Eutrophication strengthens the response of zooplankton to temperature changes in a high‐altitude lake

Abstract

To assess whether and how zooplankton communities respond to variations in temperature and how these assemblages change with eutrophication, we performed a large‐scale, monthly survey from August 2011 to July 2012 to determine the seasonal and spatial variations in these communities in a high‐altitude lake. A detrended correspondence analysis and a path analysis demonstrated that temperature and chlorophyll a were important factors influencing zooplankton. The path diagram showed that Daphnia was negatively affected directly by chlorophyll a and indirectly by temperature, whereas Bosmina was directly and positively affected by temperature. Daphnia spp. decreased in both absolute and relative biomass during warm seasons, whereas Bosmina spp. showed the opposite trend. Moreover, the lowest Daphnia spp. biomass was observed in the southern region, which was the most eutrophic. Our results indicate that increasing temperatures will continue to shift the dominant genus from Daphnia to Bosmina, and this change will be exacerbated by eutrophication. In addition, the zooplankton of Lake Erhai have shifted to smaller species over time as temperature and eutrophication have increased, which implies that zooplankton succession to small cladocerans may be markedly accelerated under further climate change and the increased eutrophication that has been observed in recent decades.

Seeking alternative stable states in a deep lake

“…Therefore, the succession in cladoceran pelagic assemblages during Lake Varese hypereutrophication is in line with nutrient-driven changes that have already been documented in literature (Alric et al, 2013;Li et al, 2016); however, the speed at which this shift occurred is stunning, especially for a large lake. There was consider- and suggested that pelagic communities in a still-nutrient-rich deep lake are highly sensitive to climate warming (Alric et al, 2013;Berthon et al, 2014;Savichtcheva et al, 2015).…”

“…Depending on the geomorphology, exposure or trophic level, climate warming can be detrimental to a species in one lake, but beneficial to the same one in a neighbouring system (Alric et al, 2013;Li et al, 2016).…”

Microbiology and Nitrogen Cycle in the Benthic Sediments of a Glacial Oligotrophic Deep Andean Lake as Analog of Ancient Martian Lake-Beds

“…In terrestrial analogs of wet and cold Early Mars, specific environmental conditions, such as periods of upstream permafrost freezing and thawing, or enlargement of the catchment area, result in an extra nutrient supply to glacial lakes (Rogora et al, 2008; Salerno et al, 2016). If these conditions persist, they can lead nutrient-poor lakes (oligotrophic) toward nutrient-rich (eutrophic) stages (Lyons et al, 2006), that can end in complete eutrophication where blooming of certain species change the evolution of the lake (Li et al, 2016). These natural feeding processes might have occurred very often along the Earth history as well as in other planetary bodies such as ancient Mars, where hydrothermal, meteoritic impacts, and glacial environment coexisted (Neukum et al, 2004).…”

Математическое Моделирование Влияния Эвтрофикации На Структуру И Динамику Отношений В Озерном Зоопланктоне

“…Велика в этом смысле также роль зоопланктона. В работе [8] исследуется влияние температурных изменений на развитие зоопланктона. В связи с глобальными климатическими изменениями значение этого фактора возрастает.…”