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Fig. 2 in Conservation status and bio-ecology of Brycon orbignyanus (Characiformes: Bryconidae), an endemic fish species from the Paraná River basin (Brazil) threatened with extinction

Fig. 2. Abundance (captures per unit of effort – CPUE) of Brycon orbignyanus observed in the Upper Paraná River floodplain in different years (1986 to 1988, 1992 to 1994 and 2000 to 2010) and subsystems (Paraná, Baía and Ivinhema).

Fig. 4 in Conservation status and bio-ecology of Brycon orbignyanus (Characiformes: Bryconidae), an endemic fish species from the Paraná River basin (Brazil) threatened with extinction

Fig. 4. Ontogenetic variations in the diet of Brycon orbignyanus in the Upper Paraná River floodplain. FI = fish; AI = aquatic invertebrates; TI = terrestrial invertebrates; TP = terrestrial plants; AP = aquatic plants.

Fig. 1 in Conservation status and bio-ecology of Brycon orbignyanus (Characiformes: Bryconidae), an endemic fish species from the Paraná River basin (Brazil) threatened with extinction

Fig. 1. The locations of reservoirs from which the Brycon orbignyanus occurrence was evaluated and sites sampled throughout the Upper Paraná River floodplain (the Paraná, Baía and Ivinhema River subsystems).

Fig. 3 in Conservation status and bio-ecology of Brycon orbignyanus (Characiformes: Bryconidae), an endemic fish species from the Paraná River basin (Brazil) threatened with extinction

Fig. 3. Relationships between YOY abundance (CPUE) of Brycon orbignyanus and hydrological attributes observed in the Paraná and Ivinhema subsystems. a. Interrupted flood duration (days) (> 4.5 m Paraná River and> 2.75 m Ivinhema River), b. Uninterrupted flood duration (days).

Figure 8 from: Pandakov PG, Teofilova TM, Kodzhabashev ND (2020) Status of the burbot (Lota lota L.) in the Lower Danube (Bulgaria) – a species threatened by climate change. ZooKeys 910: 143-161. https://doi.org/10.3897/zookeys.910.47866

Figure 8 Map of Bulgarian section of Danube (above) and distribution of the catches by place of landing for 2006–2018 (below) (data source: The Executive Agency of Fisheries and Aquaculture (EAFA)).

Figure 9 from: Pandakov PG, Teofilova TM, Kodzhabashev ND (2020) Status of the burbot (Lota lota L.) in the Lower Danube (Bulgaria) – a species threatened by climate change. ZooKeys 910: 143-161. https://doi.org/10.3897/zookeys.910.47866

Figure 9 Migration barriers along Iskar (left) and Yantra (right) river catchments (data source: Basin Directorate Danube Pleven 2016).

Figure 7 from: Pandakov PG, Teofilova TM, Kodzhabashev ND (2020) Status of the burbot (Lota lota L.) in the Lower Danube (Bulgaria) – a species threatened by climate change. ZooKeys 910: 143-161. https://doi.org/10.3897/zookeys.910.47866

Figure 7 Commercial catch of burbot in Bulgaria, represented by calendar years (data source: The Executive Agency of Fisheries and Aquaculture (EAFA)).

Figure 10 from: Pandakov PG, Teofilova TM, Kodzhabashev ND (2020) Status of the burbot (Lota lota L.) in the Lower Danube (Bulgaria) – a species threatened by climate change. ZooKeys 910: 143-161. https://doi.org/10.3897/zookeys.910.47866

Figure 10 Sum of days with water temperature appropriate for reproduction and egg incubation (Tw <5 °C, left) and summer stress duration (Tw >24 °C, right) per seasons (data source: Executive agency for exploration and maintenance of the Danube river (EAEMDR)).

Figure 5 from: Pandakov PG, Teofilova TM, Kodzhabashev ND (2020) Status of the burbot (Lota lota L.) in the Lower Danube (Bulgaria) – a species threatened by climate change. ZooKeys 910: 143-161. https://doi.org/10.3897/zookeys.910.47866

Figure 5 Age composition (in %) of all collected burbot (left) and for each season separate (right). On the left diagram, the upper value is the age category and lower value is the percentage of this category in total number of fish.

Figure 1 from: Pandakov PG, Teofilova TM, Kodzhabashev ND (2020) Status of the burbot (Lota lota L.) in the Lower Danube (Bulgaria) – a species threatened by climate change. ZooKeys 910: 143-161. https://doi.org/10.3897/zookeys.910.47866

Figure 1 Distribution of the burbot in Bulgaria presented via registration of the species in UTM 10 × 10 km grid (○ localities before 2002, ● localities after 2002).

Figure 3 from: Pandakov PG, Teofilova TM, Kodzhabashev ND (2020) Status of the burbot (Lota lota L.) in the Lower Danube (Bulgaria) – a species threatened by climate change. ZooKeys 910: 143-161. https://doi.org/10.3897/zookeys.910.47866

Figure 3 Length-weight relationship for all collected fish (left), and separate relationships for the both sexes (right); TL = total length and W = weight.

Figure 2 from: Pandakov PG, Teofilova TM, Kodzhabashev ND (2020) Status of the burbot (Lota lota L.) in the Lower Danube (Bulgaria) – a species threatened by climate change. ZooKeys 910: 143-161. https://doi.org/10.3897/zookeys.910.47866

Figure 2 Distribution (in %) of body length among studied burbots, as represented by 25-mm size classes.

Figure 11 from: Pandakov PG, Teofilova TM, Kodzhabashev ND (2020) Status of the burbot (Lota lota L.) in the Lower Danube (Bulgaria) – a species threatened by climate change. ZooKeys 910: 143-161. https://doi.org/10.3897/zookeys.910.47866

Figure 11 Daily water temperatures (°C) in Danube at Silistra between 01.01.2000 and 31.12.2017 (data source: Executive agency for exploration and maintenance of the Danube river (EAEMDR)).

Fig. 2 in Movement patterns and home range in Diplomystes camposensis (Siluriformes: Diplomystidae), an endemic and threatened species from Chile

Fig. 2. River sections showing movement patterns (black lines) for each of the seven individuals of Diplomystes camposensis studied. a) RT 13, b) RT 14, c) RT 52, d) RT 61, e) RT 62, f) RT 63, g) RT 67. Note that scales are different in each case. Please refer to Fig. 1 for reference to the location of these areas within the main study area (San Pedro River).

Fig. 1 in Movement patterns and home range in Diplomystes camposensis (Siluriformes: Diplomystidae), an endemic and threatened species from Chile

Fig. 1. Study area showing the main course of the San Pedro River, which has its origin in the Riñihue Lake outlet. The confluence with the Quinchilca River is located 40 kilometres downstream, forming the Calle-Calle River. Zoomed area represents kernel home range for individual RT 13. Areas in dark grey, light grey, and white correspond to estimation using 95%, 70% and 50% density, respectively.

Fig. 4 in Movement patterns and home range in Diplomystes camposensis (Siluriformes: Diplomystidae), an endemic and threatened species from Chile

Fig. 4. Relationship between body mass (g) and Kernel home range (m2). Black circles, gray squares, and white pentagons correspond to Kernel estimation with 95%, 75%, and 50% density, respectively.

Fig. 3 in Movement patterns and home range in Diplomystes camposensis (Siluriformes: Diplomystidae), an endemic and threatened species from Chile

Fig. 3. Three measures of movement of Diplomystes camposensis. The x-axis shows six individuals and the combined data during day (D) and night time (N). The y-axis shows values of a) distance from E0 (m); b) Cumulative directional movement (m), and c) Average movement (m), differentiating between displacements upstream (positive) or downstream (negative) in direction. Black squares show mean value and whiskers show standard error. Individual R 52 not included here due to the lack of night measurements.