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Добірка наукової літератури з теми "Malurus coronatus"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Malurus coronatus"

Skroblin, Anja, Robert Lanfear, Andrew Cockburn, and Sarah Legge. "Inferring population connectivity across the range of the purple-crowned fairy-wren (Malurus coronatus) from mitochondrial DNA and morphology: implications for conservation management." Australian Journal of Zoology 60, no. 3 (2012): 199. http://dx.doi.org/10.1071/zo12093.

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Knowledge of population structure and patterns of connectivity is required to implement effective conservation measures for the purple-crowned fairy-wren (Malurus coronatus), a threatened endemic of northern Australia. This study aimed to identify barriers to dispersal across the distribution of M. coronatus, investigate the impact that the recent declines may have on population connectivity, and propose conservation actions to maintain natural patterns of gene flow. Analysis of mitochondrial DNA sequences from 87 M. coronatus identified two phylogenetic clusters that corresponded with the phenotypically defined western (M. c. coronatus) and eastern (M. c. macgillivrayi) subspecies. The genetic divergence between these subspecies was consistent with isolation by a natural barrier to gene flow, and supports their separate conservation management. Within the declining M. c. coronatus, the lack of genetic divergence and only slight morphological difference between remnant populations indicates that populations were recently linked by gene flow. It is likely that widespread habitat degradation and the recent extirpation of M. c. coronatus from the Ord River will disrupt connectivity between, and dynamics within, remnant populations. To prevent further declines, conservation of M. coronatus must preserve areas of quality habitat and restore connectivity between isolated populations.

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Skroblin, Anja, Andrew Cockburn, and Sarah Legge. "The population genetics of the western purple-crowned fairy-wren (Malurus coronatus coronatus), a declining riparian passerine." Australian Journal of Zoology 62, no. 3 (2014): 251. http://dx.doi.org/10.1071/zo13087.

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We investigate the population genetic structure of the declining western subspecies of the purple-crowned fairy-wren (Malurus coronatus coronatus) in order to guide conservation management recommendations for this riparian habitat specialist. Our analysis of multilocus microsatellite data, from 79 individuals sampled from across the species’ range, indicates that M. c. coronatus occurs as genetically differentiated subpopulations that correspond to catchment boundaries or expansive gaps in habitat along waterways. The genetic similarity of large populations of fairy-wrens on four catchments (Fitzroy, Durack, Drysdale and Victoria) indicates widespread recent gene flow, whereas the high genetic distinctiveness of the Bindoola and Isdell catchments may reflect the current geographic isolation of these smaller populations. Genetic differentiation of these smaller geographically isolated populations affirms the negative effect that habitat degradation and fragmentation can have on population connectivity. A regional-scale approach to conservation with a focus on preventing degradation and enhancing connectivity may be critical to safeguard the persistence of M. c. coronatus subpopulations.

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Skroblin, Anja, and Sarah Legge. "The distribution and status of the western subspecies of the Purple-crowned Fairy-wren (Malurus coronatus coronatus)." Emu - Austral Ornithology 110, no. 4 (December 2010): 339–47. http://dx.doi.org/10.1071/mu10029.

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Doorn, Annemarie van, and Jenni Low Choy. "A Description of the Primary Habitat of the Purple-crowned Fairy-wren 'Malurus Coronatus Coronatus' in the Victoria River District, N.T." Northern Territory Naturalist 21 (October 2009): 24–33. http://dx.doi.org/10.5962/p.267873.

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SKROBLIN, ANJA, and SARAH LEGGE. "Influence of fine-scale habitat requirements and riparian degradation on the distribution of the purple-crowned fairy-wren (Malurus coronatus coronatus) in northern Australia." Austral Ecology 37, no. 8 (December 9, 2011): 874–84. http://dx.doi.org/10.1111/j.1442-9993.2011.02331.x.

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Skroblin, Anja, and Sarah Legge. "Conservation of the Patchily Distributed and Declining Purple-Crowned Fairy-Wren (Malurus coronatus coronatus) across a Vast Landscape: The Need for a Collaborative Landscape-Scale Approach." PLoS ONE 8, no. 5 (May 29, 2013): e64942. http://dx.doi.org/10.1371/journal.pone.0064942.

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Christidis, Leslie, and Richard Schodde. "Relationships within the Australo-Papuan Fairy-wrens (Aves : Malurinae) : an Evaluation of the Utility of Allozyme Data." Australian Journal of Zoology 45, no. 2 (1997): 113. http://dx.doi.org/10.1071/zo96068.

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Allozyme variation at 39 presumptive loci was screened across 180 specimens representing 18 species of Australo-Papuan fairy-wrens (Maluridae). The results identified two major clusters within Malurus. One comprised M. cyaneus, M. splendens, M. coronatus, M. melanocephalus, M. leucopterus and M. alboscapulatus. The other comprisedM. lamberti, M. amabilis, M. pulcherrimus and M. elegans. M. grayi and M. cyanocephalus were variously associated with these two assemblages. Most analyses aligned Clytomias with Malurus relative to Stipiturus. The findings from the present study indicate that allozyme data are well suited to phylogenetic inference whether analysed as distances or as discrete characters, provided that only relatively robust branches are accepted. When only such branches were considered there was complete congruence between the analyses. Nevertheless, congruence per se between analyses was not necessarily a reflection of robust branching patterns, as illustrated by the position of Clytomias. Of analyses with discrete characters, those that treated loci as characters and the commonest allele as the state appeared to be a particularly effective approach, provided that the distribution of discarded alleles in the initial topology is considered a posteriori. The allozyme data confirmed several previously accepted lineages, and identified surprising new links between several taxa as well. These links were supported biogeographically and, in some aspects, morphologically. Those phylogenetic nodes that were poorly resolved can now be tested by more sensitive DNA-based approaches. By using allozymes to establish robust clades and then to identify areas in need of further resolution, DNA-based studies can be focused better on phylogenetic problem areas, thereby promoting more efficient use of time and resources.

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Roast, Michael J., Nataly Hidalgo Aranzamendi, Marie Fan, Niki Teunissen, Matthew D. Hall, and Anne Peters. "Fitness outcomes in relation to individual variation in constitutive innate immune function." Proceedings of the Royal Society B: Biological Sciences 287, no. 1938 (November 4, 2020): 20201997. http://dx.doi.org/10.1098/rspb.2020.1997.

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Although crucial for host survival when facing persistent parasite pressure, costly immune functions will inevitably compete for resources with other energetically expensive traits such as reproduction. Optimizing, but not necessarily maximizing, immune function might therefore provide net benefit to overall host fitness. Evidence for associations between fitness and immune function is relatively rare, limiting our potential to understand ultimate fitness costs of immune investment. Here, we assess how measures of constitutive immune function (haptoglobin, natural antibodies, complement activity) relate to subsequent fitness outcomes (survival, reproductive success, dominance acquisition) in a wild passerine ( Malurus coronatus ). Surprisingly, survival probability was not positively linearly predicted by any immune index. Instead, both low and high values of complement activity (quadratic effect) were associated with higher survival, suggesting that different immune investment strategies might reflect a dynamic disease environment. Positive linear relationships between immune indices and reproductive success suggest that individual heterogeneity overrides potential resource reallocation trade-offs within individuals. Controlling for body condition (size-adjusted body mass) and chronic stress (heterophil-lymphocyte ratio) did not alter our findings in a sample subset with available data. Overall, our results suggest that constitutive immune components have limited net costs for fitness and that variation in immune maintenance relates to individual differences more closely.

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Teunissen, Niki, Sjouke A. Kingma, and Anne Peters. "Predator defense is shaped by risk, brood value and social group benefits in a cooperative breeder." Behavioral Ecology 31, no. 3 (March 20, 2020): 761–71. http://dx.doi.org/10.1093/beheco/araa012.

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Abstract Predation is a major cause of mortality and nest failure in birds. Cooperative predator defense can enhance nest success and adult survival but, because it is inherently risky, dynamic risk assessment theory predicts that individuals modify defense behavior according to the risk posed by the predator. Parental investment theory, on the other hand, predicts that reproductive payoffs (brood value) determine investment in nest defense. We propose that, in cooperative breeders, fitness benefits deriving from the survival of other group members may additionally influence defense behavior (social group benefits theory). We tested predictions of these theories in the cooperatively breeding purple-crowned fairy-wren, Malurus coronatus, where brood value is higher for breeders, but social group benefits more important for helpers. We recorded experimentally induced individual defense behaviors in response to predator models presented near nests, representing differing levels of threat to nests and adults. As predicted, 1) individuals engaged in less risky defenses when encountering a more dangerous predator (dynamic risk assessment theory); 2) individuals defended older broods more often, and breeders defended more than helpers (parental investment theory); and 3) helpers were more likely to respond to a predator of adults (social group benefits theory). Our findings highlight that predator defense in cooperative breeders is complex, shaped by the combination of immediate risk and multiple benefits.

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Nolazco, Sergio, Michelle L. Hall, Sjouke A. Kingma, Kaspar Delhey, and Anne Peters. "No evidence for an adaptive role of early molt into breeding plumage in a female fairy wren." Behavioral Ecology 31, no. 2 (December 11, 2019): 411–20. http://dx.doi.org/10.1093/beheco/arz203.

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Abstract The evolution of ornaments as sexually selected signals is well understood in males, but female ornamentation remains understudied. Fairy wrens offer an excellent model system, given their complex social structure and mating systems, and the diversity of female ornamentation. We investigated whether early molt into ornamental breeding plumage plays an adaptive role in females of the monogamous purple-crowned fairy wren Malurus coronatus, the only fairy wren known to have female seasonal plumage. Using 6 years of monitoring, we found that the timing of female molt was similar to males, but there was no evidence for assortative mating. Like males (previous study), older and dominant individuals acquired their breeding plumage earlier; however, in contrast to males, early molt did not seem to be costly since unfavorable environmental conditions or previous reproductive effort did not delay molt. Early female molt was not associated with any indicator of reproductive quality nor did it attract additional offspring care by their partners. We also found no association between early molt and the likelihood of acquiring a dominant (breeding) position or with the presence or proximity to same-sex rivals. Our study results, which are similar to previous findings in conspecific males, suggest that directional selection for early molt might be relaxed in this species, in contrast to other genetically polygamous fairy wrens in which early molt predicts extrapair mating success in males. However, the finding that molt timing is status dependent raises the possibility that other attributes of the ornament may fulfill an adaptive function in females.

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Більше джерел

Дисертації з теми "Malurus coronatus"

Kingma, Sjouke Anne [Verfasser]. "The evolution of the social and genetic mating system of purple-crowned fairy-wrens Malurus coronatus / Sjouke Anne Kingma." Konstanz : Bibliothek der Universität Konstanz, 2011. http://d-nb.info/1017360472/34.

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Skroblin, Anja. "Phylogeography and conservation biology of the Purple-crowned Fairy-wren, Malurus coronatus." Phd thesis, 2012. http://hdl.handle.net/1885/9466.

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Анотація:

The purple-crowned fairy-wren (Malurus coronatus) is a declining passerine that is restricted to the dense patches of vegetation that grow along waterways in the wet-dry tropics of northern Australia. The species is threatened by ongoing degradation of riparian habitat caused by the grazing and trampling of introduced herbivores, intense fires and weed incursion. Although the western subspecies (Malurus coronatus coronatus) has been listed as endangered, conservation has been hampered by poor information regarding its distribution and what factors influence its fine-scale occurrence. This thesis aims to rectify these knowledge gaps and produce recommendations for management goals that could improve the conservation of M. c. coronatus, its riparian habitat, and other vulnerable species within the habitat. To validate the use of M. c. coronatus as a separate unit for conservation, we firstly affirmed the genetic and thus evolutionary distinctiveness of the morphologically defined subspecies of purple-crowned fairy-wren (M. c. coronatus and Malurus coronatus macgillivrayi). Because M. c. coronatus was of greater conservation concern it became the focus of the subsequent chapters. Extensive aerial and ground surveys, accompanied by an analysis of population genetics, revealed that M. c. coronatus occurs as six genetically divergent sub-populations on the Fitzroy, Durack, Drysdale, Isdell, Victoria and northern Pentecost catchments. The distribution of the species appears to be constrained by three factors: 1) fine-scale vegetation structure, 2) presence of threatening processes, and 3) the extent and spatial pattern of habitat across the landscape. The fine-scale probability of occurrence increased with increasing density of the mid-storey and increasing height of emergent trees, while the presence of potential threatening processes (cattle grazing, fire and weeds) were variously negatively correlated with decreased levels of these important habitat attributes. Suitable habitat for the species was extremely fragmented and widely dispersed along waterways in the Kimberley section of the species distribution. Suitable habitat occurred mainly on pastoral lands. The on-going decline of the purple-crowned fairy-wren signals the need for a targeted approach to conservation management; we suggest a regional plan that outlines management recommendations that are tailored to the specific requirements of each sub-population. The most urgent conservation attention may be required in the smallest subpopulations on the Isdell and Pentecost catchments. These populations are best managed through exclusion of herbivores and careful, fine-scale fire management. Elsewhere however, large and diffuse populations may be better maintained using landscape-scale conservation measures. Although reserves play a vital role in ecosystem conservation, landscape-scale environmental management, undertaken across properties of varying tenure, may be vital to manage widely dispersed species such as the purple-crowned fairy-wren that occur at low density across vast landscapes.

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