Symbiotic causal network of seagrass-bacteria-algae-diatoms interactions

Hirokuni Miyamoto; Kenta Suzuki; Shigeharu Moriya; Makiko Matsuura; Naoko Tsuji; Teruno Nakaguma; Chitose Ishii; Takayuki Nagatsuka; Takashi Satoh; Wataru Suda; Tamotsu Kato; Chie Shindo; Atsushi Kurotani; Hiroaki Kodama; Hiroshi Masuya; Satoshi Wada; Nobuhiro Kawachi; Hisashi Miyamoto; Yukinari Tsuruda; Yohei Shimasaki; Shouzo Ogizo; Nobuo Suzuki; Tomoharu Yuge; Toshio Takahashi; Tomohito Ojima; Toshio Furota; Akio Sakamoto; Keiichi Takimoto; Kozo Kugimiya; Takehiro Tanaka; Takashi Kimura; Yuuji Oshima; Jun Kikuchi; Hiroshi Ohno

arXiv · 2511.13799

Symbiotic causal network of seagrass-bacteria-algae-diatoms interactions

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Abstract

Seagrass meadows contribute to the conservation of marine ecosystems, reduction in global warming impacts and pathogen controls. However, the decline in seagrass habitats due to environmental loads has become an urgent global issue. One way to address this issue is to better understand healthy seagrass habitats. Here, we estimate the structural characteristics of symbiotic and metabolic systems in sediments from eight coastal regions of Japan, with each region containing both seagrass-covered areas and adjacent unvegetated areas. Notably, seagrasses commonly maintain a balanced symbiotic relationship characterized by a positive association with cable bacteria (Desulfobulbaceae), nitrogen-cycling bacteria (Hyphomonadaceae), and coral algae (Corallinophycidae) and a negative association with diatoms (Diatomea). Furthermore, seagrass growth conditions influence metabolic pathways by activating nitrogen-related metabolism while attenuating methanogenesis. Our findings highlight the crucial roles of marine plants and their symbiotic systems in ensuring environmental conservation within the context of blue carbon storage across environmental gradients.

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Hirokuni Miyamoto, Kenta Suzuki, Shigeharu Moriya, Makiko Matsuura, Naoko Tsuji, Teruno Nakaguma, Chitose Ishii, Takayuki Nagatsuka, Takashi Satoh, Wataru Suda, Tamotsu Kato, Chie Shindo, Atsushi Kurotani, Hiroaki Kodama, Hiroshi Masuya, Satoshi Wada, Nobuhiro Kawachi, Hisashi Miyamoto, Yukinari Tsuruda, Yohei Shimasaki, Shouzo Ogizo, Nobuo Suzuki, Tomoharu Yuge, Toshio Takahashi, Tomohito Ojima, Toshio Furota, Akio Sakamoto, Keiichi Takimoto, Kozo Kugimiya, Takehiro Tanaka, Takashi Kimura, Yuuji Oshima, Jun Kikuchi, Hiroshi Ohno. 2025-11-17. Symbiotic causal network of seagrass-bacteria-algae-diatoms interactions. https://arxiv.org/abs/2511.13799

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