A Global Overview of Dictyostelid Ecology with Special Emphasis in North American Forest

Cavender, James C.

doi:10.1007/978-3-642-38487-5_8

Cited by 6 publications

(3 citation statements)

References 54 publications

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“…Dictyostelids are abundant in temperate woodland soils but they have also been identified in diverse habitats that include caves, agricultural land, prairies, marshes, sandy mesas, tundra, and tropical forest (e.g., Cavender 1973, 2013; Cavender et al 2002; Landolt et al 2008; Romeralo et al 2010, 2011b; Swanson et al 2001, 2002; Vadell et al 2011). In most cases they are found in association with decaying leaves and organic waste (solid surfaces).…”

Section: Introductionmentioning

confidence: 99%

Multiple Dictyostelid Species Destroy Biofilms of Klebsiella oxytoca and Other Gram Negative Species

Sanders

Borys

Kisa

et al. 2017

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Dictyostelids are free-living phagocytes that feed on bacteria in diverse habitats. When bacterial prey is in short supply or depleted, they undergo multicellular development culminating in the formation of dormant spores. In this work, we tested isolates representing four dictyostelid species from two genera (Dictyostelium and Polysphondylium) for the potential to feed on biofilms preformed on glass and polycarbonate surfaces. The abilities of dictyostelids were monitored for three hallmarks of activity: 1) spore germination on biofilms, 2) predation on biofilm enmeshed bacteria by phagocytic cells and 3) characteristic stages of multicellular development (streaming and fructification). We found that all dictyostelid isolates tested could feed on biofilm enmeshed bacteria produced by human and plant pathogens: Klebsiella oxytoca, Pseudomonas aeruginosa, Pseudomonas syringae, Erwinia amylovora 1189 (biofilm former) and E. amylovora 1189 Δams (biofilm deficient mutant). However, when dictyostelids were fed planktonic E. amylovora Δams the bacterial cells exhibited an increased susceptibility to predation by one of the two dictyostelid strains they were tested against. Taken together, the qualitative and quantitative data presented here suggest that dictyostelids have preferences in bacterial prey which affects their efficiency of feeding on bacterial biofilms.

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Section: Introductionmentioning

confidence: 99%

Multiple Dictyostelid Species Destroy Biofilms of Klebsiella oxytoca and Other Gram Negative Species

Sanders

Borys

Kisa

et al. 2017

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“…The broad distributions may also be due to variation within the species. The presence of ecotypes of D. discoideum differing in temperature tolerance has been suggested [44]. However, independent isolates assigned to the same species but significantly differing in thermal characteristics may differ at the species level.…”

Section: Thermal Characteristics and Habitat Temperaturementioning

confidence: 99%

Influence of temperature on growth and development of dictyostelid slime moulds and its implication on the evolution of cold-tolerance

Hashimura

Inouye

2022

Preprint

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Environmental temperature is a major determinant of microbial life. Dictyostelids are soil amoebae capable of multicellular social behaviour upon starvation. They inhabit in a variety of environments from the tundra to the tropics, but how they have adapted to environmental temperature remains largely unknown. In this study, the effects of temperature on the growth and multicellular development of 36 dictyostelid species (58 strains/isolates) were examined. More than half of the species showed maximal growth and normal development at 28℃ or above, whereas some could grow and develop at 4℃, or even at 0℃. Many of the isolates examined were from areas with temperatures far lower than their preferred range over a large part of the year. There was a significant correlation between thermal characteristics and phylogeny. Over 150 known dictyostelid species are divided into several taxonomic groups. Our phylogenetic analysis indicated that cold-tolerance evolved independently in major clades, most prominently in group 4 (genus Dictyostelium according to the new classification by Sheikh et al.), which contains many species that are often found in subarctic regions. These results suggest that ancestors that have acquired cold-tolerance expanded their ranges into cooler areas where they could proliferate and develop during summer and survive the severe winter.

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“…Unidentified fruiting bodies are transferred to two-membered culture with Escherichia coli and further study of morphological features eventually leads to a species-level diagnosis. Although global knowledge of dictyostelid diversity is still relatively limited, we do know a great deal about their global distribution [6]. Progress has been made so that the number of species described has more than doubled since the printing of Raper’s monograph [2] and has been sufficient for phylogenetic studies to form a new taxonomy based on molecular as well as morphological techniques.…”

Section: Introductionmentioning

confidence: 99%

Five new species of dictyostelid social amoebae (Amoebozoa) from Thailand

et al. 2018

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BackgroundDictyostelid cellular slime molds (dictyostelids) are common inhabitants of the soil and leaf litter layer of fields and forests, along with animal dung, where they feed mostly on bacteria. However, reports on the species diversity of dictyostelids in South Asia, particularly Thailand, are limited. The research reported in this paper was carried out to increase our knowledge of the species diversity of this group of organisms in northern Thailand.ResultsForty soil samples were collected at four localities in northern Thailand to assess the species richness of dictyostelids. These samples yielded five dictyostelid isolates that were not morphologically consistent with any described species. Based on molecular signatures, all five of these isolates were assigned to the family Cavenderiaceae, genus Cavenderia. All five share a number of morphological similarities with other known species from this family. The new taxa differ from previously described species primarily in the size and complexity of their fruiting bodies (sorocarps). This paper describes these new species (Cavenderia aureostabilis, C. bhumiboliana, C. protodigitata, C. pseudoaureostipes, and C. subdiscoidea) based on a combination of morphological characteristics and their phylogenetic positions.ConclusionsAt least 15 taxa of dictyostelids were obtained from the four localities in northern Thailand, which indicates the high level of species diversity in this region. Five species were found to be new to science. These belong to the family Cavenderiaceae, genus Cavenderia, and were described based on both morphology and phylogeny.

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A Global Overview of Dictyostelid Ecology with Special Emphasis in North American Forest

Cited by 6 publications

References 54 publications

Multiple Dictyostelid Species Destroy Biofilms of Klebsiella oxytoca and Other Gram Negative Species

Multiple Dictyostelid Species Destroy Biofilms of Klebsiella oxytoca and Other Gram Negative Species

Influence of temperature on growth and development of dictyostelid slime moulds and its implication on the evolution of cold-tolerance

Five new species of dictyostelid social amoebae (Amoebozoa) from Thailand

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