Pantanal Wetland Research Articles

Land use and regulating ecosystem services scenarios for the Brazilian Pantanal and its surroundings under different storylines of future regional development

AbstractThe Pantanal, the largest worldwide continuous wetland, is considered a global hotspot of ecosystem services. Based on process‐based modeling, we assessed plausible scenarios of land use for the Brazilian Pantanal wetland and its surrounding highlands by the year 2050. The simulations indicate likely trajectories of land‐use change and the corresponding consequences for ecosystem services by looking specifically at soil loss, sediment yield, water quality, and carbon storage. The “Economy based on sustainable principles” scenario, in which landowners maintain native vegetation above Brazilian law requirements can lead to large reductions in soil losses and sediment yield (45%), whereas an increase in nutrients retention efficiency of soils (2%) and above‐ground carbon storage (7%) compared to the reference scenario of “Business as usual” (BAU). On the other hand, the scenario of “Accelerating anthropogenic changes” might lead to an increase in soil losses (8%) and sediment yield (11%), with a reduction in the efficiency of soil nutrients retention (3%) and carbon storage (15%). This study illustrates that the enhanced awareness of future potential impacts can pave the way for less harmful decisions in the mid‐term, toward the adoption of suitable strategies aligned with sustainable practices. Based on this, we discussed several initiatives that demonstrate the feasibility of moving toward most collective desirable scenarios.

Cross-Boundary Drivers of Water Cover Reduction in the Pantanal Wetland and Implications for its Conservation

Cross-Boundary Drivers of Water Cover Reduction in the Pantanal Wetland and Implications for its Conservation

Molecular detection of Hepatozoon spp. and Cytauxzoon felis in wild carnivorans and domestic dogs in southern Pantanal wetlands of Brazil with new host records.

Molecular detection of Hepatozoon spp. and Cytauxzoon felis in wild carnivorans and domestic dogs in southern Pantanal wetlands of Brazil with new host records.

Correction to: Dryer Pantanal wetlands may increase Leucaena leucocephala (Fabaceae) invasion

Correction to: Dryer Pantanal wetlands may increase Leucaena leucocephala (Fabaceae) invasion

Ten relevant questions for applying biodiversity offsetting in the Pantanal wetland

AbstractIn Brazil, biodiversity offsetting operates in an ad hoc manner while biodiversity equivalence has mainly been overlooked by public policies. Despite being mandatory since 1965s Forest Code (Law 4.771), we fail to have a robust offsetting framework. The revision of the forest code in 2012 (i.e., Native Vegetation Protection Law—NVPL—Law n° 12,651/2012), maintained the obligation for landowners to set aside a biome‐specific percentage of their native vegetation for preservation. Known as Legal Reserves, these set‐asides are a precondition for compliance with NVPL's regularization procedure called CAR (Rural Environmental Cadaster). Despite enthusiasm about biodiversity offsetting opportunities following the NVPL enactment in 2012, uncertainties around its implementation remains. Here, we formulated 10 questions that discuss and illustrate how offsetting can be applied to maintain wetland integrity, economic fairness and biodiversity conservation in the Pantanal and Upper Paraguay River basin (UPRB). The aim is to stimulate robust public policies and stimulate wetland offsetting research opportunities. We provided examples of implementation opportunities of the NVPL in integrating the floodplain and highland in Pantanal at UPRB, analyze spatial compliance deficits, and illustrate opportunities that require harmonized legislation and policies between Mato Grosso and Mato Grosso do Sul states in Brazil.

Seed morphology of five Aeschynomene (Fabaceae) species from Pantanal

Seed shape, dimensions, surface texture, sculpture, hilum shape, and position were recorded for five Aeschynomene L. species (Fabaceae): A. denticulata, A. fluminensis, A. histrix, A. rudis, and A. sensitiva from Pantanal, Brazil, using a scanning electron microscope. The five species shared similar seed characteristics such as shape, color, surface, apex and base, face and side, hilar fissure, hilar sculpture and color, aril sculpture and color, micropylar pore position, and testa sculpture. Seed species differed in measurements (seed length and width, hilum length and width, and aril elevation). The hilum exhibited the position, shape, microsculpture, periclinal wall, and secondary sculpture of the testa, which are typical of some species. Two patterns were recognized based on the hilum shape, hilar area, and five hilum microsculpture surface patterns. Four patterns were recognized based on the testa periclinal wall, and three patterns were recognized based on the testa secondary sculpture. The results proved the potential taxonomic value of the recorded characteristics, as indicated by the richness of variation recorded in a limited sample of Aeschynomene species in the Pantanal wetland.

Wildfire ashes: evaluating threats on the Pantanal wetland reserve (Mato Grosso, Brazil) using ecotoxicological tests.

In 2020, the largest continuous wetland area on the planet, the Brazilian Pantanal, experienced an unprecedented fire that affected the entire ecosystem. Our goal was to elucidate the effects of ash presence following the fire events. We quantified the impact of ashes, collected in four Conservation Units, on soil, water, and atmosphere. On the edaphic system, we tested the impact through behavioral and acute toxicity tests using annelids exposed to contaminated soil at different ash concentrations. We assessed the effect of ash on the flux of soil greenhouse gases. In the water, we examined the impact through tests with the Daphnia similis Claus, 1876. On the edaphic system, Eisenia andrei (Bouché, 1972) exhibited reduced average mortality rates and negative sublethal responses, including behavioral and morphological changes. Annelids displayed rejection responses to the ash substrate, suggesting potential damage to soil function. D. similis showed high mortality rates. We noted an increase in carbon dioxide emissions after ash addition. Changes in soil characteristics were also observed, mainly an increase in minerals. Considering the escalating frequency and intensity of fires in tropical areas due to climate change and deforestation, our findings contribute to understanding the potential ecotoxicological impact of ash in wetlands.

Nutrient stock in the water hyacinth Eichhornia crassipes (Mart) Solms, in the Chacororé-Sinhá Mariana Lake System, Pantanal Biosphere Reserve, Mato Grosso, Brazil

The Pantanal wetland in Mato Grosso state, have their dynamics and functioning particularly related to the flood pulse, in these environments, aquatic macrophytes play an important role in the cycling and storage of nutrients due to the large amount of biomass and nutrientes they accumulate. The samples were collected at three samples points: Chacororé Lake, Sinhá Mariana Lake and the transition between them. The aim of this study was to analyze the stock of nutrients in E. crassipes in the Cacororé-Sinhá Mariana Lake System. The total concentration of nutrients in the biomass of E. crassipes obeyed the following orders in Chacororé, in the dry season K >N >P >Mg >Na > Ca in the flood N > K > Mg > P > Na > Ca in Sinhá Mariana/Mutum in the dry season K > N > P > Mg > Na > Ca and in the flood K > N > Mg > P > Ca > Na, and in Sinhá Mariana/Chacororé in the dry season K > Mg > N > P > Ca > Na, in the flood K > N > Mg > P > Ca > Na. It was clear that K and N were the nutrients with the highest concentrations in the biomass of E. crassipes. This research corroborates other studies carried out in the Pantanal on the importance of the flood pulse in the stock and release of nutrients.

Characterization of the Elemental Composition of Aerosols Emitted in the Dry Season of the Pantanal Wetland, Brazil

The Brazilian Pantanal region experiences intense biomass burning during the dry season, releasing large quantities of gasses and particles into the atmosphere, which have serious implications on both the climate system and public health. Understanding the dynamics of these emissions is crucial for mitigating the impact on the ecosystem, its functioning, and potential anthropogenic disturbances. This study focused on analyzing emissions in the northern Pantanal during the 2022 drought. Concentrations of fine particulate matter (PM2.5), black carbon (BC), and 25 chemical elements were measured using gravimetry, reflectance analysis, and X-Ray fluorescence, respectively, from samples collected between August and October 2022. The average concentrations of PM2.5 and BC increased approximately 4-fold and 2.5-fold, respectively, compared to averages from a decade ago. Significant increases were also observed in elements such as sulfur (S), potassium (K), iron (Fe), and silicon (Si). The maximum concentrations were comparable to values typical of the southern Amazon, a region known for high deforestation rates and land use changes. Elemental analysis revealed substantial shifts in concentrations, primarily associated with biomass burning (BB) and soil suspension. Additionally, enrichment factor (Ef) analysis showed that lead (Pb) levels, correlated with human activities, were 200 times higher than those found under clean atmospheric conditions.

Limited open information sharing and mobility promotes sustainability of jaguar tourism in Pantanal wetland, Brazil

Wildlife tourism plays a crucial role in biodiversity conservation. However, long-term sustainability is difficult to achieve. In this paper, we use property theory to produce a mathematical model that aims to better support stakeholders from the wildlife tourism industry to better guarantee a balance between sightings probability, tourists’ overall experience and operators’ sharing behaviour. We illustrate our model with the case study of Porto Jofre in the Pantanal wetland, Brazil. We show that while dealing with low sighting probability, tourist operators must share information about species’ locations, leading to a system of open access regarding mobility and information. However, when sightings become common, sharing must be restricted to a bounded group avoiding overcrowding, a system of limited open access. Finally, when the sighting probability is high, no sharing is needed to achieve maximum overall experience. Our case study in Porto Jofre, Pantanal, Brazil, clearly shows these shifts in terms of governance strategies. We show that by looking at sighting probability it is possible to predict the best optimal social strategy that will guarantee long-term sustainability of the wildlife tourism initiatives. We also show the need for external support on adaptation in cases where current strategies do not match the predicted ones.

Spatial modelling and estimation of mammals' mortalities by Pantanal 2020 megafires

Abstract Extreme wildfire events, such as the Pantanal 2020 megafires, are expected to become more common. Assessing the impacts of such extreme events on wildlife is imperative for conservation planning. Direct observation of carcasses can provide valuable information on how these impacts relate to spatial heterogeneity. Here, we use double‐observer carcass surveys to assess the numbers and spatial patterns of direct mortalities of medium‐ to large‐sized mammals resulting from the Pantanal 2020 megafires in a large reserve (1080 km2) in the northern Pantanal wetland. Accounting for imperfect detection, we model the spatial variation in mortality occurrence and abundance, testing the effects of habitat‐related variables and wildfire severity using multi‐species N‐mixture models. We found that 26 out of 27 species of medium and large‐sized mammals died from the fires with a mean estimate of around 49 thousand individuals. The most affected species included capuchin monkeys, agoutis, peccaries, tapirs, brocket deer, tamanduas, coatis and capybaras. Direct mortality of mammals by wildfires was affected by landscape factors related to species habitats, species traits (probably related to escape or refuge strategies), and the intensity of the wildfires. Mortalities presented a general positive relationship with non‐flooded forests (a fire‐sensitive habitat in Pantanal) and with the severity of wildfires. Artificial water bodies, a common landscape structure in Pantanal, had 7.5 times more deaths than other areas. Synthesis and applications: With the approach used, we were able to: (i) identify mortality hotspots associated with landscape features; (ii) simultaneously identify the most affected species and assess the average relationships for all the assemblage of medium‐ and large‐sized mammals. We discuss conservation and management actions in two contexts: species prioritization for rescuing and monitoring; and territory prioritization for fire prevention and fighting.

Automated detection of regions with persistently enhanced methane concentrations using Sentinel-5 Precursor satellite data

Abstract. Methane (CH4) is an important anthropogenic greenhouse gas, and its rising concentration in the atmosphere contributes significantly to global warming. A comparatively small number of highly emitting persistent methane sources are responsible for a large share of global methane emissions. The identification and quantification of these sources, which often show large uncertainties regarding their emissions or locations, are important to support mitigating climate change. Daily global column-averaged dry air mole fractions of atmospheric methane (XCH4) are retrieved from radiance measurements of the TROPOspheric Monitoring Instrument (TROPOMI) on board on the Sentinel-5 Precursor (S5P) satellite with a moderately high spatial resolution, enabling the detection and quantification of localized methane sources. We developed a fully automated algorithm to detect regions with persistent methane enhancement and to quantify their emissions using a monthly TROPOMI XCH4 dataset from the years 2018–2021. We detect 217 potential persistent source regions (PPSRs), which account for approximately 20 % of the total bottom-up emissions. By comparing the PPSRs in a spatial analysis with anthropogenic and natural emission databases, we conclude that 7.8 % of the detected source regions are dominated by coal, 7.8 % by oil and gas, 30.4 % by other anthropogenic sources like landfills or agriculture, 7.3 % by wetlands, and 46.5 % by unknown sources. Many of the identified PPSRs are in well-known source regions, like the Permian Basin in the USA, which is a large production area for oil and gas; the Bowen Basin coal mining area in Australia; or the Pantanal Wetlands in Brazil. We perform a detailed analysis of the PPSRs with the 10 highest emission estimates, including the Sudd Wetland in South Sudan, an oil- and gas-dominated area on the west coast in Turkmenistan, and one of the largest coal production areas in the world, the Kuznetsk Basin in Russia. The calculated emission estimates of these source regions are in agreement within the uncertainties in results from other studies but are in most of the cases higher than the emissions reported by emission databases. We demonstrate that our algorithm is able to automatically detect and quantify persistent localized methane sources of different source type and shape, including larger-scale enhancements such as wetlands or extensive oil- and gas-production basins.

A Case Study of the Possible Meteorological Causes of Unexpected Fire Behavior in the Pantanal Wetland, Brazil

This study provides insights into large fires in the Pantanal by analyzing the atmospheric conditions that influenced the rapid fire evolution between 13 and 14 November 2023, when fire fronts spread rapidly, leading to critical situations for firefighters. The observation-based analysis helped us to identify some characteristics of the fire’s evolution and the meteorological conditions in the region. Furthermore, two simulations were run with the Meso-NH model, which was configured with horizontal resolutions of 2.5 km and 5 km. The fire behavior, characterized by satellite observations, revealed periods with a sudden increase in active fire numbers. High temperatures and low relative humidity in the region characterized the fire weather conditions. The simulations confirmed the critical fire condition, showing the benefits of increasing the resolution of numerical models for the Pantanal region. The convection-resolving simulation at 2.5 km showed the repeated development of gust fronts in the late afternoon and early evening. This study highlights this dynamic that, coupled with intense surface wind gusts, was crucial for the intensification of the fire spread and unexpected behavior. This study is a first step toward better understanding fire dynamics in the Pantanal through atmospheric modeling, and it can support strategies for firefighting in the region.

Invasive wild boar affected feral hog skull evolution over 25 years in Brazilian Pantanal wetland

Abstract The morphological plasticity of the Sus scrofa wild–domestic species complex is evident in both free-ranging morphotypes and domestic breeds. The Brazilian Pantanal feral hog (“porco-monteiro”) evolved after a long-term feralization process and represents a significant proportion of the mammalian biomass in the region. Its coexistence with native fauna brings several ecological impacts, which are mitigated by the Brazilian Pantanal wetland vastness and resource availability. They are a local subsistence game resource but also impact crops and pastures. Around the 2000s to mid-2010s, numerous European wild boar were introduced in Brazil to fulfill a demand for gourmet meat. Wild boar was also introduced to the Brazilian Pantanal as a game species and to breed with porco-monteiro feral hogs in a commercial venture to produce an even more exotic meat. The craze for wild boar meat has since dwindled, but their populations remain widespread and uncontrolled. Moreover, the full impact of the wild boar introduction on feral hog populations is still unknown. This study analyzes the skulls of porco-monteiro feral hogs from the 1990s, 2000s, and 2010s to assess possible morphological and functional variations along with skulls of wild boar and hybrids from Argentina, Uruguay, and Southern Brazil. The results indicate a trend of broadening of feral hog skulls at the coronal plane and a progressive reduction of the semispinalis capitis muscle scars over the decades. Biomechanical analysis denoted a decrease in head-elevation force that could affect the rooting performance of the latest feral hog morphotypes. Taken together, results show that wild boars likely influenced the evolution of the Pantanal feral hog skull. The magnitude of ecomorphological implications of these morphofunctional changes is unknown, as well as its effects in the Brazilian Pantanal wetland ecology.

The economic displacement of thousands of fishers in the Pantanal, Brazil: A telling story of small‐scale fisheries marginalization worldwide.

AbstractA new policy in the Pantanal wetland, Brazil, aims to economically displace thousands of artisanal fishers from one‐third of the region. The legislation disregards several FAO Voluntary Guidelines for Securing Sustainability in Small‐Scale Fisheries' guiding principles (SSF guidelines). Considering that 2024 marks the 10th anniversary of these guidelines, this policy represents a significant setback for fish and fisheries worldwide. In this paper, we show that the legislation is part of long‐term agenda against small‐scale fishers in the Pantanal, aiming to use narratives around overfishing to justify physical and economic displacements—albeit no empirical evidence showing impact on fish stocks. We also show that, as in many other small‐scale fisheries worldwide, overfishing narratives are, in fact, used to open space for industrial activities and large infrastructure projects. The Pantanal is a telling story of that, since the new legislation will likely open space for the construction of over 50 small hydroelectric dams in the Pantanal and surrounding area. We argue that, first, it is urgent to abolish the new legislation and promote a pro‐fishers agenda in the Pantanal to protect the region. However, since this is not unique for the region, it is critical to implement international programmes that celebrate and support local fisheries worlwide and avoid physical and economic displacements. Stands out turning SSF guidelines into international agreements, implementing citizens science programmes and expanding the fisher's tenure rights through innovative mechanizes of ownership. By better protecting local small‐scale fishers in the Pantanal and worldwide we are more likely to guarantee a sustainable future for ecosystems and its peoples.

Carbon and Nitrogen Stocks in Soil under Native Pastures in the Pantanal Wetland Biome, Brazil

The Pantanal has a high diversity of native pastures that provide food for many wild and domestic animals. Pantanal cattle raising is practiced in an extensive grazing-based system that varies according to the flood levels in the area. This study aimed to evaluate the fractions of soil organic matter in areas of native pastures under different uses and to quantify C and N stocks in sandy soils of the Pantanal. Soil samples from three native pastures differentiated by the predominance of Hymenachne amplexicaulis, Axonopus purpusii, and Mesosetum chaseae under different land use systems (continuous grazing and no grazing for five years) were collected and used to quantify the contents of carbon, nitrogen, and humic fractions. The dynamics of SOM are modified in grazed areas of the Pantanal, with influence on C and N, including their stocks. Native pastures of Axonopus purpusii and Hymenachne amplexicaulis showed an increase in organic matter after five years without grazing, while Mesosetum chaseae showed lower soil density and nitrogen levels. The highest C stock was observed in ungrazed areas of H. amplexicaulis (127.41 Mg ha−1 in the 0–40 cm layer). The dynamics of nitrogen in Pantanal pastures are influenced by the type of vegetation and land management, with higher nitrogen content in the surface layer (0–10 cm) and an increasing C/N ratio with soil depth, indicating lower nitrogen availability.

New specimens of Helicops boitata (Serpentes: Dipsadidae: Hydropsini), with data on morphological variation and behavior.

We report data on morphological variation and behavior of the recently described watersnake Helicops boitata, previously known strictly from the holotype. Our data come from five new specimens fortuitously found in a private area near the type locality, in the Brazilian Pantanal wetlands. The expanded sample revealed polymorphism in at least two scalation features previously assumed as diagnostic of the species (i.e., undivided condition of the cloacal plate and nasal scales) and confirmed the uniqueness of the ventral color pattern, as well as the divided condition of the foremost ventral shields. In addition, three individuals collected alive also exhibited the same harmless behavior reported to the holotype, a rather unusual feature among snakes of the genus Helicops. Other new behavioral observations include mostly nocturnal activity (in contrast with the previous data) and the ability to dig galleries in the soft substrate when attempting to escape. The finding of five individuals very close to each other suggest aggregations in habitats prone to retain humidity in the dry season of the Pantanal. Low abundance rates and possible habitat restrictions might render Helicops boitata particularly susceptible to seasonal fire episodes that consume large extensions of the wetlands, including temporarily dry flooding fields in which aquatic reptiles find refuge during the seasonal droughts.

Erratum: Ecological attributes of aquatic invertebrates in two water turbidity scenarios in a lake of the Pantanal, Brazil

The objective of this work was to determine the taxonomic structure and Functional Feeding Groups (FFGs) of benthic invertebrates and their roles in two different water turbidity scenarios in a floodplain lake in the Pantanal wetland (Sinhá Mariana Lake, Barão de Melgaço, state of Mato Grosso). We studied the benthic invertebrate fauna at 18 sampling sites in periods of high turbidity (HT) and low turbidity (LT) during high water (HW) and low water (LW). We hypothesize that the structure of Chironomidae assemblages (species and functional feeding groups) varies between sites in Sinhá Mariana Lake, and the density and diversity attributes of species in this family and their functional feeding groups are reduced under increased turbidity. Depth, water temperature, turbidity, pH, pCO₂, water color, and organic matter content of the sediment were analyzed in each sampling site. Chironomidae presented higher density and diversity in periods of high water (HW) in sites with low turbidity water (LT). The dominance increased in periods of low water (LW). The main FFGs were represented by collector-gatherers, while the smallest groups corresponded to shredder-herbivores (50% and 9% of the total abundance, respectively). Collector-gatherers (Aedokritus sp., Chironomus strenzkei, Goeldichironomus petiolicola, G. maculatus, Beardius phytophilus), predators (Ablabesmyia gr. annulata, Labrundinia sp. and Cryptochironomus brasiliensis) and shredder-herbivores (Asheum sp., Polypedilum sp., Polypedilum gr. fallax) predominated in high water (HW) periods. A change in the community structure from the HW to LW was evidenced, characterized by the substitution of collector-gatherers for collector-filterers. Notodiaptomus deitersi (Crustacea) was dominant in LW (dominance index = 10.9) and Aedokritus sp. (Insecta) in HW (dominance index = 5.4). Water turbidity and the hydrological cycle are important factors determining spatial and temporal patterns in communities, particularly changes in FFGs. Changes in turbidity in different sites and periods alter the structure of trophic communities and lead to questions about the main drivers of communities in Pantanal wetlands as areas of high ecological relevance for maintaining biodiversity.

Sampling Bias of Birds in the Pantanal Wetland: A Study Case with Records from Biological Collections

Sampling Bias of Birds in the Pantanal Wetland: A Study Case with Records from Biological Collections

Untangling the Defiant Taxonomy of Physaloptera (Nematoda: Chromadorea: Spirurida: Physalopteridae) Parasites in Reptiles: An Integrative Approach on the Enigmatic P. retusa Suggests Cryptic Speciation

(1) Background: Although Physaloptera retusa is one of the most widespread species infecting reptiles in the Americas, numerous taxonomic problems and little genetic data are associated with it. To clarify the taxonomy of this species, we used an integrative approach. (2) Methods: Physaloptera retusa-infecting Erythrolamprus typhlus (snake) from the Pantanal wetlands, Brazil, was morphologically and genetically characterised (18S and 28S rDNA; COI mtDNA) and compared with conspecific sequences available in GenBank, from parasites of Tupinambis teguixin (lizard), using species delimitation methods. Type specimens of P. liophis were re-evaluated given its morphological similarities with P. retusa. (3) Results: The morphology of the present specimens was equal to that of P. retusa, in which the only difference from P. liophis was the relative position of the vulva. Species delimitation methods were more accurate for the COI dataset; all of them (except ABGD) indicated interspecificity among P. retusa sequences. However, a lack of morphological data or voucher material, associated with the deposited sequences, prevented more assertive conclusions. (4) Conclusions: The present results highlight the importance of a clear association between genetic data and morphology of the isolation source, or at least its adequate vouchering. Moreover, P. retusa may represent a species complex in cryptic speciation, since it is widespread and has low hosts specificity.