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36 results for “Pantanal wetlands”
First-order vertebrated mortality due the 2020 wildfires in the Pantanal wetland, Brazil
We conducted ground surveys along line transects to estimate the first-order impact of the 2020 wildfires on vertebrates in the Pantanal wetlands, Brazil. We adopted the distance sampling technique (Burnham et al 1980) to estimate the densities and the number of dead vertebrates in the 39,030 square kilometers affected by fire. We covered 123 transects scattered in the floodplain, up to 72 hours after the fires, mostly within 24 or 48 hours. We recorded the perpendicular distance between each carcass found in the field and the line transect. The carcasses were identified at least at Order level, down to species level when possible. The surveys were conducted from August to November 2020.
Fig. 4 in Distributions and phylogeographic data of rheophilic freshwater fishes provide evidences on the geographic extension of a central-brazilian amazonian palaeoplateau in the area of the present day Pantanal Wetland
Fig. 4. Haplotype network showing the occurrence of three groups (upper rio Xingu, upper rio Paraguay and upper rio Tapajós). Traces show the number of mutational steps from two adjacent haplotypes. Circle diameters are proportional to the number of individuals, which each haplotype and the colors represent the locality were those haplotypes were found. Upper rio Xingu= Pink (1: dark pink); upper rio Paraguay = Blue (2: light blue; 3: navy blue; 4: dark blue; 5: light pink; 6: orange; 7: light purple; 8: dark purple; 9: white; 10: yellow; 11: light green; 12: dark green); and upper rio Tapajós= Gray (13: light gray and 14: dark gray).
Fig. 3 in Distributions and phylogeographic data of rheophilic freshwater fishes provide evidences on the geographic extension of a central-brazilian amazonian palaeoplateau in the area of the present day Pantanal Wetland
Fig. 3. Phylogenetic tree showing relationships among major lineages of Jupiaba acanthogaster from the upper rio Paraguay, upper rio Tapajós and upper rio Xingu, obtained by a maximum likelihood partitioned analysis. Numbers at each of the main nodes represents percentage of bootstrap support obtained by maximum parsimony analysis (1000 bootstrap pseudoreplicates).
Fig. 2 in Distributions and phylogeographic data of rheophilic freshwater fishes provide evidences on the geographic extension of a central-brazilian amazonian palaeoplateau in the area of the present day Pantanal Wetland
Fig. 2. Distribution of sampled localities for Jupiaba acanthogaster in the upper rio Paraguay, rio Tapajós and rio Xingú basins. The drainages of the rio Tocantins, rio Araguaia and upper rio Paraná are also illustrated. Drainage boundaries delimited by a continuous black line.
Fig. 1 in Distributions and phylogeographic data of rheophilic freshwater fishes provide evidences on the geographic extension of a central-brazilian amazonian palaeoplateau in the area of the present day Pantanal Wetland
Fig. 1. Map of the upper rio Paraguay basin and adjoining areas showing the distribution of Leporinus octomatulatus, Jubiaba acanthogaster, Oligosarcus perdido, Moenkhausia cosmops, and Hypostomus cochliodon, exemplifying distributional pattern discussed in this paper.
Figs 3-6 in Nest support plants and breeding season of two ibis (Theristicus) species in the Pantanal wetland, Brazil
Figs 3-6. Records with evidences of breeding activities of the Plumbeous Ibis (Theristicus caerulescens) obtained in the Brazilian Pantanal wetland: 3, two adults building a nest at Poconé, MT (photo by Eric Gallardo); 4, an incubating adult at Poconé, MT (photo by Ademir Carletti); 5, an adult and a nestling in a nest at Corumbá, MS (photo by Leonardo Merçon/Instituto Últimos Refúgios); 6, an adult feeding a young on the ground at Poconé, MT (photo by Maria Beatriz Felgar de Toledo). Records were gathered in the WikiAves database.
Figs 7-10 in Nest support plants and breeding season of two ibis (Theristicus) species in the Pantanal wetland, Brazil
Figs 7-10. Records with evidences of breeding activities of the Buff-necKed Ibis (Theristicus caudatus) obtained in the Brazilian Pantanal wetland: 7, two adults and a nest being built at Poconé, MT (photo by Ronaldo Duarte); 8, an incubating adult at Poconé, MT (Photo by Antonio Carlos Iglesias); 9, a young being cared in a nest at Miranda, MS (Photo by Suzana Maria Salis); 10, two young with adults in a nest at Aquidauana, MS (Photo by Ana Aquino). Records were gathered in the WikiAves database, except for Fig. 9.
Fig. 1 in Nest support plants and breeding season of two ibis (Theristicus) species in the Pantanal wetland, Brazil
Fig. 1. Municipalities in which records (photographs) with evidences of breeding activities of two ibis species (Theristicus caerulescens and T. caudatus) were obtained by us and citizens between 2007 and 2019 in the Brazilian Pantanal (gray area). Taquari river divides this Brazilian wetland in two portions: that of Mato Grosso state (where Poconé is located) and that of Mato Grosso do Sul state (where Corumbá, Miranda and Aquidauana are located).
Fig. 2 in Nest support plants and breeding season of two ibis (Theristicus) species in the Pantanal wetland, Brazil
Fig. 2. Seasonal occurrence of records of breeding activities of two ibis species (Theristicus caerulescens and T. caudatus) in the Brazilian Pantanal wetland, based on records (photographs) obtained during our field observations, and bY citizens, between 2007 and 2019. Data bY citizens was gathered in the WikiAves and eBird databases in March 2020. The horizontal bars in light and dark blue colors indicate the length of the dry and rainy seasons in the Pantanal, respectively.
Figure 1 in Characterization of shelters of the giant otter (Pteronura brasiliensis, Mammalia, Carnivora, Mustelidae) in the pantanal wetlands, state of Mato Grosso, Brazil
Figure 1. Demarcation of shelters (dens and campsites) and latrines of giant otter in Espírito Santo Creek, Natural Heritage Private Reserve, SESC Pantanal, municipality of Barão de Melgaço, northern portion of Pantanal, state of Mato Grosso, Brazil.
Figure 2 in The Pantanal is on fire and only a sustainable agenda can save the largest wetland in the world
Figure 2. Wildfire in Pantanal: 1 – firefighter; 2, 3 – burned area; 4, 5, 6 - dead animals.
Figure 1. Pantanal burned area per year until 9 in The Pantanal is on fire and only a sustainable agenda can save the largest wetland in the world
Figure 1. Pantanal burned area per year until 9/25/2020.
Data from: Seasonal population and individual niche dynamics in a tetra fish in the Pantanal wetlands
In seasonal tropical regions, rainfall and/or temporary floods during the wet season generally increase the abundance and diversity of food resources to many consumers as compared to the dry season. Therefore, seasonality can affect intraspecific competition and ecological opportunity, which are two important ecological mechanisms underlying population and individual niche variations. Here, we took advantage of the strong seasonality in the Pantanal wetlands to investigate how within- and between-individual diet variations relate to seasonal population niche dynamics of the tetra fish Astyanax lacustris. We quantified dietary niche using gut contents and stable isotopes. Tetras had higher gut fullness and better body condition in the wet season, suggesting that competition is more intense in the dry season. The population niche was broader in the wet season due to an increase in diet divergence between individuals, in spite of potential stronger competition in the dry season. We posit that low ecological opportunity in the dry season limits the diversifying effect of intraspecific competition, constraining population niche expansion. Our results add new insights on how seasonality affects population and individual diets, indicating that intraspecific competition and ecological opportunity interact to determine temporal niche variations in seasonal environments.
FIGURE 5 in A new species of Argulus (Crustacea, Branchiura, Argulidae) from the skin of catfish, with new records of branchiurans from wild fish in the Brazilian Pantanal wetland
FIGURE 5. DETAILS Of ALLOTyPE Of Argulus chiropteroideus sp. n. fEMALE, IN VENTRAL VIEW. A–D LEGS 1 TO 4 E fRONTAL REGION F SPINES Of THE fRONTAL REGION G fIRST ANTENNAE H SEcOND ANTENNAE I SUPPORT RODS Of SUcTION cUP (fIRST MAXILLAE) J SEcOND MAXILLAE, WITH ANTERIOR AND POSTERIOR THORAcIc SPINE (EMPHASIZED ARE THE ScALES) K LAST SEGMENT Of SEcOND MAXILLAE L AbDOME M SEMEN PAPILLAE N cAUDAL RAMI IN DORSAL VIEW O MOUTH TUbE AND PREORAL STyLET P MOUTH TUbE Q MANDIbLE AND R RESPIRATORy AREA. ScALE bAR = A–D, R 2MM, O 1.5MM, L 1MM, E, G–H, J 0.5MM, K, P 0.25MM, I, M, N 0.2MM, F, Q 0.1MM
FIGURE 4 in A new species of Argulus (Crustacea, Branchiura, Argulidae) from the skin of catfish, with new records of branchiurans from wild fish in the Brazilian Pantanal wetland
FIGURE 4. ALLOTyPE Of Argulus chiropteroideus sp. n. fEMALE. A DORSAL AND B VENTRAL VIEW. ScALE bAR = 2.5MM
FIGURE 1 in A new species of Argulus (Crustacea, Branchiura, Argulidae) from the skin of catfish, with new records of branchiurans from wild fish in the Brazilian Pantanal wetland
FIGURE 1. HOLOTyPE Of Argulus chiropteroideus sp. n. MALE. A DORSAL AND B VENTRAL VIEW. ScALE bAR = 1.5MM
FIGURE 8. Argulus nattereri. A–N MALE, O–Q fEMALE. A DORSAL AND B VENTRAL VIEW C in A new species of Argulus (Crustacea, Branchiura, Argulidae) from the skin of catfish, with new records of branchiurans from wild fish in the Brazilian Pantanal wetland
FIGURE 8. Argulus nattereri. A–N MALE, O–Q fEMALE. A DORSAL AND B VENTRAL VIEW C DORSAL VIEW Of THE ANTERIOR REGION (ARROWS POINTING NAKED SETAE) D fIRST AND SEcOND ANTENNAE (WHITE ARROWS POINTING POSTANTENNAL SPINES, THE POWERfUL AND AcUTE SPINE ARISING fROM THE cARAPAcE AND SPINES ON THE VENTRAL SIDE Of cARAPAcE; bLAcK ARROWS POINTING THE SENSORIAL STRUcTURES Of fIRST AND SEcOND ANTENNAE) E SUcTION cUP F SUPPORT RODS Of SUcTION cUP G PREORAL STyLET (ARROWS SHOWING THE EXTREMITy Of THE STyLET) H bASAL PLATE Of SEcOND MAXILLAE (bLAcK ARROWS SHOWING TWO bIG AND AbOUT fIVE SMALL STOUT, SIMPLE SETAE ON PAD, AND THE THORAcIc AccESSORy SPINES; WHITE ARROWS SHOWING A cOARSE PEcTINATE ScALE) I MOUTH TUbE (ARROWS POINTING ScALES AND SENSILLA) J MANDIbLES WITHIN THE MOUTH TUbE K fIRST L SEcOND (DORSAL VIEW) AND M THIRD AND fOURTH LEGS (ARROWS SHOWING fLAGELLUM; S: SOcKET; P: PEG) N TAcTILE PAPILLAE O DORSAL AND P VENTRAL VIEW Q fIRST AND SEcOND LEGS (ARROWS SHOWING cOARSE-PEcTINATE ScALES. ScALE bAR = 1.0MM (A, B, O, P), 0.25MM (C, E, G, H, I, N), 0.1 (F, J, Q) 0.05MM (D, K, L, M)
FIGURE 3 in A new species of Argulus (Crustacea, Branchiura, Argulidae) from the skin of catfish, with new records of branchiurans from wild fish in the Brazilian Pantanal wetland
FIGURE 3. Argulus chiropteroideus sp. n. MALE. A, N DORSAL VIEW B–M VENTRAL VIEW. C SUcTION cUPS AND PREORAL STyLET D ANTERIOR REGION (ARROWS SHOWING LATERAL SENSORIAL STRUcTURE Of THE fIRST ANTENNAE) E THORAX IN VENTRAL VIEW F ScALES Of THE THORAX G POST ANTENNAL SPINES H SEcOND MAXILLAE (IN DETAIL ScALES Of THE THIRD SEGMENT) I fIfTH SEGMENT Of THE SEcOND MAXILLAE (SE: SENSILLIUM) J–K fIRST AND SEcOND LEGS (ARROWS SHOWING THE VENTRAL PAPILLAE AT DISTAL POSTERIOR REGION Of bASES) L bILObATE STRUcTURE Of cOXAE Of SEcOND LEGS M–N THIRD AND fOURTH LEGS (WHITE ARROW SHOWING THE PADDLE-LIKE EXTENSION; bLAcK ARROW SHOWING THE bONE SHAPED LObE fROM JOINT bETWEEN cOXA AND bASIS; GREy ARROW SHOWING THE ScALES IN THE fLESHy LObE DORSALLy; S: SOcKET) O fOURTH LEG (P: PEG) P cAUDAL RAMI. ScALE bAR = A, B 1MM, C, M 0.25MM, D, G, L, N, O, P 0.1MM, E, H, I, J, K 0.05MM, F 0.01MM
FIGURE 2 in A new species of Argulus (Crustacea, Branchiura, Argulidae) from the skin of catfish, with new records of branchiurans from wild fish in the Brazilian Pantanal wetland
FIGURE 2. DETAILS Of HOLOTyPE Of Argulus chiropteroideus sp. n. MALE IN VENTRAL VIEW. A–B, D–E LEGS 1 TO 4 (VENTRAL VIEW) C LEG 3 (DORSAL VIEW) F fRONTAL REGION G fIRST ANTENNAE H SEcOND ANTENNAE I SUPPORT RODS Of SUcTION cUP (SEcOND MAXILLAE) J SEcOND MAXILLAE, WITH ANTERIOR, POSTERIOR THORAcIc SPINES AND EMPHASIZED ARE THE ScALES K LAST SEGMENT Of SEcOND MAXILLAE L AbDOMEN M ANAL PAPILLAE (DORSAL VIEW) N MOUTH TUbE AND PREORAL STyLET O MOUTH TUbE P MANDIbLE Q RESPIRATORy AREA. ScALE bAR = A–E,Q 1MM, F 0.5MM, J,L, G–J, N 0.2MM, K, M, O–P 0.1MM
FIGURE 10. Dolops carvalhoi. A in A new species of Argulus (Crustacea, Branchiura, Argulidae) from the skin of catfish, with new records of branchiurans from wild fish in the Brazilian Pantanal wetland
FIGURE 10. Dolops carvalhoi. A ScALES (ARROW) Of fOURTH LEG Of fEMALE B ANAL PAPILLAE Of fEMALE C SETA-LIKE STRUcTURE (ARROW) IN THE fIRST MAXILLAE Of THE MALE D SPINES Of SEcOND MAXILLAE AND THORAcIc SPINE Of MALE. ScALE bAR = A 0,15MM, B 0.5MM, C–D 0.25MM
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