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Open AccessArticle

Changes in Planktivory and Herbivory Regimes in a Shallow South American Lake (Lake Blanca Chica, Argentina) Over the Last 250 Years

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Departamento de Biología, Universidad Nacional de Mar del Plata, J. B. Justo 2550, Mar del Plata 7600, Argentina
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National Research Council (CNR),WaterResearchInstitute (IRSA), Largo Tonolli50, 28922 Verbania, Italia
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Instituto de Ecorregiones Andinas (INECOA, CONICET-UNJu), Instituto de Geología y Minería, Universidad Nacional de Jujuy, Av. Bolivia 1661, San Salvador de Jujuy Y4600GNE, Argentina
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Instituto de Investigaciones Marinas y Costeras (IIMYC), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, CONICET, J. B. Justo 2550, Mar del Plata 7600, Argentina
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Author to whom correspondence should be addressed.
Water 2020, 12(2), 597; https://doi.org/10.3390/w12020597
Received: 24 December 2019 / Revised: 17 February 2020 / Accepted: 18 February 2020 / Published: 22 February 2020
Shallow lakes are vulnerable ecosystems impacted by human activities and climate change. The Cladocera occupy a central role in food webs and are an excellent paleoecological indicator of food web structure and trophic status. We conducted a paleolimnological study in Lake Blanca Chica (Argentina) to detect changes on the planktivory and herbivory regimes over the last 250 years. Generalized additive models were fitted to the time series of fish predation indicators (ephippial abundance and size, mucrone size, fish scales, and the planktivory index) and pheophorbide a concentration. The cladoceran assemblage changed from littoral-benthic to pelagic species dominance and zooplankton switched from large-bodied (Daphnia) to small-bodied grazers (Bosmina) ca. 1900 due to increased predation. The shift in planktivory regime (ca. 1920–1930), indicated by fish scales and the planktivory index, as well as herbivory (ca. 1920–1950), was triggered by eutrophication. Changes in planktivory affected the size structure of Bosmina, reducing its body size. This study describes the baseline for the lake as well as the profound changes in the composition and size structure of the zooplankton community due to increased predation and the shift in the planktivory regime. These findings will provide a reference status for future management strategies of this ecosystem. View Full-Text
Keywords: Daphnia; Bosmina; pheophorbide a; fish predation; grazing; ephippia; cladocera sub-fossil remains Daphnia; Bosmina; pheophorbide a; fish predation; grazing; ephippia; cladocera sub-fossil remains
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MDPI and ACS Style

Carrozzo, D.; Musazzi, S.; Lami, A.; Córdoba, F.E.; González Sagrario, M.Á. Changes in Planktivory and Herbivory Regimes in a Shallow South American Lake (Lake Blanca Chica, Argentina) Over the Last 250 Years. Water 2020, 12, 597.

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