Relevant bibliographies by topics / Capricorn Yellow Chat

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Academic literature on the topic 'Capricorn Yellow Chat'

Author: Grafiati
Published: 19 February 2023

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Journal articles on the topic "Capricorn Yellow Chat"

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Houston, Wayne A., William Aspden, Robert Black, Rod Elder, Ian Carruthers, Lorelle Campbell, and Leif Black. "Mitochondrial phylogeography of the critically endangered Capricorn yellow chat (Epthianura crocea macgregori)." Australian Journal of Zoology 63, no. 5 (2015): 350. http://dx.doi.org/10.1071/zo15047.

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The critically endangered Capricorn yellow chat (CYC) is endemic to coastal central Queensland on marine plains where it occurs in three areas, numbering <300 birds. Recent industrial expansion in the region has increased the threat to the CYC. To assist management of the subspecies, a phylogeographical evaluation of the CYC using mitochondrial DNA was undertaken. We found no genetic diversity within, nor genetic divergence between, the two areas at the northern and southern extremes of their current distribution, and only slight morphological differences. These findings suggest that the two groups of CYC represent daughter populations of an ancestral population that was affected by a genetic bottleneck in the recent past. Implications for conservation of the subspecies could be increased vulnerability to environmental change. A preliminary evaluation of the divergence between the CYC and its nearest subspecies, the widespread inland yellow chat, indicate a time to the most recent common ancestor of 215 000 years or less. This timespan overlaps two periods of glacial aridity during which xeric habitats used by yellow chats for breeding, such as semiarid and arid swamps, may have expanded, allowing colonisation of the coastal marine plains. CYCs may represent a relictual population from a previously more xeric era that has subsequently become isolated as the region became wetter following glacial maxima.
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HOUSTON, WAYNE A., ROD ELDER, and ROBERT BLACK. "Population trend and conservation status of the Capricorn Yellow Chat Epthianura crocea macgregori." Bird Conservation International 28, no. 1 (March 14, 2017): 100–115. http://dx.doi.org/10.1017/s0959270916000526.

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SummaryThe average population size of Capricorn Yellow Chat Epthianura crocea macgregori was estimated at 251 +/-31 (SE) by repeated surveys over seven years (2004–2010) using consistent search effort at known occupied sites. Because the survey period coincided with a mixture of dry and wet years (drought from 2004 to 2007 followed by flood rainfall in early 2008 and 2010), it is particularly valuable as a preliminary benchmark upon which to base management decisions. Most of the population (74.5%) was in the Broad Sound area in the north, with lower numbers in the Fitzroy River delta area in the south (22%) and at Curtis Island (3.5%). Sites on Torilla Plain in Broad Sound accounted for two-thirds of the estimated population, making it a priority for conservation efforts. Depending on habitat configuration, some Capricorn Yellow Chats showed a seasonal pattern of habitat use, moving from flooded breeding habitats as they dried to refuge sites such as salt fields or upper marine plains in the dry season; distances moved being < 10 km. Standard surveys from Torilla Plain showed that the chat count during a sequence of above-average rainfall years was almost double that of the average for drought years: 162 +/-28 (2008–2015) compared with 85 +/-15 (2004–2007) respectively. Low population size, large annual fluctuations in population with prior rainfall, rapid declines in low rainfall years, a fragmented distribution and almost half the population concentrated at one site point to a subspecies vulnerable to chance events. Increased climatic extremes predicted by climate change such as higher temperatures, evaporation rates, extended droughts and more intense rainfall events add to its vulnerability.
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Houston, Wayne A., Robert L. Black, and Rod J. Elder. "Distribution and habitat of the critically endangered Capricorn Yellow Chat Epthianura crocea macgregori." Pacific Conservation Biology 19, no. 1 (2013): 39. http://dx.doi.org/10.1071/pc130039.

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The Capricorn Yellow Chat (Meliphagidae: Epthianura crocea macgregori) is a poorly known, endangered passerine of coastal north-eastern Australian wetlands. Recent research has highlighted the need for evidence based management and that recovery programmes may be hampered by a lack of sound ecological knowledge. Capricorn Yellow Chats were found at 15 sites near Rockhampton between Broad Sound and the Fitzroy River delta in the south. Overall, suitable habitat was limited with an area occupied of about 6 000 ha, confirming the need for careful management. Habitat may be typified as grass-sedge wetlands or tall supratidal saltmarshes that are temporarily flooded, with pools becoming brackish to hypersaline as they dry. Over 96% of sightings were on coastal plains formed by marine sedimentation processes, most without current tidal influence, and many less than 5 m above sea level. The remaining 4% were associated with alluvial-formed plains, but only where these bordered existing marine plain sites; suggesting a preference for marine plain habitats, possibly reflecting structural differences and foraging preferences (marine plains tend to be more open due to the presence of salt-tolerant samphire vegetation). Sea level rise was identified as a major threat to the subspecies with chat sightings at most sites averaging less than 2 m above current highest astronomical tidal influence, and sites becoming tidal or with regular storm surge influence under future modest predicted sea level rise scenarios of 0.5 m by 2100. Most sites had some form of banking to reduce tidal influence and promote freshwater pasture grasses for cattle production. The site supporting most chats had small banks that allowed floods to flow around them, maintaining connectivity with the downstream marine systems. This study contributes to baseline information essential to the evaluation of any future management interventions; thus avoiding the pitfalls hampering much of the global conservation efforts directed at threatened species.
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HOUSTON, WAYNE A., WILLIAM J. ASPDEN, ROD ELDER, ROBERT L. BLACK, LINDA E. NEAVES, ANDREW G. KING, and RICHARD E. MAJOR. "Restricted gene flow in the endangered Capricorn Yellow Chat Epthianura crocea macgregori: consequences for conservation management." Bird Conservation International 28, no. 1 (November 7, 2017): 116–25. http://dx.doi.org/10.1017/s0959270917000284.

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SummaryThe Yellow Chat Epthianura crocea is comprised of three disjunct subspecies. Subspecies E. c. macgregori (Capricorn Yellow Chat) is listed as Critically Endangered under the EPBC Act and has a distribution that also appears to be disjunct, with a limited geographic area of less than 7,000 ha. Some populations are threatened by rapid industrial development, and it is important for conservation of the subspecies to determine the extent to which the putative populations are connected. We used 14 microsatellite markers to measure genetic diversity and to determine the extent of gene flow between two disjunct populations at the northern and southern extremes of the subspecies’ range. No significant differences in genetic diversity (number of alleles and heterozygosity) were observed, but clear population structuring was apparent, with obvious differentiation between the northern and southern populations. The most likely explanation for reduced gene flow between the two populations is either the development of a geographic barrier as a consequence of shrinkage of the marine plains associated with the rise in sea levels following the last glacial maxima, or reduced connectivity across the largely unsuitable pasture and forest habitat that now separates the two populations, exacerbated by declining population size and fewer potential emigrants. Regardless of the mechanism, restricted gene flow between these two populations has important consequences for their ongoing conservation. The relative isolation of the smaller southern groups (the Fitzroy River delta and Curtis Island) from the much larger northern group (both sides of the Broad Sound) makes the southern population more vulnerable to local extinction. Conservation efforts should focus on nature refuge agreements with land owners agreeing to maintain favourable grazing management practices in perpetuity, particularly in the northern area where most chats occur. Supplemental exchanges of individuals from northern and southern populations should be explored as a way of increasing genetic diversity and reducing inbreeding.
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Holmes, Tim Q., Brian W. Head, Hugh P. Possingham, and Stephen T. Garnett. "Strengths and vulnerabilities of Australian networks for conservation of threatened birds." Oryx 51, no. 4 (November 8, 2016): 673–83. http://dx.doi.org/10.1017/s0030605316000454.

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AbstractWe analysed the supportive social networks associated with the conservation of six threatened Australian bird taxa, in one of the first network analyses of threatened species conservation programmes. Each example showed contrasting vulnerabilities. The Alligator Rivers yellow chat Epthianura crocea tunneyi had the smallest social network and no real action was supported. For the Capricorn yellow chat Epthianura crocea macgregori the network was centred on one knowledgeable and committed actor. The orange-bellied parrot Neophema chrysogaster had a strongly connected recovery team but gaps in the overall network could limit communication. The recovery teams for the swift parrot Lathamus discolor and Baudin's black-cockatoo Calyptorhynchus baudinii had strong links among most stakeholders but had weak ties to the timber industry and orchardists, respectively, limiting their capacity to manage threatening processes. Carnaby's black cockatoo Calyptorhynchus latirostris seemed to have the most effective social network of any of the taxa studied but may be vulnerable to skill shortages. In each case the network analysis pointed to gaps that could be filled to enhance the conservation effort, and highlighted the importance of recovery teams. The research suggests that formal network analysis could assist in the design of more effective support mechanisms for the conservation of threatened species.
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Houston, Wayne, Robert Black, Rod Elder, and Damon Shearer. "Breeding ecology of a marine plain dependent passerine, the Capricorn Yellow Chat Epthianura crocea macgregori, in north-eastern Australia." Australian Field Ornithology 37 (2020): 15–25. http://dx.doi.org/10.20938/afo37015025.

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Houston, Wayne A., Rod Elder, Robert L. Black, Damon Shearer, Michael Harte, and Andy Hammond. "Climate change, mean sea levels, wetland decline and the survival of the critically endangered Capricorn Yellow Chat." Austral Ecology, April 1, 2020. http://dx.doi.org/10.1111/aec.12886.

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Houston, Wayne A., Roger Jaensch, Rod J. Elder, Robert L. Black, Allan Briggs, and Damon Shearer. "Tide-excluded banked wetlands on the marine plains of northeastern Australia provide important habitat for migratory shorebirds, other threatened bird species and the Capricorn Yellow Chat." Pacific Conservation Biology, 2023. http://dx.doi.org/10.1071/pc22027.

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Dissertations / Theses on the topic "Capricorn Yellow Chat"

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(9805508), Wayne Houston. "Distribution, breeding ecology, population and habitat use of the critically endangered Capricorn Yellow Chat Epthianura crocea macgregori Keast (Aves: Meliphagidae)." Thesis, 2011. https://figshare.com/articles/thesis/Distribution_breeding_ecology_population_and_habitat_use_of_the_critically_endangered_Capricorn_Yellow_Chat_Epthianura_crocea_macgregori_Keast_Aves_Meliphagidae_/13463189.

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"This the first detailed study of the Capricorn Yellow Chat, a critically endangered ground-adapted bird that was considered to be extinct until its rediscovery in 1992. It provides an overview of its distribution, habitat, breeding ecology, population size and the influence of climatic and environmental variables on habitat use and breeding".
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