Pollen morphology of the Myrtaceae. Part 3: tribes Chamelaucieae, Leptospermeae and Lindsayomyrteae

Thornhill, Andrew H.; Wilson, Peter G.; Drudge, Jeff; Barrett, Matthew D.; Hope, Geoff; Craven, Lyn A.; Crisp, Michael D.

doi:10.1071/bt11176

Cited by 18 publications

(20 citation statements)

References 16 publications

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“…Two important aspects of this study that permitted this broad scale analysis of pollen features should be highlighted. First, we used an indispensable data set of pollen images generated by an array of palynologists and systematists [ 27 , 50 , 56 , 58 , 75 , 100 – 102 ]. As the field of phylogenetics enters a new era of morphometric and morphospace analyses [ 15 ], the value of detailed data and images from monographic works will be immense.…”

Section: Discussionmentioning

confidence: 99%

“…Finally, we see an important role of these morphometric tools in the identification and phylogenetic placement of fossil pollen within extant clades. As microfossils generally are seen in greater abundance and earlier than macrofossils within plant fossil records, fossil pollen can be important for calibrating DNA phylogenies [ 102 ]. Like other fossils, both the taxonomic identity and the placement of fossil pollen onto branches or nodes of the tree can be contentious [ 146 , 149 – 153 ].…”

Section: Discussionmentioning

confidence: 99%

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A continuous morphological approach to study the evolution of pollen in a phylogenetic context: An example with the order Myrtales

2017

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The study of pollen morphology has historically allowed evolutionary biologists to assess phylogenetic relationships among Angiosperms, as well as to better understand the fossil record. During this process, pollen has mainly been studied by discretizing some of its main characteristics such as size, shape, and exine ornamentation. One large plant clade in which pollen has been used this way for phylogenetic inference and character mapping is the order Myrtales, composed by the small families Alzateaceae, Crypteroniaceae, and Penaeaceae (collectively the “CAP clade”), as well as the large families Combretaceae, Lythraceae, Melastomataceae, Myrtaceae, Onagraceae and Vochysiaceae. In this study, we present a novel way to study pollen evolution by using quantitative size and shape variables. We use morphometric and morphospace methods to evaluate pollen change in the order Myrtales using a time-calibrated, supermatrix phylogeny. We then test for conservatism, divergence, and morphological convergence of pollen and for correlation between the latitudinal gradient and pollen size and shape. To obtain an estimate of shape, Myrtales pollen images were extracted from the literature, and their outlines analyzed using elliptic Fourier methods. Shape and size variables were then analyzed in a phylogenetic framework under an Ornstein-Uhlenbeck process to test for shifts in size and shape during the evolutionary history of Myrtales. Few shifts in Myrtales pollen morphology were found which indicates morphological conservatism. Heterocolpate, small pollen is ancestral with largest pollen in Onagraceae. Convergent shifts in shape but not size occurred in Myrtaceae and Onagraceae and are correlated to shifts in latitude and biogeography. A quantitative approach was applied for the first time to examine pollen evolution across a large time scale. Using phylogenetic based morphometrics and an OU process, hypotheses of pollen size and shape were tested across Myrtales. Convergent pollen shifts and position in the latitudinal gradient support the selective role of harmomegathy, the mechanism by which pollen grains accommodate their volume in response to water loss.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

A continuous morphological approach to study the evolution of pollen in a phylogenetic context: An example with the order Myrtales

2017

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“…Genera within tribe Kanieae form two distinct clades and these correlate with the two observed pollen types of the tribe. Genera Sphaerantia, Ristantia and Mitrantia all had pollen with syncolpate colpi and a distinctive granulate exine (similar to pollen of Leptospermeae and Chamelaucieae species, see Thornhill et al 2012c), whereas the pollen of Kania, Lysicarpus and Tristaniopsis were parasyncolpate, with a less ornamented exine pattern and rounder ambs.…”

Section: Distinct Pollen Morphology In Systematic Groupsmentioning

confidence: 99%

“…The purpose of the present palynological survey of Myrtaceae (Thornhill et al 2012a(Thornhill et al , 2012b(Thornhill et al , 2012c; the present paper) was to identify and document distinctive pollen types by investigating as many genera as possible by using SEM and LM. In total, we sampled 17 tribes, 114 genera and 499 species, which comprisẽ 75% of the genera and 10% of the species of Myrtaceae.…”

Section: A Summary Of Myrtaceae Palynologymentioning

confidence: 99%

Pollen morphology of the Myrtaceae. Part 4: tribes Kanieae, Myrteae and Tristanieae

et al. 2012

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Pollen morphology of 44 genera and 101 species from the Myrtaceae tribes Kanieae, Myrteae and Tristanieae was surveyed using scanning electron microscopy (SEM) and light microscopy (LM). Most Myrteae pollen were brevicolpate and granulate, which is unique within Myrtaceae, and these are most likely ancestral characters for this tribe. Two main pollen types were observed in tribe Kanieae, one form being with syncolpate colpi and a distinctive granulate exine, and the other with parasyncolpate colpi and a less ornamented exine. Genera Tristania and Thaleropia of tribe Tristanieae produce the smallest pollen in Myrtaceae, whereas Octamyrtus of tribe Myrteae produces the largest pollen observed in Myrtaceae.

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“…tribes) (Boyd 1992;Chalson and Martin 1995;Dodson 1974;Martin and Gadek 1985;Parnell 2003;Pickett and Newsome 1997;Pike 1956;and Thornhill 2010). The collective data of Thornhill (2012aThornhill ( , 2012bThornhill ( , 2012cThornhill ( , 2012d formed the most comprehensive material.…”

Section: Articlesmentioning

confidence: 99%

The palaeo-environmental history of Big Willum Swamp, Weipa: An environmental context for the archaeological record

Stevenson

Brockwell

Rowe³

et al. 2015

Australian Archaeology

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The environmental history of Big Willum (Waandriipayn) Swamp and the surrounding landscape is reconstructed for the last 8000 years through the analysis of pollen, charcoal and mineral magnetics. The data provide a Holocene record of vegetation and fire in an area where few records exist. Swamp initiation at Big Willum began prior to 8000 cal. BP, with swamp-like conditions maintained until 2200 cal. BP, after which it became a permanent deep water body, reaching its present day extent between 600-400 cal. BP. From 7000-1200 cal. BP the surrounding woodland was essentially stable. Fire is present throughout the record, with only one period of pronounced burning outside of the historic period, at around 1000 cal. BP, leading to a slightly more open understorey/woodland. The hydrological change at 2200 cal. BP that led to Big Willum becoming a more permanent water body overlaps with the end of the most intensive period of shell mound formation and the commencement of earth mound building at nearby Wathayn. This is suggestive that change in, or diversification of, mound types may in part be linked to environmental transformations in the late Holocene. One possibility is that greater water security allowed for increasing and more permanent exploitation of inland locations.

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Pollen morphology of the Myrtaceae. Part 3: tribes Chamelaucieae, Leptospermeae and Lindsayomyrteae

Cited by 18 publications

References 16 publications

A continuous morphological approach to study the evolution of pollen in a phylogenetic context: An example with the order Myrtales

A continuous morphological approach to study the evolution of pollen in a phylogenetic context: An example with the order Myrtales

Pollen morphology of the Myrtaceae. Part 4: tribes Kanieae, Myrteae and Tristanieae

The palaeo-environmental history of Big Willum Swamp, Weipa: An environmental context for the archaeological record

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