Freshwater Inflow Variability Affects the Relative Importance of Allochthonous Sources for Estuarine Fishes

Possamai, Bianca; Hoeinghaus, David J.; Odebrecht, Clarisse; Abreu, Paulo César; Moraes, Leonardo Evangelista; Santos, Alexandre Clistenes Alcântara; Garcia, Alexandre

doi:10.1007/s12237-019-00693-0

Cited by 18 publications

(5 citation statements)

References 67 publications

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“…It is well known that freshwater inflow is one of the main drivers to the estuarine diversity, in this region the high water consumption by damming, associated with a low freshwater input in the rainy season, might have an influence over nutrient cycling, fish guilds, and in the salinity itself into the estuary (Garcia et al 2004, Possamai et al 2018, Possamai et al 2020, this favors marine species predominance as shown here. Moreover, the damming along the Paraiba river basin, generated by needs towards water consumption, by human, on agriculture, and on livestock (Teixeira et al 2020) affect the maintenance of annual hydrological regime as a whole, which is characterized by rainy and dry seasons typical of the semiarid Paraiba state region.…”

Section: Discussionsupporting

confidence: 53%

Espécies de peixes do estuário do Rio Paraíba, nordeste do Brasil

Vendel¹,

Macêdo²,

Silva³

et al. 2022

Biota Neotrop.

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The Paraiba River estuary is the largest and most important estuary of Paraiba state, northeastern Brazil. It is under intense environmental degradation by the surrounding human population, and possibly several fish species are at risk in this habitat. Scientific sampling of the ichthyofauna started in the late 1970's and proceeded until recently. We present a list of fish species captured in this estuary, based on voucher specimens housed at the Federal University of Paraiba collection. Four orders of Chondrichthyes and 26 orders of Osteichthyes were identified. A total of 187 fish species, including eight species of Chondrichthyes and 179 Osteichthyes, with 123 genera and 57 families were identified. Perciformes dominated in terms of richness (32 species), followed by Acanthuriformes and Clupeiformes. Comparing estuaries along the Brazilian northeastern coast and considering our large time sampling span, a higher richness would be expected. According to the IUCN Red List, Urotrygon microphthalmum is considered Critically Endangered and more seven species are classified as Vulnerable: Rhizoprionodon porosus, Rhinoptera bonasus, Megalops atlanticus, Epinephelus itajara, Hyporthodus niveatus, Lutjanus cyanopterus, and Cynoscion acoupa. Three of these species also appear in the same category in the threatened Brazilian list, all of which have declining population trends. Concerning the Elasmobranchii, Carcharhinus porosus is listed as Critically Endangered in our country and globally. This inventory organizes and broadens knowledge on the fish community that occurs in this important ecosystem, with inferences about life habits, ecological guilds and conservation status of the fish species.

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Section: Discussionsupporting

confidence: 53%

Espécies de peixes do estuário do Rio Paraíba, nordeste do Brasil

Vendel¹,

Macêdo²,

Silva³

et al. 2022

Biota Neotrop.

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“…Elevated outflow only modified local hydrodynamics briefly (approximately 1 month; Figure 2), and the influence of this perturbation on local food webs may have been brief and not captured by our sampling strategy, particularly given the punctuated nature of runoff impacts and delays in tissue turnover for many organisms (Vander Zanden et al, 2015). Hydrology is a common driver of food web structure in many habitats, including estuaries (Possamai et al, 2020), and so the potential for hydrologic disruption of hydrodynamic‐driven food web structure should not be discounted.…”

Section: Discussionmentioning

confidence: 99%

Hydrodynamics drive pelagic communities and food web structure in a tidal environment

et al. 2020

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Hydrodynamic processes can lead to the accumulation and/or dispersal of water column constituents, including sediment, phytoplankton, and particulate detritus. Using a combination of field observations and stable isotope tracing tools, we identified how hydrodynamic processes influenced physical habitat, pelagic communities, and food web structure in a freshwater tidal system. The pelagic habitat of a terminal channel differed spatially, likely aligning with differences in hydrodynamics. Three zones that we classified by exchange with downstream habitat had distinct water quality characteristics, supported different densities of zooplankton and nekton, and exhibited disparate support from benthic and pelagic trophic pathways to pelagic consumers. Hydrodynamically driven zones and their emergent characteristics appeared sensitive to hydrology, as elevated runoff was correlated with a shift in hydrodynamic habitat and organismal distributions. The results of our study highlight the relationship between hydrodynamic processes, biological responses, and climate, and suggest that understanding the physical process can improve understanding of pelagic habitats and communities.

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“…Contributions were estimated for small and large individuals from two sites in Lake Champlain (Main Lake and Northeast Arm). Possamai et al, 2020). We used stable isotopes to predict the potential effects of an imminent biological invasion on the aquatic food chain and species interaction.…”

Section: Discussionmentioning

confidence: 99%

Contrasting energy pathways suggest differing susceptibility of pelagic fishes to an invasive ecosystem engineer in a large lake system

et al. 2023

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Species invasions can lead to ecological regime shifts by altering food web structure and changing nutrient cycling. Stable isotopes are a powerful tool to understand the potential and realized impacts of invasive species on food webs, especially when used in tandem with other dietary tracers. An invasion by one of the most notorious freshwater invaders in North America, the quagga mussel (Dreissena bugensis), is imminent in Lake Champlain, United States. An invasion by this filter feeder has the potential to drastically alter energy pathways and destabilize pelagic fisheries via bottom-up impacts. However, the extent and magnitude of these impacts depend on the current food web structure of the mid-trophic pelagic food web, which was previously not well described. We used Bayesian stable isotope mixing models informed by stomach content analysis to identify which energy pathways are currently most important to mid-trophic level fishes. We determined that in the Main Lake basin, the spring phytoplankton bloom and deep chlorophyll layer – the resources most vulnerable to quagga mussels – provide a disproportionate amount of support to the pelagic food web via zooplankton and the migrating macroinvertebrate Mysis. The food web in the Northeast Arm of Lake Champlain is supported by epilimnetic phytoplankton, which is more protected from the filtration effects of quagga mussels than the deep chlorophyll layer. However, the Northeast Arm will likely not provide a high-quality foraging refuge to coldwater pelagic fish due to unfavorable oxythermal conditions. The mid-trophic food web of Lake Champlain—and consequently piscivores who rely on these prey—may be vulnerable to the impending quagga mussel invasion if migratory Mysis are not able to shift their diet to benthic resources.

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Freshwater Inflow Variability Affects the Relative Importance of Allochthonous Sources for Estuarine Fishes

Cited by 18 publications

References 67 publications

Espécies de peixes do estuário do Rio Paraíba, nordeste do Brasil

Espécies de peixes do estuário do Rio Paraíba, nordeste do Brasil

Hydrodynamics drive pelagic communities and food web structure in a tidal environment

Contrasting energy pathways suggest differing susceptibility of pelagic fishes to an invasive ecosystem engineer in a large lake system

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