Zooplankton community structure in a highly turbid environment (Charente estuary, France): Spatio-temporal patterns and environmental control

Moderan, Julien; Bouvais, Pierre; David, Valérie; Noc, Sandrine Le; Simon-Bouhet, Benoît; Niquil, Nathalie; Miramand, Pierre; Fichet, Denis

doi:10.1016/j.ecss.2010.04.002

Cited by 53 publications

(12 citation statements)

References 64 publications

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“…We believe this to be likely for the present study, given that the study regions (Arcachon, Oléron, Brittany, Mediterranean) have similar predators (zooplankton, e.g. Jamet, Boge, Richard, Geneys, & Jamet, 2001;Modéran et al, 2010;Tortajada et al, 2012) and parasites (viruses, e.g. Ory et al, 2010;fungi).…”

Section: F I G U R Ementioning

confidence: 84%

Strong self‐regulation and widespread facilitative interactions in phytoplankton communities

Picoche

Barraquand

2020

Journal of Ecology

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1. The persistence of phytoplanktonic diversity in spite of competition for basic resources has long been a source of wonder and inspiration to ecologists. To sort out, among the many coexistence mechanisms suggested by theory and experiments, which ones actually maintain diversity in natural ecosystems, long-term field studies are paramount. 2. We analysed a large dataset of phytoplankton abundance time series using dynamic, multivariate autoregressive (MAR) models. Phytoplankton was counted and identified down to the genus level, every 2 weeks over 20 years, at 10 sites along the French coastline. MAR models allowed to estimate biotic interaction networks while also accounting for abiotic variables that may drive part of the phytoplankton fluctuations. We then analysed the ratio of intra to intertaxa interactions (a measure of niche differentiation), the frequency of negative versus positive interactions, and how stability metrics (both at the network and genus level) relate to network complexity and genus self-regulation or abundance. 3. We showed that a strong self-regulation, with competition strength within a taxon (genus) an order of magnitude higher than between taxa, was present in all phytoplanktonic interaction networks. This much stronger intragenus competition suggests that niche differentiation-rather than neutrality-is commonplace in phytoplankton. Furthermore, interaction networks were dominated by positive net effects between phytoplanktonic taxa (on average, more than 50% of interactions were positive). While network stability (sensu resilience) was unrelated to complexity measures, we unveiled links between self-regulation, intergenera interaction strengths and abundance. The less common taxa tend to be more strongly self-regulated and can therefore maintain in spite of competition with more abundant ones. 4. Synthesis. We demonstrate that strong niche differentiation, widespread facilitation between phytoplanktonic taxa and stabilizing covariances between interaction strengths should be common features of coexisting phytoplankton communities in the field. These are structural properties that we can expect to emerge from plausible mechanistic models of phytoplankton communities. We discuss mechanisms, such as predation or restricted microscale movement, that are consistent with these findings, which paves the way for further research.

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Section: F I G U R Ementioning

confidence: 84%

Strong self‐regulation and widespread facilitative interactions in phytoplankton communities

Picoche

Barraquand

2020

Journal of Ecology

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“…m −3 ) are within this range and, in comparison to other known South-western Atlantic populations (Table 2), cannot be considered either particularly abundant or scarce. Populations of this species elsewhere throughout its distribution also are within this abundance range (Stuart & Verheye, 1991; Gibbons & Stuart, 1994; Hossfeld, 1996; Champalbert et al ., 2007; Marques et al ., 2009), as are other estuarine and coastal chaetognaths worldwide (Reeve, 1964; Srinivasan, 1971; Nair, 1974; Grant, 1977; Nair et al ., 1981; Besiktepe & Unsal, 2000; Hernández et al ., 2005; Modéran et al ., 2010; Noblezada & Campos, 2012; Wu et al ., 2014).…”

Section: Discussionmentioning

confidence: 99%

The influence of environmental conditions onParasagitta friderici(Chaetognatha) abundance in a subtropical estuary (south Brazil)

2018

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Estuarine chaetognath population dynamics are poorly known worldwide. We have conducted eight seasonal campaigns (October 2007–August 2008) sampling three sectors in the subtropical Babitonga Bay estuary (26°S 48°W) in order to depict chaetognath abundance and population structure dynamics and test the influence of hydrography and food availability and type. Of three species sampled, Parasagitta friderici represented >93% of abundance in all samples and was examined in detail. There were no differences in P. friderici abundance between the sectors of the estuary, related to its high tolerance to low salinity, a feature not common for most chaetognath species. Salinity tolerance is an important adaptive characteristic to thrive within estuarine systems, and probably is responsible for the dominance of P. friderici in coastal and brackish water environments throughout most of its distribution. Juveniles dominated the population most of the year, except in February–April when abundances were lower and adults predominated. These results suggest that recruitment occurs continuously throughout the year, being more intense between October and January (spring to early summer) and in May (autumn) when densities and proportion of juveniles were higher. General Additive Models suggest that temperature and zooplankton biomass are significant (P < 0.05) factors influencing juvenile abundance while only the latter influenced the adults. We conclude that food availability is the most important driver in the studied population of P. friderici and recruitment peaks, which lead to high densities, seem to occur following peaks of their copepod prey along with particular temperature conditions (22–23°C).

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“…The variability of environmental features, especially salinity, is the main factor controlling the plankton distribution in an estuary (Laprise and Dodson, 1994). Estuarine zooplankton tend to occupy relatively welldefined salinity ranges in relation to their own osmoregulatory abilities (Modéran et al, 2010). Species composition of both phytoplankton and zooplankton varied along salinity gradient in estuarine areas Alden, 1990, 1993;Sautour and Castel, 1995;Tackx et al, 2004;Calliari et al, 2005;Islam et al, 2005;Muylaert et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Species composition of both phytoplankton and zooplankton varied along salinity gradient in estuarine areas Alden, 1990, 1993;Sautour and Castel, 1995;Tackx et al, 2004;Calliari et al, 2005;Islam et al, 2005;Muylaert et al, 2009). Accordingly, different zooplankton and phytoplankton communities were divided along salinity gradient in the estuarine waters Alden, 1990, 1993;Huang et al, 2004;Tan et al, 2004;Muylaert et al, 2009;Modéran et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Diversity and distribution of tintinnid ciliates along salinity gradient in the Pearl River Estuary in southern China

Wang

Chen

et al. 2019

Estuarine, Coastal and Shelf Science

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from upstream freshwaters to polyhaline waters. A total of 43 tintinnid species in 15 genera were identified. Freshwater, brackish and marine species occurred in sequence along salinity gradient. Tintinnopsis mayeri, T. tubulosa and Tintinnidium fluviatile were freshwater species. Fourteen and 15 tintinnid species were considered as brackish and marine species, respectively. The preferred salinity of freshwater species was < 3, and the abundance of freshwater species decreased along salinity gradient. Preferred salinity of brackish species ranged in 3-23. High abundance of brackish species occurred at mesohaline regions and decreased towards both oligohaline and polyhaline regions. Marine species abundance dropped sharply with the decrease of salinity, and seldom appeared when salinity was < 15. Tintinnid species richness was low at low salinity areas. With the increase of salinity, tintinnid species richness showed different variation patterns in different seasons. Tintinnid abundance showed bimodal-peak along salinity gradient. The first abundance peak was mainly contributed by brackish species and occurred where salinity was < 15. While the second abundance peak appeared where salinity was around 25 or > 30, which was mainly contributed by marine species. Low salinity, brackish and coastal tintinnid communities were divided based on the abundance percentage variations of different tintinnid types. Complexities of those communities increased along salinity gradient.

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Zooplankton community structure in a highly turbid environment (Charente estuary, France): Spatio-temporal patterns and environmental control

Cited by 53 publications

References 64 publications

Strong self‐regulation and widespread facilitative interactions in phytoplankton communities

Strong self‐regulation and widespread facilitative interactions in phytoplankton communities

The influence of environmental conditions onParasagitta friderici(Chaetognatha) abundance in a subtropical estuary (south Brazil)

Diversity and distribution of tintinnid ciliates along salinity gradient in the Pearl River Estuary in southern China

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