Importance of estuary morphology for ecological connectivity with their adjacent coast: A case study in Brazilian tropical estuaries

Pelage, Latifa; Gonzalez, Júlio Guazzelli; Loc’h, François Le; Ferreira, Valdimere; Munaron, Jean-Marie; Lucena‐Frédou, Flávia; Frédou, Thierry

doi:10.1016/j.ecss.2021.107184

Cited by 16 publications

(14 citation statements)

References 70 publications

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“…As in other tropical estuaries, despite their economic, ecological, and social importance and inclusion in marine protected areas, the ecosystems analyzed here, have no official statistics or management proposition. In addition, the fisheries and other anthropogenic activities related to mangrove use (Pelage et al, 2021) are poorly regulated and reported, hampering ecosystem conservation and activity management. The structure in biomass flow and fishing along the trophic spectrum differed among the ecosystems studied.…”

Section: Discussionmentioning

confidence: 99%

“…The SCC is the most productive estuarine complex in Pernambuco, with high fish biodiversity (Merigot et al, 2016) and essential small-scale fishery activity crucial for the local economy (Andrade and Silva, 2013;CPRH, 2010). SCC has a complex trophic web supported by high energy and biomass flows between estuarine and marine organisms (Figueiredo et al, 2006;Pelage et al, 2021;Vasconcelos Filho et al, 2003. As elsewhere, this estuarine system is affected by human occupation and has gradually become altered due to anthropogenic activities (Blaber and Barletta, 2016), which may change its productivity, biodiversity, and, consequently, its trophic interactions.…”

Section: Introductionmentioning

confidence: 99%

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Effect of fishing effort on the trophic functioning of tropical estuaries in Brazil

Lira

Lucena‐Frédou

Lacerda³

et al. 2022

Estuarine, Coastal and Shelf Science

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of fishing effort on the trophic functioning of tropical estuaries in Brazil

Lira

Lucena‐Frédou

Lacerda³

et al. 2022

Estuarine, Coastal and Shelf Science

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“…Such lower d 13 C values suggested the prevalence of organic matter derived from terrestrial and marsh plants within the intermittently open lagoons. Several studies have reported that the connection or separation of the lagoon from the ocean by geomorphological characteristics can result in changes in the POM composition due to seasonal and spatial variations in the distribution and productivity of primary producers (Hoeinghaus et al, 2011;Escalas et al, 2015;Pelage et al, 2021). Thus, the isotopic difference in POM between the two lagoons is likely due to the differences in the mixing degree of seawater and freshwater by the geomorphology for physical connectivity with the adjacent coast.…”

Section: Spatial and Temporal Variability In The Biogeochemical Chara...mentioning

confidence: 99%

Seasonal variations in biochemical and stable isotope compositions of particulate organic matter in two contrasting temperate coastal lagoons of Korea

et al. 2022

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The geomorphology of coastal lagoons has an important effect on the hydrological balance between fresh water and seawater, which exhibit a wide range of salinity from nearly fresh water to hypersaline water. The present study aimed to characterize seasonal biogeochemical properties of suspended particulate organic matter (POM) in response to environmental variability driven by hydrological dynamics in contrasting coastal lagoon systems. We selected two lagoons distinguished by their geomorphological features, a permanently open artificial lagoon (Gyeongpoho) and an intermittently open natural lagoon (Hyangho), analyzed environmental characteristics, and compared the seasonal differences in the biochemical compositions of POM. Variations in temperature and precipitation in both lagoons showed the characteristics of a typical monsoon climate but variation in salinity differed 6.5−35.0 in Gyeongpoho and 1.1−10.8 in Hyangho. A self-organizing map analysis using the environmental data revealed that the spatiotemporal variations in salinity and nutrient concentrations differed significantly between the two lagoon systems, indicating a difference in hydrologic connectivity between lagoons and marine systems. Furthermore, a canonical correlation analysis highlighted that the POM properties differed according to physicochemical factors. The differing environmental conditions may affect the spatial and temporal variations in organic matter composition, resulting in significant differences in the biochemical composition of POM between two lagoon systems. Overall, this information provides insight into the origin and transport process of POM under changing coastal lagoon environments caused by climatic and human activities.

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“…In recent years, estuarine ecosystems have been considerably altered by global climate change (Gillanders et al, 2011;Scanes et al, 2020) and intense anthropogenic activities (Wang et al, 2022), such as important habitat reclamation, upstream dam construction (Ferguson et al, 2011), overfishing since the 1990s (Wang et al, 2022), spawning and nursing habitat deterioration, and migratory corridor breakdown (Cowen and Sponaugle, 2009). The coupled effects of natural and human activities have altered the temperature, salinity, pH, and nutrients as well as the heterogeneity of seawater characteristics (depending on the mixing process of fresh and salty water) (Pelage et al, 2021). Additionally, it has adversely accelerated the mixing process and promoted the fragmentation of the physical and chemical properties of water columns (Wu and Wu, 2018).…”

Section: Introductionmentioning

confidence: 99%

Delineation of estuarine ecological corridors using the MaxEnt model to protect marine fishery biodiversity

Zhao²,

Liu³

et al. 2022

Front. Mar. Sci.

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Ecological corridors (ECs) are important management tools to protect biodiversity by linking fragile habitats, especially for highly mobile organisms. ECs in terrestrial landscapes work as passages on land or in water. However, the significance of ECs to migratory species in estuaries has not been well elucidated. Based on annual fishery investigation in the Yangtze estuary and their dominance index rank, three of the top five species, including Larimochthys polyactis, Coilia mystus, and Gobiidae, exhibited absolute dominance in spring during the past 5 years. The temporal and spatial density variance of C. mystus supported its short-distance migration pattern. Redundancy analysis and the MaxEnt model predicted optimum habitats for C. mystus. C. mystus larvae survival was significantly related to salinity, total nitrogen, pH, reactive silicate, dissolved oxygen, surface water temperature, and chlorophyll-a in May and to salinity, surface water temperature, permanganate index, suspended particles, total nitrogen, and total phosphorus in August. The MaxEnt model predicted a broader longitudinal distribution range from offshore to the upstream freshwater area but narrower latitudinal distribution in the southern branch in May than in August. Finally, we delineated migratory corridors connecting optimum habitats for C. mystus using the least-cost route method. Optimum habitats close to the coastlines in the south branch might play a significant role in maintaining population or community connectivity in the Yangtze estuary. Our findings provide a perspective and method to quantify and facilitate the harmonious development of socioeconomy and fishery biodiversity conservation.

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Importance of estuary morphology for ecological connectivity with their adjacent coast: A case study in Brazilian tropical estuaries

Cited by 16 publications

References 70 publications

Effect of fishing effort on the trophic functioning of tropical estuaries in Brazil

Effect of fishing effort on the trophic functioning of tropical estuaries in Brazil

Seasonal variations in biochemical and stable isotope compositions of particulate organic matter in two contrasting temperate coastal lagoons of Korea

Delineation of estuarine ecological corridors using the MaxEnt model to protect marine fishery biodiversity

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