Tropical freshwater sciences: an overview of ongoing tropical research

Ramírez, Alonso; Ardón, Marcelo; Douglas, Michael M.; Graça, Manuel A. S.

doi:10.1086/681257

Cited by 8 publications

(9 citation statements)

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“…Reviews on C processing in streams, rivers, lakes, and estuaries (Bernot et al 2010; Marcarelli et al 2011; Hoellein et al 2013) and on whole stream metabolism (Finlay 2011) have been completed, though focused on temperate ecosystems. Greater number of studies of freshwater metabolism from streams and rivers is part of a growing literature in tropical ecology (Ramírez et al 2015; Riveros‐Iregui et al 2018) and an important contribution to the field as there are increasing threats to tropical freshwater ecosystems, including reduced hydrologic connectivity, pollution, hydropower development, and biodiversity loss (Encalada et al 2019). Specifically, we evaluated the effect of watershed area, nutrients, rainfall, and temperature on stream ecosystem metabolism, evaluated potentially associated physical and chemical parameters, and use a structural equation model to explore how multiple variables control GPP and ER.…”

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Ecosystem metabolism in tropical streams and rivers: a review and synthesis

Marzolf

Ardón

2021

Limnology & Oceanography

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Ecosystem metabolism of freshwater ecosystems has been studied for several decades, with theory and synthesis largely derived from temperate streams and rivers in North America and Europe. Advances in sensor technology and modeling have opened a wider range of streams to be included to test theories beyond temperate streams. In this paper, we review and synthesize ecosystem metabolism data from tropical streams and rivers to determine to what extent the constraints of metabolism measured in temperate streams are similar in tropical streams. We compiled 202 measurements of gross primary productivity (GPP) and ecosystem respiration (ER) from 83 tropical streams spanning 22.2 S to 18.4 N. Overall, tropical streams were heterotrophic (ER > GPP), with GPP ranging from 0.01 to 11.7 g O 2 m −2 d −1 and ER ranging from −0.2 to −42.1 g O 2 m −2 d −1 , similar on average to rates reviewed from temperate streams, but with higher maximum ER in tropical streams. Gross primary productivity increased with watershed area; a result also observed in temperate streams. ER decreased with elevated phosphorus and higher annual rainfall. We constructed a structural equation model that explained greater variation of ER (74%) than GPP (26%), and reflects similar drivers, such as land-use and watershed area, as in temperate streams. We conclude that tropical stream ecosystem metabolism has similar drivers as temperate streams, and a warmer and wetter climate and human use of tropical lands will influence metabolic rates in streams.

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Ecosystem metabolism in tropical streams and rivers: a review and synthesis

Marzolf

Ardón

2021

Limnology & Oceanography

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“…, Ramírez et al. ). This is particularly apparent in South‐East Asia, where rising world demand for palm oil is driving deforestation.…”

Section: Introductionmentioning

confidence: 99%

“…In spite of this phenomenon, large areas of the South‐East Asia tropics are not being actively studied (Ramírez et al. ). This includes Borneo, an island that is home to one of the oldest rain forests in the world.…”

Section: Introductionmentioning

confidence: 99%

“…Human activities are increasing the urgency for investigating the basic tropical stream ecology (Dolný et al 2011, Dudgeon 2015, Lewis et al 2015, Ramírez et al 2015. This is particularly apparent in South-East Asia, where rising world demand for palm oil is driving deforestation.…”

Section: Introductionmentioning

confidence: 99%

“…This is particularly apparent in South-East Asia, where rising world demand for palm oil is driving deforestation. In spite of this phenomenon, large areas of the South-East Asia tropics are not being actively studied (Ramírez et al 2015). This includes Borneo, an island that is home to one of the oldest rain forests in the world.…”

Section: Introductionmentioning

confidence: 99%

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Fluvial biotopes influence macroinvertebrate biodiversity in South‐East Asian tropical streams

et al. 2016

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Abstract. Given the widespread degradation of aquatic systems caused by land-use changes associated with palm oil production in South-East Asia, it is imperative to identify and study the remaining undisturbed rivers and streams. Stream macroinvertebrates are reliable indicators of environmental health. Linking the community structure of these organisms to natural hydraulic and geomorphic conditions (categorized as biotopes) is vital for the conservation and restoration of streams. This study characterizes the effects of biotopes on macroinvertebrate community structure in three streams within Ulu Temburong National Park in northern Borneo. Biotopes within these streams were categorized as either bedrock (waterfalls and cascades) or mixed substrate (riffles and pools). In total, 119 taxa were collected from all sampled biotopes, but not all taxa were collected from each stream. Biotopes were statistically distinct in terms of taxonomic richness, but not mean individual density or average community biomass. There were differences in community structure between waterfalls, cascades, pools, and riffles. The survey suggests that pool and riffle biotopes were more vulnerable to scouring flows and had similar community structure, while waterfalls and cascades likely experienced lower sheer stress during floods and had similar macroinvertebrate communities. This study has found that classification and mapping of macroinvertebrates with biotope theory in pristine, tropical streams is a useful framework for simplifying the many linkages between ecology, geomorphology, and hydrology. These natural patterns increase our understanding of tropical streams and can be used to assess the impacts of forest degradation.

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2020

Freshwater Ecology

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Tropical freshwater sciences: an overview of ongoing tropical research

Cited by 8 publications

References 27 publications

Ecosystem metabolism in tropical streams and rivers: a review and synthesis

Ecosystem metabolism in tropical streams and rivers: a review and synthesis

Fluvial biotopes influence macroinvertebrate biodiversity in South‐East Asian tropical streams

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