Effects of deforestation and other environmental variables on floodplain fish catch in the Amazon

Barros, Daniela de França; Petrere, Miguel; Lecours, Vincent; Butturi-Gomes, Davi; Castello, Leandro; Isaac, Victória J.

doi:10.1016/j.fishres.2020.105643

Cited by 19 publications

(13 citation statements)

References 42 publications

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“…Consequently, it seems likely to be very sensitive to the degradation and deforestation of marginal forested lands. A recent study has shown the importance of conserving forests to maintain high fish catches and fisheries productivity in the Amazon (Barros et al, 2020). In this way, the conservation of riparian and floodplain forests should be considered essential for the maintenance of viable populations of pacu and probably other frugivorous fishes in the Pantanal.…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal diet shifting in a neotropical fish species: The role of riparian vegetation and seasonal inundation

Mateus

Costa²,

Penha³

2022

Front. Environ. Sci.

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Aquatic organisms that consume resources from riparian vegetation or floodplain forests act as trophic links between aquatic and terrestrial ecosystems. For instance, the pacu Piaractus mesopotamicus (Holmberg 1887), which is a migratory fish species, can play an important role in this interaction on Neotropical floodplains. We compared the stomach content of individuals from this species between two different parts of a large river floodplain during contrasting hydrological seasons to quantify the spatiotemporal contribution of allochthonous and autochthonous resources in their diet. Moreover, we performed a bipartite network approach to evaluate the sensitivity of these populations to a simulated loss of food resources through the potential deforestation of riparian vegetation. We found that in the upper catchment, individuals fed mainly on allochthonous items, but their identity depended on the season: fruits were the most abundant resource during the wet season, whereas leaves were more consumed during the dry season. In the lower catchment, the contribution of allochthonous resources was slightly lower in the dry season than in the wet season, when the pacu was able to explore the floodplain. Finally, the results from our consumer-resource network model indicated that this system is vulnerable to riparian deforestation since P. mesopotamicus is highly dependent on input from the riparian vegetation items to its feed.

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Section: Discussionmentioning

confidence: 99%

Spatiotemporal diet shifting in a neotropical fish species: The role of riparian vegetation and seasonal inundation

Mateus

Costa²,

Penha³

2022

Front. Environ. Sci.

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“…However, other factors may contribute to the reduction of fishery production in the Madeira River. As is the case with deforestation, which decreases the ciliary forests and thus the amount of allochthonous food available to fish communities (Claro-Jr et al, 2004;Castello and Macedo, 2016;Renó et al, 2016;Barros et al, 2020), while at the same time results in competition between species and the reduction of populations of less adapted fish (Ruffino, 2016). In addition, the absence of robust fishery legislation and continuous information on fishery statistics has hindered the proper management of fishing stocks on the border between Brazil and Bolivia (Maldonado et al, 2017;Aguilera, 2018).…”

Section: Discussionmentioning

confidence: 99%

Hydroelectric Dams From Madeira River Seasonally Impacts the Fisheries Production in the Guaporé Basin (Rondônia, Brazil)

Freitas¹,

Doria²,

Sousa³

2021

Bol. Inst. Pesca

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In the Amazon region, fisheries play an important role in the socioeconomic and cultural context and are directly affected by changes in the hydrological cycle, which can interfere with the numbers and frequency of fish species landed. This study analyzed the variation of fishery production against the seasonality of the water level of the Guaporé River (a tributary of the Madeira River) using information contained in the records of fishery landings in the area under study. In addition, two periods pre (2000 to 2008) and post (2009 to 2019) installation of the Jirau and Santo Antônio dams in the Madeira River were considered. Fish production in the period prior to damming indicated linearity (r2 = 0.41) which was inversely proportional to the water levels of the Guaporé River, with low fish production in the flood and high production during the low water phases. However, for the period after damming, these variables showed low correlation (r2 = 0.14). Among the fish species exploited, 35.13% presented significant differences (p <0.05) between the production values for the periods before and after installation of the dams. Therefore, the results showed significant differences between the values of fishery production by species and phases of the hydrological cycle of the Guaporé River, which occurred in the periods pre and post damming of the Madeira River, which indicates that the hydroelectric dams have negatively impacted the fish stocks of this region. The information contained in this study is useful and serves as a basis for coherent decision-making, since it aids in the sustainable management and monitoring of fish stocks in the Madeira River Basin.

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“…S16 ). Nonmain channel open water is found off the main channel of river, i.e., lakes, abandoned side-channels, streams, and other forms of standing water on the floodplain, which is critical habitat for freshwater fish in the region ( 48 , 70 , 71 ).…”

Section: Methodsmentioning

confidence: 99%

Landscape-scale concordance between local ecological knowledge for tropical wild species and remote sensing of land cover

Takasaki

Coomes

Abizaid

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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Monitoring the status of species is crucial for biodiversity conservation and sustainable resource management in tropical forests, but conventional in situ monitoring methods are impractical over large scales. Scientists have resorted to two potentially complementary approaches: local ecological knowledge (LEK) and remote sensing. To gauge the potential of combining LEK and remote sensing for assessing species status at landscape scales, a large-scale assessment of the reliability of both measures is critical but hampered by the lack of ground-level data. We conducted a landscape-scale assessment of LEK and remote sensing, using a survey of over 900 communities (a near census in our study area) and nearly 4,000 households in 235 randomly selected communities in the Peruvian Amazon—the largest LEK survey as yet undertaken in tropical forests. The survey collected LEK data on the presence of 20 indicator species from both community leaders/elders and randomly sampled households. We assessed LEK and remotely sensed land cover—forest cover and nonmain channel open water—as proxies for species habitat, across species (game, fish, and timber), over time (current and historical), and by indigeneity (Indigenous peoples and mestizos). Overall, LEK and remotely sensed land cover corroborate each other well. Concordance is highest for the current status of game species reported by sampled households, as is the concordance of historical LEK from Indigenous community leaders/elders. The results point to the promise of combining LEK and remote sensing in monitoring the status of species in data-poor tropical forests.

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Effects of deforestation and other environmental variables on floodplain fish catch in the Amazon

Cited by 19 publications

References 42 publications

Spatiotemporal diet shifting in a neotropical fish species: The role of riparian vegetation and seasonal inundation

Spatiotemporal diet shifting in a neotropical fish species: The role of riparian vegetation and seasonal inundation

Hydroelectric Dams From Madeira River Seasonally Impacts the Fisheries Production in the Guaporé Basin (Rondônia, Brazil)

Landscape-scale concordance between local ecological knowledge for tropical wild species and remote sensing of land cover

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