A Non-Stressful Temperature Rise and Greater Food Availability Could Increase Tolerance to Calcium Limitation of Daphnia cf. pulex (Sensu Hebert, 1995) Populations in Cold Soft-Water Lakes

Calcium (Ca) is an important driver of community structure in freshwaters. We examined the combined effects of increased temperatures and variations in food quantity on the tolerance to low Ca of Daphnia pulex. The aim was to predict the impact of climate warming on this keystone zooplanktonic speci...

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Published in:Biology (Basel, Switzerland) Switzerland), 2022-10, Vol.11 (10), p.1539
Main Authors: Ramos-Rodríguez, Eloísa, Pérez-Martínez, Carmen, Conde-Porcuna, José María
Format: Article
Language:English
Subjects:
Algae
Aquatic ecosystems
Calcium
calcium limitation
cladocera
Climate change
Climate prediction
Cold
Community structure
Daphnia
Daphnia pulex
Ecosystems
Exoskeleton
Food
Food availability
food quantity
Food webs
Lakes
Life history
Metabolism
Temperature tolerance
warming
Water temperature
Zooplankton
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Summary:Calcium (Ca) is an important driver of community structure in freshwaters. We examined the combined effects of increased temperatures and variations in food quantity on the tolerance to low Ca of Daphnia pulex. The aim was to predict the impact of climate warming on this keystone zooplanktonic species in cold-climate lakes. We conducted a factorial life-history experiment in a clone of North American Daphnia cf. pulex to analyse the interaction effects of a temperature increase (17.5 °C−21 °C) within their physiological preferred range and expected by climate warming over the next few decades and a narrow Ca gradient (0.25−1.74 mg Ca L−1) under stressful vs. abundant food conditions. We found a striking positive synergistic effect of Ca and temperature on D. pulex reproduction at high food conditions. Although the increase in temperature to 21 °C greatly reduced survival, high energy allocation to reproduction at high food levels allowed the population to succeed in poor Ca (
ISSN:2079-7737
2079-7737
DOI:10.3390/biology11101539