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Patterns of relative magnitudes of soil energy channels and their relationships with environmental factors in different ecosystems in Romania.

Ciobanu M, Popovici I, Zhao J, Stoica IA - Sci Rep (2015)

Bottom Line: The relevance of herbivore energy channel increased with soil depth due to higher contribution of root-feeders.Ectoparasites, sedentary parasites and epidermal cell and root hair feeders were the most important contributors to the total biomass and metabolic footprints of herbivores.The influence of altitude and climatic factors on percentages of abundance, biomass and metabolic footprints of herbivores, bacterivores and fungivores decreased with soil depth, whereas the influence of humus content, cation-exchange capacity and base saturation increased.

View Article: PubMed Central - PubMed

Affiliation: Institute of Biological Research, Branch of the National Institute of Research and Development for Biological Sciences, 48 Republicii Street, 400015 Cluj-Napoca, Romania.

ABSTRACT
The percentage compositions of soil herbivorous, bacterivorous and fungivorous nematodes in forests, grasslands and scrubs in Romania was analysed. Percentages of nematode abundance, biomass and metabolic footprint methods were used to evaluate the patterns and relative size of herbivory, bacterial- and fungal-mediated channels in organic and mineral soil horizons. Patterns and magnitudes of herbivore, bacterivore and fungivore energy pathways differed for a given ecosystem type and soil depth according to the method used. The relevance of herbivore energy channel increased with soil depth due to higher contribution of root-feeders. Ectoparasites, sedentary parasites and epidermal cell and root hair feeders were the most important contributors to the total biomass and metabolic footprints of herbivores. Metabolic footprint method revealed the general dominance of bacterial-based energy channel in all five types of ecosystems. The influence of altitude and climatic factors on percentages of abundance, biomass and metabolic footprints of herbivores, bacterivores and fungivores decreased with soil depth, whereas the influence of humus content, cation-exchange capacity and base saturation increased. Vegetation, altitude, climate and soil physico-chemical characteristics are important factors that influenced the abundance, biomass and metabolic footprints of herbivores, bacterivores and fungivores.

No MeSH data available.


Related in: MedlinePlus

The percentages of abundance (A–C), biomass (D–F), and metabolic footprint (G–I) of the bacterivorous, fungivorous and herbivorous nematodes in organic horizon and 0–5 cm and 5–10 cm layers of mineral horizon of coniferous forest, deciduous forest, mixed forest, grassland, and scrub ecosystems in Romania. Bars represent means ± standard error. In each ecosystem, different uppercase letters indicate significant (P < 0.05) differences among the three nematode trophic groups. For each nematode trophic group, different lowercase letters indicate significant (P < 0.05) differences among ecosystem types. The total number of samples in each soil horizon and ecosystem type are given in Table 2.
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f1: The percentages of abundance (A–C), biomass (D–F), and metabolic footprint (G–I) of the bacterivorous, fungivorous and herbivorous nematodes in organic horizon and 0–5 cm and 5–10 cm layers of mineral horizon of coniferous forest, deciduous forest, mixed forest, grassland, and scrub ecosystems in Romania. Bars represent means ± standard error. In each ecosystem, different uppercase letters indicate significant (P < 0.05) differences among the three nematode trophic groups. For each nematode trophic group, different lowercase letters indicate significant (P < 0.05) differences among ecosystem types. The total number of samples in each soil horizon and ecosystem type are given in Table 2.

Mentions: The order of the percentage of nematode abundances was herbivore > bacterivore > fungivore in organic horizon of coniferous forests and scrubs and bacterivore > herbivore > fungivore in deciduous and mixed forests and grasslands (Fig. 1A). The contribution of bacterivores and herbivores was significantly higher than that of fungivores in organic horizon in both grasslands and scrubs. In addition, herbivores were significantly more abundant in coniferous forests than in deciduous forests, mixed forests and grasslands. The percentage of fungivores was significantly higher in deciduous forests than in grasslands and scrubs. The percentage of bacterivores was significantly higher in deciduous and mixed forests, grasslands and scrubs than in coniferous forests.


Patterns of relative magnitudes of soil energy channels and their relationships with environmental factors in different ecosystems in Romania.

Ciobanu M, Popovici I, Zhao J, Stoica IA - Sci Rep (2015)

The percentages of abundance (A–C), biomass (D–F), and metabolic footprint (G–I) of the bacterivorous, fungivorous and herbivorous nematodes in organic horizon and 0–5 cm and 5–10 cm layers of mineral horizon of coniferous forest, deciduous forest, mixed forest, grassland, and scrub ecosystems in Romania. Bars represent means ± standard error. In each ecosystem, different uppercase letters indicate significant (P < 0.05) differences among the three nematode trophic groups. For each nematode trophic group, different lowercase letters indicate significant (P < 0.05) differences among ecosystem types. The total number of samples in each soil horizon and ecosystem type are given in Table 2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4664958&req=5

f1: The percentages of abundance (A–C), biomass (D–F), and metabolic footprint (G–I) of the bacterivorous, fungivorous and herbivorous nematodes in organic horizon and 0–5 cm and 5–10 cm layers of mineral horizon of coniferous forest, deciduous forest, mixed forest, grassland, and scrub ecosystems in Romania. Bars represent means ± standard error. In each ecosystem, different uppercase letters indicate significant (P < 0.05) differences among the three nematode trophic groups. For each nematode trophic group, different lowercase letters indicate significant (P < 0.05) differences among ecosystem types. The total number of samples in each soil horizon and ecosystem type are given in Table 2.
Mentions: The order of the percentage of nematode abundances was herbivore > bacterivore > fungivore in organic horizon of coniferous forests and scrubs and bacterivore > herbivore > fungivore in deciduous and mixed forests and grasslands (Fig. 1A). The contribution of bacterivores and herbivores was significantly higher than that of fungivores in organic horizon in both grasslands and scrubs. In addition, herbivores were significantly more abundant in coniferous forests than in deciduous forests, mixed forests and grasslands. The percentage of fungivores was significantly higher in deciduous forests than in grasslands and scrubs. The percentage of bacterivores was significantly higher in deciduous and mixed forests, grasslands and scrubs than in coniferous forests.

Bottom Line: The relevance of herbivore energy channel increased with soil depth due to higher contribution of root-feeders.Ectoparasites, sedentary parasites and epidermal cell and root hair feeders were the most important contributors to the total biomass and metabolic footprints of herbivores.The influence of altitude and climatic factors on percentages of abundance, biomass and metabolic footprints of herbivores, bacterivores and fungivores decreased with soil depth, whereas the influence of humus content, cation-exchange capacity and base saturation increased.

View Article: PubMed Central - PubMed

Affiliation: Institute of Biological Research, Branch of the National Institute of Research and Development for Biological Sciences, 48 Republicii Street, 400015 Cluj-Napoca, Romania.

ABSTRACT
The percentage compositions of soil herbivorous, bacterivorous and fungivorous nematodes in forests, grasslands and scrubs in Romania was analysed. Percentages of nematode abundance, biomass and metabolic footprint methods were used to evaluate the patterns and relative size of herbivory, bacterial- and fungal-mediated channels in organic and mineral soil horizons. Patterns and magnitudes of herbivore, bacterivore and fungivore energy pathways differed for a given ecosystem type and soil depth according to the method used. The relevance of herbivore energy channel increased with soil depth due to higher contribution of root-feeders. Ectoparasites, sedentary parasites and epidermal cell and root hair feeders were the most important contributors to the total biomass and metabolic footprints of herbivores. Metabolic footprint method revealed the general dominance of bacterial-based energy channel in all five types of ecosystems. The influence of altitude and climatic factors on percentages of abundance, biomass and metabolic footprints of herbivores, bacterivores and fungivores decreased with soil depth, whereas the influence of humus content, cation-exchange capacity and base saturation increased. Vegetation, altitude, climate and soil physico-chemical characteristics are important factors that influenced the abundance, biomass and metabolic footprints of herbivores, bacterivores and fungivores.

No MeSH data available.


Related in: MedlinePlus