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Research on chydorid (Crustacea: Cladocera: Chydoridae) reproduction is scarce and very little is known about the dynamics of parthenogenetic (asexual) and gamogenetic (sexual) reproduction modes in these cyclical parthenogens. The paleolimnological approach has a lot to offer to this research since chydorid carapaces (indicative of asexual reproduction) and ephippia (indicative of sexual reproduction) are identifiable in lake sediments. In the current study, we examined historical changes in chydorid reproduction patterns in an Austrian Alpine lake with the objective to explore reproductive shifts under limnological variability and with the hypothesis that sexual reproduction intensifies under unfavourable environmental conditions. For this, we utilised subfossil remains from a sediment sequence covering the past ~300 years in a high Alpine lake, lake Oberer Landschitzsee. The results suggested that in-lake processes likely changed as a response to post-Little Ice Age (LIA) climate warming. Indeed, the benthic quality – indicated by the chironomidbased benthic quality index (BQI) – deteriorated, and the productivity – indicated by organic matter in the sediment – increased. The chydorid community exhibited dramatic shifts in the post-LIA section of the core, around 1850-1950 AD, when the two dominant species Alona (A.) affinis and A. quadrangularis were outcompeted by Acroperus harpae, Alonella excisa, and Chydorus (C.) sphaericus-type and their reproduction gradually shifted towards the dominance of sexual reproduction. The community shift and prevalence of sexual reproduction coincided with the period of unfavourable limnological conditions, evidenced by low BQI values and higher organic content. Therefore, we suggest that the intensified sexual reproduction was a local response to deteriorated benthic conditions and a vigorous adaptive mechanism to ensure successful diapause and genetic variability under environmental change. The results give reason to suggest that fossil chydorid assemblages and ephippia indicate the ecological quality of lake ecosystems and, thus, they can be used as additional proxies in future assessments of the lake ecological status. Nevalainen, Liisa, and Tomi Petteri Luoto. 2013. “Sedimentary Chydorid (Cladocera) Ephippia in Relation to Lake Ecological Quality in the Austrian Alps”. Journal of Limnology 72 (1):e5. https://doi.org/10.4081/jlimnol.2013.e5. More Citation Formats ACM ACS APA ABNT Chicago Harvard MLA Turabian Vancouver Download Citation Endnote/Zotero/Mendeley (RIS) BibTeX Downloads Download data is not yet available. Citations List of Cited By : Quantitative palaeotemperature estimates based on fossil chydorid ephippia: calibration and validation of a novel method for northern lakes Tomi P. Luoto, Liisa Nevalainen, Seija Kultti, Kaarina Sarmaja‐Korjonen Journal of Quaternary Science : 2015 Climate variability and lake ecosystem responses in western Scandinavia (Norway) during the last Millennium Izabela Zawiska, Tomi P. Luoto, Liisa Nevalainen, Wojciech Tylmann, Thomas C. Jensen, Milena Obremska, Michał Słowiński, Michał Woszczyk, Ann Kristin Schartau, Bjørn Walseng Palaeogeography, Palaeoclimatology, Palaeoecology : 2017 Morphological and molecular identification of first recorded Cladoceran organisms in the desert of Abu Dhabi, UAE Waleed Hamza, Gaber Ramadan, Mashael AlKaabi MOJ Ecology & Environmental Sciences : 2018 The Wiley Handbook of Contextual Behavioral Science Jean‐Louis Monestès Themes by Openjournaltheme.com authors FOR AUTHORS SUBMIT YOUR PAPER Guide for Authors Benefits for Authors How to write a scientific paper How to write a Review article Article Processing Charge Registering new species in ZooBank reviewers FOR REVIEWERS Benefits for Reviewers How to review Thanks to Reviewers links LINKS CNR-IRSA - Water Research Institute Associazione Italiana di Oceanologia e Limnologia International Society of Limnology EFFS - European Federation for Freshwater Sciences International Society for Microbial Ecology flyer JOURNAL FLYER Phytoplankton-zooplankton coupling in a cascade of hypertrophic fishponds 21 September 2023 Marija Radojičić et al. 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