Distribution and characterization of nematodes in above-ground microhabitats on a natural pristine cedar forest in Yakushima Island, Japan

IF 1 4区 生物学 Q3 ZOOLOGY Canadian Journal of Zoology Pub Date : 2023-10-04 DOI:10.1139/cjz-2023-0107
Yudai Kitagami, Yosuke Matsuda
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Abstract

Nematode communities in natural pristine forests composed of trees aged over a thousand years have not been thoroughly studied. Old-growth forests can provide diverse microhabitats for nematodes such as fallen trees with mossy conditions. This study aimed to characterize the community and trophic compositions of nematodes in relation to different microhabitats in old-growth Japanese cedar (Cryptomeria japonica (Lf) D.Don) forests in Yakushima Island, Japan. To this aim, nematodes retrieved from four different types of microhabitats were morphologically identified at the family/genus level and divided into five trophic groups. A non-metric multidimensional scaling scatterplot showed that nematode communities clustered significantly in each microhabitat and their community compositions were significantly affected by C/N ratio. With respect to nematode trophic composition, bacterivorous nematodes dominated decaying barks of fallen trees, with a relative abundance of 45%, while fungivorous nematodes were dominant in living barks of cedar trunks (61%). Predatory-omnivorous nematodes predominated in mosses of fallen trees (51%). These results showed that nematode community and trophic composition were different among microhabitats characterized by nutrient conditions. The predatory-omnivorous nematodes were abundant in mosses with N-rich conditions. In contrast, fungivorous nematodes were abundant in cedar trunks with high C/N conditions. Thus, old-growth natural forests can provide diverse microhabitats where various nematode taxa coexist due to the presence of fallen trees and mosses.
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日本屋久岛天然原始杉林地上微生境线虫的分布与特征
在由千年以上树龄的树木组成的自然原始森林中,线虫群落尚未得到彻底研究。原始森林可以为线虫提供不同的微栖息地,如长满苔藓的倒下的树木。本研究旨在研究屋久岛日本杉木(Cryptomeria japonica (Lf) D.Don)原生林线虫群落和营养组成与不同微生境的关系。为此,从4种不同类型的微生境中提取的线虫在科/属水平上进行了形态学鉴定,并将其分为5个营养类群。非度量多维尺度散点图显示,线虫群落在各微生境中呈显著聚集,其群落组成受碳氮比的显著影响。从线虫的营养成分上看,腐树皮以菌性线虫为主,相对丰度为45%;雪松树干活树皮以真菌性线虫为主,相对丰度为61%。食食性-杂食性线虫在倒下树木的苔藓中占主导地位(51%)。结果表明,不同营养条件的微生境中线虫群落和营养组成存在差异。在富氮条件下,苔藓中有大量的捕食-杂食性线虫。在高碳氮比条件下,雪松树干中真菌线虫数量较多。因此,由于倒下的树木和苔藓的存在,原始天然林可以提供多种多样的微栖息地,在那里各种线虫类群共存。
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来源期刊
Canadian Journal of Zoology
Canadian Journal of Zoology 生物-动物学
CiteScore
2.40
自引率
0.00%
发文量
82
审稿时长
3 months
期刊介绍: Published since 1929, the Canadian Journal of Zoology is a monthly journal that reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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