Prolonged drought influences the taxonomic and functional structure of fish assemblages in estuaries along the Brazilian semiarid coast

Gurgel-Lourenço, Ronaldo César; Rodrigues-Filho, Carlos A. S.; Pinto, Leonardo M.; Sánchez-Botero, Jorge Iván

doi:10.1007/s10750-022-05059-5

Cited by 4 publications

(1 citation statement)

References 96 publications

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“…BSC constitutes a distinctive coastal band directly influenced by the dry semiarid climate in low latitude and altitude, where annual precipitation can be less than 800 mm (Alvares et al, 2014). The short-term rainfall season promotes hypersaline conditions in BSC estuaries (Valentim et al, 2018;Soares et al, 2021;Gurgel-Lourenço et al, 2023a).…”

Section: Introductionmentioning

confidence: 99%

First records of Microdesmus longipinnis (Weymouth, 1910) (Actinopteri, Gobiiformes, Microdesmidae) for the Brazilian semiarid coast

Gurgel-Lourenço,

Pinto,

Bezerra

et al. 2024

Pap. Avulsos Zool.

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Microdesmus longipinnis was documented for the first time in the Brazilian semiarid coast. Previous occurrences of this species ranged from the Western Atlantic, North Carolina (USA) to the southeastern coast of Brazil, and there is still a substantial gap between these regions. Specimens were collected in the Curu and Pacoti estuaries, Ceará state, Brazil. These new records of M. longipinnis can help to fill a portion of the geographical distribution gap for species inhabiting estuaries under the semiarid climate of Brazil.

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Section: Introductionmentioning

confidence: 99%

First records of Microdesmus longipinnis (Weymouth, 1910) (Actinopteri, Gobiiformes, Microdesmidae) for the Brazilian semiarid coast

Gurgel-Lourenço,

Pinto,

Bezerra

et al. 2024

Pap. Avulsos Zool.

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Ecosystem Size Drives Patterns and Control Mechanisms of Mixotrophs Success Across Tropical Lakes: A Large-Scale Assessment of the Grand Écart Hypothesis

Costa,

Quesado,

Nobre

et al. 2024

Ecosystems

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Mixotrophy, a physiological trait combining autotrophy and heterotrophy in one organism, significantly contributes to energy and matter transfer in aquatic ecosystems. However, understanding how environmental factors influence mixoplankton success across freshwater ecosystems has been uncertain. The grand écart hypothesis (GEH) posits that light and nutrient availability are key components of mixotrophs' niche, suggesting that ecosystem properties determine opposing gradients of light and nutrients, creating environmental filtering for mixotrophs. We hypothesized that ecosystem size, a property of lake ecosystems, mediates the prevalence of patterns and control mechanisms predicted by the GEH on mixoplankton relative biomass (MRB). Using data from 98 tropical lakes, we demonstrated that lake size mediates the inverse relationship between light and nutrient availability across ecosystems. Larger lakes have more light but low nutrients, while smaller lakes have more nutrients but greater shading. Light availability better explains MRB in small lakes, and nutrients better explain MRB in large lakes, with MRB values being higher in small lakes, with secondary influence from zooplankton herbivory. Our results validate the GEH as a significant framework for explaining patterns and control mechanisms of mixoplankton across tropical lakes. This study highlights the significance of lake size as an ecosystem property that generates opposing light and nutrient gradients, further emphasizing its importance for understanding mechanisms regulating freshwater phytoplankton community structure and functioning. Integrating lake size within the conceptual framework of the GEH could aid in explaining mixoplankton success over macroecological scales.

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Pimelodus maculatus abundance in the tailrace of the Machadinho hydroelectric power plant during drought conditions

Bernardes Junior,

Pedron,

Guereschi

et al. 2024

Journal of Fish Biology

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Fish presence in tailraces is a remarkable management concern in operating hydroelectric power plants (HPP) in Brazilian rivers. Fish get blocked during upstream migration for spawning, and large shoals can last for days in the tailrace; however, the circumstances that attract fish throughout the year to this region are uncertain, especially during drought conditions. To unravel this uncertainty, we modeled the relationship between Pimelodus maculatus abundance and environmental and operational variables (N = 26) in monthly fishing campaigns at the Machadinho HPP (N = 18). A generalized additive model was fitted to fish abundance in which water conductivity, 30‐day accumulated precipitation, reservoir inflow, and seasonality explained 93% of the deviance. It was found that abundance decreased as water conductivity increased, but abundance was higher in summer. However, winter showed the highest abundance in the entire rainfall range with peaks between 130 and 150 mm and above 250 mm. An increase in reservoir inflow decreased fish abundance. During droughts, our findings suggest that the powerhouse foundations, particularly the draft tube, may serve as refugia to P. maculatus.

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Prolonged drought influences the taxonomic and functional structure of fish assemblages in estuaries along the Brazilian semiarid coast

Cited by 4 publications

References 96 publications

First records of Microdesmus longipinnis (Weymouth, 1910) (Actinopteri, Gobiiformes, Microdesmidae) for the Brazilian semiarid coast

First records of Microdesmus longipinnis (Weymouth, 1910) (Actinopteri, Gobiiformes, Microdesmidae) for the Brazilian semiarid coast

Ecosystem Size Drives Patterns and Control Mechanisms of Mixotrophs Success Across Tropical Lakes: A Large-Scale Assessment of the Grand Écart Hypothesis

Pimelodus maculatus abundance in the tailrace of the Machadinho hydroelectric power plant during drought conditions

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