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Letteratura scientifica selezionata sul tema "Hoplodactylus maculatus"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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Articoli di riviste sul tema "Hoplodactylus maculatus"

Girling, J. E., A. Cree e L. J. Guillette, Jr. "Oviducal structure in four species of gekkonid lizard differing in parity mode and eggshell structure". Reproduction, Fertility and Development 10, n. 2 (1998): 139. http://dx.doi.org/10.1071/r97056.

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Oviducal structure was analysed in vitellogenic females from four species of gekkonid lizard exhibiting variation in parity mode and eggshell structure: Hemidactylus turcicus (oviparous) which produces a hard, calcareous eggshell; Saltuarius wyberba (oviparous) which produces a soft, parchment-like eggshell; and Hoplodactylus maculatus and Hoplodactylus duvaucelii (both viviparous). Oviducts were analysed by light, scanning electron and transmission electron microscopy. The uterus exhibited differences among species that were directly attributable to parity mode. H. turcicus and S. wyberba (oviparous) had numerous uterine shell glands; H. maculatus and H. duvaucelii(viviparous) had very few. The uterus also exhibited differences between the two oviparous species (H. turcicusand S. wyberba) which may be related to the type of eggshell produced. Variations were noted in the staining properties of the uterine glandular and epithelial cells. The structure of the infundibulum, uterine tube, isthmus and vagina also differed among species, but differences could not be directly related to parity mode or eggshell structure. Instead, the differences may be related to how prepared the oviduct is for ovulation in individuals analysed from the different species. This study confirms, in the Gekkonidae, aspects of oviducal structure that have been associated with parity mode in other squamate taxa.

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Boyd, Mary M. M. "The Oviduct, Foetal Membranes, and Placentation in Hoplodactylus maculatus Gray." Proceedings of the Zoological Society of London A112, n. 3-4 (20 agosto 2009): 65–104. http://dx.doi.org/10.1111/j.1469-7998.1943.tb00073.x.

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Girling, J. E., A. Cree e L. J. Guillette, Jr. "Oviductal structure in a viviparous New Zealand gecko,Hoplodactylus maculatus". Journal of Morphology 234, n. 1 (ottobre 1997): 51–68. http://dx.doi.org/10.1002/(sici)1097-4687(199710)234:1<51::aid-jmor5>3.0.co;2-q.

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Cork, S. C., e P. H. G. Stockdale. "Mycotic disease in the common New Zealand gecko (Hoplodactylus maculatus)". New Zealand Veterinary Journal 40, n. 1 (marzo 1992): 37. http://dx.doi.org/10.1080/00480169.1992.36519.

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Cork, S. C., e P. H. G. Stockdale. "Mycotic disease in the common New Zealand gecko (Hoplodactylus maculatus)". New Zealand Veterinary Journal 42, n. 4 (8 gennaio 1994): 144–47. http://dx.doi.org/10.1080/00480169.1994.35805.

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Wong, Cheeho, Dianne Gleeson, Robyn Howitt, Manuela Barry, Dianne Brunton e Weihong Ji. "Polymorphic microsatellite loci and interspecific cross-amplification in the New Zealand endemic gecko species Hoplodactylus duvaucelii and Hoplodactylus maculatus". Conservation Genetics Resources 3, n. 2 (8 dicembre 2010): 331–33. http://dx.doi.org/10.1007/s12686-010-9356-5.

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Rock, Jennifer, e Alison Cree. "INTRASPECIFIC VARIATION IN THE EFFECT OF TEMPERATURE ON PREGNANCY IN THE VIVIPAROUS GECKO HOPLODACTYLUS MACULATUS". Herpetologica 59, n. 1 (marzo 2003): 8–22. http://dx.doi.org/10.1655/0018-0831(2003)059[0008:iviteo]2.0.co;2.

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Cree, Alison, e Louis J. Guillette. "Biennial Reproduction with a Fourteen-Month Pregnancy in the Gecko Hoplodactylus maculatus from Southern New Zealand". Journal of Herpetology 29, n. 2 (giugno 1995): 163. http://dx.doi.org/10.2307/1564553.

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Wotton, Debra M. "Effectiveness of the common gecko (Hoplodactylus maculatus) as a seed disperser on Mana Island, New Zealand". New Zealand Journal of Botany 40, n. 4 (dicembre 2002): 639–47. http://dx.doi.org/10.1080/0028825x.2002.9512820.

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Girling, J. E., e A. Cree. "Plasma Corticosterone Levels Are Not Significantly Related to Reproductive Stage in Female Common Geckons (Hoplodactylus maculatus)". General and Comparative Endocrinology 100, n. 3 (dicembre 1995): 273–81. http://dx.doi.org/10.1006/gcen.1995.1158.

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Più fonti

Tesi sul tema "Hoplodactylus maculatus"

Tocher, Mandy Darlene. "The New Zealand common gecko Hoplodactylus maculatus: an ecophysiological comparsion of two isolated populations". Thesis, University of Canterbury. Biological Sciences, 1992. http://hdl.handle.net/10092/1431.

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Thermophysiological traits of two isolated Hoplodactylus maculatus populations were investigated to test adpatations to climate. Geckos were collected from Craigieburn (high altitude, generally cooler site) and Banks Peninsula. If climatic conditions at respective sites influenced physiology, I expected geckos from Craigieburn to exhibit cold-adapted physiological traits, whilst Banks Peninsula geckos would exhibit traits more characteristic of a warmclimate species. To this end I investigated four thermophysiological parameters: metabolism (SMR), preferred body temperature (PBT), locomotory performance and critical thermal minimum (CTMin). I hypothesized that if climate had an effect on SMR, Craigieburn geckos would exhibit higher levels of SMR which typically characterise other coolclimate reptiles. Craigieburn geckos displayed an average relative elevation of SMR over Banks Peninsula geckos of 26%. Furthermore, Craigieburn geckos appeared to be 'geared' towards lower body temperatures and exhibited a greater acclimatory and acclimatizatory ability of SMR. The PBT of Craigieburn geckos was consistently elevated above Banks Peninsula geckos. This finding was somewhat paradoxical in light of previous studies of this parameter. A closer examination of the ecology of the two populations is required to clarify the adaptive significance of a higher PBT in geckos from a cooler climate. With respect to locomotory performance, I hypothesized that if thermal extremes influenced activity, Craigieburn geckos would exhibit activity patterns which help ameliorate the adverse effects of cold temperature. Craigieburn geckos did in fact have greater independence of activity to temperature than Banks Peninsula geckos, especially over lower body temperatures. The final parameter investigated, that of the critical thermal minimum, failed to distinguish the populations decisively. However there was some evidence of a greater acclimatizatory and acclimatory range in Craigieburn geckos, providing somewhat limited support for a population difference. Investigations into all four parameters lead me to conclude that populations of Hoplodactylus maculatus from Craigieburn and Banks Peninsula are physiologically distinct and warrant a revision of nomenclature.

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Bannock, Carol A. "Implications of past and future vegetation change for the lizard fauna of Motunau Island". Master's thesis, Lincoln University. Bio-Protection and Ecology Division, 1998. http://theses.lincoln.ac.nz/public/adt-NZLIU20080430.163408/.

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Abundance, distribution and habitat preferences of the lizard species present on Motunau Island, off the Canterbury coast of New Zealand, were investigated. The aim of the study was to investigate the extent to which recent vegetation change on Motunau Island has effected the lizard community and what implications this has for the future management of the Island. Three species of lizard occur on Motunau Island; the common gecko (Hoplodactylus maculatus), common skink (Oligosoma nigriplantare polychroma) and spotted skink (O. lineoocellatum). Rabbits (Oryctolagus cuniculus) were present on the island from 1862 until their eradication in 1962. Since then, vegetation on the island has changed from being tussock-dominated to being dominated by exotic weeds. Data from lizard pitfall trap surveys carried out in 1967-75 by Tony Whitaker of the Department of Scientific and Industrial Research (DSIR) were compared with new pitfall trapping data to determine if changes in the lizard population had occurred in response to these vegetation changes. The abundance of O. n. polychroma and H. maculatus does not appear to change significantly. The distribution of these two species were significantly correlated but neither showed any preference for a particular type. The abundance of O. lineoocellatum was significantly greater in 1996/97 than in the earlier DSlR surveys. This could be a result of the vegetation becoming more open and more structurally complex since the early surveys. This would offer greater opportunities for O. lineoocellatum (which is strongly heliothermic) to thermoregulate and forage. O. lineoocellatum showed no consistent significant preference towards any habitat type, although they tended to be found more in 'margin' habitat. Research into pitfall trapping and the way lizard behaviour may influence pitfall trapping data needs to be undertaken as there is a possible trap bias in this study. Management of Motunau Island needs to ensure that a structurally complex environment is maintained to ensure high numbers of all three lizard species can continue to coexist.

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Lettink, Marieke, e n/a. "Adding to nature : can artificial retreats be used to monitor and restore lizard populations?" University of Otago. Department of Zoology, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080715.091040.

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Artificial retreats are increasingly used to sample animal populations and in attempts to boost animal numbers in degraded habitats. Here, I test potential applications of artificial retreats for lizards inhabiting a coastal environment of high conservation value (Kaitorete Spit, New Zealand). I first conducted a pitfall-trapping survey examining the distribution and relative abundance of lizards in duneland, farmland and shrubland habitats, and tested the influence of trap placement on capture rates. Capture rates of the diurnal skinks Oligosoma maccanni (McCann�s skink) and O. nigriplantare polychroma (common skink) were highest in duneland and farmland, respectively, and were most sensitive to the distance separating traps from the nearest cover (the greater the distance, the lower the capture rate). Captures of O. lineoocellatum (spotted skink) and Hoplodactylus maculatus (common gecko) were rare. Secondly, in separate chapters I test the utility of artificial retreats for monitoring: 1) a preference trial examining relative use of three types of artificial retreats by skinks (O. maccanni and O. n. polychroma) and geckos (H. maculatus); 2) a comparison of the effectiveness of artificial retreats relative to pitfall traps for detecting cryptic and primarily nocturnal geckos (H. maculatus) following translocation; and 3) capture-recapture estimation of population parameters (survival and abundance) of H. maculatus. I found that: 1) geckos strongly preferred retreats made of Onduline over corrugated iron and concrete tiles, whereas skinks exhibited no apparent preferences; 2) artificial retreats were more effective than pitfall traps for detecting geckos following translocation; and 3) monthly survival and recapture probabilities of geckos varied with age-class and over time. Estimated survival was unexpectedly low, possibly due to excessive trap spacing. I developed a new capture-recapture model specifically for population size estimation with data from artificial retreats, which gave estimates that were up to 50% greater than those predicted by conventional capture-recapture models. I caution that permanent placement of artificial retreats in long-term studies may be inappropriate for estimation of population parameters due to potential habitat-enhancement effects and/or altered predation risk. Thirdly, I conducted a capture-recapture field experiment, using a replicated Before-After-Control-impact (BACI) design, to test the relative effects of habitat manipulation (artificial retreat addition) and partial predator removal (by fencing) on annual survival of duneland skink (O. maccanni) populations. Survival increased at sites with predator exclosures, but not at control sites or following the addition of artificial retreats, either alone or in combination with a predator exclosure. The magnitude of the increase in survival for the exclosure-only treatment was small, but sufficient to change the trajectory of an apparently stable population into an increasing one, suggesting that the population is limited by predators. Predator control, but not the addition of artificial retreats, is predicted to benefit O. maccanni. To conclude, the Onduline design developed here appears to be particularly useful for sampling cryptic, terrestrial geckos; however, artificial retreats must be used appropriately to avoid bias arising from habitat-enhancing effects and/or altered predation risk. The restoration value of artificial retreats requires further testing on other species and in areas where natural retreat sites are limited.

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Bannock, C. A. "Implications of past and future vegetation change for the lizard fauna of Motunau Island". Lincoln University, 1998. http://hdl.handle.net/10182/442.

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Fitness, Josephine. "Wellington geckos meet Wairarapa geckos : hybridisation between two genetically and morphologically distinct populations of the New Zealand common gecko complex (Hoplodactylus maculatus) : a thesis presented in partial fulfilment of the requirements for the degree of Masters of Science in Zoology at Massey University, Palmerston North, New Zealand". 2010. http://hdl.handle.net/10179/1656.

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The purpose of this study was to use molecular techniques and morphological measurements to set out to find whether a hybrid zone exists between two coastal populations of the common gecko (Hoplodactylus maculatus), on the Wellington south coast. I collected geckos from five sites in a coastal transect from the population of small geckos to the large geckos. Using four genetic loci, one mitochondrial (16S) and three nuclear (Rag-1, Rag-2, C-mos), I was able to determine that the coastal populations do have geneflow, however each population maintains some unique alleles. Morphological evidence reveals a significant difference in gecko sizes from Turakirae Head and those caught at Ocean Beach, separated by just 15 km. Adult geckos at Turakirae Head are on average 10mm smaller (snout-to-vent) than adult geckos at Ocean Beach, representing almost a doubling in average weight. The centre of the steep frequency clines of four characters is coincident and the widths are concordant. The narrower morphological clines indicate stronger selection on the size of the gecko, than on genetic loci.

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