Posidonia australis meadows declined by 2–40% total area at 11 of 14 study sites (Fig 4; F 4,13 = 14.77; P = 0.001). This project aimed to find a solution: ‘Operation Posidonia’ asks citizen scientists to collect detached shoots washed up on the beach after storms, Reproduction at the extremes: pseudovivipary, hybridization and genetic mosaicism in Posidonia australis (Posidoniaceae) Posidonia australis was identified as one of the dominant meadow forming species in Western Australia and therefore was selected to investigate the utility of this framework. Posidoniaceae Agriculture & Biology Ann Bot. 2006) and the unsuitability of harvesting source shoots from declining protected meadows. Source Title Background and Aims Organisms occupying the edges of natural geographical ranges usually survive at the extreme limits of their innate physiological tolerances. MATERIALS AND METHODS Shoots of the Posidonia australis Hook. Annals of Botany. Our research examines flowering and fruiting density, genetic diversity and mating system in Posidonia australis. This species is found in waters around the southern coast of Australia. Members of the ostenfeldii group of Posidonia also produce flowers and fruit (Orth 1999). The hydrophilous seagrass Posidonia australis has a wide range of multilocus outcrossing rates (t), which vary from 0 to 0.89, with “apparent” outcrossing rates varying from 0 to 0.42 among the seven populations sampled.This pattern of outcrossing rate indicates that water pollination (hydrophily) is less uniform than wind pollination and more similar to animal pollination in its variability. Extreme and prolonged fluctuations in environmental conditions, often associated with Reproduction at the extremes: pseudovivipary, hybridization and genetic mosaicism in Posidonia australis (Posidoniaceae). Keywords: Coastal circulation, Dispersal, Population connectivity, Posidonia australis, Seagrasses Background Quantifying population connectivity within coastal eco-systems is a crucial component of the management and conservation of many marine populations, especially when it becomes necessary to forecast how increasing ences in the reproduction between hydrophilous angiosperms and pollination systems where water does not act as a pollen vector. f. bearing two or three mature leaves and an inflorescence were collected in early October from Corner Inlet, Victoria. (1990) followed 900 transplants for 3 months, proved rather inconclusive. Like all members of the Posidoniaceae, P. australis has bisexual flowers, each containing a single ovule (Remizowa et al., 2012). Main content area. Reproduction at the extremes: pseudovivipary, hybridization and genetic mosaicism in Posidonia australis (Posidoniaceae) ... angiosperm Posidonia australis, growing at the northern range edge (upper thermal and ... DOI: 10.1093/aob/mcv162 PubMed: 26578720 PubMed Central: PMC4724040 6. Annals of Botany 117: 237-247 Recent research has shown that Posidonia australis can sequester carbon 35 times more efficiently than rainforests; this species is found in waters around the southern coast of Australia. Flowers of P. australis are held above the canopy whereas those of P. sinuosa are below the canopy (Cambridge and Kuo 1979). The reproduction of P. australis occurs usually through sexual or asexual methods but, under extreme conditions, by pseudovivipary method. Range edge populations are also likely to be better adapted to more extreme conditions for future survival and resilience in warming environments. Map showing the 13 sampled Posidonia australis meadows from the Cockburn Sound area, Western Australia. The largest temperate seagrass meadows on the planet were severely impacted by an extreme heatwave. Posidonia australis) are at a disadvantage given that the availability of sexual propagules will be limited to the period (season) and duration of reproduction. Posidonia australis adults and seedlings were grown under yellow (top left), full-spectrum (top middle), blue (top right), red (bottom middle) and green (bottom right) light in independent aquarium tanks, with four replicates per treatment (n = 20 tanks, but only 6 are shown). 117 (2): pp. There were no signiﬁcant diﬀe-rences, within each species, between the line, block ﬁve, and block nine treatments. Seagrasses of the genus Posidonia can form an irregular seascape due to erosional processes exposing thick walls of organic matter-rich soils. Posidonia australis Hook.f. Annals of Botany. Distribution. This equates to a total loss of 7.61 ha, or 21.2% of all seagrass meadow in the study area, between October 2009 and September 2014. Sinclair EA, Statton J, Hovey R, Anthony J, Dixon KW, and Kendrick GA (2016) Reproduction at the extremes: pseudovivipary and genetic mosaicism in Posidonia australis (Posidoniaceae) Posidonia australis Hooker (Posidoniaceae). The first page of this article is displayed as the abstract. 2016; 117(2):237-47 (ISSN: 1095-8290) Sinclair EA; Statton J; Hovey R; Anthony JM; Dixon KW; Kendrick GA important limitation for P. australis restoration is the low level of sexual reproduction (Gobert et al. However, little is known about the location and characteristics of these particular formations. An empirical examination of site selection was undertaken to determine a potential transplant site for Posidonia australis. Restoration of meadows of Posidonia australis is also a very difficult and slow process, which has proved largely unsuccessful to date (West et al. In contrast to Posidonia oceanica, Posidonia australis flowers frequently and produces large numbers of seeds (Figure 3-1). Waycott M, Sampson J (1997) The mating system of an hydrophilous angiosperm Posidonia australis (Posidoniaceae). Distribution. Posidonia oceanica, commonly known as Neptune grass or Mediterranean tapeweed, is a seagrass species that is endemic to the Mediterranean Sea.It forms large underwater meadows that are an important part of the ecosystem. The reproduction of P. australis occurs through sexual or asexual methods but, under extreme conditions, by pseudovivipary method. is a slow-growing marine angiosperm that forms large, dense meadows. Posidonia australis Hook/ is the dominant seagrass in a number of estuaries in south eastern Australia, where it provides habitat and food for a variety of marine fauna, and ... sexual reproduction in P. australis communities is therefore likely to take several decades. T: transplantation site. Posidonia oceanica presents a very distinct axis dimorphism. In contrast, mean P. australis … FIGURE 2. It forms dense meadows of either mixed or single species composition on shallow, sub-tidal coastal platforms. This species is found in waters around the southern coast of Australia. Suzanna M. Evans, Elizabeth A. Sinclair, Alistair G. B. Poore, Keryn F. Bain, Adriana Vergés, Assessing the effect of genetic diversity on the early establishment of the threatened seagrass Posidonia australis using a reciprocal‐transplant experiment, Restoration Ecology, 10.1111/rec.12595, 26, 3, (570-580), (2017). 237-247. dc.identifier.uri Reproduction at the extremes: pseudovivipary, hybridization and genetic mosaicism in Posidonia australis (Posidoniaceae). establish. However, they may also be most at risk of extinction from changing climate. Fingerprint Dive into the research topics of 'Reproduction at the extremes: pseudovivipary, hybridization and genetic mosaicism in Posidonia australis (Posidoniaceae)'. Recent research has shown that Posidonia australis can sequester carbon 35 times more efficiently than rainforests. The reproduction of P. australis occurs usually through sexual or asexual methods but, under extreme conditions, by pseudovivipary method. Recent research has shown that Posidonia australis can sequester carbon 35 times more efficiently than rainforests. The seagrass Posidonia australis is a widespread, temperate Australian species (Cambridge and Kuo, 1979). P. sinuosa averaged one shoot after three months (Figure 3(a)). 237-247. One method these species may utilise to surmount this disadvantage is the ability for vegetative fragments to act as dispersal recruitment units. 117 (2): pp. Posidonia australis Hook f. is the dominant seagrass in a number of estuaries in south eastern Australia, where it provides habitat and food for a variety of marine fauna, and acts as an important nursery area for juvenile fish, including species of commercial importance. 1990, West 1996, Kirkman 1998, Meehan & West 2002, Ganassin & Gibbs 2008). Reproduction at the extremes: pseudovivipary, hybridization and genetic mosaicism in Posidonia australis (Posidoniaceae). Variation in reproductive effort, genetic diversity and mating systems across Posidonia australis seagrass meadows in Western Australia Elizabeth Sinclair , Jane M Edgeloe, Janet Anthony , John Statton , Martin F Breed, Gary Kendrick Shark Bay or Gatharragudu (two-waters) to the Malgana Traditional Owners, is a pristine ecosystem of global significance. Am J Bot 84(5): 621–625 PubMed CrossRef Google Scholar Weir BS, Cockerham CC (1984) Estimating F-statistics for the analysis of population structure. Posidonia oceanica transplant: rhizome length and season Australian species Posidonia australis HOOK in which LARKUM (1976) followed 80 individuals for between 8 and 12 months and WESTet al. It is endemic to temperate Australian waters, and is widespread from Shark Bay, south and eastwards around southern Australia, including the north coast of Tasmania, and to Wallis Lake (central New South Wales). Species that lack a seed bank (e.g. We compare reproductive and genetic data of the temperate seagrass, Posidonia australis on the west coast of Australia. Posidonia sinuosa and Posidonia australis were 5.5 ±0.7and 3.1 ±0.4, respectively. Recruitment of vegetative fragments was deﬁned as attachment to the substrate and subsequent rhizome exten-sion. Vegetative fragment recruitment of both Posidonia australis and Posidonia coriacea was ob-served on Success Bank, Western Australia, beginning in November 1993 (n = 106). Together they form a unique fingerprint.
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