Flood pulse induced changes in isotopic niche and resource utilization of consumers in a Mexican floodplain system

Sepúlveda-Lozada, Alejandra; Saint-Paul, Ulrich; Mendoza‐Carranza, Manuel; Wolff, Matthias; Yáñez‐Arancibia, Alejandro

doi:10.1007/s00027-017-0520-9

Cited by 27 publications

(11 citation statements)

References 52 publications

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“…The trophic structure of the macroinvertebrate and fish assemblages was described for each site for the dry and wet seasons separately using Layman's Bayesian stable isotope‐based community‐wide metrics (Layman et al., ; R Development Core Team, ). Because not all species occurred at all sites, macroinvertebrate FFGs and fish trophic guilds were used to run the analyses (de Castro et al., ; Sepúlveda‐Lozada, Saint‐Paul, Mendoza‐Carranza, Wolff, & Yáñez‐Arancibia, ). The five Layman's community metrics considered were as follows: (a) δ 13 C range (CR), which depicts basal source diversity; (b) δ 15 N range (NR), which describes trophic length; (c) the mean distance to centroid (CD), which is the mean Euclidean distance of each assemblage component to the centroid and a measure of community niche width (related to trophic diversity) and species spacing; (d) the mean nearest neighbour distance (MNND), which is the mean Euclidean distance from each group to its nearest neighbour in the δ 13 C‐δ 15 N biplot space, an estimate of density and clustering of species within the community; and (e) the standard deviation of the nearest neighbour distance (SDNND), which measures the uniformity (evenness) of the groups’ spacing in the biplot space (Jackson et al., , ; Layman et al., ).…”

Section: Methodsmentioning

confidence: 99%

Trophic structure of an African savanna river and organic matter inputs by large terrestrial herbivores: A stable isotope approach

et al. 2018

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Knowledge of trophic structure is important to understand sources and pathways of energy resources in community ecology and to identify determinants of ecosystem changes. Yet, little is known from rivers of African savanna receiving large inputs of terrestrial organic matter and nutrients by large mammalian herbivores. We used Stable Isotope (δ13C and δ15N) Bayesian Ellipses in R (SIBER) and Layman's community‐wide metrics to describe seasonal variation in trophic niches and trophic structures in midorder river reaches in the Mara River (Kenya) that differed in environmental conditions (agricultural vs. forested) and amounts of organic matter and nutrients (low vs. high inputs by livestock and hippopotami, Hippopotamus amphibius). These analyses were supplemented with data on the trophic diversity of macroinvertebrate functional feeding groups (FFGs) and fish trophic guilds. The δ13C and δ15N of basal resources and consumers differed between sites and changed with seasons. Sites in agricultural areas that were utilised by livestock and a site with hippopotami had higher δ13C than the forested site due to the presence of C4 carbon from egestion and excretion by the grazers. The forested site recorded the most taxon‐rich and trophic‐diverse invertebrate community, suggesting both autochthonous and allochthonous sources of energy were available. Agricultural sites and the site with hippopotami recorded high abundances of collector taxa in response to large inputs of organic matter. Fish trophic guilds were less diverse and were dominated by insectivores. The food web at the forested site had the widest trophic niche size and highest isotopic trophic diversity compared to sites in areas with large mammalian herbivores. Invertebrate and fish trophic niche sizes changed according to food resources varying with space and time. Invertebrates had higher δ13C values during the dry season. In contrast, fish showed higher δ13C values during the wet season, and trophic niche sizes were constricted and considerably overlapping, suggesting feeding on a narrow range of food sources with high trophic redundancy. This study showed that increased terrestrial organic matter by large mammalian herbivores affected trophic diversity and niche sizes for aquatic consumers in rivers draining the African savanna. Linking the density of terrestrial large mammalian herbivores to aquatic ecosystem structure and function could help manage their populations sustainably.

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Section: Methodsmentioning

confidence: 99%

Trophic structure of an African savanna river and organic matter inputs by large terrestrial herbivores: A stable isotope approach

et al. 2018

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“…The strong influence of river inputs on the trophic status and hydrological diversity evidenced in the present work was consistent with the Flood Pulse Concept (FPC) which defines flood pulse as the major driving force in wetland systems (Junk and Wantzen 2004). This concept was recently linked in Terminos Lagoon to an adaptive diversification in resource use by consumers (Sepúlveda-Lozada et al 2017), with periods of high river inputs resulting in higher trophic diversification and lower trophic redundancy, and conversely. Shifts in hydrological diversity and trophic status leading to a strong variability in food supply have been seen to impact entire communities in terms of density, diversity, and physiological state (Wantzen et al 2002;Junk and Wantzen 2004;Abrantes et al 2014).…”

Section: Short-to Long-term Potential Consequencesmentioning

confidence: 99%

Spatiotemporal variability in Terminos Lagoon (Mexico) waters during the 2009–2010 drought reveals upcoming trophic status shift in response to climate change

et al. 2019

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The 2009-2010 El Niño was accompanied by a severe drought strongly impacting Mexico as well as Central America, the Caribbean, and the southern USA. The present work aims at assessing how such a major climatic event impacted the hydrological typology of transitional waters in Terminos Lagoon, one of the largest shallow tropical lagoons fringing the Gulf of Mexico. Spatiotemporal inter-comparison of hydrological conditions was conducted by pairing a reference multiparametric dataset (14 hydrological parameters versus 34 sampling stations) averaged over the October 2008 to July 2010 period with each sampling occurrence dataset and running Principal Component Analyses (PCA), setting the reference-survey dataset as active variables and each sampling occurrence dataset as non-active (supplementary) variables. It revealed that the exceptional deficit in freshwater supply to the lagoon during the 2009-2010 El Niño drastically reduced hydrological diversity and lowered the trophic status of the lagoon. Short-term shifts in environmental status are common in transitional waters and responsible for temporary shifts in community structure but climate change projections show a significant long-term decrease in the freshwater discharge at the regional scale that will impact Terminos Lagoon as well as other coastal lagoons of Mexico and Central America. When combined with sea level rise, such a decrease will result in a long-term shift in hydrological conditions with a subsequent increase in salinity and a decrease in the diversity of environmental conditions affecting trophic status, will have a long-term impact on the biota.

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“…The majority are marine species that enter the lagoon cyclically or sporadically, in addition to estuarine and freshwater species that can live in euryhaline conditions (Yáñez-Arancibia et al 1993). Recent studies indicate that fish diversity in mangrove habitats is composed of 18 (Amador-del Ángel et al 2015) up to 34 species, in the area of mangrove and seagrass (Sepúlveda-Lozada et al 2017). However, this ecosystem is under threat due to anthropogenic activities and natural phenomena (Soto-Galera et al 2010, Zaldívar-Jiménez et al 2017.…”

Section: Introductionmentioning

confidence: 99%

The fish community in Gulf of Mexico mangroves, a response to hydrological restoration

Soria‐Barreto

Fernández

Ramos

et al. 2021

Lat. Am. J. Aquat. Res.

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The present study evaluated the ecological response of fish fauna to hydrological restoration in a mangrove area in Terminos Lagoon in the Gulf of Mexico. In two years, environmental parameters and ichthyofauna were obtained in a channel under restoration and a conserved channel. The fish fauna was composed of 12 species. As a result of the restoration process, changes in composition and abundance of some species were detected. The presence of visiting marine species Bathygobius soporator and Eucinostomus melanopterus, and an increase in the abundance of resident fish, livebearers species, were recorded. Richness, diversity, and evenness vary significantly between channels. Generalized linear mixed models indicated that the abundances of resident and overall fishes were significantly related to water depth, temperature, and salinity. The results suggest that fish are an ecological indicator of the mangrove reconnection with the Terminos Lagoon and the restoration of natural tidal flow in the short term. Long-term systematic monitoring of fish fauna will promote a better understanding of the restoration of mangroves and corresponding changes in the function of this ecosystem.

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Flood pulse induced changes in isotopic niche and resource utilization of consumers in a Mexican floodplain system

Cited by 27 publications

References 52 publications

Trophic structure of an African savanna river and organic matter inputs by large terrestrial herbivores: A stable isotope approach

Trophic structure of an African savanna river and organic matter inputs by large terrestrial herbivores: A stable isotope approach

Spatiotemporal variability in Terminos Lagoon (Mexico) waters during the 2009–2010 drought reveals upcoming trophic status shift in response to climate change

The fish community in Gulf of Mexico mangroves, a response to hydrological restoration

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