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Establishment success of alien Daphnia in the ancient Lake Biwa: insights from sedimentary archives

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Abstract

Invasive species pose serious threats to global biodiversity, prompting studies to identify factors underlying invasion and establishment success. However, it's difficult to discern these factors due to the absence of survey data since the initial invasion, because introduced species often remain unnoticed until their population becomes large enough. Here, we investigated the establishment process of the alien zooplankton, Daphnia pulicaria, in the past 30 years using sedimentary archives at Lake Biwa. We performed genetic analysis on mitochondrial DNA sequences of the control region and ND5 gene of ephippia in sediments, as well as present females from water samples. Furthermore, we investigated the relationships between the abundance of D. pulicaria and its major predator fish, Ayu, based on the catch data, as well as its competitor, Daphnia galeata whose abundance was inferred from claw remains. Our analyses showed the studied mitochondrial sequences were identical between all samples. The abundance of D. pulicaria was not correlated with that of a competitor but was negatively with that of a predator. These findings suggest the successful establishment of D. pulicaria was primarily influenced by reduced predation pressure, with a limited impact from competitive interactions and potential hindrance for adaptation caused by loss of genetic variation.

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All data generated during this study are included in this published article.

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Acknowledgements

We are grateful to Y. Goda, T. Akatsuka, S. Yamamoto, M. Kuwae, M. Ochiai, and H. Iwata for their assistance with laboratory analysis and field sampling. This study was supported by Grants-in-Aid for Scientific Research (17K00528, 21K12273 to NT, and 21H03654 to KU) from the Japan Society for the Promotion of Science (JSPS) and also partly supported by a special research grant from Matsuyama University, the Academic Research Organization Joint Usage/Research Grants from Leading Academia in Marine and Environment Pollution Research (LaMer), Ehime University, and the Center for Ecological Research (2017–2021 jurc-cer), Kyoto University.

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N.T. and K.U conceived the idea and designed the study; N.T., I.H., K.N., M.N.H., and K.U. conducted sampling and the experiments; I.H., K.N., and K.U. contributed to the data analysis; K.U. contributed to primer design; N.T., I.H., and K.U. wrote the first draft of the manuscript; all authors revised and commented on the manuscript.

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Correspondence to Narumi Tsugeki or Kimiko Uchii.

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Tsugeki, N., Hashimoto, I., Nakane, K. et al. Establishment success of alien Daphnia in the ancient Lake Biwa: insights from sedimentary archives. Hydrobiologia 851, 3591–3602 (2024). https://doi.org/10.1007/s10750-024-05519-0

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  • DOI: https://doi.org/10.1007/s10750-024-05519-0

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