Structure of the ichthyoplankton community in a Neotropical floodplain lake affected by environmental degradation

Oliveira, Lucas Silva de; Cajado, Ruineris Almada; Santos, Luan Robson Bentes dos; Zacardi, Diego Maia

doi:10.1590/0001-3765202220201598

Cited by 5 publications

(4 citation statements)

References 44 publications

(34 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, protected areas on both riverbanks maximize productivity and fish conservation (Keppeler et al, 2017;Silvano, 2020;Rocha et al, 2022). These conditions can increase the survival of larvae since it facilitates their access to the river's marginal lagoons, which are considered nursery and fish recruitment sites in the Tapajós River (Oliveira et al, 2022;Vieira et al, 2023).…”

Section: Figurementioning

confidence: 99%

“…Moreover, ichthyoplanktonic studies can help detect the influence of climatic events and environmental impacts at local and regional levels on the structure and early life history of species (Bonecker et al, 2019;Cajado et al, 2022;Oliveira et al, 2022). Because many Amazonian rivers have become vulnerable to anthropic pressures, the impacts of these actions have been directly observed on fish communities, which show a decrease in their species richness, functional diversity and increased ingestion of plastic waste (Arantes et al, 2018;Andrade et al, 2019;Ribeiro-Brasil et al, 2020;Keppeler et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ichthyoplankton and plastic waste drift in a river in the Amazon Basin, Brazil

Oliveira

Oliveira-Junior²,

Cajado³

et al. 2023

Front. Environ. Sci.

Self Cite

View full text Add to dashboard Cite

Egg and larvae drift is a key mechanism for early fish stages to colonize nursery and growth areas and provides insights into ichthyofauna spawning times and spawning locations—crucial information for understanding fish biology. In the Tapajós River, Amazon Basin, no study has investigated the drift of ichthyoplankton along the hydrological phases nor the occurrence and dispersion of plastic waste associated with plankton. Thus, we aimed to present an overview of the spatio-temporal drift of ichthyoplankton and plastic waste in this river. Temporal sampling was carried out along a spatial gradient of approximately 300 km, covering different sectors of the river. Ichthyoplankton and plastic waste were captured through horizontal trawls on the subsurface of the water column for 10 min. Fish larvae belonging to 10 taxonomic orders and with an average size of 4.98 mm ± 3.14 mm were captured. Clupeiformes larvae occurred in all hydrological phases and reproductive peaks for other orders were recorded. Plastic waste was classified into 20 types according to color and shape and an average size of 1.55 mm ± 1.27 mm. Green fragments and blue filaments were the most abundant. We found the highest density of fish eggs and larvae drifting during the drought phase in stretches with greater environmental structure, whereas plastics were more abundant during the receding water phase in more turbulent stretches that have impacts from illegal mining. Simultaneous drift of ichthyoplankton and plastic waste was recorded in all hydrological phases and sampled sectors. This is worrying because, although we did not analyze the ingestion of plastics by fish larvae, plastic waste can enter the nursery areas of the Tapajós River and reduce the function of these areas for fish. Here we discover through the high densities of fish eggs and larvae deriving that the Tapajós River is an important reproduction site for ichthyofauna and that the presence of different landscape configurations prove to be a key factor in the dispersion, retention and development of ichthyoplankton and plastic waste.

show abstract

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ichthyoplankton and plastic waste drift in a river in the Amazon Basin, Brazil

Oliveira

Oliveira-Junior²,

Cajado³

et al. 2023

Front. Environ. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The reproduction of fish species is directly related to the integrity of the habitat and the modifications caused naturally in the environment (Oliveira et al, 2022; Winemiller, 1989). However, anthropogenic actions at both local and regional scales have been determinants in putting at risk and threatening the maintenance of fish species (Andrade et al, 2019; Duponchelle et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Population structure and reproductive indicators of the surubim Pseudoplatystoma punctifer (Siluriformes, Pimelodidae) in the São Miguel River, Amazon basin, Brazil

de Oliveira Dias,

Zanchi,

Zacardi

et al. 2024

Journal of Fish Biology

Self Cite

View full text Add to dashboard Cite

Fish is an important source of food and income for a significant portion of the Amazonian population, especially those who live along the rivers and lakes in the region. Pseudoplatystoma punctifer (Castelnau, 1855), known as surubim, is a species of Neotropical catfish widely exploited by fisheries and commercially valuable in the Guaporé River basin, Brazil. However, population dynamics are poorly known in the region. To understand the population structure and reproductive biology aspects of the surubim, monthly experimental fisheries were carried out in the São Miguel River, state of Rondônia, Brazil, between August 2020 and July 2021. The captured fish were weighed, and its gonads were removed and weighed for histological analyses (microscopic description) and classification of the maturation stages (macroscopic description). The collected gonads were fixed in 10% buffered formalin, dehydrated, cut into 4‐μm‐thick sections, and stained with hematoxylin and eosin. A total of 34 individuals were collected (20 females and 14 males), showing positive allometric growth and condition factor from 0.81 to 1.79 for females and males, respectively. Females were larger in size and weight than males. P. punctifer reaches its first maturation at an average length of 68.30 cm, indicating the importance of respecting the minimum capture size as an alternative to ensure the natural stocks of this fishery resource in the region. The results provide support for the establishment of public policies and actions for conservation, management, and regulation of fishing.

show abstract

“…Successful biological recruitment of fish is essential to maintaining natural stocks of a large portion of species that are important for subsistence, commercial and recreational fisheries in the Amazon (Mariac et al, 2021; Oliveira et al, 2022; Zacardi, Dos Santos, et al, 2020). In this study, we evaluated potential associations between taxonomic and functional composition of ichthyoplankton with seasonal hydrology in the floodplain of the lower Amazon River.…”

Section: Introductionmentioning

confidence: 99%

Seasonal patterns in the structure of the fish larvae assemblages in the lower Amazon River

et al. 2023

View full text Add to dashboard Cite

This study assessed the phenology and functional structure of parental stocks of fish larvae, and evaluated how the species modulate their reproductive activities as a function of natural hydrological regimes in the lower Amazon River, Brazil. Larvae were collected using conical plankton nets monthly over two hydrological cycles between January and December 2013, and between May 2017 and April 2018. The collections were conducted around an alluvial island located near the municipality of Santarém, Pará, Brazil. After identification, individuals were classified into four functional groups (e.g., life‐history strategy, feeding habits, type of migration, and swimming‐performance/microhabitat‐use in the water column) based on species traits. The relationships between seasonal hydrology, environmental variables and larval assemblage structure were evaluated using multivariate analyses. A total of 31,347 fish larvae were collected, from nine taxonomic orders, 26 families, 40 genera and 53 species. The larval assemblages showed highly variable taxonomic and functional composition between different phases of the hydrological cycle (rising water, high water, receding water and low water) and were strongly influenced by environmental variables. Fish reproductive phenology in the lower Amazon is complex and distributed among the hydrological phases. The different ecological characteristics allow the species to withstand specific environmental conditions during each phase. Changes in the structure of larval assemblages indicate that hydrological variability is a key ecological factor influencing the reproductive dynamics of fish and reflects adaptive strategies used to reduce interspecific competition for space and food, maximising recruitment. The variation of fish reproduction across the hydrological cycle that we observed is a result of different ecological characteristics enabling species and functional groups to adapt to environmental conditions of each phase.

show abstract

Structure of the ichthyoplankton community in a Neotropical floodplain lake affected by environmental degradation

Cited by 5 publications

References 44 publications

Ichthyoplankton and plastic waste drift in a river in the Amazon Basin, Brazil

Ichthyoplankton and plastic waste drift in a river in the Amazon Basin, Brazil

Population structure and reproductive indicators of the surubim Pseudoplatystoma punctifer (Siluriformes, Pimelodidae) in the São Miguel River, Amazon basin, Brazil

Seasonal patterns in the structure of the fish larvae assemblages in the lower Amazon River

Contact Info

Product

Resources

About