Changes in the abundance of planktivorous fish in Lake Skanderborg during the past two centuries—a palaeoecological approach

Jensen, Jens Peder; Skovgaard, Henrik; Hvidt, Christian B.

doi:10.1016/s0031-0182(01)00279-6

Cited by 34 publications

(13 citation statements)

References 24 publications

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“…Derraz et al (2003) demonstrated experimentally that, in the absence of crustaceans, small phytoplankton and small ciliates become more abundant. In Abo Zaabal Lake, the absence of Cladocera and the low numbers of Copepoda could be due to the effects of fish predation, which was found to be the major factor structuring zooplankton assemblages in several studies (Jeppesen et al 2001, Havens 2002, Hobaek et al 2002. This phenomenon was confirmed by Hunt and Matveev (2005), who observed rotifer domination in the presence of planktivorous fishes in Maroon Lake, Australia, and cladoceran domination in lake enclosures without fish.…”

Section: Discussionmentioning

confidence: 98%

The zooplankton community of Lake Abo Zaabal, a newly-formed mining lake in Cairo, Egypt

El-Bassat

Taylor

2007

African Journal of Aquatic Science

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Abo Zaabal Lake, a new mining lake at the outskirts of Cairo, receives domestic sewage from a nearby village. We examined its chemical and biological properties in order to develop a plan to improve its ecosystem services. The pH ranged between 7.8 and 8.5, salinity was 17ppt and conductivity was 28 mS cm -1 , indicating brackish water. The pelagic zooplankton community comprised Rotifera (16%), Protozoa (Ciliophora and Rhizopoda) (18%) and Copepoda (16%). Cladocera were seldom recorded. Hexarthra, Brachionus and Rotaria were the dominant rotifer taxa. Several characteristics -including the community composition, the dominance of small ciliates and nauplii, the abundance of Cyanobacteria, and the absence of macrophytes -indicated that it is a severely eutrophic lake. To improve the water quality we recommend that: (1) domestic sewage inflow should be stopped so as to reduce nutrient loading into the basin; (2) the growth of rooted macrophytes should be encouraged so as to increase water transparency by reducing phytoplankton biomass through competition for nutrients; and (3) piscivorous fish should be introduced to control zooplanktivorous fish in the lake and thus promote the growth of large filter-feeding zooplankton.

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Section: Discussionmentioning

confidence: 98%

The zooplankton community of Lake Abo Zaabal, a newly-formed mining lake in Cairo, Egypt

El-Bassat

Taylor

2007

African Journal of Aquatic Science

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“…In addition, in a survey based on contemporary spot sampling of 104 Alaskan arctic lakes O'Brian et al (2004) showed lake depth and area to be the singlemost important factors influencing zooplankton distribution and species richness. Yet, none of these studies included fish, which have been shown to be a major structuring factor in other studies (Jeppesen et al, 2001c).…”

Section: Discussionmentioning

confidence: 99%

Lake depth rather than fish planktivory determines cladoceran community structure in Faroese lakes – evidence from contemporary data and sediments

Amsinck¹,

Strzelczak²,

Bjerring

et al. 2006

Freshwater Biology

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1. This study describes the environmental conditions and cladoceran community structure of 29 Faroese lakes with special focus on elucidating the impact of fish planktivory. In addition, long-term changes in biological structure of the Faroese Lake Heygsvatn are investigated. 2. Present-day species richness and community structure of cladocerans were identified from pelagial snapshot samples and from samples of surface sediment (0-1 cm). Multivariate statistical methods were applied to explore cladoceran species distribution relative to measured environmental variables. For Lake Heygsvatn, lake development was inferred by cladoceran-based paleolimnological investigations of a 14 C-dated sediment core covering the last ca 5700 years. 3. The 29 study lakes were overall shallow, small-sized, oligotrophic and dominated by brown trout (Salmo trutta). Cladoceran species richness was overall higher in the surface sediment samples than in the snapshot samples. 4. Fish abundance was found to be of only minor importance in shaping cladoceran community and body size structure, presumably because of predominance of the less efficient zooplanktivore brown trout. 5. Canonical correspondence analysis showed maximum lake depth (Z max ) to be the only significant variable in explaining the sedimentary cladoceran species (18 cladoceran taxa, two pelagic, 16 benthic) distribution. Multivariate regression trees revealed benthic taxa to dominate in lakes with Z max < 4.8 m and pelagic taxa to dominate when Z max was > 4.8 m. 6. Predictive models to infer Z max were developed using variance weighted-averaging procedures. These were subsequently applied to subfossil cladoceran assemblages identified from a 14 C-dated sediment core from Lake Heygsvatn and showed inferred Z max to correspond well to the present-day lake depth. A recent increase in inferred Z max may, however, be an artefact induced by, for instance, eutrophication.

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“…The response of cladocerans to anthropogenically induced changes has enabled pseudofossils of cladocerans, in particular chydorids, to be used widely in palaeolimnological studies to reconstruct trophic or acid conditions (Harmsworth & Whiteside, 1968;Whiteside, 1970;Brodersen et al, 1998;Jeppesen et al, 2001a), infer changes in macrophyte and fish communities (Jeppesen et al, 2001b;Davidson et al, 2010a, b) and to trace temperature changes (Duigan & Birks, 2000). The fact that cladocerans have been used to track changes in such a variety of parameters is an indication of their sensitivity to the many anthropogenic stresses currently at play as discussed above.…”

Section: Assessment: Palaeoecological Samplesmentioning

confidence: 99%

Zooplankton as indicators in lakes: a scientific-based plea for including zooplankton in the ecological quality assessment of lakes according to the European Water Framework Directive (WFD)

et al. 2011

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With the implementation of the EU Water Framework Directive (WFD), the member states have to classify the ecological status of surface waters following standardised procedures. It was a matter of some surprise to lake ecologists that zooplankton were not included as a biological quality element (BQE) despite their being considered to be an important and integrated component of the pelagic food web. To the best of our knowledge, the decision of omitting zooplankton is not wise, and it has resulted in the withdrawal of zooplankton from many so-far-solid monitoring programmes. Using examples from particularly Danish, Estonian, and the UK lakes, we show that zooplankton (sampled from the water and the sediment) have a strong indicator value, which cannot be covered by sampling fish and phytoplankton without a very comprehensive and costly effort. When selecting the right metrics, zooplankton are cost-efficient indicators of the trophic state and ecological quality of lakes. Moreover, they are important indicators of the success/ failure of measures taken to bring the lakes to at least good ecological status. Therefore, we strongly recommend the EU to include zooplankton as a central BQE in the WFD assessments, and undertake similar regional calibration exercises to obtain relevant and robust metrics also for zooplankton as is being done at present in the cases of fish, phytoplankton, macrophytes and benthic invertebrates.

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Changes in the abundance of planktivorous fish in Lake Skanderborg during the past two centuries—a palaeoecological approach

Cited by 34 publications

References 24 publications

The zooplankton community of Lake Abo Zaabal, a newly-formed mining lake in Cairo, Egypt

The zooplankton community of Lake Abo Zaabal, a newly-formed mining lake in Cairo, Egypt

Lake depth rather than fish planktivory determines cladoceran community structure in Faroese lakes – evidence from contemporary data and sediments

Zooplankton as indicators in lakes: a scientific-based plea for including zooplankton in the ecological quality assessment of lakes according to the European Water Framework Directive (WFD)

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