Unexpected increases in rotifer resting egg abundances during the period of contamination of Lake Orta
Piscia, R., Tabozzi, S., Bettinetti, R., Nevalainen, L., & Manca, M. M. (2016). Unexpected increases in rotifer resting egg abundances during the period of contamination of Lake Orta. Journal of Limnology, 75(2s), 76-85. https://doi.org/10.4081/jlimnol.2016.1300
Julkaistu sarjassa
Journal of LimnologyTekijät
Päivämäärä
2016Tekijänoikeudet
© the Authors, 2016. This is an open access article published by PAGEPress and distributed under a Creative Commons Attribution NonCommercial 4.0 License.
Despite their ecological importance and rapid response to environmental changes, rotifers are rarely included in palaeolimnological
studies. Here, we describe changes in abundance (ABD) and morphotype (MTs) diversity of rotifer resting eggs in the sediments of deep
subalpine Lake Orta, Italy, covering a period prior to (pre-) 1926, during long-term ammonia and metal pollution from a rayon factory,
and subsequent recovery of water quality. Following the pollution and bacterial oxidation of the ammonia, Lake Orta became the largest
and deepest acid lake in Europe. Recovery of water quality followed both a ban on the discharge of industrial wastes, and a liming intervention
in 1989 and 1990. We sectioned a sediment core collected from the deepest part of the lake (ORTA 07/2A) to provide a high
time resolution, given the ca. 3-4 y cm–1 of sediment accumulation. Rotifer resting egg abundance and morphotypes were examined
from the sediments and compared to limnological variables indicating the pollution. Rotifer resting egg abundance significantly increased
with lake contamination (r=0.609 and -0.624 for copper and pH, respectively; P<0.001; n=27). A lake-water copper concentration
threshold of ca. 40 µg L–1discriminated among pre-, during-, and post- pollution compositions of the rotifer morphotype assemblages.
Diversity and morphotype richness increased during the recovery from copper pollution and with complete restoration from acidity,
while abundance increased during pollution. The persistence of presumably viable Brachionus resting eggs and of hatched egg cases
during the heavy pollution phase suggests that, unlike most other organisms, which were extirpated by the pollution of the lake, rotifers
survived producing resting eggs, which secured future generations.
...
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https://converis.jyu.fi/converis/portal/detail/Publication/25734086
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