scholarly journals Variation in the response of crustacean zooplankton species richness and composition to the invasive predator Bythotrephes longimanus

2006 ◽  
Vol 63 (9) ◽  
pp. 2126-2136 ◽  
Author(s):  
Angela L Strecker ◽  
Shelley E Arnott ◽  
Norman D Yan ◽  
Robert Girard
Keyword(s):  
Species Richness ◽  
Zooplankton Community ◽  
Distribution Patterns ◽  
Crustacean Zooplankton ◽  
Bythotrephes Longimanus ◽  
Zooplankton Species ◽  
Cladoceran Species ◽  
Negative Effect ◽  
Composite Samples ◽  
Better Than

The predacious invertebrate Bythotrephes longimanus has now invaded >90 freshwater lakes in North America. There is some evidence that B. longimanus has a negative effect on summer zooplankton species richness; however, no study has examined the effect of B. longimanus throughout the ice-free season in more than one lake. We visited 10 invaded and 4 reference lakes every 2 weeks from May to September, collecting B. longimanus, crustacean zooplankton, and water chemistry samples. Composite samples were pooled across the study season for each lake. Bythotrephes longimanus significantly reduced cladoceran species richness, diversity, and abundance, and the total zooplankton community also exhibited decreased richness, diversity, and abundance. Seasonal sampling was better than synoptic surveys at detecting changes in abundance, but richness estimates were similar. As B. longimanus continues to spread across lake landscapes, we expect it will have profound impacts on local and regional richness and species distribution patterns.

Changes in the crustacean communities of Lakes Michigan, Huron, and Erie following the invasion of the predatory cladoceran Bythotrephes longimanus

2004 ◽  
Vol 61 (11) ◽  
pp. 2111-2125 ◽  
Author(s):  
Richard P Barbiero ◽  
Marc L Tuchman
Keyword(s):  
Zooplankton Community ◽  
Crustacean Zooplankton ◽  
Bythotrephes Longimanus ◽  
Zooplankton Community Structure ◽  
Cladoceran Species ◽  
Invertebrate Predators ◽  
Predatory Cladoceran ◽  
Leptodora Kindti ◽  
Escape Responses ◽  
Zooplankton Communities

The crustacean zooplankton communities in Lakes Michigan and Huron and the central and eastern basins of Lake Erie have shown substantial, persistent changes since the invasion of the predatory cladoceran Bythotrephes in the mid-1980s. A number of cladoceran species have declined dramatically since the invasion, including Eubosmina coregoni, Holopedium gibberum, Daphnia retrocurva, Daphnia pulicaria, and Leptodora kindti, and overall species richness has decreased as a result. Copepods have been relatively unaffected, with the notable exception of Meso cyclops edax, which has virtually disappeared from the lakes. These species shifts have for the most part been consistent and equally pronounced across all three lakes. Responses of crustacean species to the Bythotrephes invasion do not appear to be solely a consequence of size, and it is likely that other factors, e.g., morphology, vertical distribution, or escape responses, are important determinants of vulnerability to predation. Our results indicate that invertebrate predators in general, and invasive ones in particular, can have pronounced, lasting effects on zooplankton community structure.

8. The Effect of Bythotrephes Longimanus on the Size Structure of Zooplankton Communities in the Muskoka Region, Ontario

2017 ◽  
Author(s):  
Johanna Pokorny
Keyword(s):  
Large Scale ◽  
Size Structure ◽  
Scale Effects ◽  
Regional Scale ◽  
Zooplankton Community ◽  
Zooplankton Abundance ◽  
Bythotrephes Longimanus ◽  
Zooplankton Species ◽  
Community Size ◽  
Zooplankton Communities

Invasive species are considered the greatest threat to aquatic ecosystem biodiversity. Bythotrephes longimanus, an exotic zooplankton species introduced to North America in the 1980s, is threatening the structure of indigenous aquatic ecosystems as it continues to invade inland Ontario lakes. As a predacious zooplankton species, B. longimanus has been shown to decrease zooplankton abundance, species richness and shift zooplankton community size structure in invaded lakes. However, much of the previous research concerning the predatory effects of B. longimanus has been on surveys of a small number of lakes or has been in controlled mesocosm or lab-based experiments. This study examines the effects of B. longimanus on the zooplankton community using size-structure characterizations (grouping individuals from the community based on size) as community measures for 311 lakes in the Muskoka Region, a highly invaded watershed in Southern Ontario. More specifically, the study explores the size-spectra of invaded versus uninvaded lakes, with reference to an array of environmental lake characteristics (water chemistry, lake morphometry,etc.), and the relevance of B. longimanus activity on the regional scale. By using such a large-scale survey we will be able to appreciate regional-scale effects, as well as encompass the multiple and more indirect trophic interactions that B. longimanus is likely having with the entire aquatic community. (Funding: NSERC & CAISN.)

Recovery of Crustacean Zooplankton Species Richness in Sudbury Area Lakes following Water Quality Improvements

1991 ◽  
Vol 48 (9) ◽  
pp. 1635-1644 ◽  
Author(s):  
W. Keller ◽  
N. D. Yan
Keyword(s):  
Water Quality ◽  
Species Richness ◽  
Trace Metal ◽  
Crustacean Zooplankton ◽  
Zooplankton Species ◽  
Quality Improvements ◽  
Metal Concentrations ◽  
Crustacean Plankton ◽  
Zooplankton Communities ◽  
Plankton Communities

Temporal patterns in the species richness of crustacean zooplankton communities were assessed in eight Sudbury area lakes based on data collected between 1973 and 1986. Excluding a consistently nonacidic reference lake, the study lakes showed general reductions in acidity and trace metal concentrations during this period, related to reduced contaminant emissions from the Sudbury smelters. Despite water quality improvements, several of the study lakes continue to have low pH and elevated trace metal concentrations which have inhibited recovery of zooplankton species richness. However, in lakes with more favourable current pH and lower trace metal concentrations, substantial increases in the average species richness of crustacean plankton communities have occurred, apparently due to both invasion of new species and more frequent occurrence of existing species. These results clearly demonstrate that reductions in acid-forming emissions lead to both chemical and biological improvements in some aquatic systems.

scholarly journals Factors controlling crustacean zooplankton species richness in Neotropical lakes

2011 ◽  
Vol 33 (8) ◽  
pp. 1295-1303 ◽  
Author(s):  
N. Aranguren-Riano ◽  
C. Guisande ◽  
R. Ospina
Keyword(s):  
Species Richness ◽  
Crustacean Zooplankton ◽  
Zooplankton Species

scholarly journals Seasonal Variation of Zooplankton Communities and the Effects of Environmental Factors in the Seawater Near Taishan Nuclear Power Station

2021 ◽  
Vol 20 (4) ◽  
Author(s):  
R. He ◽  
H.P. Jiao ◽  
N. He ◽  
Y.Y. Chang ◽  
H.Y. Jiang ◽  
...  
Keyword(s):  
Species Richness ◽  
Environmental Factors ◽  
Nuclear Power ◽  
Dominant Species ◽  
Diversity Index ◽  
Zooplankton Community ◽  
Zooplankton Species ◽  
Power Station ◽  
Annual Average ◽  
Evenness Index

In the seawater near Taishan Nuclear Power Station, Zooplankton community composition and abundance, the biomass of major taxa, vertical distribution pattern, together with several environmental factors were investigated to evaluate the variation tendency as the seasons change. The structure characteristics of the zooplankton community were analyzed by Margalef species richness (d), Shannon-wiener species diversity index (H’), Pielou evenness index(J’), zooplankton dominant (Y), and dominant species replacement rate (R). There are 48 species within 11 classes of zooplankton identified, including 32 species of copepods. Zooplankton species richness changed obviously in the four seasons, Spring saw the highest (8010.00 ind.m-3), followed by winter (5100.00 ind.m-3), autumn (1713.75 ind.m-3), and summer (1196.25 ind.m-3). Similar trends were observed for the wet biomass, which was highest in spring (215.90 mg.m-3), followed by winter (181.70 mg.m-3), summer (78.56 mg.m-3), and autumn (24.69 mg.m-3), which gave an annual average of 125.21 mg.m-3. The results indicate that the abundance and biomass in spring were significantly higher than those in other seasons. Altogether 8 dominant species were identified along the whole year: Acrocalanmus gibber, Bestiolina amoyensis, Paracalanus parvus, Acartia danae, Mesocyclops leuckarti, Noctiluca scientillans, Penilla avirostris, and Lucifer penicilliger. The annual average Shannon-Wiener diversity index, Margalef diversity index, Pielou evenness index were 1.75, 1.83, and 0.74, respectively. The effects of environmental factors on the zooplankton community were studied by R and canonical correspondence analysis (CCA). According to Pearson correlation analysis and canonical correspondence analysis, the most important environmental factors influencing the changes of zooplankton species composition, abundance and distribution were water temperature, salinity, and pH in the whole year.

scholarly journals A long-term study on crustacean plankton of a shallow tropical lake: the role of invertebrate predation

2015 ◽  
Author(s):  
Marlene S. Arcifa ◽  
Tânia C. Dos Santos Ferreira ◽  
Claudia Fileto ◽  
Maria S. Maioli Castilho-Noll ◽  
Taís C. Bunioto ◽  
...  
Keyword(s):  
Species Richness ◽  
Zooplankton Community ◽  
Tropical Lake ◽  
Long Term Study ◽  
Cladoceran Species ◽  
Before And After ◽  
Crustacean Plankton ◽  
Predator Abundance ◽  
Long Term Impact

<p>The primary factor that governs the size and species composition of zooplankton is still a controversial issue and temperature is considered the main factor responsible for latitudinal differences. In waters with a narrow temperature range, such as in the tropics, predation may be a more important factor. Nearly three decades of intermittent studies of the crustacean plankton in a shallow tropical lake revealed that the main event that led to their restructuring was the appearance of a second predator, the water mite <em>Krendowskia </em>sp. The new predator and larvae of the dipteran <em>Chaoborus brasiliensis</em> Theobald exerted a combined, although asymmetrical effect on microcrustaceans. The period when the mite was detected was followed by the restructuring of the crustacean plankton community. Predation by these two invertebrates emerged as the factor responsible for community changes, involving an increased contribution of copepods and decreases in the relative abundance of smaller cladoceran species. In the short term, the mite caused a decrease in species richness and the annual mean instantaneous composition of cladocerans, a predominance of large-sized species (<em>Daphnia ambigua </em>Scourfield<em> </em>and <em>Daphnia gessneri</em> Herbst) and the virtual disappearance of small species (e.g., <em>Bosmina tubicen</em> Brehm). The long-term impact resulted in increased species richness and the dominance of large and medium-sized cladocerans, such as <em>D. gessneri</em> and <em>Ceriodaphnia richardi</em> Sars. The larger body size of three cladocerans, the two <em>Daphnia</em> species and <em>B. tubicen</em>, in the long term, may be a response to the dominant predator, <em>Chaoborus</em>. The seasonal variation in the predator abundance, mainly <em>Chaoborus </em>larvae, allowed the prey to recover during the cool season. The copepods <em>Tropocyclops prasinus meridionalis</em> (Fischer) and <em>Thermocyclops decipiens</em> Kiefer were less affected by predation than the cladocerans; their contribution to the crustacean plankton increased 12-28% after the mite appeared. The top-down effect on crustacean plankton did not affect the phytoplankton, which remained dominated by chlorophyceans and the nanoplankton fraction before and after the zooplankton community restructuring.</p>

The differing crustacean zooplankton communities of Canadian Shield lakes with and without the nonindigenous zooplanktivore Bythotrephes longimanus

2003 ◽  
Vol 60 (11) ◽  
pp. 1307-1313 ◽  
Author(s):  
Stephanie A Boudreau ◽  
Norman D Yan
Keyword(s):  
Zooplankton Biomass ◽  
Canadian Shield ◽  
Crustacean Zooplankton ◽  
Bythotrephes Longimanus ◽  
Cladoceran Species ◽  
Zooplankton Communities ◽  
Shield Lakes ◽  
Total Zooplankton Biomass ◽  
Harp Lake

The nonindigenous predatory cladoceran Bythotrephes longimanus is spreading rapidly among Canadian Shield lakes, but only one case study of its impacts exists. In Harp Lake, the abundances of several cladoceran and one cyclopoid species fell after the invasion, and far fewer species benefited. To determine if Harp Lake provides typical results, we compared the summer crustacean zooplankton communities of 17 invaded and 13 noninvaded (reference) lakes in Ontario. The communities of the two lake groups differed. Average species richness was 30% higher in the reference (15.3 species) vs. the invaded lakes (11.8 species). Total zooplankton biomass was significantly lower in the invaded lakes, mainly because of lower abundances of all common epilimnetic cladoceran species. As these results were quite similar to those of Harp Lake, it is apparent that current summer zooplankton communities of Canadian Shield lakes with Bythotrephes differ substantially from noninvaded lakes.

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