti. I risultati di questo studio suggeriscono che la concentrazione ideale di mezzo contrasto per questo tipo di indagine diagnostica è del 35%. Inoltre, sono stati descritti tre pattern di distribuzione del mezzo di contrasto nel piccolo intestino, indipendenti dalla concentrazione.
Alblas, Amanda. « Cloacal glands of the group-living lizard, Cordylus cataphractus (Sauria : Cordylidae) ». Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49884.
Texte intégralENGLISH ABSTRACT: Standard histological procedures revealed that there are two types of glands in the cloacal complex of the viviparous Cordylus cataphractus. These occur in the urodeal region of the complex (called urodeal glands), and in the posterior proctodeum region (called proctodeal glands). Urodeal glands are found in females only and differentiate at sexual maturity. Proctodeal glands occur in both sexes and the dorsal and ventral proctodeal glands are identical in structure. Seasonal activity in cloacal gland structure and secretory was studied. Urodeal glands show distinct seasonal variation in development and secretory activity, they become enlarged in vitellogenic females, remain active during pregnancy, with glandular activity peaking around parturition. Proctodeal glands, in contrast, show little or no seasonal variation in development or secretory activity in both sexes. Secretion quantity, however, is highly variable among individuals of the same sex, time of year, as well as reproductive stage, but evidently much less in females than in males. Although the possible functions of the cloacal glands are still unclear, two main functions are suggested: a) mechanical function such as lubrication or a substrate for genital products and b) pheromonal communication. I propose that urodeal glands are involved in some reproductive function rather than in social communication, because very little secretion is found during the mating season and peak glandular activity are evident around parturition. The opposite may be true for proctodeal glands, but further investigation is needed, particularly chemical analysis of secretion and behavioural manipulation, to determine the role of these glands in social communication.
AFRIKAANSE OPSOMMING: Standaard histologiese tegnieke dui aan dat daar twee tipes kliere voorkom in die kloakale kompleks van die lewendbarende akkedis, Cordylus cataphractus. Die een kliertipe word in die urodeale omgewing aangetref en staan bekend as die urodeaalkliere, terwyl die ander groep in die posterior area van die proktodeum voorkom en proktodeaalkliere heet. Urodeaalkliere word slegs in wyfies aangetref en ontwikkel eers na volwassenheid bereik is. Proktodeaalkliere kom in albei geslagte voor en dorsale en ventrale aspekte van hierdie kliere is identies aan mekaar. Die seisoenale aktiwiteit in struktuur en sekresie-aktiwiteit van hierdie kloakale kliere is ondersoek in mannetjies en wyfies wat gedurende verskillende maande van die jaar versamel is en dus in verskillende voorplantingstadia was. Urodeaalkliere het duidelike seisoenale variasie vertoon wat beide ontwikkeling van die klier en sekretoriese aktiwiteite betref. Die klier vergroot tydens vitellogenese, bly aktief tydens swangerskap en bereik maksimale aktiwiteitsvlakke rondom geboorte. In teenstelling hiermee het die proktodeaalkiere van beide geslagte weinig of self geen seisonale variasie in hul ontwikkeling of sekretoriese aktiwiteit getoon nie. Die hoeveelheid sekreet vrygestel was merkbaar minder in wyfies as in mannetjies, maar hoogs veranderlik tussen individue van dieselfde geslag of voortplantingstadium; of wat in dieselfde tydperk van die jaar versamel is. Alhoewel funksies van kloakale kliere steeds onduidelik bly, word twee hooffunksies voorgestel: a) ‘n meganiese funksie, byvoorbeeld as smeermiddel of as ‘n substraat vir geslagsprodukte en b) ‘n kommunikasie funksie, byvoorbeeld in die vrystelling van feromone. Ek stel voor dat die urodeaalkliere eerder by ‘n voortplantingsfunksie betrokke is, aangesien baie min sekreet gedurende die paarseisoen vervaardig word terwyl klieraktiwiteit rondom geboorte ‘n piek bereik. Die teenoorgestelde mag geld vir proktodeaalkliere, maar vereis verdere ondersoek. Veral ‘n chemiese analise van die sekresie en gedragsmanipulasie sal nuttig wees om ‘n moontlike rol van hierdie kliere in sosiale kommunikasie te bepaal.
Johnson, Emmy Marie. « A study on the population size and natural history of the Eastern Six-lined racerunner, aspidoscelis sexlineata, in West Virginia, with notes on other lizard species ». [Huntington, WV : Marshall University Libraries], 2008. http://www.marshall.edu/etd/descript.asp?ref=858.
Texte intégralTitle from document title page. Includes abstract. Document formatted into pages: contains 61 p.: col. ill. Includes bibliographical references (p. 58-61).
Ogden, Robert. « Speciation and differentiation in Lesser Antillean lizards ». Thesis, Bangor University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273610.
Texte intégralDonoso, Daniel Antonio Pincheira. « Adaptive radiation and speciation in Liolaemus lizards ». Thesis, University of Exeter, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489243.
Texte intégralAmaral, Maria José Aires do. « Lacertid lizards as bioindicators of agricultural contamination ». Doctoral thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/8395.
Texte intégralApesar do recente aumento no número de estudos, os lagartos persistem como um dos grupos menos estudados em ecotoxicologia e o desconhecimento em relação à sua resposta à contaminação ambiental é enorme. A nível europeu, os lacertídeos têm sido identificados como potenciais espécies modelo para a ecotoxicologia com répteis. O principal objectivo deste projecto era determinar se um lacertídeo abundante pertencente ao género Podarcis, podia ser utilizado como bioindicador de exposição e toxicidade em zonas agrícolas. Para atingir este objectivo, utilizámos uma estratégia integrada com três fases. Numa primeira fase realizou-se um estudo de campo para documentar o tipo de exposição e parâmetros populacionais de populações de lacertídeos que ocorrem em zonas de uso intenso de pesticidas e zonas de agricultura orgânica. A segunda fase consistiu num estudo de mesocosmo em que se expuseram juvenis a um conjunto de pesticidas em condições controladas durante um período de um ano. Finalmente, a terceira fase incluiu um estudo laboratorial sobre os efeitos do clorpirifos, um dos insecticidas mais utilizado a nível global, em lagartixas. No término de cada um dos estudos, analisaram-se diversos biomarcadores e parâmetros de exposição e toxicidade a pesticidas nos diferentes indivíduos. Este conjunto abrangente de parâmetros foi analisado em diferentes níveis de organização biológica, incluindo parâmetros populacionais, bem como comportamentais, fisiológicos, bioquímicos e histológicos. Em geral, detectaram-se poucas diferenças estatísticas significativas entre as populações dos campos expostos a pesticidas e populações referência. Confirmando a dificuldade que existe em isolar os efeitos de diferentes contaminantes sobre as populações de outros factores locais, ciclos sazonais ou eventos estocásticos. As populações de P. bocagei parecem ser capazes de lidar com o nível observado de exposição a pesticidas. No entanto, indivíduos que vivem em locais expostos a pesticidas parecem estar menos adaptados ecologicamente do que aqueles que vivem em locais referência, apresentando um estado de depleção nutricional e sinais de stress metabólico. Os resultados obtidos com os animais da experiência de mesocosmo parecem reforçar estes resultados. Os animais prosperaram relativamente bem em todos os mesocosmos, independentemente do tratamento ou não com pesticidas, apresentando uma ampla gama de comportamentos naturais. A abordagem laboratorial confirmou P. bocagei como um valioso indicador de exposição sub-letal a doses ambientalmente realistas de clorpirifos. De acordo, com o conjunto d resultados obtidos, P. bocagei parece ser um bioindicador adequado de exposição a pesticidas.
Lizards are among the least studied groups in ecotoxicology and despite a recent increase in the number of studies, there is still a lack of knowledge regarding their response to environmental contamination. In Europe, lacertid lizards have been identified as potential model species for reptile ecotoxicology. The main question of this project was to assess if a highly abundant lacertid lizard belonging to the genus Podarcis, could be used as a bioindicator of pesticide exposure and toxicity in agricultural areas. To achieve this end, we used a three-stage tiered approach. The first tier took the form of a field survey to document the nature of the exposure and the population parameters of lacertids occurring in areas of intensive pesticide usage as well as areas of negligible pesticide usage. The second tier consisted of a mesocosm study in which naïve lizards were exposed to pesticides in a controlled experiment. Finally, the third tier included a laboratory approach to the effects of one of the most common insecticides used worldwide, chlorpyrifos. We assessed pesticide impact in individuals from the different tiers using a comprehensive set of biomarkers applied at different levels of biological organization, including population parameters as well as behavioral, physiological, biochemical and histological biomarkers. We detected few statistically significant differences between reference and exposed populations in the field study. Confirming the difficulty to isolate the effects of contaminants on natural populations where other local factors, natural cycles or stochastic events occur. P. bocagei populations seem to be able to compensate with the observed level of pesticide exposure. Nevertheless, individuals living in exposed sites seem to be less ecologically fit than those living in reference sites, presenting a depleted nutritional status and signs of metabolic stress. The results from the mesocosm setting reinforce these results. Lizards prospered relatively well in all enclosures, treated or not with pesticides, presenting a broad range of natural behaviors. The laboratory approach confirmed P. bocagei as valuable indicator of sub-lethal exposure to environmental realistic doses of chlorpyrifos. According to our results, P. bocagei seems to be a suitable bioindicator of pesticide exposure.
McBrayer, Lance D. « Comparative Studies in the Functional Morphology of Lizard Feeding : Kinematics, Behavior, and Biomechanics ». Ohio : Ohio University, 2002. http://www.ohiolink.edu/etd/view.cgi?ohiou1037131997.
Texte intégralEdwards, Shelley. « Patterns and processes of adaptation in Lacertid lizards to environments in southern Africa ». Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85641.
Texte intégralENGLISH ABSTRACT: The phenotype of an individual has often been used as the descriminating factor in distinguishing species. However, with the advent of more precise molecular techniques, the genotype of species is increasingly being used as the preferred method in taxonomic classifications. Many taxa have recently been demonstrated to be incongruent in terms of their genetic and morphological groupings, and this may due to the influence that the environment may have on the morphological and functional aspects of a species. Selective pressures often act upon the performance of a species within a particular habitat first, and then selection for the morphological characters that allow for optimal performance occurs. Should genetically disparate species inhabit a particular environment, convergence in morphologies and performance may evolve. Historically, lizard species descriptions were based primarily on external morphologies, and thus misclassfication of species may have occurred due to mistakenly grouping species with convergent morphologies together. In the current dissertation, the links between morphology, performance capacities, diet and behaviour is explored in comparison to the environment and genetic relationships of southern African lacertid lizards. The performance capacities and associated morphological traits were expected to be more closely linked with the environment, and not closely linked with genetic relationships. To investigate these expectations, a multidisciplinary approach was taken, and genetic, morphological and performance analyses were done and compared with dietary behavioural and environmental analyses. In the first chapter, the link between habitat openness and the lizard bauplans is investigated and the presence of convergent morphologies within this group of lizards is uncovered. These convergences are shown to have resulted in misclassification of two lacertid species, and taxonomic revisions within the family are discussed. The second chapter explores the link between performance and associated morphological traits, and the dietary composition of the members of the Nucras genus. The third chapter identifies the link between the predator escape strategies employed by the members of the Meroles genus, and their morphologies and performance capacities. The fourth chapter explores the intraspecific, inter-population differences in morphologies and investigates the link between the morphological groupings and the population genetic groupings within Pedioplanis lineoocellata. The final chapter identifies whether adaptation to a novel habitat can occur over a relatively short period of time, and the morphological traits, functional aspects, and population genetic structure is investigated in conjunction with environmental analyses of vegetation and substrate between the populations of Meroles knoxii. It was concluded that the morphological and functional aspects of the southern African lacertid lizards are more closely related to the environment, particularly the microhabitat structure, than to their genetic relationships, and that future work using this group of lizards should involve a multidisplinary approach as different selective pressures are playing a role in shaping the morphologies and performance capacities of these lizards, compared to those that are acting upon the genotypes of the lizards.
AFRIKAANSE OPSOMMING: Die fenotipe van 'n individu is dikwels gebruik as die diskriminerende faktor in kenmerkende spesies. Maar, met die ontwikkeling van meer akkurate molekulêre tegnieke, word die genotipe van spesies toenemend gebruik as die voorkeur-metode in taksonomiese klassifikasie. Die onversoenbaarheid van genetiese en morfologiese eienskappe kom voor in ‘n verskeidenheid taksa, dit kan wees as gevolg van die invloed wat die omgewing het op die morfologiese en funksionele aspekte van ‘n spesie. Selektiewe druk beїnvloed dikwels doeltreffende funktionaliteit van 'n spesie in 'n bepaalde habitat eerste, en gevolglik word morfologiese karakters wat voorsiening maak vir optimale funktionaliteit geselekteer. Indien geneties uiteenlopende spesies woon in 'n bepaalde omgewing, kan konvergensie in morfologie en soortgelyke werksverrigtinge ontwikkel. Histories, is akkedis spesiesbeskrywings hoofsaaklik gebaseer op eksterne morfologieë, en kan dus misklassifikasie tot gevolg hê wat kan lei tot foutiewe taksonomie van spesies met konvergente morfologieë. In die huidige verhandeling, is die verband tussen die morfologie, werksverrigtingsvermoë, dieët en gedrag ondersoek, in vergelyking met die omgewing en die genetiese verwantskappe van Suider-Afrikaanse sandakkedisse. Die werksverrigtingsvermoë en gepaardgaande morfologiese eienskappe word verwag om te meer verband te hou met die omgewing, en dus nie in noue verband te wees met die genetiese verwantskappe nie. Om hierdie verwagtinge te ondersoek, is 'n multi-dissiplinêre benadering geneem, en genetiese, morfologiese en werksverrigtingontledings is gedoen in vergelyking met dieët, gedrags-en omgewings-ontleding. In die eerste hoofstuk, is die skakel tussen die habitat openheid en die akkedis bauplans ondersoek en die teenwoordigheid van konvergente morfologieë binne hierdie groep akkedisse word ten toon gestel. Hierdie konvergensies het gelei tot foutiewe klassifikasie van twee sandspesies, en taksonomiese hersiening binne die gesin word bespreek. Die tweede hoofstuk ondersoek die verband tussen werksverrigting en gepaardgaande morfologiese eienskappe, en die samestelling van die dieët van die lede van die Nucras genus. Die derde hoofstuk identifiseer die verband tussen die roofdier ontsnapping strategieë, morfologieë en werksverrigtingsvermoë van die Meroles genus. Die vierde hoofstuk ondersoek die intraspesifieke, inter-bevolkingsverskille in morfologieë en ondersoek die verband tussen die morfologiese groepe en die bevolking genetiese groepe binne die Pedioplanis lineoocellata spesies kompleks. Die finale hoofstuk identifiseer hoe die aanpassings na 'n nuwe habitat kan plaasvind oor 'n relatief kort tydperk, en die morfologiese eienskappe, funksionele aspekte en die bevolking genetiese struktuur word ondersoek in vergelyking met die omgewingsanalise van plantegroei en substraat tussen die bevolkings van Meroles knoxii. Die gevolgtrekking is dat die morfologiese en funksionele aspekte van die Suider- Afrikaanse sandakkedisse nader verwant is aan die omgewing, veral die mikrohabitat struktuur, as aan hul genetiese verwantskappe. Toekomstige werk op hierdie groep akkedisse moet ‘n multidisiplinêre benadering behels siende dat verskillende selektiewe drukke 'n rol speel in die vorming van die morfologie en werksverrigtingsvermoë van hierdie akkedisse, in vergelyking met selektiewe drukke wat die genotipes van die akkedisse beinvloed.
Shuttleworth, Cindy. « Ecological relationships between the armadillo lizard, Cordylus cataphractus, and the southern harvester termite, Microhodotermes viator ». Thesis, Link to the online version, 2006. http://hdl.handle.net/10019/1205.
Texte intégralStuart, Yoel Eli. « Character displacement and community assembly in Anolis lizards ». Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:10765.
Texte intégralKelso, Erin Christine. « The evolution of social displays in Sceloporus lizards ». [Bloomington, Ind.] : Indiana University, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3243786.
Texte intégralTitle from PDF t.p. (viewed Nov. 18, 2008). Source: Dissertation Abstracts International, Volume: 67-12, Section: B, page: 6942. Adviser: Emilia P. Martins.
Brown, Richard P. « Microevolution and ecophysiology of Canary Island skinks (Chalcides) ». Thesis, University of Aberdeen, 1990. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU031703.
Texte intégralPoe, Stephen Joseph. « Phylogeny of anoles / ». Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p3004359.
Texte intégralDu, Toit Dahne A. (Dahne Anne). « Geographical variation in the number of generation glands in cordylid lizards ». Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49975.
Texte intégralENGLISH ABSTRACT: Geographic variation in the presence/absence of generation glands in females of the cordylus-niger-oelofseni complex was described and correlated with climatic variables. Preserved and live specimens from 96 localities in the area south of 32°30' S and west of 19°45' E in the Western Cape, South Africa, were examined for the presence or absence of generation glands. Females from western coastal localities and from the Cape Fold Mountains generally lack generation glands, while females from inland lowland localities generally possess glands. A GIS analysis was performed to determine mean annual minimum temperature, mean annual maximum temperature, potential evaporation, mean annual precipitation, mean annual fog and mean annual cloud cover measured at 14:00 for each locality. Discriminant function and canonical analyses showed a highly significant correlation between the presence and absence of generation glands and five of the six climatic variables. It is suggested that the high incidence of fog and lower temperatures experienced along the west coast as a result of the cold Benguela Current, and the high incidence of orographic fog and cloud cover in the Cape Fold Mountains may affect energy allocation in females. In order to maintain their reproductive output, females may be forced to invest less energy in secondary sexual characters such as generation glands. Interspecific variation in the location, occurrence, number, and age of gland differentiation was investigated for cordylid lizards. For several species, data were obtained from the literature and for others data were obtained from material housed in the Ellerman Collection of the University of Stellenbosch. Cordylus cordylus and C. cataphractus were used for an evaluation of inter- and intrapopulation variation. Data for C. cordylus were obtained from five populations on the coastal lowlands of the Western Cape, while data on C. cataphractus come from the literature. The sex, snout-vent length, and number of generation glands were recorded for a representative sample of lizards at each locality. While in all species generation glands were located in the femoral region, Cordylus giganteus and C. microlepidotus had additional generation glands elsewhere on the body. It is suggested that additional generation glands in these species may be related to an increased need for chemical communication in a low-visibility environment in the case of C. giganteus, and in low population densities in the case of C. microlepidotus. Generation glands are present in all cordylid males, but females of some species may lack these glands. All cordylids display sexual dimorphism with regards to the presence and number of generation glands, with males having significantly more glands than females, indicating that these glands may play a more important role in males than in females. Low sexual dimorphism in at least two species suggests that generation glands may be equally important in both sexes of these species. In females, the presence of generation glands is closely regulated by climate. There is no indication of differences in generation gland profile between ground-dwelling and rock-dwelling species, except that in at least three ground-dwelling species, generation glands are already present at birth. In other species these glands differentiate only later in life. In the males of most species, generation glands start to differentiate prior to or at sexual maturity with a drastic increase in number when asymptotic body size is reached. The considerable inter- and intrapopulation variation in gland number in females, but not in males, underscores the hypothesis that the presence of generation glands in females is energy-linked and closely regulated by climate. An opposite geographic pattern of generation gland number in C. cataphractus, suggests that other factors than climate must be responsible for a difference in gland number and a difference in population density is suggested as explanation. To test for differences in aggression levels, females with and those without generation glands were staged in two experiments. In one experiment, females from different localities were staged against each other, while females from the same locality were paired in another experiment. No significant difference in aggression levels between females with and those without generation glands were observed in both experiments. It is suggested that generation glands do not exclusively function in territorial marking, but rather as a scent enhancer for femoral gland secretions. Inorder to elucidate the functional significance of generation glands, male response to female gland stimuli was investigated for 12 male C. cordylus. Males were presented with different female gland secretions (femoral, generation, and femoral and generation gland secretion combined) and water was used as a control. Total number of tongue-flicks and number of tongue-flicks directed at the secretion were counted. No significant difference was observed in the number of tongue-flicks between the different treatment groups. Males did, however, display leg-waving and head-rubbing behaviour. At present, the behaviour displayed by male C. cordylus in the presence of female gland stimuli, is unclear. The general absence of tongue-flicking of sandpaper labelled by female gland stimuli may be because of a flaw in the experimental design or because the experiment was conducted outside the breeding season. The display ofleg-waving and head-rubbing behaviour, however, suggests that cordylids do not exclusively rely on tongue-flicking for detection of conspecifics. The real function of generation glands thus still remains unresolved and further studies are needed to clarify this.
AFRIKAANSE OPSOMMING: Geografiese variasie in die aan-/afwesigheid van generasiekliere in wyfies van die cordylus-niger-oelofseni kompleks is beskryf en met klimaatsveranderlikes gekorreleer. Gepreserveerde en lewende materiaal, afkomstig van 96 lokaliteite in die area suid van 32°30' S en wes van 19°45'0 in die Wes-Kaap, Suid-Afrika, is vir die aan- ofafwesigheid van generasiekliere ondersoek. Generasiekliere is oor die algemeen afwesig in wyfies van westelike kuslokaliteite en die Kaapse Plooiberge, terwyl dit aanwesig is in wyfies van die binnelandse laagland lokaliteite. 'n GIS-analise is gedoen om die gemiddelde jaarlikse minimum temperatuur, gemiddelde jaarlikse maksimum temperatuur, potensiële verdamping, gemiddelde jaarlikse neerslag, gemiddelde jaarlikse mis en gemiddelde jaarlikse wolkbedekking, gemeet teen 14:00, vir elke lokaliteit te bepaal. Diskriminantefunksie en kanonieke analises toon 'n hoogs beduidende korrelasie tussen die aan- en afwesigheid van kliere en vyf van die ses klimaatsveranderlikes. Daar word voorgestel dat die hoë voorkoms van mis en lae temperature wat langs die weskus ervaar word as gevolg van die koue Benguela Seestroom, en die hoë voorkoms van orografiese mis en wolkbedekking in die Kaapse Plooiberge, die energie-toekenning in wyfies beïnvloed. Om hulle voortplantingsuitset te handhaaf, word wyfies moontlik gedwing om minder energie in sekondêre geslagskenmerke, soos generasiekliere, te belê. Interspesifieke variasie in die posisie, voorkoms, aantal en tyd van klierontwikkeling is vir verskeie gordelakkedisspesies ondersoek. Data vir verskeie spesies is vanuit die literatuur verkry, terwyl data vir ander spesies vanafmaterial in die Ellerman-versameling van die Universiteit van Stellenbosch verkry is. Cordylus cordylus en C. cataphractus is vir 'n evaluering van inter- en intrapopulasie variasie gebruik. Data vir C. cordylus is vanafvyfpopulasie wat op die kuslaaglande van die Wes-Kaap voorkom, ingesamel, terwyl data oor C. cataphractus vanuit die literatuur verkry is. Geslag, snoet-kloaak-lengte en die aantal generasiekliere is aangeteken vir 'n verteenwoordigende aantal individue van elke populasie. Terwyl generasiekliere in die femorale wyk van alle spesies aangetref word, het Cordylus giganteus en C. microlepidotus ook addisionele generasiekliere in ander dele van die liggaam. Daar is tot die gevolgtrekking gekom dat addisionele generasiekliere in hierdie spesies moontlik verwant is aan 'n groter behoefte aan chemiese kommunikasie in 'n lae sigbaarheidsomgewing in die geval van C. giganteus, en in 'n lae populasiedigtheid in die geval van C. microlepidotus. Generasiekliere word in alle gordelakkedis mannetjies aangetref, maar kan afwesig wees in wyfies van sommige spesies. Alle gordelakkedisse toon geslagsdimorfisme met betrekking tot die aanwesigheid en aantal generasiekliere, en mannetjies het beduidend meer kliere as wyfies, wat daarop dui dat hierdie kliere moontlik 'n meer belangrike rol by mannetjies as by wyfies speel. Lae geslagsdimorfisme inten minste twee spesies stel voor dat generasiekliere moontlik ewe belangrik in beide geslagte van hierdie spesies kan wees. In wyfies word die aanwesigheid van generasiekliere sterk deur klimaat gereguleer. Daar is geen aanduiding van verskille in generasieklierprofiel tussen grondbewonende en rotsbewonende spesies nie, behalwe dat generasiekliere reeds by geboorte teenwoordig is in ten minste drie grondbewonende spesies. In ander spesies ontwikkel hierdie kliere eers later. In mannetjies van die meeste spesies, begin generasiekliere voor oftydens geslagsrypheid ontwikkel, met 'n drastiese toename in aantal kliere wanneer asimptotiese liggaamsgrootte bereik word. Die aansienlike inter- en intrapopulasie variasie in aantal kliere in wyfies, maar nie in mannetjies nie, ondersteun die hipotese dat die teenwoordigheid van generasiekliere in wyfies aan energie gekoppel is en deur klimaat gereguleer word. 'n Teenoorgestelde geografiese patroon in die aantal generasiekliere in C. cataphractus, stel voor dat ander faktore as klimaat vir die verskil in aantal kliere verantwoordelik is en 'n verskil in populasiedigtheid word as verklaring voorgestel. Om vir verskille in aggressievlakke te toets, is wyfies met en wyfies sonder generasiekliere is teenoor mekaar getoets in twee eksperimente. In een eksperiment is wyfies van verskillende lokaliteite teenoor mekaar getoets, en in 'n ander eksperiment is wyfies van dieselfde lokaliteit teenoor mekaar getoets. Inbeide eksperimente is geen beduidende verskille is in die aggressievlakke van wyfies nie waargeneem nie. Daar word voorgestel dat generasiekliere nie uitsluitlik in gebiedsafbakening funksioneer nie, maar dat dit eerder as reukversterker vir die femorale kliere dien. Om die funksie van generasiekliere vas te stel, is die reaksie van 12 mannetjie C. cordylus op klierstimuli van wyfies getoets. Verskillende kliersekresies (femoraal, generasie, en femoraal en generasie gekombineerd) van wyfies is mannetjies voorgelê, en water is as 'n kontrole gebruik. Totale aantal tongskiete en aantal tongskiete wat na die sekresie gerig is, is getel. Geen beduidende verskil in die aantal tongskiete is tussen die verskillende groepe waargeneem nie. Mannetjies het egter beenwaai- en kopvryfgedrag getoon. Die rede vir die gedrag wat deur C. cordylus mannetjies in die teenwoordigheid van klierstimuli van wyfies vertoon word, is egter tans onduidelik. Die algemene afwesigheid van tongskiete na skuurpapier wat met klierstimuli van wyfies gemerk is, mag moontlik wees as gevolg van 'n fout in die eksperimentele ontwerp of omdat die eksperiment buite die paarseisoen uitgevoer is. Die vertoning van beenwaai- en kopvryfgedrag stel egter voor dat gordelakkedisse nie uitsluitlik op tongskiete staatmaak om lede van dieselfde spesie waar te neem nie. Die ware funksie van generasiekliere is dus steeds onopgelos en verdere studies word benodig om dit duidelikheid hieroor te kry.
Bolet, Mercadal Arnau. « The evolutionary history of lizards on the Iberian Peninsula ». Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/131276.
Texte intégralThe remarkable squamate fossil record from the Iberian Peninsula represents an invaluable opportunity to unveil the evolutionary history of lizards and amphisbaenians during a long time span (Jurassic-Quaternary) in a key area of intermittent contact between Europe and Africa. Only Mesozoic (mainly Late Jurassic and Early Cretaceous) and Quaternary lizard assemblages had been systematically described previously. The description of new material from the Early Cretaceous improves our knowledge of the exceptional Mesozoic assemblages through the erection of Pedrerasaurus latifrontalis from La Pedrera de Meià and Jucaraseps grandipes from Las Hoyas, as well as the description of the second known specimen of Scandensia ciervensis. The diverse assemblage from Sossís (late Eocene) represents the first late Eocene lizard assemblage from Southern Europe, and includes the highly characteristic new taxon Pyrenasaurus evansae, as well as specimens that increase geographical and/or temporal ranges of several groups in the Iberian Peninsula, such as pleurodont iguanians, gekkotans, lacertids, scincids, cordyliformes, glytposaurines, anguines and amphisbaenians. The assemblage of Sossís provides insights from paleobiogeographical and paleoecological viewpoints, and compares well with contemporaneous French localities, supporting previous hypotheses based on mammals. In the Miocene, the diversity of varanines is reduced to the genus Varanus through the synonymization of Iberovaranus with the former. A new species of Blanus, based on the first amphisbaenian skull from the European fossil record, is described. Both studies contribute to an ongoing refinement of a rather incomplete knowledge on Miocene squamate faunas resulting from a superficial treatment received by many preceding works. Previous knowledge of fossil Iberian lizards and amphisbaenians is reviewed in the light of these new findings, and placed in a modern framework, shedding light on issues such as the composition of the assembages, paleobiogeography and paleoenvironment. The result is one of the most complete visions of their evolution most of its time of existence in a given area, in this case, the Iberian Peninsula.
Paterson, James. « Drivers of Density in Ornate Tree Lizards (Urosaurus ornatus) ». Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36892.
Texte intégralTull, John Christopher. « Lizards as a model system for investigating environmental change ». abstract and full text PDF (free order & ; download UNR users only), 2006. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3221882.
Texte intégralMcClelland, M. H. « The thermal physiology and energetics of European Lacertid lizards ». Thesis, University of Nottingham, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332160.
Texte intégralFredericksen, Nell Jefferson. « The energetic consequences of tail loss to juvenile lizards ». Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44635.
Texte intégrall evaluated the hypothesis that juveniles of species whose tail is important for predator deflection should allocate energy preferentially to tail growth at the expense of body growth. Relative linear tail growth (linear tail growth/linear body growth) and relative mass tail growth (tail mass growth/body mass growth) were measured for juveniles of two species of skinks: Eumeces Fasciatus that use the tail for predator deflection, and Chalcides ocellatus that does not use the tail for predator deflection. Experimental conditions produced an energy limiting situation under which the priority of energy allocation to tail regeneration should be exhibited. For E. fasciatus, relative linear tail growth was higher for the energy limited than control group and for the tail-removal than the tailed lizards. For C. ocellatus, relative linear tail growth was not affected by energy level but was lower for tail-removal than tailed lizards. For both species, relative tail mass growth was lower for the tail-removal than tailed lizards. The greater relative linear tail growth of regenerating than normal tails of E. fasciatus supports the hypothesis that rapid tail regeneration is important for a species whose tail is used for predator deflection. However, the low rate of tail regenerartion in mass suggests that mass gains in the regeneration process. In contrast, lower relative linear and mass tail growth of C. ocellatus that were regenerating tails suggests that tail regeneration has a low priority for this species.
Master of Science
McGregor, Duncan. « Mitochondrial DNA evolution in Canary Island lizards (genus : Gallotia) ». Thesis, University of Aberdeen, 1992. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU049105.
Texte intégralSadlier, Ross Allen. « Systematic Studies on the Scincid Lizards of New Caledonia ». Thesis, Griffith University, 2010. http://hdl.handle.net/10072/366402.
Texte intégralThesis (PhD Doctorate)
Doctor of Philosophy by Publication (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text
Rej, Julie. « Late Quaternary Dragon Lizards (Agamidae : Squamata) from Western Australia ». Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etd/3210.
Texte intégralFreeman, A. B. « An ecological study of the lizard fauna of Kaitorete Spit, Canterbury ». Master's thesis, Lincoln University. Bio-Protection and Ecology Division, 1994. http://theses.lincoln.ac.nz/public/adt-NZLIU20080205.115012/.
Texte intégralPowers, Sean D. Anderson Roger A. « How does spatial variation in climate cause spatiotemporal patterns in lizard energetics ? / ». Online version, 2010. http://content.wwu.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=346&CISOBOX=1&REC=7.
Texte intégralWilson, Byron Sanders. « Latitudinal variation in the ecology of a lizard : seasonal differences in mortality and physiology / ». Thesis, Connect to this title online ; UW restricted, 1990. http://hdl.handle.net/1773/5213.
Texte intégralLymburner, Alannah. « Differences in Thermal Quality Affect Investment in Thermoregulation by Lizards ». Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39115.
Texte intégralDay, Elaine Baird. « Medial and dorsal cortex function and foraging strategy in lizards / ». Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
Texte intégralStuart-Fox, Devi M. « Evolution of colour variation and species richness in agamid lizards / ». St. Lucia, Qld, 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16809.pdf.
Texte intégralAlmutairi, Mohammed Saeed. « Comparative phylogeography and species delimitation of the Arabian Peninsula lizards ». Thesis, Bangor University, 2014. https://research.bangor.ac.uk/portal/en/theses/comparative-phylogeography-and-species-delimitation-of-the-arabian-peninsula-lizards(30b1fccd-7822-4fe5-af74-a5d1f7ddced1).html.
Texte intégralAl-Doky, Othman A. I. « The structure, function and development of the Granulosa layer in lizards with special reference to Scincus mitranus (Anderson) ». Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276338.
Texte intégralRuddock, Lanral. « Social structure of the lizard, Cordylus giganteus ». Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51909.
Texte intégralENGLISH ABSTRACT: Cordylus giganteus is the largest lizard species of the family Cordylidae and is restricted in distribution to the highveld grasslands of the Free State, South Africa. Previous work on life history and physiological ecology suggested the need for further investigation into the social structure of C. giganteus, with the aim of improving knowledge on South African herpetofauna and contributing towards better conservation plans. Observations, recaptures, behavioural experiments and chemical analyses were made to investigate chemical communication, movements around and between burrows, spatial distribution and response to intruders. Sexual variation was found in both femoral gland proteins and lipids, while seasonal variation was found in lipids. Femoral gland proteins do not vary intra-individually. These results suggest alternate roles in communication for femoral gland proteins and lipids. Female C. giganteus showed a possible discriminatory ability between their own femoral gland secretion and that of other individuals. Burrow movements were characterised by very little time spent between burrows, high burrow fidelity and limited dispersal during seasons, other than movements associated with mating activity. Lizards remained in very close proximity to burrows. Male and female burrows were distributed in a clumped fashion, while male burrows were distributed randomly and female burrows were distributed randomly with respect to one another. There was a high degree of spatial association of male and female burrows. Male and female resident lizards responded aggressively to experimentally introduced conspecifics of the same sex, but exhibited no differential response towards neighbours or non-neighbours. Males and females exhibited similar levels of aggression towards intruders. The social system of C. giganteus can be defined as site defence, with very low frequencies of agonistic interactions. The social system of C. giganteus seems to be well suited to other aspects of its life history.
AFRIKAANSE OPSOMMING: Cordylus giganteus is die grootste akkedis spesie van die familie Cordylidae en is beperk in verspreiding tot die hoeveld graslande van die Vrystaat, Suid Afrika. Vorige werk oor die lewensgeskiedenis en fisiologiese ekologie het aangedui dat verdere inligting oor die sosiale struktuur van C. giganteus nodig is, met die doelom kennis oor Suid-Afrikaanse herpetofauna te verbeter, en om beter bewaringsstrategieë daar te stel. Observasies, hervangs, gedragseksperimente en chemise analyses was uitgevoer om aspekte oor kommunikasie, bewegings tussen en om gate, gat verspreiding en reaksie teenoor indringer akkedisse, te bestudeer. Femorale klier afskeidings het seksuele variasie in beide die proteiene en die lipiede getoon, terwyl net die lipide seisoenale variasie getoon het. Femoral klier proteiene het nie seisoenale variasie binne individue getoon nie. Hierdie resultate dui op alternatiewe funksies vir die femoral klier proteiene en lipiede. Wyfie C. giganteus het moontlik tussen hule eie femoral klier sekreet en die van ander wyfies onderskei. Baie min tyd tussen gate, hoë lojaliteit teenoor gate en beperkte bewegings weg van gate het gat bewegings gekarakteriseer. Net gedurende die paarseisoen was daar meer bewegings tussen gate. Andersins, het akkedisse baie naby hul eie gate gebly. Mannetjie en wyfie gate was naby mekaar versprei, terwyl mannetjies ewekansig teenoor mekaar versprei was, en wyfies ewekansig teenoor mekaar versprei was. Die verspreiding van mannetjies en wyfies het baie van die verspreiding van die ander geslag afgehang, sodat daar 'n groot assosiasie tussen hulle was. Akkedisse wat gate bewoon het, was baie aggressief teenoor indringer akkedisse, maar het geen verskil in reaksie teenoor naburige akkedisse of nie-naburige akkedisse getoon nie. Mannetjies en wyfies het dieselfde aggressiwiteit teenoor indringers getoon. Die sosiale struktuur van C. giganteus kan geklassifiseer word as skuilings-beskerming, maar met baie lae frekwensies van sosiale interaksies. Dit blyk dat die sosiale struktuur van C. giganteus baie goed pas by ander aspekte van sy lewensstyl.
Visagie, Louise. « Grouping behaviour in the armadillo girdled lizard, Cordylus cataphractus ». Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52290.
Texte intégralENGLISH ABSTRACT: Cordy/ us cataphractus and C macropholis naturally occur in groups on a year round basis. I examined whether limited shelter availability might be responsible for this phenomenon. Individuals were provided with an excess of shelter sites and the observed pattern of shelter occupation was contrasted to that obtained for the solitary living species C polyzonus. Cordy/us cataphractus consistently occupied fewer shelters than its two congeners. Results suggest that grouping behaviour in this species is not the result of a limitation in refuge sites. In contrast, the pattern of shelter occupation by C macropholis did not differ significantly from that of C polyzonus, thus the aggregative behaviour observed in the former species may partially be attributed to limited shelter availability in its natural habitat. Conspecific recognition by means of pheromonal detection has been reported in many lizard families, but only for one member of Cordylidae, namely Cordy/us cordy/us. Cordylus cataphractus individuals were exposed to ceramic tiles that had been labeled by conspecific male and female substrate deposits. Labeling was achieved by using ceramic tiles as the bottom half of a shelter in a lizard's home cage for ten consecutive days. Washed tiles were used as controls. Labeled tiles did not elicit significantly more tongue-flicks than control tiles from test specimens in a series of trials. The apparent lack of conspecific recognition via pheromonal detection might be attributable to the group-living nature of this species, which primarily use visual cues for identification purposes. Tongue-flicking is generally utilized in C cataphractus in the detection of novel stimuli. Spatial dynamics of the group-living cordylid, C cataphractus, were investigated by studying patterns of intergroup movement. To date, literature has assumed that C cataphractus groups represent family units, implying low or delayed dispersal rates and high group fidelity. A mark-recapture experiment on six groups included three recaptures outside of and three recaptures within the mating season. High percentages of male, female and juvenile lizards left their groups, but might be an artifact of microhabitat disturbance. High proportions of males, females and juveniles entering the groups, both outside of mld within the mating season, clearly implied a high rate of intergroup movement. Activity and foraging patterns were studied in group-living C. cataphractus lizards by conducting direct field observations between September 1998 and October 1999. The influence of general weather patterns as well as the effect of group size on these patterns were investigated by observing a small-sized, medium-sized and large group. Each group was observed for a minimum of three sunny days per season, with scans conducted every 30 minutes between the hours of 08:00 and 20:00. There was a high rate of activity during the mating season in spring (September). Activity declined sharply mld foraging ceased at the onset of warm, dry conditions (February). Virtually no activity occurred just prior to the first winter rains (July), after which the lizards emerged to forage and replenish energy stores before onset of the next mating season. Selective inactivity might be employed to reduce energy expenditure in this group-living lizard, where intraspecific competition is stringent. Groups of different sizes display different thresholds at which it becomes energetically viable for group members to emerge, as well as different patterns of spatial use around their respective home crevices. Members of larger groups perched further from their crevices, ran further to catch prey mld had less potential prey capture events per individual. Lizards in the larger groups also displayed sporadic lengthy foraging excursions. Such movements might explain the evolution of tail-biting behaviour and heavy armour, which are defensive strategies associated with open areas.
AFRIKAANSE OPSOMMING: Cordylus cataphractus en C. macropholis word dwarsdeur die jaar in groepe in hul natuurlike habitat aangetref. Daar is nagevors of 'n beperking in aantal beskikbare skuilplekke vir hierdie verskynsel verantwoordelik is. Individue is van 'n oormaat skuilings voorsien en die waargenome patroon van skuilplekbesetting is gekontrasteer met dié verkry vir '11 enkelwonende species, naamlik C. polyzonus. Cordylus cataphractus het voortdurend minder skuilplekke beset as sy kongeneriese species. Groepsgedrag in C. cataphractus is dus nie die resultaat van 'n tekort aan beskikbare skuilplekke nie. In teenstelling hiermee het die patroon van skuilplekbesetting vertoon deur C. macropholis nie noemenswaardig verskil van dié van C polyzonus nie. Dus mag die groepsgedrag wat gewoonlik in C. macropholis waargeneem word 'n uitvloeisel wees van 'n beperking op die beskikbaarheid van skuilplekke in sy natuurlike habitat. Herkenning van speciesgenote deur waarneming van ferornone is vir verskeie akkedisfamilies gerapporteer, maar slegs vir een lid van Cordylidae, naamlik C. cordylus. Cordylus cataphractus individue is blootgestel aan keramiekteëls wat gemerk is met substraat-neerleggings van manlike en vroulike speciesgenote. Sodanige merking is uitgevoer deur die keramiekteëls vir tien dae lank te gebruik as die onderste helfte van akkedisse se skuilplekke in hul tuishokke. Gewaste teëls is as kontroles gebruile Gemerkte teëls het nie statisties beduidend meer tongskiete van die akkedisse uitgelok as kontrole teëls in 'n reeks toetse nie. Die klaarblyklike afwesigheid van speciesgenootherkenning deur middel van feromoon waameming kan moontlik toegeskryf word aan die groeplewende gedrag van C. cataphractus, wat primêr visuele informasie vir identifikasie gebruik. Cordylus cataphractus gebruik tongskiete oor die algemeen vir die waarneming vannuwe omgewingsstimuli. Die ruimtelike dinamika van 'n groeplewende gordelakkedis, C. cataphractus, is ondersoek deur die patroon van intergroepbeweging na te vors en groepsgetrouheid te meet. Tot op datum is daar in die literatuur aanvaar dat C cataphractus groepe familie-eenhede verteenwoordig, wat lae of vertraagde verpreidingstempo' sasook' n hoë mate van groepsgetrouheid impliseer. 'n Merk-hervang eksperiment is op ses groepe uitgevoer, insluitend drie hervang episodes buite en drie binne die paarseisoen. 'n Hoë persentasie manlike, vroulike en onvolwasse akkedisse het hul groepe verlaat, maar dit mag bloot 'n uitvloeisel van versteuring van die mikrohabitat wees. 'n Hoë proporsie mannetjies, wyfies en onvolwassenes het egter by die groepe aangesluit, beide buite en binne die paarseisoen, wat onteenseglik op 'n hoë mate van intergroep beweging dui. Daar kom derhalwe veel vryer bewegingspatrone in hierdie species voor as voorheen vermoed en dit is hoogs onwaarskynlik dat groepe familie-eenhede verteenwoordig. Aktiwiteits- en voedingspatrone van die groeplewende akkedis, C cataphractus, is bestudeer in 'n reeks veldobservasies tussen September 1998 en Oktober 1999. Afgesien van die invloed van algemene weerspatrone. is die effek van groepgrootte op hierdie patrone ondersoek deur 'n klein, medium en groot groep te observeer. Elke groep is waargeneem oor . 'n minimum periode van drie dae per seisoen met opnames elke 30 minute, tussen 08:00 ten 20:00. 'n Hoë aktiwiteitsvlak is gedurende lente tydens die paarseisoen gehandhaaf (September). Met die aanvang van warm en droë kondisies (Februarie) het aktiwiteitsvlakke skerp begin daal en voedingsgedrag is gestaak. Feitlik geen aktiwiteit was waarneembaar kort voor die eerste winterreëns (Julie) nie, waamá akkedisse intensiefbegin voed het om energiestore op te bou voor die aanvang van paartyd. Selektiewe onaktiwiteit verminder moontlik energieverbruik in hierdie groeplewende akkedis, waar intraspesifieke kompetisie streng is. Verskillende groepgroottes beskik oor verskillende perke waar dit vir die individu energeties voordelig sou wees om uit die skeur te kom, asook 'n variasie in ruimtelike gebruik om die skeur. Individue van die twee groter groepe het nader aan hul rotsskeur gesit, het verder van die skeur af prooi vang en het beduidend minder potensiële voedingskanse gehad. Akkedisse in die groter groepe het voorts sporadiese lang voedingsekskursies getoon. Hierdie bewegings mag die evolusie van stertbytgedrag en 'n swaar pantser, verdedigingstrategieë wat met oop areas geassosieer word, verduidelik.
Heger, Nancy Ann. « The impact of size on thermal efficiency : size related costs and benefits in Varanus giganteus / ». Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.
Texte intégralWall, Michael. « The influence of foraging mode in snake evolution : lessons from a snake analogue, Burton's legless lizard (Lialis burtonis Gray, Pygopodidae) ». Thesis, The University of Sydney, 2005. https://hdl.handle.net/2123/28033.
Texte intégralWarner, Daniel Augustus. « The ecology and evolution of temperature-dependent sex determination in a short-lived lizard ». Thesis, The University of Sydney, 2007. https://hdl.handle.net/2123/28095.
Texte intégralFu, Jinzhong. « Phylogeny of lacertid lizards (Squamata : Lacertidae) and the evolution of unisexuality ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq41020.pdf.
Texte intégralBissell, Ahrash N. « Population differences and behavior of lizards : on the road to speciation ? / ». view abstract or download file of text, 2001. http://wwwlib.umi.com/cr/uoregon/fullcit?p3024506.
Texte intégralTypescript. Includes vita and abstract. Includes bibliographical references (leaves 121-147). Also available for download via the World Wide Web; free to University of Oregon users.
Itoh, Ryo. « Eavesdropping on heterospecific alarm calls as antipredatory tactics in Malagasy lizards ». 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/120693.
Texte intégralCosta, Marcia Virginia Gomes da. « Tradução comentada do conto Lizards in Jamshyd's Courtyard, de William Faulkner ». Florianópolis, SC, 2006. http://repositorio.ufsc.br/handle/123456789/103150.
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Este trabalho de dissertação é fruto de estudos de teorias da tradução e teve como princípio norteador a aquisição de conhecimentos sobre aspectos relacionados com a produção da obra original, para só então definir a posição do tradutor. Somente após a contextualização da obra original e análise das características do autor concretizou-se a tradução do conto Lizards in Jamshyd's Courtyard de William Faulkner. Para manter a força do conto original não houve simplesmente a preocupação em conseguir encontrar equivalentes ou traduzir palavra por palavra, mas sim, em adentrar no jogo de significantes, de maneira a tornar a tradução o mais próximo possível do original, respeitando a heterogeneidade das situações lingüísticas e culturais existentes entre a língua inglesa do original e a língua portuguesa no Brasil, para a qual o conto foi traduzido. Muitos obstáculos foram encontrados ao longo desse processo, e a estes, foram apresentadas soluções. Tanto as hipóteses levantadas para a solução dos problemas, quanto as decisões tomadas descritas nesta pesquisa estão ancoradas nos princípios teóricos de Lawrence Venutti, Georges Mounin, John C. Catford e Antoine Berman. This essay has its origins in studies about translation theories and in the knowledge acquisition about the aspects related with the production of the original work. Just after those studies, was established the position as translator. And only after the contextualization of the original work and the analysis of the author characteristics it was started the translation process of the tale Lizards in Jamshyd's Courtyard written by William Faulkner, this tale is part of the novel Hamlet written by the same author. To maintain the strength of the original tale there was not just a concern about getting equivalents or translating word by word , but was to be very close to the characteristics of the original tale; considering what is heterogeneous in the linguistic and cultural situations between the English language in which the original tale was written, and the Portuguese language from Brazil where the tale has been translated. The hypothesis, the possible solutions to the problems found, and the decisions taken in this research are based on: Lawrence Venutti, Georges Mounin, John C. Cattford and Antoine Berman's theories.
Stroud, James T. « Using Introduced Species of Anolis Lizards to Test Adaptive Radiation Theory ». FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3695.
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