Rainfall leads to habitat homogenization and facilitates plankton dispersal in tropical semiarid lakes

Brasil, Jandeson; Santos, Juliana B. O.; Sousa, Wanessa; Menezes, Rômulo S. C.; Huszar, Vera L. M.; Attayde, José Luiz

doi:10.1007/s10452-019-09738-9

Cited by 29 publications

(26 citation statements)

References 56 publications

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“…Thus, early-hydroperiod spatial patterns in small tropical organisms can be the result of historical contingencies (Castillo-Escrivà et al 2017b), such as consecutive homogenising flooding events (or heavy rain periods) that shifted connectivity at regional scale, thus spatially structuring more connected areas in their passively dispersed organisms compared to others further away. These results suggest that space plays a more meaningful role, compared to environment, in tropical than in Mediterranean metacommunities, maybe not only by the reduced environmental gradients but also because of dispersal limitation (Janzen 1967) or because of higher connectivity and dispersal surplus (Thomaz et al 2007, Heino et al 2015; Brasil et al 2020).…”

Section: Discussionmentioning

confidence: 88%

“…Hydrology plays a key role in aquatic freshwater tropical ecosystems. Annual floods during the wet season drive connectivity changes, homogenizing environmental conditions and biological communities (Thomaz et al 2007; Brasil et al 2020). Thus, early-hydroperiod spatial patterns in small tropical organisms can be the result of historical contingencies (Castillo-Escrivà et al 2017b), such as consecutive homogenising flooding events (or heavy rain periods) that shifted connectivity at regional scale, thus spatially structuring more connected areas in their passively dispersed organisms compared to others further away.…”

Section: Discussionmentioning

confidence: 99%

“…In this sense, some studies found that temperate communities were more environmentally controlled than tropical ones, which were more spatially structured (Myers et al 2013; Souffreau et al 2015). In addition, massive floods during the rainy season increase the aquatic connectivity in the tropical regions (Junk et al 1989; Bunn et al 2006; Larsen et al 2019), reducing dispersal limitation and homogenizing local communities (Thomaz et al 2007; Brasil et al 2020), and contrasting with the more intense isolation of the Mediterranean region.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, some studies found that temperate communities were more environmentally controlled than tropical ones (Myers et al 2013;Souffreau et al 2015). In the case of aquatic habitats, massive floods during the rainy season increase aquatic connectivity in tropical areas (Junk et al 1989;Bunn et al 2006;Larsen et al 2019), reducing dispersal limitation and homogenizing local communities (Thomaz et al 2007;Brasil et al 2020), and contrasting with the more intense isolation of water bodies in the mediterranean-climate region. In both tropical and mediterranean systems, we may then expect that metacommunity structure is a result of dynamic switches between dispersal limitation and environmental filtering through time (Jacobson and Peres-Neto.…”

Section: Introductionmentioning

confidence: 99%

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Metacommunities from bacteria to birds: stronger environmental selection in mediterranean than in tropical ponds

Gálvez

Castillo‐Escrivà

et al. 2021

Preprint

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The metacommunity concept provides a theoretical framework that aims at explaining organism distributions by a combination of environmental filtering, dispersal and drift. With the development of statistical tools to quantify and partially isolate the role of each of these processes, empirical metacommunity studies have multiplied worldwide. However, few works attempt a multi-taxon approach and even fewer compare two distant biogeographical regions using the same methodology. Under this framework, we tested the expectation that temperate (Mediterranean) pond metacommunities would be more influenced by environmental and spatial processes than tropical ones, because of stronger environmental gradients and higher isolation of waterbodies.We surveyed 30 tropical and 32 Mediterranean temporary ponds and obtained data on 49 environmental variables (including limnological, hydrogeomorphological, biotic, climatic, and landscape variables). We characterized the biological communities of Bacteria and Archaea (from the water column and the sediment), phytoplankton, zooplankton, benthic invertebrates, amphibians and birds, and estimated the relative role of space and environment on metacommunity organization for each group and region, by means of variation partitioning using Generalized Additive Models (GAMs).The residual (unexplained) variation was larger in tropical pond metacommunities, suggesting a higher role for stochastic processes and/or effects of unmeasured processes such as biotic interactions in the tropics. Environmental filtering was important in both tropical and Mediterranean ponds, but markedly stronger in the latter, probably related to higher environmental heterogeneity. The variability between taxonomic groups in spatial and environmental contributions was very wide, and only some similarities between geographic settings were observed for the environmental effects of passively dispersing organisms, with rotifers and diatoms being among the most and least affected by the abiotic environment, respectively, in both areas. Overall, these results provide support, in a wide variety of aquatic organisms, for the classical view of stronger abiotic niche constraints in temperate areas compared to the tropics.

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metacommunities from bacteria to birds: stronger environmental selection in mediterranean than in tropical ponds

Gálvez

Castillo‐Escrivà

et al. 2021

Preprint

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“…However, present study of identifying the relative influence of environmental parameters on Chl-a concentration shows water temperature (33.13 % of R 2 ) as the most significant variable followed by TA (29.5 % of R 2 ) and TDS (23.1 % of R 2 ). Rainfall plays a vital role in mixing of environmental variables and also responsible for physical dispersal of phytoplankton in wetlands of tropical semiarid region (Brasil et al, 2020), hence resulting into considerable reduction in chlorophyll concentration. At the same time, rainfall did not contribute as influential climatological parameter in the present study.…”

Section: Discussionmentioning

confidence: 99%

Effect of climato-environmental parameters on chlorophyll a concentration in the lower Ganga basin, India

Sarkar

Naskar

et al. 2020

RBT

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Introduction: Chlorophyll a concentration proxies the phytoplankton biomass which directly involves in signifying the production functions of aquatic ecosystem. Thus, it is imperative to understand their spatio-temporal kinetics in lotic environment with reference to regional climatic variabilities in the tropical inland waters. Objective: In-situ studies were conducted to examine the changes in phytoplankton biomass in lower Ganga basin as influenced by various environmental parameters under regional climatic variability during 2014-2016. Methods: Firstly, the most key influential environmental parameters on riverine Chl-a concentration were determined. Then the direct cascading effect of changing climatic variables on key environmental parameters were derived through modeling and quantified probable changes in mean Chl-a concentration in the lower stretch of river. Results: Only five environmental parameters namely water temperature, total dissolved solid, salinity, total alkalinity and pH were key factors influencing Chl-a (Multiple R2: 0.638, P < 0.05). Present estimates indicate that if the present rate of regional climatic variability over the last 3 decades (mean air temperature + 0.24 °C, total annual rainfall -196.3 mm) remain consistent over the next three decades (2015-2045), an increase in mean Chl-a by + 170 µgL-1 may likely be expected grossly reaching about 475.94 µg L-1 by the year 2045 or more. Conclusions: The present study is first such comprehending a gross hint towards the probable ecosystem response with an alternative model based methodology in data-deficient situations. Subsequently, the output would also be of great benefit for increase water governance and developing strategy protocol for sustainable water management for greater ecosystem services.

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Inconsistent response of taxonomic groups to space and environment in mediterranean and tropical pond metacommunities

Gálvez

Peres‐Neto

Castillo‐Escrivà

et al. 2022

Ecology

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The metacommunity concept provides a theoretical framework that aims at explaining organism distributions by a combination of environmental filtering, dispersal, and drift. However, few works have attempted a multitaxon approach and even fewer have compared two distant biogeographical regions using the same methodology. We tested the expectation that temperate (mediterranean-climate) pond metacommunities would be more influenced by environmental and spatial processes than tropical ones, because of stronger environmental gradients and a greater isolation of waterbodies. However, the pattern should be different among groups of organisms depending on their dispersal abilities. We surveyed 30 tropical and 32 mediterranean temporary ponds from Costa Rica and Spain, respectively, and obtained data on 49 environmental variables. We characterized the biological communities of bacteria and archaea (from the water column and the sediments), phytoplankton, zooplankton, benthic invertebrates, amphibians and birds, and estimated the relative role of space and environment on metacommunity organization for each group and region, by means of variation partitioning using generalized additive models.Purely environmental effects were important in both tropical and mediterranean ponds, but stronger in the latter, probably due to their larger limnological heterogeneity. Spatially correlated environment and pure spatial effects were greater in the tropics, related to higher climatic heterogeneity and dispersal processes (e.g., restriction, surplus) acting at different scales. The variability between taxonomic groups in the contribution of spatial and environmental factors to metacommunity variation was very wide, but higher in active,

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Rainfall leads to habitat homogenization and facilitates plankton dispersal in tropical semiarid lakes

Cited by 29 publications

References 56 publications

Metacommunities from bacteria to birds: stronger environmental selection in mediterranean than in tropical ponds

Metacommunities from bacteria to birds: stronger environmental selection in mediterranean than in tropical ponds

Effect of climato-environmental parameters on chlorophyll a concentration in the lower Ganga basin, India

Inconsistent response of taxonomic groups to space and environment in mediterranean and tropical pond metacommunities

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