Table 1. Sampling localities, basins, latitude, longitude, mean summer air temperature 1961-1990 (Temp, data from Servicio Meteorológico Nacional, Argentina, www.smn.gov.ar), species identification, and SL of Odontesthes specimens used in this study. All river drainages flow to the Atlantic, unless otherwise noted (Pacific). OB: O. bonariensis, OH: O. hatcheri, Hy: presumptive hybrids, showing key characters of both species; CA: Cluster Analysis; GMA: Geometric Morphometrics Analysis; N: number of specimens. In bold, differences between key, genetic, and morphological criteria. Presumptive hybrids were highlighted as * in Fig. 3 and bold characters in Table 2.
| Sampling locality and river basin | Latitude (S) Longitude (W) | Temp (ºC) | Species based on key characters (N) | Species based on mtDNA (N) | Species based on CA applied to GMA data (N) | SL (cm) (mean and range) |
|---|
| ULLM, Ullum Reservoir, Colorado basin | 31º28’ 68º40’ | 22 | OB (25) | OB (1) | OB (25) | 8.83 (6.06-14.14) |
|---|
| CARZ, El Carrizal Reservoir, Colorado basin | 33°20’ 68°43’ | 22 | OB (30) | OB (1) | OB (30) | 17.00 (13.62-30. 90) |
|---|
| NIHL, El Nihuil Reservoir, Colorado basin | 35°04’ 68°45’ | 22 | OH (12) | OB (2) OH (7) | OH (12) | 7.44 (4.85-9.71) |
|---|
| D, Lake San Lorenzo; Salado del Sur basin | 36°5’ 58° 1’ | 20-22 | OB (34) | OB (2) | OB (34) | 19.66 (15.54-23.98) |
|---|
| URRE, Lake Urre Lauquen; Colorado basin | 38°5’ 65°50’ | 22-24 | OB (6) | OB (2) OH (4) | OB (4) OH (1) | 12.48 (7.05-16.35) |
|---|
| CDP, Casa de Piedra Reservoir, Colorado basin | 38°15’ 67°30’ | 22-24 | OB (1) OH (8) | OB (1) OH (7) | OB (1) OH (8) | 7.75 (3.92-26.58) |
|---|
| PELE, Lake Pellegrini; Negro basin | 38°41’ 67°59’ | 22 | Hy (26) OH (19) | OB (5) OH (18) | OB (6) OH (36) | 27.51 (22.32-39.40) |
|---|
| PDA, Piedra del Aguila Reservoir; Negro basin | 40° 24’ 70° 6’ | 16-18 | OH (30) | | OH (30) | 9.46 (12.20-7.80) |
|---|
| MITO, Lake Morenito; Negro basin | 41°03’ 71°31’ | 12-14 | OH (27) | OH (6) | OH (27) | 31.37 (21.77-38.00) |
|---|
| CARI, Lake Carilafquen Chica; endorheic basin | 41°12’ 69° 25’ | 16-18 | OH (24) | OH (2) | OH (24) | 20.93 (26.70-14.03) |
|---|
| EPU, Lake Epuyen; Puelo basin (Pacific) | 42°10’ 71° 31’ | 12-14 | OH (6) | OH (11) | OH (6) | 5.02 (4.14-5.63) |
|---|
| RIV, Lake Rivadavia; Futaleufú basin (Pacific) | 42°30’ 71°45’ | 12-14 | OH (28) | OH (11) | OH (28) | 7.21 (6.49-7.80) |
|---|
| ROS, Lake Rosario; Futaleufú basin (Pacific) | 43°15’ 71°20’ | 12-14 | OH (27) | OH (3) | OH (27) | 28.49 (15.91-33.09) |
|---|
| AME, Florentino Ameghino Reservoir, Chubut basin | 43°42’ 66°29’ | 18-20 | OH (15) | OB (2) OH (7) | OH (15) | 17.75 (13.17-32.90) |
|---|
| CHU, Chubut River (Los Altares); Chubut basin | 43°51’ 68°48’ | 18 | OH (29) | OH (11) | OH (28) | 8.04 (5.15-11.26) |
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| MUS, Lake Musters; Chubut basin | 45°28’ 69°10’ | 16-18 | OH (25) | OH (11) | OH (25) | 11.68 (5.70-22.94) |
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| LBA, Lake Buenos Aires; Aysen basin (Pacific) | 46°29’ 71°28’ | 14 | OH (36) | OH (23) | OH (36) | 17.59 (8.91-27.17) |
|---|
| PUY, Lake Pueyrredón; Baker basin (Pacific) | 47°23’ 71°55’ | 12-14 | OH (29) | OH (12) | OH (29) | 14.15 (9.24-39.05) |
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