AN UNUSUAL TROPHIC SUBSIDY AND SPECIES DOMINANCE IN A TROPICAL STREAM

Ecology ◽  
2008 ◽  
Vol 89 (8) ◽  
pp. 2325-2334 ◽  
Author(s):  
Jill Lancaster ◽  
Michael Dobson ◽  
Adiel M. Magana ◽  
Amanda Arnold ◽  
Jude M. Mathooko
Keyword(s):  
Tropical Stream ◽  
Species Dominance ◽  
Trophic Subsidy

Monoculture-based consumer-resource models predict species dominance in mixed batch cultures of dinoflagellates

Harmful Algae ◽  
2020 ◽  
Vol 99 ◽  
pp. 101921
Author(s):  
M. De Rijcke ◽  
J.M. Baert ◽  
N. Brion ◽  
M.B. Vandegehuchte ◽  
F. De Laender ◽  
...  
Keyword(s):  
Batch Cultures ◽  
Species Dominance ◽  
Consumer Resource ◽  
Mixed Batch

Tree species dominance in neotropical savanna aboveground biomass and productivity

2021 ◽  
Vol 496 ◽  
pp. 119430
Author(s):  
Marcela de Castro Nunes Santos Terra ◽  
Jamir Afonso do Prado-Júnior ◽  
Cléber Rodrigo de Souza ◽  
Luiz Otávio Rodrigues Pinto ◽  
Eduarda Martiniano de Oliveira Silveira ◽  
...  
Keyword(s):  
Aboveground Biomass ◽  
Tree Species ◽  
Neotropical Savanna ◽  
Species Dominance

scholarly journals Cytokine profiles and Lactobacillus species presence in pre-menopausal subjects with genital Mycoplasma genitalium or Ureaplasma urealyticum colonization

2021 ◽  
Vol 17 ◽  
pp. 174550652110091
Author(s):  
John Garza ◽  
Kushal Gandhi ◽  
Sarah Choi ◽  
Asley Sanchez ◽  
Gary Ventolini
Keyword(s):  
Ureaplasma Urealyticum ◽  
Mycoplasma Genitalium ◽  
Interleukin 12 ◽  
Lactobacillus Species ◽  
Control Group ◽  
Study Group ◽  
Species Dominance ◽  
Cytokine Profiles ◽  
Menopausal Women ◽  
Significant Difference

Background and Purpose: Lactobacilli play a vital role in protecting the vagina against pathogens. Cytokines are vital components of defense against infections in women. The genital mycoplasmas, Mycoplasma genitalium and Ureaplasma urealyticum, are associated with various infectious diseases in adults and infants. The objective of our study is to identify differences in cytokine profile and Lactobacillus species dominance between a study group of non-pregnant pre-menopausal women with genital M. genitalium or U. urealyticum colonization and a control group of non-pregnant pre-menopausal women without genital M. genitalium or U. urealyticum colonization. Methods: A real-time polymerase chain reaction was performed to measure Lactobacillus species in vaginal swab samples. Cytokine analysis was performed using multiplex immunoassay techniques. Analysis of variance confirmed a significant difference in cytokine profiles between patient groups, with t-tests identifying the most significantly different cytokines. Categorical data analysis identified significant patterns of relative Lactobacillus species dominance in the study group. Results: Lactobacillus iners was the predominant Lactobacillus species in the control group ( p = 0.005). There were no dominant Lactobacillus species observed in the study group. Vascular endothelial growth factor A ( p = 0.002), interleukin-8 ( p = 0.001), and interleukin-1β ( p = 0.049) were expressed significantly higher in the study group, whereas interleukin-1 receptor antagonist ( p < 0.001), interleukin-10 ( p = 0.001), interleukin-12 ( p = 0.002), and interferon-γ ( p = 0.022) were expressed higher in the control group. Association matrices for cytokines were significantly different between two groups ( p < 0.001), with mostly negative associations in the control group and mostly positive associations in the study group. Conclusion: Cytokine levels, their associations, and the patterns of Lactobacillus species dominance are observed to significantly diverge on the basis of M. genitalium and U. urealyticum colonization among non-pregnant pre-menopausal women.

scholarly journals Saline mine-water alters the structure and function of prokaryote communities in shallow groundwater below a tropical stream

2021 ◽  
pp. 117318
Author(s):  
Lisa Chandler ◽  
Andrew J. Harford ◽  
Grant C. Hose ◽  
Chris L. Humphrey ◽  
Anthony Chariton ◽  
...  
Keyword(s):  
Mine Water ◽  
Shallow Groundwater ◽  
Structure And Function ◽  
Tropical Stream ◽  
And Function

scholarly journals Post-fire consequences for leaf breakdown in a tropical stream

2019 ◽  
Vol 31 ◽  
Author(s):  
Renan de Souza Rezende ◽  
Cristiano Queiroz de Albuquerque ◽  
Andrezza Sayuri Victoriano Hirota ◽  
Paulo Fernandes Roges Souza Silva ◽  
Ricardo Keichi Umetsu ◽  
...  
Keyword(s):  
Leaf Litter ◽  
Fungal Biomass ◽  
Mesh Size ◽  
Fire Effects ◽  
Dry Mass ◽  
Tropical Stream ◽  
Fire Event ◽  
Litter Bags ◽  
Fine Mesh ◽  
Post Fire Effects

Abstract Aim Wildfire is a natural pulsed disturbance in landscapes of the Savannah Biome. This study evaluates short-term post-fire effects on leaf litter breakdown, the invertebrate community and fungal biomass of litter from three different vegetal species in a tropical stream. Methods Senescent leaves of Inga laurina, Protium spruceanum and Rircheria grandis (2 ± 0.1 g dry mass) were individually placed in litter bags (30 × 30 cm: 10 mm coarse mesh and 0.5 mm fine mesh) and submerged in the study stream before and after fire. Replicate bags (n = 4; individually for each species, sampling time, fire event and mesh size) were then retrieved after 20 and 40 days and washed to separate the invertebrates before fire event and again immediately after fire. Disks were cut from leaves to determine ash-free dry mass, while the remaining material was oven-dried to determine dry mass. Results The pre-fire mean decomposition coefficient (k = -0.012 day-1) was intermediate compared to that reported for other savannah streams, but post-fire it was lower (k = -0.007 day-1), due to decreased allochthonous litter input and increased autochthones production. Intermediate k values for all qualities of litter post-fire may indicate that fire is equalizing litter quality in the stream ecosystem. The abundance of scrapers was found to be more important than fungal biomass or shredder abundance, probably due to their functioning in leaf fragmentation while consuming periphyton growing on leaf litter. Conclusions Theses results indicate that fire can modify the relationships within decomposer communities in tropical stream ecosystems.

Abundance of leafminers and leaf area loss by chewing herbivores in hybrids between Quercus crispula and Quercus dentata

2004 ◽  
Vol 34 (12) ◽  
pp. 2501-2507 ◽  
Author(s):  
Takahide A Ishida ◽  
Kouhei Hattori ◽  
Masahito T Kimura
Keyword(s):  
Leaf Area ◽  
Parental Species ◽  
Quercus Crispula ◽  
Species Dominance ◽  
Area Loss ◽  
Early Instar ◽  
Sap Feeding ◽  
Leaf Area Loss ◽  
Quercus Dentata ◽  
Northern Japan

We examined responses of phytophagous insects to hybrids between Quercus crispula Blume and Quercus dentata Thunberg in a natural population in northern Japan. The abundance of leafminers and leaf area loss by chewing insects in hybrids were intermediate between those in the parental species (additive mode), close to those of either of the parental species (dominance mode), or similar to those of both parental species (no difference). Hybrids were neither more susceptible nor resistant to the insect herbivores we monitored. In Phyllonorycter (Gracillariidae) species, which are specialized to either of the parental oak species, the mortality of sap-feeding early instar larvae did not differ between hybrids and the parental species. The abundance of four leafminer taxa was correlated with environmental conditions (i.e., distance from the coastal edge of the forest or the timing of budbreak) as well as genetic factors.

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