Diel dynamics of vertical changes of chlorophyll and bacteriochlorophyll in small humic lakes

Abstract

The diel variability of algal and bacterial chlorophyll and the physicochemical parameters (temperature, pH, dissolved oxygen, conductivity, transparency) in the vertical profile of three mid-forest humic lakes in Drawa National Park (northwest Poland) were analyzed in summer. The euphotic zone consisted of the smaller part of the water column in poly-and mesohumic lakes but almost the whole water column of the oligohumic lake. The 24-hour dynamics of chlorophyll a and bacteriochlorophyll d+e in poly-and mesohumic lake was significantly smaller than that in the polyhumic lake. The maximum concentrations of chlorophyll a and bacteriochlorophyll d+e were observed near the bottom border or below the euphotic zone in waters with oxygen deficits and containing sulfur hydrogen. The main producers of chlorophyll in meso-and oligohumic lake were green anaerobic sulphuric bacteria.

Effects of Sampling Time and Depth on Phytoplankton Metrics in Agricultural Irrigation Ponds

“…This coincides with the findings of Cui et al [101] who observed that at open water stations of the Three Gorges Reservoir in China, maximum chlorophyll-a concentrations rarely reached surface waters but aggregated near the 0.5-1.0 m layer. Similar observations were reported by Joniak et al [105] for oligohumic and mesothermic lakes. Inspection of precipitation data (Table S2) and patterns of chlorophyll-a and phycocyanin did not show any association, but sampling closer to precipitation events may reveal different associations between time, depth, phytoplankton community and pigment concentrations, as suggested by Bergkemper and Weisse [106], Ivey et al [84], and Lefort and Gasol [107].…”

Naturally acidic waterways: conceptual food webs for better management and understanding of ecological functioning

“…Bacterioplankton use the DOC as a food source and are able to replicate very quickly forming an important food resource for organisms higher up the food chain (Arvola and Tulcnen, ; Arvola et al ., ). This microbial loop is an important energy flow path in both lentic and lotic naturally acidic waterways (Mallin et al ., ; Meyer, ; Joniak et al ., ).…”

“…The input of allochthonous DOC plays a critical role in influencing the composition of plankton communities in naturally acidic waterways. Unlike other waterways that are often dominated by phytoplankton, the biomass and production of bacterioplankton in acidic waterways outnumbers that of phytoplankton several‐fold (Figure ) (Salonen et al ., ; Jansson et al ., ; Mallin et al ., ; Joniak et al ., ). Bacterioplankton use the DOC as a food source and are able to replicate very quickly forming an important food resource for organisms higher up the food chain (Arvola and Tulcnen, ; Arvola et al ., ).…”

“…resource for organisms higher up the food chain (Arvola and Tulcnen, 1998;Arvola et al, 1999). This microbial loop is an important energy flow path in both lentic and lotic naturally acidic waterways (Mallin et al, 2004;Meyer, 1994;Joniak et al, 2010). In contrast to other freshwater environments, the number of autotrophs is typically low in naturally acidic waterways.…”

The Effect of Human Impact on the Water Quality and Biocoenoses of the Soft Water Lake with Isoetids: Lake Jeleń, NW Poland

“…Moreover, changes in the character of rainfall (an increase of heavy rains) driven by climate changes may result in increased surface runoff and transport of humic substances to the lakes [10,11]. Humic substances not only acidify SLI but also affect underwater light conditions since they increase the color of water, decrease light penetration and thus affect the survival of macrophytes [12]. The accelerated eutrophication of SLI is usually the result of a complex of processes.…”