Systematic Relationships within the Dasyurid Marsupial Tribe Sminthopsini—A Multigene Approach

Blacket, Mark J.; Krajewski, Carey; Labrinidis, Agatha; Cambron, Brian; Cooper, Steven J.; Westerman, Michael

doi:10.1006/mpev.1998.0604

Cited by 42 publications

(34 citation statements)

References 43 publications

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“…A cytb + 12s +PI survey of sminthopsine genera by Krajewski et al (1997a) found strong mtDNA support for tribal monophyly, but this was contradicted by Pl's placement of Antechinomys as sister to all other sminthopsines. Blacket et al (1999) expanded this study to include all sminthopsin species and duplicated the Antechinomys conflict. Thus, monophyly of sminthopsine tribes was somewhat uncertain, though P1 was clearly at odds with all other data sets on this point.…”

Section: Results F I M Cytochrome By 1 2 S Rrhla and Protamine Pi Anmentioning

confidence: 99%

“…Thus, monophyly of sminthopsine tribes was somewhat uncertain, though P1 was clearly at odds with all other data sets on this point. In an attempt to improve resolution among Sminthopsk species, Blacket et al (1999) supplemented the cytb + 12s + P1 data with partial sequences from the mitochondrial control region. These data placed Antechinomys as sister to Sminthopsk f Ningaui, but could not resolve a monophyletic Sminthopsis apart from Nngaui.…”

Section: Results F I M Cytochrome By 1 2 S Rrhla and Protamine Pi Anmentioning

confidence: 99%

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Molecular evidence for the pattern and timing of cladogenesis in dasyurid marsupials

Krajewski

Wroe

Westerman

2000

Zoological Journal of the Linnean Society

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Recent molecular studies have provided estimates of phylogeny for nearly all living and recently extinct species in the Order Dasyuromorphia, the dominant clade of insectivorouscarnivorous marsupials in Australasia. We review these studies along with morphology-based ones, and present an analysis of all cytochrome b, 12s rRNA, and protamine PI gene sequences available. In light of these results, we provide a revised suprageneric classification and assess the implications of molecular and paleontological data for dasyurid cladogenesis. Molecular results divide extant dasyurids (Dasyuridae) into four major clades apart from the numbat (Myrmecobiidae) and thylacines (Thylacinidae). We recognize these clades as tribes Dasyurini (Da~yurus, Phascolosorex, and allied genera) and Phascogalini (Antechinus, Murexia, Phascogale) in the Subfamily Dasyurinae, and tribes Sminthopsini (Sminthopsis, Mngaui, Antechinomy) and Planigalini (Planigale) in the Subfamily Sminthopsinae. Each tribe shows a basal radiation of lineages corresponding to genera or species groups. Our results concur with the most recent prrvious synthesis of dasyurid phylogeny in many respects, but subsumption of New Guinean 'phascolosoricines' and 'muricines' within Dasyurini and Phascogalini, respectively, constitute significant differences. In particular, the sister-pairing of 'phascolosoricines' with a Dasyurus-Sarcophilus clade implied by molecular data is difficult to reconcile with anatomy. Divergence rates of mitochondrial sequences are calibrated approximately by comparing thylacine-to-dasyurid distances with the age of the oldest thylacinid (Badjcinus, latest Oligocene). Estimated cladogenic dates suggest that extant subfamilies shared a common ancestor around 24 Mya and that major radiations began late in the mid-Miocene, consistent with the results of previous paleontological studies. The late-middle and late Miocene corresponds to an episode of faunal turnover in Australian marsupials (including the decline of thylacinid and handicoot genera, as well as the rise of dasyurids) and to a time when uplift of the New Guinean highlands accelerated the transition from rainforest to drier habitats. Our findings are consistent with the hypothesis that continent-wide climate changes modulated macroevolution across these independent marsupial clades. 0 1999 Tlir 1,iiiriraii Society 0 1 London ADDITIONAL KEY WORDS:--cytochrome b -12s rRNA -protamine PI -paleobiology.

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Section: Results F I M Cytochrome By 1 2 S Rrhla and Protamine Pi Anmentioning

confidence: 99%

Section: Results F I M Cytochrome By 1 2 S Rrhla and Protamine Pi Anmentioning

confidence: 99%

Molecular evidence for the pattern and timing of cladogenesis in dasyurid marsupials

Krajewski

Wroe

Westerman

2000

Zoological Journal of the Linnean Society

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“…To identify contrasts I constructed a composite species-level phylogeny of Australian mammals from published phylogenies (Watts & Aslin, 1981;Flannery, 1989;Watts et al, 1992;Strahan, 1995;Watts & Baverstock, 1995;Kirsch, Lapointe & Springer, 1997;Krajewski, Buckley & Westerman, 1997;Blacket et al, 1999). This is not an exhaustive list of phylogenetic studies of Australian mammals, but, in choosing studies, I favoured more recent and more comprehensive phylogenies, particularly those which synthesized results from several earlier studies.…”

Section: Independent Contrast Analysesmentioning

confidence: 98%

Biological determinants of extinction risk: why are smaller species less vulnerable?

Cardillo

2003

Animal Conservation

163

138

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It is becoming increasingly clear that species of smaller body size tend to be less vulnerable to contemporary extinction threats than larger species, but few studies have examined the mechanisms underlying this pattern. In this paper, data for the Australian terrestrial mammal fauna are used to ask whether higher reproductive output or smaller home ranges can explain the reduced extinction risk of smaller species. Extinct and endangered species do indeed have smaller litters and larger home ranges for their body size than expected under a null model. In multiple regressions, however, only litter size is a significant predictor of extinction risk once body size and phylogeny are controlled for. Larger litters contribute to fast population growth, and are probably part of the reason that smaller species are less extinction-prone. The effect of litter size varies between the mesic coastal regions and the arid interior of Australia, indicating that the environment a species inhabits mediates the effect of biology on extinction risk. These results suggest that predicting extinction risk from biological traits is likely to be a complex task which must consider explicitly interactions between biology and environment.

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“…Aside from S. macroura and S. crassicaudata (Godfrey, 1968;Morton, 1978;Geiser and Baudinette, 1985;Nagy et al, 1988;Frey, 1991;Holloway and Geiser, 1995;Song and Geiser, 1997;Song et al, 1998;Zosky, 2002;Zosky and O'Shea, 2003;Cooper et al, 2005), very few other sminthopsines have been studied in physiological terms. Sminthopsis macroura and S. ooldea also represent different lineages of the Sminthopsini (Blacket et al, 1999). If responses to the realised ecological niche of these taxa differ along phylogenetic lines, then other members of the S. psammophila species group (which includes S. ooldea) may be similarly thermally labile and as dependent upon torpor as S. ooldea, compared with members of the S. macroura species group (e.g.…”

Section: Ecophysiological and Evolutionary Interpretationsmentioning

confidence: 99%

“…Sminthopsis macroura (Gould 1845) and S. ooldea Troughton 1965 represent two distinct clades of dunnart, the S. macroura and S. psammophila species groups, respectively (Archer, 1981;Blacket et al, 1999). Sminthopsis macroura has an extensive geographical distribution across Australia (McKenzie et al, 2006), whereas S. ooldea is limited to the central Australian arid environments of Western Australia, South Australia and the Northern Territory (Aslin, 1983).…”

Section: Introductionmentioning

confidence: 99%

Flexibility in thermoregulatory physiology of two dunnarts, Sminthopsis macroura and Sminthopsis ooldea (Marsupialia; Dasyuridae)

Tomlinson

Withers

Maloney

2012

Journal of Experimental Biology

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SUMMARYStripe-faced dunnarts (Sminthopsis macroura) and Ooldea dunnarts (S. ooldea) were acclimated for 2weeks to ambient temperature (T a ) regimes of 12-22°C, 18-28°C and 25-35°C, and then measured for standard, basal (BMR) and maximum (MMR) metabolic rate using flow-through respirometry. Sminthopsis macroura maintained a stable body temperature under all experimental T a and acclimation regimes. Although its BMR was not statistically different between the three acclimation regimes, the lower end of the thermoneutral zone (TNZ) shifted from 30°C under the 18-28°C and 12-22°C acclimation regimes to 35°C under the 25-35°C acclimation regime. MMR increased significantly at the cooler acclimation regimes. EWL increased at T a 35°C, compared with lower T a , in all acclimation regimes, but an increase in evaporative water loss (EWL) at T a 10°C observed in cool acclimations did not occur at the 25-35°C regime. In contrast, S. ooldea had variable body temperature between experimental T a in all acclimation regimes, but no acclimational shift in TNZ, which was between 30 and 35°C. Neither BMR nor MMR was affected by exposure to the three acclimation regimes. EWL did not change across T a or with acclimation regime. Sminthopsis macroura was flexible in many aspects of its thermoregulation (involving energy and water balance) in response to thermal acclimation, presumably allowing it to balance its energy and water requirements over a broad range of climatic conditions. Sminthopsis ooldea seems to have an inflexible energetic and water balance in response to thermal acclimation, but has low nominal expenditure of either resource on thermoregulation because it thermoregulates less precisely than S. macroura. It seems that S. ooldea is adapted to a more narrow, stable climate.

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Systematic Relationships within the Dasyurid Marsupial Tribe Sminthopsini—A Multigene Approach

Cited by 42 publications

References 43 publications

Molecular evidence for the pattern and timing of cladogenesis in dasyurid marsupials

Molecular evidence for the pattern and timing of cladogenesis in dasyurid marsupials

Biological determinants of extinction risk: why are smaller species less vulnerable?

Flexibility in thermoregulatory physiology of two dunnarts, Sminthopsis macroura and Sminthopsis ooldea (Marsupialia; Dasyuridae)

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