LIFE CYCLE-ASSOCIATED CHARACTER VARIATION IN<i>AULACOSEIRA KRAMMERI</i>SP. NOV., A NEW MIOCENE SPECIES FROM OREGON, U.S.A.

Edgar, Robert K.; Kociolek, John Patrick; Edgar, Stacy M.

doi:10.1080/0269249x.2004.9705605

Cited by 15 publications

(13 citation statements)

References 16 publications

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“…We also explored the use of morphometric analysis to define diatom populations, specifically using the heights and diameters of Aulacoseira valves. Aulacoseira valves differ in height and width depending on the stage in their life cycle (Edgar et al 2004), lake nutrients (Turkia and Lepistö 1999), and the species and varieties present (Krammer and Lange-Bertalot 1991;Spaulding et al 2010). We chose Aulacoseira for morphometric analysis in the Oruanui and other TVZ tephras and sediments because its remains are both abundant and relatively well preserved in these samples (Table 2).…”

Section: Methodsmentioning

confidence: 99%

“…There were too few Aulacoseira valves in the paleosol and 1.8 ka Taupo-Rotongaio tephra for population analysis. We used similar statistical techniques to those of Edgar et al (2004) to compare Aulacoseira populations. Visual inspection of scatter plots of height versus width suggested that their distributions were approximately normal, although outliers were sometimes seen.…”

Section: Methodsmentioning

confidence: 99%

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Eruptive and environmental processes recorded by diatoms in volcanically dispersed lake sediments from the Taupo Volcanic Zone, New Zealand

et al. 2015

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Late Pleistocene diatomaceous sediment was widely dispersed along with volcanic ash (tephra) across and beyond New Zealand by the 25.4 ka Oruanui supereruption from Taupo volcano. We present a detailed analysis of the diatom populations in the Oruanui tephra and the newly discovered floras in two other eruptions from the same volcano: the 28.6 ka Okaia and 1.8 ka Taupo eruptions. For comparison, the diatoms were also examined in Late Pleistocene and Holocene lake sediments from the Taupo Volcanic Zone (TVZ). Our study demonstrates how these microfossils provide insights into the lake history of the TVZ since the Last Glacial Maximum.Morphometric analysis of Aulacoseira valve dimensions provides a useful quantitative tool to distinguish environmental and eruptive processes within and between individual tephras. The Oruanui and Okaia diatom species and valve dimensions are highly consistent with a shared volcanic source, paleolake and eruption style (involving large-scale magmawater interaction). They are distinct from lacustrine sediments sourced elsewhere in the TVZ. Correspondence analysis shows that small, intact samples of erupted lake sediment (i.e., lithic clasts in ignimbrite) contain heterogeneous diatom populations, reflecting local variability in species composition of the paleolake and its shallowly buried sediments. Our analysis also shows a dramatic post-Oruanui supereruption decline in Cyclostephanos novaezelandiae, which likely reflects a combination of (1) reorganisation of the watershed in the aftermath of the eruption, and (2) overall climate warming following the Last Glacial Maximum. This decline is reflected in substantially lower proportions of C. novaezelandiae in the 1.8 ka Taupo eruption deposits, and even fewer in post-1.8 ka sediments from modern (Holocene) Lake Taupo. Our analysis highlights how the excellent preservation of siliceous microfossils in volcanic tephra may fingerprint the volcanic source region and retain a valuable record of volcanically influenced environmental change.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Eruptive and environmental processes recorded by diatoms in volcanically dispersed lake sediments from the Taupo Volcanic Zone, New Zealand

et al. 2015

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“…and so they differ in this character from A. hibschii presented in this paper, where the rimoportulae have never been found on the ringleist. Similarly A. hibschii differs in this character from A. paucistriata Bradbury, A. solida (Eulenstein in Van Heurck) Krammer and A. krammeri Edgar, R.K., Kociolek & Edgar, S.M., which also have their rimoportular canals inside the ringleist (Bradbury 1991, Edgar et al 2004. A. distans (Ehrenberg) Simonsen also has a sparse ring of the rimoportulae located in near the ringleist (Crawford & Likhoshway 1999), but it differs from the larger, coarsely areolated A. hibschii in other characters.…”

Section: Discussionmentioning

confidence: 99%

“…The terms distal and proximal are used in the sense of Edgar et al (2004), which means that the collum is the proximal part of the valve mantle, while the valve face is the distal part of the valve.…”

Section: Václav Houk Aulacoseira Hibschii (Centrales) From the Type Lmentioning

confidence: 99%

Aulacoseira hibschii (Reichelt) Houk comb. nov. (Bacillariophyceae, Centrales) from the type locality in Varnsdorf (Czech Republic)

Houk¹

2007

Bull. Geosci.

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Aulacoseira hibschii (Reichelt) Houk comb. nov. (Bacillariophyceae, Centrales) from the type locality in Varnsdorf (Czech Republic) VÁCLAV HOUKValve morphology and ultrastructure of Melosira hibschii Reichelt, from raw material E 1821 "Warnsdorf, braune Schicht, leg. Reichelt" and slide A2/81 labelled "Melosira Hibschii Reich." from the Hustedt Diatom Collection, Bremerhaven, and slide B 1731 "Warnsdorf Böhmen (Elger 118)" from the Weinzierl Collection, Botanisches Staatsammlung München (Germany), were investigated using light and scanning electron microscopy to clarify the taxonomic position of this species, which is considered to belong to the genus Aulacoseira Thwaites. A formal transfer to this genus as Aulacoseira hibschii (Reichelt) Houk comb. nov. is proposed. A. hibschii differs from related Aulacoseira taxa by the characteristic location of the rimoportulae combined with the coarse areolar valve pattern and with the characteristic shape of the two types of spines. The rimoportulae are spaced in a sparse ring near the ringleist, or again sparsely near to the middle of the valve mantle, or they are situated irregularly. The species was then identified from several other Paleogene diatomites from northern Bohemia and Seifhennersdorf (Germany). The observed valve morphology and ultrastructure of A. hibschii are discussed and compared with those of related species.•

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“…These characters did not vary within species, supporting the previous suggestion of Likhoshway and Crawford (2001). Terms used for qualitative characters, such as ringleist, collum, and pseudosulcus, follow Krammer (1991a,b), Krammer and Lange‐Bertalot (1991), Crawford and Likhoshway (1999, 2002), Likhoshway and Crawford (2001), Crawford et al (2003), and Edgar et al (2004).…”

mentioning

confidence: 99%

PHYLOGENY OF AULACOSEIRA (BACILLARIOPHYTA) BASED ON MOLECULES AND MORPHOLOGY¹

Edgar

Theriot²

2004

Journal of Phycology

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The phylogeny of 67 populations representing 45 species of Aulacoseira Thwaites was estimated by maximum parsimony methods using a combination of nucleotide sequence data and qualitative and quantitative morphological characteristics of the silica cell wall gathered primarily from original observation by LM and SEM. A new type of character using continuous quantitative variables that describe the ontogenetic-allometric trajectories of cell wall characteristics over the life cycle (size range) of diatoms is introduced. In addition to the 45 Aulacoseira species, the phylogeny also incorporated one Miosira Krammer, Lange-Bertalot, and Schiller species and two outgroup species (Melosira varians Agardh and Stephanopyxis nipponica Gran & Yendo). Fifteen species, represented by 24 populations, also contained molecular data from the nuclear genome (18S rDNA), and 11 of these species (18 populations) contained data from the chloroplast genome (rbcL) as well, which were sequenced or downloaded from GenBank. The phylogeny of Aulacoseira is composed of five major clades: 1) an A. crenulata (Ehrenburg) Thwaites and A. italica (Ehrenburg) Simonsen clade, which is the most basal; 2) an A. granulata (Ehrenburg) Simonsen complex clade; 3) an A. ambigua (Grunow) Simonsen clade; 4) an A. subarctica (O. Müller) Haworth and A. distans (Ehrenburg) Simonsen clade; and 5) an A. islandica (O. Müller) Simonsen clade that also contained endemic species from Lake Baikal, Siberia and many extinct Aulacoseira taxa. Monophyly of Aulacoseira can only be achieved if Miosira is no longer given separate generic status.

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LIFE CYCLE-ASSOCIATED CHARACTER VARIATION INAULACOSEIRA KRAMMERISP. NOV., A NEW MIOCENE SPECIES FROM OREGON, U.S.A.

Cited by 15 publications

References 16 publications

Eruptive and environmental processes recorded by diatoms in volcanically dispersed lake sediments from the Taupo Volcanic Zone, New Zealand

Eruptive and environmental processes recorded by diatoms in volcanically dispersed lake sediments from the Taupo Volcanic Zone, New Zealand

Aulacoseira hibschii (Reichelt) Houk comb. nov. (Bacillariophyceae, Centrales) from the type locality in Varnsdorf (Czech Republic)

PHYLOGENY OF AULACOSEIRA (BACILLARIOPHYTA) BASED ON MOLECULES AND MORPHOLOGY¹

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LIFE CYCLE-ASSOCIATED CHARACTER VARIATION INAULACOSEIRA KRAMMERISP. NOV., A NEW MIOCENE SPECIES FROM OREGON, U.S.A.

Cited by 15 publications

References 16 publications

Eruptive and environmental processes recorded by diatoms in volcanically dispersed lake sediments from the Taupo Volcanic Zone, New Zealand

Eruptive and environmental processes recorded by diatoms in volcanically dispersed lake sediments from the Taupo Volcanic Zone, New Zealand

Aulacoseira hibschii (Reichelt) Houk comb. nov. (Bacillariophyceae, Centrales) from the type locality in Varnsdorf (Czech Republic)

PHYLOGENY OF AULACOSEIRA (BACILLARIOPHYTA) BASED ON MOLECULES AND MORPHOLOGY1

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PHYLOGENY OF AULACOSEIRA (BACILLARIOPHYTA) BASED ON MOLECULES AND MORPHOLOGY¹