Energy Balance and Mixing Timescales in a Stirring Tropical Estuary, Itamaracá, Brazil

Leite, Fabiana S.; Araujo, Moacyr; Medeiros, Carmen; Endres, Jean-Philippe

doi:10.2112/04-0399.1

Cited by 2 publications

(4 citation statements)

References 15 publications

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“…input) (Smith and Epstein, 1971;Fry, 2006). Conversely, Santa Cruz and Catuama exhibit a well-mixed environment (Leite et al, 2008), and despite a clear seasonal trend reported for theses estuaries (Medeiros and Kjerfve, 1993;Medeiros et al, 2001), we were not able to identify any seasonal variations. Other studies have similarly observed minimal or absent seasonal variations in estuarine food webs (Akin and Winemiller, 2006;Baeta et al, 2009).…”

Section: Discussioncontrasting

confidence: 78%

Trophic resource partitioning of two snook fish species (Centropomidae) in tropical estuaries in Brazil as evidenced by stable isotope analysis

Gonzalez

Ménard

Loc’h

et al. 2019

Estuarine, Coastal and Shelf Science

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We investigated the trophic niches and the resource partitioning of two snook species, the common (Centropomus undecimalis) and the fat snook (C. parallelus), in four tropical estuaries of the northeastern Brazil, using stable isotope analyses of carbon (δ13C) and nitrogen (δ15N). Fish specimens, mainly juveniles, basal resources and a primary consumer were collected in 2015 during dry and rainy seasons in all estuaries, which exhibited differences in system size, geomorphologic shapes, levels of sea access and anthropic pressures. Potential effect of factors like fish body length, estuary and seasonality on isotope ratios were investigated. Positive relationships between the size of fish and δ15N values were found, regardless the species. Our results indicated that snooks can be characterized as secondary consumers and have close trophic niches in most estuaries. Trophic overlaps were more pronounced within the largest estuaries (Catuama and Santa Cruz), whereas smaller systems that have restricted connections to the sea presented low isotopic niche overlap between both species (Suape and Sirinhaém). Moreover, a higher variability of δ13C and δ15N values in snooks was found in larger estuaries undergoing stronger influences from coastal adjacent waters. Although we were not able to detect clear seasonal effects, greater isotopic overlaps were found during the rainy season. Despite the lack of intrinsic differences in life history traits, both species, dominated by juveniles, shared similar trophic niches in these environments. Highlights ► δ 13 C and δ 15 N of two Centropomidae were investigated in four estuaries in Brazil. ► Juveniles of Centropomus undecimalis and C. parallelus have close isotopic niches. ► Trophic overlaps were more pronounced in large estuaries. ► Resource partitioning process might reflects the resource availability in estuaries.

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Section: Discussioncontrasting

confidence: 78%

Trophic resource partitioning of two snook fish species (Centropomidae) in tropical estuaries in Brazil as evidenced by stable isotope analysis

Gonzalez

Ménard

Loc’h

et al. 2019

Estuarine, Coastal and Shelf Science

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show abstract

“…Previous field measurements and numerical studies indicate that flow structures in the SSC are largely dominated by bottom shear, when compared to the effects of surface wind stress over vertical distribution of momentum (Medeiros and Kjerfve 1993;Araujo et al, 2000a;Leite et al, 2008) mainly during the dry season. As so, boundary conditions at the bottom introduce loglaw behavior for tangential velocities, which are expressed here through a linear behavior.…”

Section: An Analytical Model For Tidal Currentsmentioning

confidence: 99%

“…The major justification for above equation is that it yields classical logarithmic velocity profiles, providing accurate description for bottom boundary layers in similar studies (Araujo et al, 2000a,b;Leite et al, 2008;Wang and Craig, 1993). Denoting ' u the total velocity in the bottom boundary layer, where ( H z ) is small, the solution for ' u derived from Eqs.…”

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confidence: 93%