| combining phylogeography with distribution modeling: multiple pleistocene range expansions in a parthenogenetic gecko from the australian arid zone. | phylogenetic and geographic evidence suggest that many parthenogenetic organisms have evolved recently and have spread rapidly. these patterns play a critical role in our understanding of the relative merits of sexual versus asexual reproductive modes, yet their interpretation is often hampered by a lack of detail. here we present a detailed phylogeographic study of a vertebrate parthenogen, the australian gecko heteronotia binoei, in combination with statistical and biophysical modeling of its ... | 2007 | 17712408 |
| phylogeography of sexual heteronotia binoei (gekkonidae) in the australian arid zone: climatic cycling and repetitive hybridization. | the biota of much of continental australia have evolved within the context of gradual aridification of the region over several million years, and more recently of climatic cycling between relatively dry and humid conditions. we performed a phylogeographical study of three sexual chromosome races of the heteronotia binoei complex of geckos found throughout the australian arid zone. two of these three races were involved in two separate hybridization events leading to parthenogenetic lineages (als ... | 2005 | 16029476 |
| lower fecundity in parthenogenetic geckos than sexual relatives in the australian arid zone. | theoretical models of the advantage of sexual reproduction typically assume that reproductive output is equal in sexual and parthenogenetic females. we tested this assumption by comparing fecundity between parthenogenetic and sexual races of gekkonid lizards in the heteronotia binoei complex, collected across a 1200 km latitudinal gradient through the australian arid zone. under laboratory conditions, parthenogenetic geckos had approximately 30% lower fecundity when compared with their sexual pr ... | 2005 | 15842490 |
| developmental success, stability, and plasticity in closely related parthenogenetic and sexual lizards (heteronotia, gekkonidae). | the developmental trajectory of an organism is influenced by the interaction between its genes and the environment in which it develops. for example, the phenotypic traits of a hatchling reptile can be influenced by the organism's genotype, by incubation temperature, and by genetically coded norms of reaction for thermally labile traits. the evolution of parthenogenesis provides a unique opportunity to explore such effects: a hybrid origin of this trait in vertebrates modifies important aspects ... | 2004 | 15341158 |
| the endogenous development of four new species of isospora schneider, 1881 (apicomplexa: eimeriidae) from australian geckos. | four new species of isospora are described from australian geckoes. isospora gehyrae n. sp. from gehyra cf. variegata in south australia have 18.5-22.5 x 17.5-20.0 microm oöcysts with 10.0-12.5 x 7.5-9.0 microm sporocysts; endogenous stages develop in the host cell cytoplasm. of the two species found in heteronotia binoei from northern queensland, isospora cytoheteronotis n. sp., with oöcysts of 20.0-26.0 x 17.5-25.0 microm and sporocysts of 10.0-13.5 x 7.5-11.5 microm, undergoes endogenous deve ... | 2002 | 11721195 |
| parallel origins of duplications and the formation of pseudogenes in mitochondrial dna from parthenogenetic lizards (heteronotia binoei; gekkonidae). | analysis of mitochondrial dnas (mtdnas) from parthenogenetic lizards of the heteronotia binoei complex with restriction enzymes revealed an approximately 5-kb addition present in all 77 individuals. cleavage site mapping suggested the presence of a direct tandem duplication spanning the 16s and 12s rrna genes, the control region and most, if not all, of the gene for the subunit 1 of nadh dehydrogenase (nd1). the location of the duplication was confirmed by southern hybridization. a restriction e ... | 1991 | 1960740 |
| evolutionary dynamics of mitochondrial dna duplications in parthenogenetic geckos, heteronotia binoei. | mitochondrial dna (mtdna) from triploid parthenogenetic geckos of the heteronotia binoei complex varies in size from 17.2 to 27.6 kilobases (kb). comparisons of long vs. short genomes using restriction endonucleases revealed a series of tandem direct duplications ranging in size from 1.2 to 10.4 kb. this interpretation was supported by transfer-hybridization experiments which also demonstrated that coding sequences were involved. some of the duplications have been modified by deletion and restri ... | 1991 | 1682212 |
| the origin and evolution of parthenogenesis in heteronotia binoei (gekkonidae): evidence for recent and localized origins of widespread clones. | the parthenogenetic form of the gecko lizard species heteronotia binoei has an unusually broad geographic range and high genetic diversity. restriction enzyme analysis revealed two basic types of mitochondrial dna (mtdna) among the parthenogens. one type is restricted to western populations. the other type, analyzed in detail here, was widespread, being found in populations from central to western australia. the diversity within this widespread type was low. the variation among parthenogens from ... | 1991 | 1682211 |
| ultrastructural review of choleoeimeria spp., a coccidium infecting the gall-bladder epithelium of reptiles. | choleoeimeria paperna and landsberg, 1989 is a reptile coccidium with unique features. its endogenous development occurs in the cells of the bile epithelium. its host cell while becoming hypertrophic emerges above the epithelial surface. the following species studied by electron microscopy: c. alloagamae paperna, 2007 from agama sp. west africa; c. allogehyrae paperna, 2007 from gehyra australis and c. heteronotis paperna, 2007 from heteronotia binoei, from australia, and c. pachydactyli paperna ... | 2007 | 18689236 |
| parthenogenesis in the endemic australian lizard heteronotia binoei (gekkonidae). | chromosome variation in the gekkonid lizard heteronotia binoei reveals that this endemic australian vertebrate reproduces by parthenogenesis. triploid parthenogenetic females are distributed throughout central and western australia and are all heterozygotes for one or more pericentric inversions that also distinguish the extant bisexual diploid cytotypes. these data on karyotype provide strong evidence that the various clones have arisen through multiple hybridization events between bisexual anc ... | 1983 | 17813878 |
| increased capacity for sustained locomotion at low temperature in parthenogenetic geckos of hybrid origin. | the evolution of parthenogenesis is typically associated with hybridization and polyploidy. these correlates of parthenogenesis may have important physiological consequences that need be taken into account in understanding the relative merits of sexual and parthenogenetic reproduction. we compared the thermal sensitivity of aerobically sustained locomotion in hybrid/triploid parthenogenetic races of the gecko heteronotia binoei and their diploid sexual progenitors. endurance times at low tempera ... | 2006 | 15887078 |
| multiple origins and rapid evolution of duplicated mitochondrial genes in parthenogenetic geckos (heteronotia binoei; squamata, gekkonidae). | accumulating evidence for alternative gene orders demonstrates that vertebrate mitochondrial genomes are more evolutionarily dynamic than previously thought. several lineages of parthenogenetic lizards contain large, tandem duplications that include rrna, trna, and protein-coding genes, as well as the control region. such duplications are hypothesized as intermediate stages in gene rearrangement, but the early stages of their evolution have not been previously studied. to better understand the e ... | 2007 | 17921488 |
| effects of weed-management burning on reptile assemblages in australian tropical savannas. | fire is frequently used for land management purposes and may be crucial for effective control of invasive non-native plants. nevertheless, fire modifies environments and may affect nontarget native biodiversity, which can cause conflicts for conservation managers. native australian reptiles avoid habitat invaded by the alien plant rubber vine (cryptostegia grandiflora) and may be susceptible to the impacts of burning, a situation that provides a model system in which to examine possible conserva ... | 2009 | 18950473 |
| diversification and persistence at the arid-monsoonal interface: australia-wide biogeography of the bynoe's gecko (heteronotia binoei; gekkonidae). | late neogene aridification in the southern hemisphere caused contractions of mesic biota to refugia, similar to the patterns established by glaciation in the northern hemisphere, but these episodes also opened up new adaptive zones that spurred range expansion and diversification in arid-adapted lineages. to understand these dynamics, we present a multilocus (nine nuclear introns, one mitochondrial gene) phylogeographic analysis of the bynoe's gecko (heteronotia binoei), a widely distributed com ... | 2010 | 20298463 |
| does incubation temperature fluctuation influence hatchling phenotypes in reptiles? a test using parthenogenetic geckos. | many lineages of parthenogenetic organisms have persisted through significant environmental change despite the constraints imposed by their fixed genotype and limited evolutionary potential. the ability of parthenogens to occur sympatrically with sexual relatives may in part be due to phenotypic plasticity in their responses to their environment, especially with respect to incubation temperature--a maternally selected trait. here we measured the incubation temperatures selected by two lineages o ... | 2010 | 20477533 |
| nonadaptive evolution of mitochondrial genome size. | genomes vary greatly in size and complexity, and identifying the evolutionary forces that have generated this variation remains a major goal in biology. a controversial proposal is that most changes in genome size are initially deleterious and therefore are linked to episodes of decrease in effective population sizes. support for this hypothesis comes from large-scale comparative analyses, but vanishes when phylogenetic nonindependence is taken into account. another approach to test this hypothe ... | 2011 | 21884067 |
| physiological implications of genomic state in parthenogenetic lizards of reciprocal hybrid origin. | parthenogenesis often evolves in association with hybridization, but the associated ecological consequences are poorly understood. the australian gecko heteronotia binoei is unusual because triploid parthenogenesis evolved through reciprocal crosses between two sexual lineages, resulting in four possible cytonuclear genotypes. in this species complex, we compared the performance of these parthenogenetic genotypes with their sexual progenitors for a suite of physiological traits (metabolic rate, ... | 2012 | 22192477 |
| mitochondrial swinger replication: dna replication systematically exchanging nucleotides and short 16s ribosomal dna swinger inserts. | assuming systematic exchanges between nucleotides (swinger rnas) resolves genomic 'parenthood' of some orphan mitochondrial transcripts. twenty-three different systematic nucleotide exchanges (bijective transformations) exist. similarities between transcription and replication suggest occurrence of swinger dna. genbank searches for swinger dna matching the 23 swinger versions of human and mouse mitogenomes detect only vertebrate mitochondrial swinger dna for swinger type at+cg (from five differe ... | 2014 | 25283331 |
| multilocus phylogeography reveals nested endemism in a gecko across the monsoonal tropics of australia. | multilocus phylogeography can uncover taxonomically unrecognized lineage diversity across complex biomes. the australian monsoonal tropics include vast, ecologically intact savanna-woodland plains interspersed with ancient sandstone uplands. although recognized in general for its high species richness and endemism, the biodiversity of the region remains underexplored due to its remoteness. this is despite a high rate of ongoing species discovery, especially in wetter regions and for rock-restric ... | 2016 | 26671627 |
| are pheromones key to unlocking cryptic lizard diversity? | animals use mating traits to compete for, attract, and choose mates. because mating traits influence mate choice, the divergence of mating traits between populations can result in reproductive isolation. this can occur without associated morphological divergence, producing reproductively isolated cryptic species that are visually indistinguishable. thus, identifying the mating traits in morphologically conservative groups is key to resolving diversity and speciation processes. lizards contain ma ... | 2019 | 31318281 |
| morphological and physiological correlates of hybrid parthenogenesis. | asexuality frequently evolves in association with hybridity and polyploidy. the phenotypic consequences of this association must be understood before we can fully appreciate the reason for the short-term success, and the long-term failure, of asexual genetic systems. parthenogenetic forms within the australian gecko complex heteronotia binoei are triploid hybrids and overlap geographically with both of their parental taxa as well as another sexual lineage. we compared nine morphological and nine ... | 2004 | 29641921 |
| the origin and evolution of parthenogenesis in heteronotia binoei (gekkonidae): extensive genotypic diversity among parthenogens. | variation at 18 allozyme loci was assayed among representatives of the geographically widespread, triploid parthenogenetic form of heteronotia binoei. a minimum of 52 different genotypes were observed among 143 individuals. virtually all localities sampled had multiple genotypes among the unisexuals. this represents unusually high genotypic diversity for a unisexual vertebrate. heterozygosity in the triploids was higher than in diploid bisexual populations of h. binoei. comparison with the allel ... | 1989 | 28564148 |
| new species of choleoeimeria (apicomplexa: eimeriidae), coccidia of bile-bladders of reptiles, illustrating a multiplicity of host cell-parasite interrelations. | oocyst characteristics and histological features of the endogenous development of bile-bladder coccidia of the genus choleoeimeria paperna and landsberg, 1989 are described and the main features for species differentiation are discussed for the following new species: c. allogamae n. sp. from agama sp., cameroon, west africa; c. allogehyrae n. sp. from gehyra australis, magnetic island (type) and mainland n queensland, australia; c. boulii n. sp. from gehyra variegata, sw queensland, australia; c ... | 2007 | 18412050 |