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Large branchiopods in extensive carp ponds – morphometric analysis of Triops cancriformis (Bosc, 1801) and Streptocephalus torvicornis (Waga, 1842)

Stanisław Cukier
Stanisław Cukier
, 
Rafał Rączka
Rafał Rączka
 e 
Maciej Kamaszewski
Maciej Kamaszewski
   | 09 ott 2023
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Article Category: Original research paper
Pubblicato online: 09 ott 2023
Pagine: 374 - 388
Ricevuto: 27 mag 2022
Accettato: 01 giu 2023
DOI: https://doi.org/10.26881/oahs-2023.3.10
© 2023 Stanisław Cukier et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

Study area location and map of fishery ponds at Łaki Jaktorowskie Fisheries Research Station
Study area location and map of fishery ponds at Łaki Jaktorowskie Fisheries Research Station

Figure 2

Morphometric measurements of Streptocephalus torvicornis
Morphometric measurements of Streptocephalus torvicornis

Figure 3

Morphometric measurements of Triops cancriformis
Morphometric measurements of Triops cancriformis

Figure 4

Relationship between standard length and parameters: aj/pd, pd/bj, pd/sl, th/sl, th/sp in two age groups of Streptocephalus torvicornis.
Relationship between standard length and parameters: aj/pd, pd/bj, pd/sl, th/sl, th/sp in two age groups of Streptocephalus torvicornis.

Figure 5

Male second antennae of Streptocephalus torvicornis in different populations. Differentiating features: denticulation on thumb (d), peduncle distal outgrowth (p). A. Jaktorów (Poland) B. Malý Horeš (Slovakia) (Dumont et al. 1995), C. Kutab (Yemen) (Dumont et al. 1995). Differences: denticulation on thumb (d) – A and B – extending above thumb major inflexion, C – extending below thumb major inflexion; peduncle distal outgrowth (p) – A and B – protuberances, C – smooth.
Male second antennae of Streptocephalus torvicornis in different populations. Differentiating features: denticulation on thumb (d), peduncle distal outgrowth (p). A. Jaktorów (Poland) B. Malý Horeš (Slovakia) (Dumont et al. 1995), C. Kutab (Yemen) (Dumont et al. 1995). Differences: denticulation on thumb (d) – A and B – extending above thumb major inflexion, C – extending below thumb major inflexion; peduncle distal outgrowth (p) – A and B – protuberances, C – smooth.

Figure 6

Boxplot of th/sp parameter of Streptocephalus torvicornis populations from Jaktorów (two age groups, this publication) and other from data by Kppas et al. (2017).
Boxplot of th/sp parameter of Streptocephalus torvicornis populations from Jaktorów (two age groups, this publication) and other from data by Kppas et al. (2017).

Figure 7

Photo showing the first antennae in both sexes in Streptocephalus torvicornis: an I – first antennae, an II – second antennae, cr – crenation. The female has a smooth edge of the first antennae (there is no crenation).
Photo showing the first antennae in both sexes in Streptocephalus torvicornis: an I – first antennae, an II – second antennae, cr – crenation. The female has a smooth edge of the first antennae (there is no crenation).

Figure 8

Boxplot of Streptocephalus torvicornis morphometrics parameters in different age.
Boxplot of Streptocephalus torvicornis morphometrics parameters in different age.

Figure 9

Boxplot of Triops cancriformis morphometrics parameters for each sex.
Boxplot of Triops cancriformis morphometrics parameters for each sex.

Triops cancriformis morphometrics. ca – carapace length, ey – eye width, Avg. – average, N – number of measured specimens, SD – standard deviation, p-value – p-value for Wilcoxon test. Sex values: m – male, f/h – female/hermaphrodite.

sex ca ey ey/ca ls spi
[mm] [mm]
Avg. f/h 15.4 2.24 0.147 4.92 1
m 13.4 2.08 0.155 5.39 1
SD f/h 1.61 0.155 0.010 0.534 0
m 1.49 0.193 0.007 0.601 0
N f/h 19 19 19 19 19
m 8 8 8 9 9
p-value 0.014 0.075 0.016 – –

Streptocephalus torvicornis and Triops cancriformis total count of cysts per 1 kg for nursery ponds in Łąki Jaktorowskie Fisheries Research Station.

Species Pond I Pond II Pond III
Triops cancriformis 331 365 369
Streptocephalus torvicornis 1226 1309 1421

Results of morphometrics measurements by age group. tl – total length, aj – apical antennal joint length, pd – peduncle of the distal antenna outgrowth length, bj – basal joint length, th – thumb length, Avg. – average, N – number of measured specimens, SD – standard deviation, test – applied test, p-value – p-value for applied test.

  Age tl aj/pd pd/bj pd/sl th/sl th/sp
[days] [mm]
Avg. 60 15.6 0.615 1.55 0.208 0.133 2.99
90 18.2 0.681 1.58 0.188 0.114 2.73
SD 60 0.866 0.074 0.316 0.019 0.014 0.513
90 0.694 0.075 0.721 0.017 0.009 0.288
N 60 30 25 26 26 25 25
90 25 24 24 24 25 25
test – t-test Wilcoxon t-test t-test t-test
p-value – 0.003 0.330 < 0.001 < 0.001 0.033
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