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176 results for “Cladocerans”
Paleolimnological assessment of a hyper-eutrophic lake (Nowlans Lake, N.S., Canada) Cladoceran communities
<p>Mink fur farming was once a widespread agricultural activity in southwestern Nova Scotia. Some freshwaters near mink fur farm operations now show severe water quality issues. Notably, the watershed of Nowlans Lake (southwestern Nova Scotia, Canada) once contained six mink farms as well as a fish meal feed processing plant. It is now one of the most productive lakes in Atlantic Canada, with exceedingly high measured Total Phosphorus concentrations.</p> <p>Here, we provide data from a paleolimnological investigation on the long-term environmental changes that occurred in Nowlans Lake, and how these changes have impacted cladoceran communities. First, we identify abundances of cladoceran taxa throughout the sediment core, corresponding to assemblages from the ~1900s to present day (determined by 210Pb dating analyses – see Table 1 of cited manuscript), and provide raw counts. We detected shifts in the dominant pelagic cladoceran taxa beginning in the early 1900s, with decreases in small-bodied bosminids, while taxa such as <em>Chydorus brevilabris</em> and <em>Daphnia pulex</em> spp. increased. We identified assemblage "zones" using a constrained hierarchal clustering analysis, denoting three distinct assemblage groups (Script 03). We then provide empirical measures of the body sizes of bosminids in each sediment interval, as body sizes of cladocerans are good proxies of shifts in predation. We identified bottom-up ecological factors as the likely drivers of these assemblage shifts, as body sizes were found to be consistent through time with a Mann Kendall Monotonic Trend Analysis (Script 02). Finally, we reconstructed and provide data on trends in sedimentary chl-a concentrations using visible reflectance spectroscopy (VRS). After conducting a PCA on cladoceran assemblages and extracting PC1 scores, we observed a strong relationship by VRS chl-a and PC1 scores, suggesting similar timing between increases in lake productivity and major cladoceran changes (Script 01).</p>
Fig 3 in First report of the high altitude cladoceran species Streblocerus serricaudatus (Fischer, 1849) S.LAT from the Western Ghats of India, Tamil Nadu
Fig 3: Google Map showing the Western Ghats of India and the collection locality Pechiparai dam in Tamil Nadu
Figure 9 in Effects of salinity tolerances on survival and life history of 2 cladocerans
Figure 9. Body morphology parameters curves of S. mucronata for the various salt concentrations (±standard error) due to time (with 95% confidence interval).
Figure 8 in Effects of salinity tolerances on survival and life history of 2 cladocerans
Figure 8. Growth rate of S. vetulus under different salt concentrations (with regression equations) in 8-day experiments (with 95% confidence interval).
Figure 7 in Effects of salinity tolerances on survival and life history of 2 cladocerans
Figure 7. Growth rate of S. mucronata under different salt concentrations (with regression equations) in 8-day experiments (with 95% confidence interval).
Figure 4 in Effects of salinity tolerances on survival and life history of 2 cladocerans
Figure 4. Total progeny of S. vetulus under different salt concentrations (with regression equations) in 8-day experiments (with 95% confidence interval).
Figure 2 in Effects of salinity tolerances on survival and life history of 2 cladocerans
Figure 2. Survivorship curves of S. vetulus under different salt concentrations (with regression equations) in 8-day experiments (n = 6; ±standard error; P <0.05).
Figure 1 in Morphological examination of the resting egg structure of 3 cladoceran species [Ceriodaphnia quadrangula (O. F. Müller, 1785), Daphnia longispina (O. F. Müller, 1776), and D. magna Straus, 1820]
Figure 1. Resting egg photos of 3 species (Daphnia magna, D. longispina, Ceriodaphnia quadrangula). A) SEM photo of C. quadrangula, B) SEM photo of D. longispina, C) SEM photo of D. magna, D) light microscope photo of C. quadrangula, E) light microscope photo of D. longispina, F) light microscope photo of D. magna.
Fig. 3 in The role of cladocerans in green and brown food web coupling
Fig. 3. The proportion of the contribution of POC, phytoplankton, and biofilm to cladoceran biomass in the three PIAP lagoons. Boxplots show the quartiles of 97.5%, 75%, 50%, 25%, and 2.5%. The lower and upper boxes indicate the 25% and 50% quartiles. Likewise, the lower and upper vertical lines indicate the 97.5% and 2.5% quartiles and the horizontal lines show the mode of contribution.
Figure 2 in Types of cladoceran species described by Sven Ekman in the Swedish Museum of Natural History, with redescription of Daphnia cavicervix Ekman, 1900 (Daphniidae, Anomopoda, Cladocera)
Figure 2. Daphnia cavicervix, parthenogenetic female from unknown water body near Morro Chico, Chile. (A) Adult parthenogenetic female, lectotype; arrows show portions of ventral margin enlarged in (H–M); (B) posterodorsal region; (C) reticulation on valves; (D, E) head and rostrum; (F) head shield, dorsal view; (G) labrum; (H– M) armature of ventral margin of valve; (N) postabdomen; (O, P) postabdominal claw in outer and inner view; (Q) juvenile female, second instar; (R, S) its postabdominal claw and abdominal projections. Scale bars: 0.1 mm.
Figure 3 in Types of cladoceran species described by Sven Ekman in the Swedish Museum of Natural History, with redescription of Daphnia cavicervix Ekman, 1900 (Daphniidae, Anomopoda, Cladocera)
Figure 3. Daphnia cavicervix, female from unknown water body near Morro Chico, Chile. (A) Antenna II; (B, C) apical segments of exopod and endopod; (D) limb I; (E) limb II; (F, G) limb III and its inner-distal portion; (H, I) limb IV and its inner-distal portion; (J) limb V. Scale bars: 0.1 mm.
Figure 1 in Types of cladoceran species described by Sven Ekman in the Swedish Museum of Natural History, with redescription of Daphnia cavicervix Ekman, 1900 (Daphniidae, Anomopoda, Cladocera)
Figure 1. Daphnia cavicervix from unknown water body near Morro Chico, Chile. (A) Adult parthenogenetic female, lectotype; (B) its head; (C) juvenile female; (D) its head; (E) its postabdomen; (F) ephippial female; (G) sculpture of ephippium; (H) juvenile male, pre-reproductive instar; (I) its head; (J) adult male; (K) its head. Scale bars were not taken.
Figure 4 in Types of cladoceran species described by Sven Ekman in the Swedish Museum of Natural History, with redescription of Daphnia cavicervix Ekman, 1900 (Daphniidae, Anomopoda, Cladocera)
Figure 4. Daphnia cavicervix from unknown water body near Morro Chico, Chile. (A) Ephippial female; (B) sculpture of ephippium, marginal portion; (C) sculpture of ephippium, portion close to egg chamber; (D) sculpture on egg chamber; (E) juvenile male (pre-reproductive instar); (F) its antenna I; (G) distal portion of its limb I. Scale bars: 0.1 mm.
Fig. 26 in Taxonomy and distribution of four Cladoceran families (Branchiopoda: Cladocera: Moinidae, Bosminidae, Chydoridae and Sididae) in Philippine inland waters
Fig. 26. Scanning electron micrographs of Diaphanosoma excisum. A, distal part of first segment of upper 2-segmented antennal branch; B, postero-ventral valve margin; C, ventral valve inflexion; D, terminal claws of post abdomen.
Fig. 22 in Taxonomy and distribution of four Cladoceran families (Branchiopoda: Cladocera: Moinidae, Bosminidae, Chydoridae and Sididae) in Philippine inland waters
Fig. 22. Scanning electron micrographs of Moinodaphnia macleayi parthenogenic female; A. habitus; B, head showing the antennule; C, antennule; D, antennae showing bas, end, and exopod.
Fig. 27 in Taxonomy and distribution of four Cladoceran families (Branchiopoda: Cladocera: Moinidae, Bosminidae, Chydoridae and Sididae) in Philippine inland waters
Fig. 27. Diaphamosoma sarsi, parthenogenetic female; A, habitus; B, postero-ventral valve margin; C, distal part of first segment of upper 2-segmented antennal branch; D, post abdomen.
Fig. 21. Moinodaphnia macleayi parthenogenic female. A in Taxonomy and distribution of four Cladoceran families (Branchiopoda: Cladocera: Moinidae, Bosminidae, Chydoridae and Sididae) in Philippine inland waters
Fig. 21. Moinodaphnia macleayi parthenogenic female. A, habitus; B, antennule with exopod; C, postabdomen; D, antennae.
Fig. 18 in Taxonomy and distribution of four Cladoceran families (Branchiopoda: Cladocera: Moinidae, Bosminidae, Chydoridae and Sididae) in Philippine inland waters
Fig. 18. Distribution of family Moinidae based on recently collected samples (2013) and stored samples in the UST ZRC.
Fig. 17 in Taxonomy and distribution of four Cladoceran families (Branchiopoda: Cladocera: Moinidae, Bosminidae, Chydoridae and Sididae) in Philippine inland waters
Fig. 17. Scanning electron micrographs of Oxyurella singalensis. A, habitus; B, post abdomen; C, Dorsal margin; D, rostrum and antennule.
Fig. 14 in Taxonomy and distribution of four Cladoceran families (Branchiopoda: Cladocera: Moinidae, Bosminidae, Chydoridae and Sididae) in Philippine inland waters
Fig. 14. Scanning electron micrographs of Anthalona sp. A, habitus; B, main and lateral head pores; C, antennae; D, post abdomen.
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