Horizontal distribution of nematode communities in a seasonally-hypoxic enclosed sea (Omura Bay, Japan)

Nguyen, Quyen T. D.; Kim, Dongsung; Shimanaga, Motohiro; Uchida, Jun; Amemiya, Takashi; Wada, Mitsuru

doi:10.1007/s10872-020-00558-2

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…Through the evolution of specific mechanisms, such as symbiotic associations, nutrient uptake efficiency, or phosphorus storage strategies, these eukaryotic organisms have developed diverse survival strategies, contributing to an increase in β‐diversity (Eldridge et al., 2018). Furthermore, high soil nutrient stoichiometry has the potential for creating environmental heterogeneity to influence the P‐driven deterministic processes, thereby contributing to the formation of distinct niches for various organisms and fostering the biotic β‐diversity (Nguyen et al., 2020; Zhang et al., 2020). Phosphorus‐deficient environments usually have higher β‐diversity, fostering the survival of specialized species and offering unique functional potential (Souza et al., 2008).…”

Section: Discussionmentioning

confidence: 99%

Community assembly of organisms regulates soil microbial functional potential through dual mechanisms

Zhu,

Luan,

Chen

et al. 2024

Global Change Biology

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Unraveling the influence of community assembly processes on soil ecosystem functioning presents a major challenge in the field of theoretical ecology, as it has received limited attention. Here, we used a series of long‐term experiments spanning over 25 years to explore the assembly processes of bacterial, fungal, protist, and nematode communities using high‐throughput sequencing. We characterized the soil microbial functional potential by the abundance of microbial genes associated with carbon, nitrogen, phosphorus, and sulfur cycling using GeoChip‐based functional gene profiling, and determined how the assembly processes of organism groups regulate soil microbial functional potential through community diversity and network stability. Our results indicated that balanced fertilization (NPK) treatment improved the stochastic assembly of bacterial, fungal, and protist communities compared to phosphorus‐deficient fertilization (NK) treatment. However, there was a nonsignificant increase in the normalized stochasticity ratio of the nematode community in response to fertilization across sites. Our findings emphasized that soil environmental factors influenced the assembly processes of the biotic community, which regulated soil microbial functional potential through dual mechanisms. One mechanism indicated that the high phosphorus levels and low soil nutrient stoichiometry may increase the stochasticity of bacterial, fungal, and protist communities and the determinism of the nematode community under NPK treatment, ultimately enhancing soil microbial functional potential by reinforcing the network stability of the biotic community. The other mechanism indicated that the low phosphorus levels and high soil nutrient stoichiometry may increase the stochastic process of the bacterial community and the determinism of the fungal, protist, and nematode communities under NK treatment, thereby enhancing soil microbial functional potential by improving the β‐diversity of the biotic community. Taken together, these results provide valuable insights into the mechanisms underlying the assembly processes of the biotic community that regulate ecosystem functioning.

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Section: Discussionmentioning

confidence: 99%

Community assembly of organisms regulates soil microbial functional potential through dual mechanisms

Zhu,

Luan,

Chen

et al. 2024

Global Change Biology

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“…Among the metazoan meiofauna, nematodes, the most abundant metazoan meiofaunal taxa, usually prevail in suboxic or even sulfidic environments (Giere 2009). Recently, Nguyen et al (2018Nguyen et al ( , 2020 reported that the community composition of nematodes temporally shifted between normoxic and hypoxic conditions in Omura Bay. However, these temporal patterns were also affected by spatial heterogeneities in the degree of seasonal hypoxia and other environmental factors in the surface sediment of the bay.…”

Section: Introductionmentioning

confidence: 99%

Impact of seasonal hypoxia on benthic copepod communities in Omura Bay, a highly enclosed coastal sea in southwestern Japan

Kawano

Shimanaga

Ueda

et al. 2021

Plankton Benthos Res

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Declining oxygen concentrations in aquatic habitats represent extreme conditions that threaten benthic life. Hypoxia has recently become an important research topic, as areas affected by these phenomena are spreading globally. Omura Bay is one of the most highly enclosed seas in Japan, and severely hypoxic conditions occur at the bottom every summer. We conducted a preliminary study in the center of the bay to evaluate how seasonal hypoxia affects the abundance and community composition of benthic meiofauna, with particular reference to copepods. The copepod densities and their nauplii differed significantly among seasonal categories (before, during, and after hypoxia). Furthermore, the degree of the seasonal decline in copepods during hypoxia seemed much more severe than that in nematodes, the most abundant meiofauna. The assemblages of adult copepods had the simplest composition during hypoxia, when harpacticoid copepods in the family Cletodidae, which have smaller and slender bodies, occurred at significantly higher frequencies (a contribution of 84% to the mean similarity among seasons). After hypoxia, the relative abundance of copepods in the families Ectinosomatidae and Longipediidae increased, which may likely be attributed to their higher swimming abilities and rapid recruitment via specific planktonic nauplius stages, respectively. High frequencies of copepods in the Cletodidae family have also been observed under hypoxic conditions in the Mediterranean Sea, suggesting that similar processes affect benthic copepod communities, which work to the advantage of cletodid species with small and slender forms in the subtidal sediment bottom under severe hypoxia in Omura Bay and other regions.

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Horizontal distribution of nematode communities in a seasonally-hypoxic enclosed sea (Omura Bay, Japan)

Cited by 2 publications

References 22 publications

Community assembly of organisms regulates soil microbial functional potential through dual mechanisms

Community assembly of organisms regulates soil microbial functional potential through dual mechanisms

Impact of seasonal hypoxia on benthic copepod communities in Omura Bay, a highly enclosed coastal sea in southwestern Japan

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