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Otolith phenotypic analysis for the endemic Anatolian fish species, Caucasian bleak Alburnus escherichii Steindachner, 1897 (Teleostei, Leuciscidae), from Selevir Reservoir, Akarçay Basin, Turkey

Melek Ozpicak
Melek Ozpicak
, 
Semra Saygin
Semra Saygin
, 
Savas Yilmaz
Savas Yilmaz
 oraz 
Nazmi Polat
Nazmi Polat
   | 03 gru 2021
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Article Category: Original research paper
Data publikacji: 03 gru 2021
Zakres stron: 430 - 440
Otrzymano: 03 mar 2021
Przyjęty: 15 kwi 2021
DOI: https://doi.org/10.2478/oandhs-2021-0037
Słowa kluczowe
© 2021 Melek Ozpicak et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

Sampling area of A. escherichii; (•) Selevir Reservoir
Sampling area of A. escherichii; (•) Selevir Reservoir

Figure 2

Lagenar (asteriscus) and utricular (lapillus) otoliths in A. escherichii sampled from Selevir Reservoir; the distal (a) view of the right asteriscus and the dorsal (b) view of the right lapillus (AL – asteriscus length; AH – asteriscus height; LL – lapillus length; LW – lapillus width; A – anterior; P – posterior; D – dorsal; V – ventral; L – lateral; M – medial), Scale bar = 1mm
Lagenar (asteriscus) and utricular (lapillus) otoliths in A. escherichii sampled from Selevir Reservoir; the distal (a) view of the right asteriscus and the dorsal (b) view of the right lapillus (AL – asteriscus length; AH – asteriscus height; LL – lapillus length; LW – lapillus width; A – anterior; P – posterior; D – dorsal; V – ventral; L – lateral; M – medial), Scale bar = 1mm

Figure 3

SEM pictures of utricular and lagenar otolith pairs in A. escherrichii. (a) Right asteriscus on the distal side; (b) right asteriscus on the proximal side (upper sample = 960 mm TL; lower sample = 1410 mm TL); (c) right lapillus on the dorsal side; (d) right lapillus on the ventral side (upper sample = 960 mm TL; lower sample = 1410 mm TL). A – anterior; P – posterior; D – dorsal; V – ventral; L – lateral; M – medial; lm – lobus major; fa – fossa acustica; Scale bar = 1 mm
SEM pictures of utricular and lagenar otolith pairs in A. escherrichii. (a) Right asteriscus on the distal side; (b) right asteriscus on the proximal side (upper sample = 960 mm TL; lower sample = 1410 mm TL); (c) right lapillus on the dorsal side; (d) right lapillus on the ventral side (upper sample = 960 mm TL; lower sample = 1410 mm TL). A – anterior; P – posterior; D – dorsal; V – ventral; L – lateral; M – medial; lm – lobus major; fa – fossa acustica; Scale bar = 1 mm

Relationships between Lt and otolith dimensions

Variable Linear r2 Power r2
a b a b
Length Asteriscus 0.365 0.120 0.533 0.264 0.773 0.539
Right lapillus 0.475 0.093 0.556 0.290 0.683 0.563
Left lapillus 0.469 0.096 0.565 0.288 0.696 0.569
Height Right asteriscus 0.628 0.093 0557 0.373 0.620 0.563
Left asteriscus 0.623 0.094 0.546 0.369 0.627 0.551
Width Lapillus 0.369 0.067 0.392 0.246 0.627 0.389
Weight Asteriscus −0.0009 0.0002 0.500 2E−05 1.713 0.474
Lapillus −0.0016 0.0003 0.488 8E−06 2.111 0.546
Perimeter Asteriscus 0.886 0.463 0.581 0.806 0.835 0.585
Right lapillus 1.346 0.256 0.550 0.856 0.659 0.548
Left lapillus 1.338 0.263 0.554 0.850 0.669 0.550
Area Right asteriscus −0.466 0.217 0.594 0.093 1.255 0.610
Left asteriscus −0.482 0.220 0.594 0.092 1.266 0.606
Right lapillus −0.407 0.150 0.524 0.058 1.275 0.533
Left lapillus −0.422 0.155 0.527 0.058 1.289 0.539

Descriptive statistics of otolith characteristics for Caucasian bleak by length classes

Character Otolith length Otolith height/width Otolith weight Otolith perimeter Otolith area
Min. Max Mean ± SD Min. Max Mean ± SD Min. Max Mean ± SD Min. Max Mean ± SD Min. Max Mean ± DS
Class I (6.7–10.9 cm Lt) (N = 94) RA 0.985 1.907 1.596 ± 0.15 1.082 1.991 1.596 ± 0.15 0.00036 0.00140 0.00095 ± 0.0002 3.500 6.507 5.591 ± 0.51 0.772 2.397 1.742 ± 0.22
LA 0.998 1.915 1.591 ± 0.15 1.053 1.863 1.582 ± 0.12 0.00037 0.00143 0.00095 ± 0.0002 3.442 6.764 5.633 ± 0.52 0.767 2.362 1.756 ± 0.23
RL 0.919 1.616 1.420 ± 0.11 0.733 1.460 1.058 ± 0.10 0.00024 0.00174 0.00115 ± 0.0002 2.644 4.610 3.965 ± 0.30 0.506 1.502 1.128 ± 0.16
LL 0.919 1.678 1.452 ± 0.11 0.733 1.770 1.063 ± 0.12 0.00024 0.00183 0.00115 ± 0.0002 2.644 4.678 4.028 ± 0.30 0.506 1.553 1.160 ± 0.16
Class II (11.0–15.0 cm Lt) (N = 60) RA 1.356 2.681 1.782 ± 0.20 1.304 2.197 1.720 ± 0.13 0.00031 0.00301 0.00122 ± 0.0003 4.707 8.865 6.347 ± 0.70 1.224 3.471 2.094 ± 0.34
LA 1.257 2.542 1.776 ± 0.19 1.330 2.290 1.730 ± 0.19 0.00032 0.00307 0.00122 ± 0.0004 4.117 9.444 6.267 ± 0.92 1.254 3.519 2.108 ± 0.34
RL 1.176 2.074 1.555 ± 0.15 0.807 1.693 1.154 ± 0.13 0.00050 0.00468 0.00155 ± 0.0006 3.205 5.959 4.344 ± 0.42 0.724 2.489 1.350 ± 0.27
LL 1.151 2.170 1.591 ± 0.15 0.815 1.770 1.161 ± 0.141 0.00050 0.00482 0.00155 ± 0.0006 3.206 6.099 4.409 ± 0.43 0.709 2.615 1.187 ± 0.28
Total (N = 154) RA 0.985 2.681 1.67 ± 0.19 1.082 2.197 1.630 ± 0.14 0.00031 0.00301 0.00105 ± 0.0003 3.500 8.865 5.886 ± 0.70 0.772 3.471 1.879 ± 0.32
LA 0.998 2.542 1.66 ± 0.19 1.053 2.290 1.639 ± 0.15 0.00032 0.00307 0.00106 ± 0.0003 2.117 9.444 5.880 ± 0.77 0.767 3.519 1.893 ± 0.33
RL 0.919 2.074 1.47 ± 0.14 0.733 1.693 1.096 ± 0.12 0.00024 0.00482 0.00131 ± 0.0005 2.644 5.959 4.113 ± 0.40 0.506 2.489 1.214 ± 0.24
LL 0.919 2.170 1.51 ± 0.15 0.733 1.770 1.101 ± 0.14 0.00024 0.00468 0.00131 ± 0.0005 2.644 6.099 4.177 ± 0.41 0.506 2.615 1.248 ± 0.24

Descriptive statistics of shape indices for Caucasian bleak (right otolith) except Ellipticity; both right (R) and left (L) otolith pairs

Class I Class II Total
Shape Indices/Otoliths (Mean ± SD) Asteriscus Lapillus Asteriscus Lapillus Asteriscus Lapillus
Aspect Ratio 1.015 ± 0.06 1.347 ± 0.09 1.036 ± 0.07 1.352 ± 0.07 1.023 ± 0.06 1.349 ± 0.08
Form Factor 0.702 ± 0.06 0.897 ± 0.02 0.656 ± 0.06 0.891 ± 0.02 0.684 ± 0.07 0.894 ± 0.02
Roundness 0.873 ± 0.07 0.710 ± 0.04 0.844 ± 0.09 0.705 ± 0.04 0.862 ± 0.08 0.708 ± 0.04
Circularity 18.036 ± 1.69 14.011 ± 0.25 19.340 ± 1.96 14.105 ± 0.29 18.544 ± 1.90 14.048 ± 0.27
Rectangularity 1.717 ± 0.22 0.841 ± 0.14 2.022 ± 0.29 1.004 ± 0.24 1.837 ± 0.20 0.905 ± 0.20
Ellipticity 0.007 ± 0.03 0.147 ± 0.03 (R) 0.016 ± 0.03 0.149 ± 0.03 (R) 0.011 ± 0.03 1.147 ± 0.03 (R)
1.826 ± 0.16 (L) 1.967 ± 0.17 (L) 1.880 ± 1.17 (L)

Classification matrices for predicted group membership of A. escherichii according to otolith shape

Length Classes Predicted Group Membership*
Class I Class II
% Class I 81.9 18.1
Class II 23.3 76.7
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Język:
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