Response of epilithic diatom communities to environmental gradients along an Ecuadorian Andean River

Castillejo, Pablo; Chamorro, Susana; Paz, L. de; Heinrich, Carla Giselda; Carrillo, Ivonne; Salazar, José; Navarro, Juan Carlos; Lobo, Eduardo A.

doi:10.1016/j.crvi.2018.03.008

Cited by 27 publications

(14 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Many studies have been carried out to determine the trophic weight and indicator levels of diatom assemblages in different ecoregions (e.g., Rott et al, 1999;Dell'Uomo, 2004;Kelly et al, 2008;Lobo et al 2004Lobo et al , 2015Çelekli et al, 2019b;Salinas-Camarillo et al, 2020). Responses of epilithic diatom assemblages to pollution gradient give crucial information to predict the health of lotic ecosystems (Lobo et al, 2010;Böhm et al, 2013;Heinrich et al, 2015;Castillejo et al, 2018). According to their occurrence/succession in different environmental gradients, diatom taxa are considered as pollution sensitive, intermediate pollution tolerant, and pollution tolerant species based on their trophic weights from various diatom indices (Table 1).…”

Section: Diatom Indicesmentioning

confidence: 99%

Bioassessment of water quality of surface waters using diatom metrics

Çelekli¹,

Lekesiz²,

Yavuzatmaca³

2021

Turk J Bot

View full text Add to dashboard Cite

Bioassessment of surface waters is one of the most important approaches to predict the deterioration of ecosystems and achieve environmental sustainability according to the application of the European Water Framework Directive. The present review emphasizes the importance of the bioassessment of freshwater quality especially running waters based on diatom metrics. Nutrient enrichment and hydromorphological alternation driven by human activities are the main factors for the ecological compromise of freshwater ecosystems. Currently, the bioassessment of the ecological condition of inland water bodies is adopted worldwide. Bioassessment is complementary to physico-chemical and hydromorphological data for evaluating the ecological conditions of rivers; however, measuring all the physical and chemical changes is expensive and impractical. Therefore, monitoring biota helps to determine the changes occurring in ecosystems. Thus, diatoms are used as bioindicators to assess environmental conditions of the ecosystems, but their use requires great taxonomic knowledge, otherwise, the results will be biased. Many diatom indices have been developed based on the trophic weight and indicator values of diatoms in different ecoregions in the last decades. This review highlights the importance and advantages of using diatom metrics in the bioassessment of the ecological status of surface waters in the different ecoregions, especially running water. To analyze the complex response of diatom communities to environmental gradients and assess the quality of the ecosystem, multivariate statistical approaches are needed.The challenge here is how to define criteria for classes of water bodies in a biologically meaningful way. For this reason, Biological Condition Gradient is suggested as an appropriate and effective approach to develop trophic criteria based on the relationships between nutrient concentrations and biological indicators of ecological conditions.

show abstract

Section: Diatom Indicesmentioning

confidence: 99%

Bioassessment of water quality of surface waters using diatom metrics

Çelekli¹,

Lekesiz²,

Yavuzatmaca³

2021

Turk J Bot

View full text Add to dashboard Cite

show abstract

“…Estos estudios, por lo tanto, se constituyen en el primer paso para el desarrollo de índices regionales eficientes. En Colombia, por ejemplo, Heinrich et al (2018) Castillejo et al (2018) estudiaron la respuesta de las comunidades de diatomeas epilíticas a gradientes ambientales en un río andino, destacando que este trabajo fue el primer intento en el país de determinar la composición de las comunidades de diatomeas epilíticas asociadas con diferentes grados de eutrofización. Esto se logró mediante la medición de variables físicas, químicas y microbiológicas en cinco sitios de muestreo a lo largo del río Pita, Ecuador, de agosto a diciembre de 2016.…”

Section: Itqaunclassified

Diatomeas como bioindicadores: Aspectos ecológicos de la respuesta de las algas a la eutrofización en América Latina

2019

View full text Add to dashboard Cite

En este trabajo se discute la importancia taxonómica y ecológica de las diatomeas epilíticas como organismos indicadores de la calidad del agua en sistemas lóticos de América Latina, destacando algunos aspectos ecológicos de la respuesta de estas algas a la eutrofización. Dentro de los índices bióticos, se presenta y discute el Índice de diatomeas pampeanas (IDP) desarrollado por Gómez & Licursi (2001) para la región pampeana de Argentina, y el Índice Trófico de Calidad del Agua (ITCA) para sistemas lóticos subtropicales y templados en Brasil, propuesto por Lobo et al. (2015). En países tropicales como Colombia, Costa Rica y Ecuador, los resultados de investigaciones recientes que buscan establecer la tolerancia de diatomeas a la eutrofización sugieren, en general, una falta de concordancia con los valores tróficos de tolerancia de especies disponibles en la literatura científica. En la Cuenca de México, Salinas (2017) presenta el Índice de Diatomeas para la Calidad del Ecosistema (DEQI), destacando que este trabajo fue el primero en proponer un índice numérico para evaluar la calidad de los ecosistemas en función de la caracterización de la comunidad de las diatomeas epilíticas en los ríos del centro de México.

show abstract

“…However, there is little floristic information on diatoms available for Central America (e.g. Hustedt 1953, Michels-Estrada 2003, Castillejo et al 2018 and the Tibetan Plateau (e.g. Zhu & Chen 1995.…”

Section: Introductionmentioning

confidence: 99%

Three new needle-shaped Fragilaria species from Central America and the Tibetan Plateau

et al. 2021

View full text Add to dashboard Cite

Three new needle-shaped Fragilaria species from freshwater lake Apastepeque in El Salvador (Fragilaria salvadoriana sp. nov., F. maarensis sp. nov.) and subsaline lake Nam Co on the Tibetan Plateau (F. huebeneri sp. nov.) are described and compared based on light and scanning electron microscopy observations and morphometric analyses. Fragilaria salvadoriana sp. nov. is characterized by narrowly linear-lanceolate, sometimes centrally constricted valves, subcapitate to rarely capitate apices, and a distinct, dented appearing central area. Striae are composed of 2−5 occluded areolae. It can be differentiated from similar needle-shaped species by the valve outline, relatively low striae density, and shark fin-shaped spines. Characteristic of F. maarensis sp. nov. are a very narrowly lanceolate valve outline and subcapitate apices. The apical pore field is composed of 2–3 rows of poroids and acute, irregularly oriented spines are present at the junction between valve face and mantle. This taxon is clearly different from other Fragilaria species, displaying a high length-to-width ratio and a low number of areolae per stria. The Tibetan species, F. huebeneri sp. nov., forms long ribbon-like colonies linked together by spatula-shaped spines. Valves have subcapitate apices, a spindle- to needle-shaped outline and an indistinct central area. Striae are alternate and composed of 3–5 areolae per stria. Teratological forms of F. huebeneri sp. nov. were commonly observed in the sediment trap samples. Fragilaria salvadoriana sp. nov. and F. maarensis sp. nov. were found in a warm, tropical crater lake characterized by low conductivity and dissolved oxygen content, medium alkaline pH, and magnesium-calcium-bicarbonate-rich waters. Fragilaria huebeneri sp. nov. was frequent in a large, high elevation lake with increased specific conductivity, alkaline pH and sodium-bicarbonate-rich waters. The new species are compared to morphologically similar species from the genus Fragilaria Lyngbye and ecological preferences are discussed.

show abstract

Response of epilithic diatom communities to environmental gradients along an Ecuadorian Andean River

Cited by 27 publications

References 23 publications

Bioassessment of water quality of surface waters using diatom metrics

Bioassessment of water quality of surface waters using diatom metrics

Diatomeas como bioindicadores: Aspectos ecológicos de la respuesta de las algas a la eutrofización en América Latina

<p><strong>Three new needle-shaped <em>Fragilaria</em> species from Central America and the Tibetan Plateau</strong></p>

Contact Info

Product

Resources

About