Recovery of black-necked swans, macrophytes and water quality in a Ramsar wetland of southern Chile: Assessing resilience following sudden anthropogenic disturbances

Jaramillo, Eduardo; Lagos, Nelson A.; Labra, Fabio A.; Paredes, Enrique; Acuña, Emilio; Melnick, Daniel; Manzano, Mario; Velásquez, Carlos; Duarte, Cristián

doi:10.1016/j.scitotenv.2018.01.333

Cited by 17 publications

(24 citation statements)

References 44 publications

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“…consequence from a pulse disturbance event caused by the initial industrial operations of a pulp mill plant located upstream from the Río Cruces wetland (Escaida et al 2015;UACh 2015). The recovery processes begun in 2012 (Jaramillo et al 2018a(Jaramillo et al , 2018b and today, nearly 14 years after the disturbance, the population abundances and health conditions of swans, the spatial cover of the aquatic plant E. densa, and the transparency of waters across the wetland have recovered to their initial undisturbed state. The abundance of the affected biotic components of the wetland appear to be healthy (UACh, 2015(UACh, , 2017 and include biotic components such as macrophytes, fi shes, and river shrimps, amongst others (Lagos et al 2008).…”

Section: Short Communicationmentioning

confidence: 99%

“…Furthermore, the importance of tidal variability in coastal wetlands was emphasized in the workshop by Dr. Mario Pino (Universidad Austral de Chile). Associated studies from this research group along the Río Cruces wetland (UACh 2015) addressed the re-suspension of iron-enriched sediments causing deterioration of sanitary conditions in aquatic macrophytes during the pulse disturbance event of 2004 and subsequent cascading effects on population abundances, body weights and liver conditions of Black-necked swans (Jaramillo et al 2018a(Jaramillo et al , 2018b.…”

Section: Short Communicationmentioning

confidence: 99%

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Ecosystem processes, management and human dimension of tectonically-influenced wetlands along the coast of central and southern Chile

et al. 2019

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A Workshop on Coastal Wetlands of Chile was held at Universidad Austral de Chile (Valdivia. november 2017). It was discussed the impact of earthquakes and tsunamis along this coast and their implication for wetlands. These events produce major modifi cations associated with variable rates of resilience. Emphasis was placed on social dimensions of such disturbances considering their impact on ecosystem services. Societal resilience must be included within the scales of wetland recovery, and incorporated in conservation and management strategies.

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Section: Short Communicationmentioning

confidence: 99%

Section: Short Communicationmentioning

confidence: 99%

Ecosystem processes, management and human dimension of tectonically-influenced wetlands along the coast of central and southern Chile

et al. 2019

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“…The preserved wetlands are home to rare and endangered bird species that need protection. Accumulation of heavy metals in the habitat has a negative impact on birds, contributes to disease and death of birds [7]. Pollution of the environment with heavy metals leads to a violation of the reproductive function of birds and a decrease in the growth rate of Chicks [8].…”

Section: Introductionmentioning

confidence: 99%

Ecological and chemical characteristics of small river Arguzikha (Zeya-Bureya plain, Russia)

Пакусина

Платонова

2020

E3S Web Conf.

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The article considers the results of research from 2015 to 2019 on the study of hydrochemical indicators and the content of heavy metals in the ecosystem components of the small Arguzikha river , a left-Bank tributary of the Amur river (water, bottom sediments, macrophytes, birds ’ feathers). High oxygen content in the water (8.8-15.9 mgO2/dm3) and high BOD5 values (6-12 mgO2/dm3) in the middle and lower reaches of the Arguzikha river indicate the process of eutrophication. The value of permanganate oxidability (6.8-15.5 mgO/dm3) characterizes the high content of organic substances in water. In the spring, nitrate nitrogen (3.45-6.39 mgN-NO3-/dm3) was found in the water of the Arguzikha river, which had a pyrogenic origin. In the summer the rainy season was dominated by ammonium nitrogen (2.34 mgN-NН +/dm3). The high content of total phosphorus (0.337-0.609 mg/dm3) in the river water was in the spring. In the spring of 2015, the concentration of lead in the lower reaches of the river reached 6.36 µg/dm3, during the subsequent time, the lead content in the Arguzikha water was less than the MPC. Toxic concentrations of lead (> 30 mg / kg) and manganese (> 300 mg/kg) were found in macrophytes of Nymphoides peltata and Myriophyllum spicatum. In the feathers of waterfowl of the Arguzikha river the content of heavy metals decreases in a row Fe>Zn>Cu>Pb>Mn>Сг>Ni>Cо>Cd. The feathers of Anas acuta and Anas querquedula contained Pb 17.7 mg/kg and 22.2 mg/kg, Cd 0.15 mg/kg and 0.08 mg/kg, respectively.

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“…40°S, Fig. 1), caused sudden changes in its water quality (UACh 2005;Escaida et al 2014;Jaramillo et al 2018). These changes resulted in a dramatic decrease in the population abundance of the aquatic plant Egeria densa, which was limited to restricted areas around few tributary rivers of the wetland.…”

Section: Introductionmentioning

confidence: 99%

Resilience of an aquatic macrophyte to an anthropogenically induced environmental stressor in a Ramsar wetland of southern Chile

Jaramillo

Duarte

Labra

et al. 2018

Ambio

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In mid-2004, anthropogenically induced changes in water quality of the Río Cruces wetland, a Ramsar site located in southern Chile (ca. 40°S), enhanced the resuspension of iron-enriched sediments, which were subsequently deposited over the most abundant aquatic macrophyte of the wetland (Egeria densa Planch. 1849). This event triggered the formation of brownish, necrotic patches and increased iron contents in the leaves and stems of E. densa, which contributed to a significant demise of the plant within the wetland. In this study, we estimate the recovery time as a proxy for resilience of this macrophyte at organismal and population levels. Macro- and micro-optical characteristics, as well as iron contents in tissues of E. densa, were documented in four time windows (2004, 2008, 2012, and 2014). In addition, the size of the macrophyte population and its spatial occurrence were monitored from 2008 to 2016 across 36 study sites within the wetland. Our results suggest necrotic patches and high iron contents in E. densa persisted at least until 2008. After 2013, a significant increase in the spatial occurrence of E. densa was observed within the wetland, reaching full recovery of the population during 2015. The health of plant tissues and iron contents in leaves and stems showed recovery period close to 4 years, while the recovery of the spatial occurrence of E. densa took approximately 9 years. While the monitoring of plant health was not performed on a strict annual basis, the recovery rates estimated here are slower than those described for other macrophytes. This finding might reflect the long-lasting effects of the disturbance from 2004 and the interaction with biotic processes, such as foraging by waterbirds recolonizing the Río Cruces wetland. These results show that full recovery of E. densa was achieved through a cascade of effects starting with abiotic factors (water quality) and passing through physiological and individual levels, to finally reach the population level. A key aspect of this response is the invasive nature of the macrophyte, which likely contributed to its recovery as a consequence of improved water quality. Less successful macrophyte species in other systems may not reach the specific population recovery, and become subdominant species instead, or even be eradicated from the wetland either as the result of herbivory or due to competition with other macrophytes.

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Recovery of black-necked swans, macrophytes and water quality in a Ramsar wetland of southern Chile: Assessing resilience following sudden anthropogenic disturbances

Cited by 17 publications

References 44 publications

Ecosystem processes, management and human dimension of tectonically-influenced wetlands along the coast of central and southern Chile

Ecosystem processes, management and human dimension of tectonically-influenced wetlands along the coast of central and southern Chile

Ecological and chemical characteristics of small river Arguzikha (Zeya-Bureya plain, Russia)

Resilience of an aquatic macrophyte to an anthropogenically induced environmental stressor in a Ramsar wetland of southern Chile

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