Serial introductions modify a trophic cascade and partially mitigate changes in lake ecosystem structure

2019 ◽  
Vol 38 (3) ◽  
pp. 642-653
Author(s):  
David C. Richardson ◽  
Emma C. Bruno ◽  
Hailee L. Edwards ◽  
Dejea M. Green ◽  
Anthony J. Hollander ◽  
...  
Keyword(s):  
Trophic Cascade ◽  
Lake Ecosystem ◽  
Ecosystem Structure

scholarly journals Fisheries impacts on lake ecosystem structure in the context of a changing climate and trophic state

2017 ◽  
Author(s):  
Tiina Nõges ◽  
Orlane Anneville ◽  
Jean Guillard ◽  
Juta Haberman ◽  
Ain Järvalt ◽  
...  
Keyword(s):  
Water Quality ◽  
Trophic State ◽  
Scale Effects ◽  
Trophic Levels ◽  
Interactive Effects ◽  
Phosphorus Loading ◽  
Lake Ecosystem ◽  
Ecosystem Structure ◽  
Top Down ◽  
Lake Basins

<p>Through cascading effects within lake food webs, commercial and recreational fisheries may indirectly affect the abundances of organisms at lower trophic levels, such as phytoplankton, even if they are not directly consumed. So far, interactive effects of fisheries, changing trophic state and climate upon lake ecosystems have been largely overlooked. Here we analyse case studies from five European lake basins of differing trophic states (Lake Võrtsjärv, two basins of Windermere, Lake Geneva and Lake Maggiore) with long-term limnological and fisheries data. Decreasing phosphorus concentrations (re-oligotrophication) and increasing water temperatures have been reported in all five lake basins, while phytoplankton concentration has decreased only slightly or even increased in some cases. To examine possible ecosystem-scale effects of fisheries, we analysed correlations between fish and fisheries data, and other food web components and environmental factors. Re-oligotrophication over different ranges of the trophic scale induced different fish responsesIn the deeper lakes Geneva and Maggiore, we found a stronger link between phytoplankton and planktivorous fish and thus a more important cascading top-down effect than in other lakes. This connection makes careful ecosystem-based fisheries management extremely important for maintaining high water quality in such systems. We also demonstrated that increasing water temperature might favour piscivores at low phosphorus loading, but suppresses them at high phosphorus loading and might thus either enhance or diminish the cascading top-down control over phytoplankton with strong implications for water quality.</p>

Ecological differences between two closely related morphologically similar benthic whitefish (Prosopium spilonotus and Prosopium abyssicola) in an endemic whitefish complex

2006 ◽  
Vol 63 (8) ◽  
pp. 1700-1709 ◽  
Author(s):  
Benjamen M Kennedy ◽  
Brett W Thompson ◽  
Chris Luecke
Keyword(s):  
Resource Use ◽  
Species Conservation ◽  
Distinct Group ◽  
Community Diversity ◽  
Lake Ecosystem ◽  
Ecosystem Structure ◽  
Lake Whitefish ◽  
Closely Related Species ◽  
Bear Lake ◽  
Ecological Differences

Identifying the differences in ecology between closely related species occupying the same environment contributes to our understanding of community diversity, ecosystem structure, and species conservation. Endemic Bear Lake whitefish (Prosopium abyssicola) and Bonneville whitefish (Prosopium spilonotus) are benthic, morphologically similar, and closely related, yet the extent of differential resource use remains poorly understood. To determine the ecological differences between these two species, we studied their seasonal distribution and diet in Bear Lake, Utah–Idaho. We used bottom-set gill nets to examine how catch of each species of whitefish varied in relation to depth and season (spring and summer). In both spring and summer, Bonneville whitefish dominated the shallower depths (5–30 m), whereas Bear Lake whitefish dominated the deeper depths (45–55 m). Bonneville whitefish ate a variety of benthic invertebrates, but mostly Chironomidae, whereas Bear Lake whitefish fed mostly on Ostracoda. These data describe a closely related morphologically similar, yet ecologically distinct group of whitefish in an ecoregion completely different from those studied before. These results indicated that each species has a very different role in the Bear Lake ecosystem. To conserve this unique fish assemblage, both shallow and deepwater habitats need to be protected.

Lake Shira, a Siberian salt lake: ecosystem structure and function

1999 ◽  
Vol 8 (3) ◽  
pp. 211-232 ◽  
Author(s):  
Tatyana A. Zotina ◽  
Alexander P. Tolomeyev ◽  
Nadezhda N. Degermendzhy
Keyword(s):  
Salt Lake ◽  
Structure And Function ◽  
Lake Ecosystem ◽  
Ecosystem Structure ◽  
Lake Shira ◽  
And Function ◽  
Ecosystem Structure And Function

The Lake Ecosystem: Structure and Development

2008 ◽  
pp. 229-294 ◽  
Author(s):  
Dingtian Yang ◽  
Yunlin Zhang ◽  
Weimin Chen
Keyword(s):  
Lake Ecosystem ◽  
Ecosystem Structure

Factors Leading to Increased Algal Production in Mountain Lakes: A Paleolimnological Perspective from the Uinta Mountains, Utah, USA

2020 ◽  
Author(s):  
Katrina A. Moser ◽  
Elizabeth J Hundey ◽  
Maria E. Sia ◽  
Rebecca M. Doyle ◽  
Holly Dunne ◽  
...  
Keyword(s):  
Human Activities ◽  
Sediment Cores ◽  
Mountain Lakes ◽  
Mountain Lake ◽  
Lake Ecosystem ◽  
Ecosystem Structure ◽  
Nutrient Inputs ◽  
Cold Temperatures ◽  
Algal Production ◽  
Subalpine Lakes

&lt;p&gt;Mountain lakes are often remote, located in environments that experience cold temperatures, high incident solar and ultraviolet radiation, and prolonged ice and snow cover. They are, therefore, frequently dilute and oligotrophic. Together these factors can a&amp;#64256;ect mountain lake ecosystem structure, diversity, and productivity. However, distant human activities resulting in atmospheric pollution, as well as more local disturbances, such as fish stocking, potentially increase nutrient inputs and alter mountain lake ecosystems. Our research addresses how these human activities have altered algal production in Uinta Mountain (Utah, USA) lakes. Sedimentary chlorophyll a and its derivatives were measured using visible reflectance spectroscopy in short sediment cores from a total of 12 lakes, including both alpine and subalpine lakes, to determine trends in algal production. All sediment cores were dated using &lt;sup&gt;210&lt;/sup&gt;Pb and &lt;sup&gt;14&lt;/sup&gt;C dating, and the records were shown to extend back 300 to 500 years. Our results show that regardless of whether lakes were stocked or not, algal production remained virtually unchanged until 1950 when it increased dramatically in most lakes. The widespread distribution of the sites points to a regional stressor, such as atmospheric deposition of nutrients, as being the main cause for increased algal production. Additional analyses, including diatoms and C and N isotopes, measured in sediments from some lakes support this finding. The few lakes where algal production trends differed showed either that algal production had changed little overtime or that it was variable throughout the record. Although speculative, the lake that showed unchanged algal production is surrounded by a wetland that may have contributed nitrogen to the lake throughout the record meaning that additional nitrogen had little effect on algal production. Lakes with more variable algal production were subalpine lakes. The variable trend may point to more complex pathways and transport of nitrogen from the catchment to the lakes at lower elevation sites. Our findings show that remote mountain lakes, which typically are important water resources and biodiversity hotspots, are rapidly changing as a result of human activities, but not all of these lakes are responding in the same way. To effectively protect mountain lakes it will be important to identify and quantify influential factors affecting lake response to anthropogenic stressors.&amp;#160;&amp;#160;&lt;/p&gt;

scholarly journals Innovated Management Design of Lake Kinnere (Israel) and its Drainage Basin

2016 ◽  
Vol 3 (1) ◽  
pp. 1 ◽  
Author(s):  
Moshe Gophen
Keyword(s):  
Drainage Basin ◽  
Southern Oscillation ◽  
Climatic Conditions ◽  
Lake Kinneret ◽  
Lake Ecosystem ◽  
Ecosystem Structure ◽  
Nutrient Inputs ◽  
Land Utilization ◽  
Project Structure ◽  
The Impact

<p>During the last 80 years, the Lake Kinneret and its Drainage Basin ecosystems have undergone significant anthropogenic and natural modifications. Man made operations in the drainage basin and in the lake, accompanied by natural climatic conditions, resulted in modifications of the ecosystem structure. Old lake Hula and swamps were dredged and were being converted for agricultural development. Years later, the partial land utilization was modified, in an operation, referred to as the Hula Project operation. Twenty years later, several improvements for the Hula Project structure are suggested. Regimes of nutrient inputs into Lake Kinneret were changed by a decline in Nitrogen influx. Air and epilimnetic water temperature increase, as well as change of the nutrients composition. The lake ecosystem was shifted from P to N limitation. The phytoplankton and fish communities in the lake, were respectively modified. There were enhancements in N<sub>2</sub>-Fixing Cyano-bacteria and Bleak fishes beside the partial decline of tilapias. The impact of Albedo and ENSO (EL-NIÑO/SOUTHERN OSCILLATION) factors is indicated. A combined impact of the natural and anthropogenic parameters are involved. An innovation in the management design within the lake, and the drainage basin ecosystems are suggested: 1: Cutoff of beach vegetation along 20% of the shoreline length enabling public recreation; 2: Intensification of Bleak and improvement of Tilapias fisheries aimed at both, the fishers’ income and the water quality improvement; 3) Slight changes in the Hula Project structure.</p>

scholarly journals Impact of herbivory and competition on lake ecosystem structure: underwater experimental manipulation

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Ivana Vejříková ◽  
Lukáš Vejřík ◽  
Jan Lepš ◽  
Luboš Kočvara ◽  
Zuzana Sajdlová ◽  
...  
Keyword(s):  
Experimental Manipulation ◽  
Lake Ecosystem ◽  
Ecosystem Structure

scholarly journals Mapping habitats in a marine reserve showed how a 30-year trophic cascade altered ecosystem structure

2012 ◽  
Vol 155 ◽  
pp. 193-201 ◽  
Author(s):  
Kévin Leleu ◽  
Brice Remy-Zephir ◽  
Roger Grace ◽  
Mark J. Costello
Keyword(s):  
Trophic Cascade ◽  
Marine Reserve ◽  
Ecosystem Structure

scholarly journals Long-term effects of a trophic cascade in a large lake ecosystem

2011 ◽  
Vol 108 (3) ◽  
pp. 1070-1075 ◽  
Author(s):  
B. K. Ellis ◽  
J. A. Stanford ◽  
D. Goodman ◽  
C. P. Stafford ◽  
D. L. Gustafson ◽  
...  
Keyword(s):  
Trophic Cascade ◽  
Lake Ecosystem ◽  
Large Lake ◽  
Long Term Effects
Sign in / Sign up

Export Citation Format

Share Document