Estuarine habitats structure zooplankton communities: Implications for the pelagic trophic pathways

David, Valérie; Selleslagh, Jonathan; Nowaczyk, Antoine; Dubois, Sophie; Bachelet, Guy; Blanchet, Hugues; Gouillieux, Benoît; Lavesque, Nicolas; Leconte, Michel; Savoye, Nicolas; Sautour, Benoît; Lobry, Jérémy

doi:10.1016/j.ecss.2016.01.022

Cited by 28 publications

(18 citation statements)

References 75 publications

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“…Future research of tintinnid community variation along large salinity gradient in other estuaries is needed in order to elucidate whether there is different characteristics in other estuaries. the median zone was co-dominated by 2 copepods, while the downstream zone presented the highest diversity (David et al, 2016). The similar pattern was also observed in the Chikugo Estuary (Islam et al, 2005) and the Sendai Bay (Kazama and Urabe, 2016).…”

Section: Discussionsupporting

confidence: 76%

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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Section: Discussionsupporting

confidence: 76%

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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“…The gradient from freshwater to brackish and saltwater represents a significant shift in environmental conditions. Salinity has numerous implications for ion balance, biomineralization, larval food (zooplankton) abundance and composition (David et al, 2016), and exposure to different predators and parasites (Blasco-Costa, Koehler, Martin, & Poulin, 2013). Larvae migrating to higher salinity environments may benefit from greater productivity and resource availability (Gross, Coleman, & McDowall, 1988) and potentially reduced intraspecific competition (Lundberg, 1988), but may also experience mismatch effects due to the need to return to freshwater later in life.…”

Section: Introductionmentioning

confidence: 99%

Carryover effects of larval environment on individual variation in a facultatively diadromous fish

Saboret¹,

Ingram

2019

Ecology and Evolution

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Intraspecific trait variation may result from “carryover effects” of variability of environments experienced at an earlier life stage. This phenomenon is particularly relevant in partially migrating populations composed of individuals with divergent early life histories. While many studies have addressed the causes of partial migration, few have investigated the consequences for between‐individual variability later in life. We studied carryover effects of larval environment in a facultatively diadromous New Zealand fish, Gobiomorphus cotidianus, along an estuarine salinity gradient. We investigated the implications of varying environmental conditions during this critical stage of ontogeny for adult phenotype. We inferred past environmental history of wild‐caught adult fish using otolith microchemistry (Sr/Ca) as a proxy for salinity. We tested for main and interactive effects of larval and adult environment on a suite of traits, including growth rates, behavior (exploration and activity), parasite load, and diet (stable isotopes and gut contents). We found a Sr/Ca consistent with a continuum from freshwater to brackish environments, and with different trajectories from juvenile to adult habitat. Fish with Sr/Ca indicating upstream migration were more vulnerable to trematode infection, suggesting a mismatch to freshwater habitat. Diet analysis suggested an interactive effect of larval and adult environments on trophic position and diet preference, while behavioral traits were unrelated to environment at any life stage. Growth rates did not seem to be affected by past environment. Overall, we show that early life environment can have multiple effects on adult performance and ecology, with the potential for lifetime fitness trade‐offs associated with life history. Our study highlights that even relatively minor variation in rearing conditions may be enough to generate individual variation in natural populations.

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“…For example, infrequent pulses of prey due to seasonal dynamics and prey phenology can create temporary prey hotspots for predators (Croll et al 2005, Yang et al 2008. Further variation of prey abundance across space and time may be driven by major habitat tran-sitions, abiotic preferences of prey, environmental dynamics, and top-down effects of predators (Telesh & Khlebovich 2010, Lannin & Hovel 2011, David et al 2016. Some of the difficulties faced by mobile consumers that result from the heterogeneity of prey across seascapes are the risks of starvation and predation (Letcher & Rice 1997, Pitchford 2001.…”

Section: Introductionmentioning

confidence: 99%

“…Each of these sources have seasonal patterns, often creating large phytoplankton blooms followed by zooplankton blooms (Cloern 1996, Mackas et al 2012. In addition, zooplankton within an estuary are challenged by complicated hydrodynamic effects of tides and currents that interface with a variety of habitats to remain in their optimal environment (Palmer 1988, David et al 2016. For example, rising tides over intertidal areas can push pelagic zooplankton into high density patches (David et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, zooplankton within an estuary are challenged by complicated hydrodynamic effects of tides and currents that interface with a variety of habitats to remain in their optimal environment (Palmer 1988, David et al 2016. For example, rising tides over intertidal areas can push pelagic zooplankton into high density patches (David et al 2016). In contrast, benthic and epibenthic zooplankton are known to have higher site fidelity than pelagic species because they can bury or attach themselves to their substrate and avoid this redistribution (Palmer 1988).…”

Section: Introductionmentioning

confidence: 99%

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Integrating prey dynamics, diet, and biophysical factors across an estuary seascape for four fish species

Arbeider¹,

Sharpe²,

Carr‐Harris³

et al. 2019

Mar. Ecol. Prog. Ser.

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Estuary food webs support many fishes whose habitat preferences and population dynamics may be controlled by prey abundance and distribution. Yet the identity and dynamics of important estuarine prey of many species are either unknown or highly variable between regions. As anthropogenic development in estuaries increases, so does the need to understand how these environments may be supporting economically, culturally, and ecologically important fishes. Here, we examine how important estuary fishes integrate their prey across the seascape and what may influence prey dynamics. Specifically, we surveyed juvenile coho salmon Oncorhynchus kisutch, juvenile sockeye salmon O. nerka, Pacific herring Clupea pallasii, and surf smelt Hypomesus pretiosus diets along with zooplankton abundance in the estuary of the Skeena River (British Columbia, Canada) at a relatively fine scale. We found diets were highly variable, even within a species, but 1 or 2 prey composed most diet contents per species. Juvenile coho salmon primarily consumed terrestrial insects and larval fish, whereas sockeye salmon primarily consumed harpacticoid copepods. In contrast, small pelagic fish (Pacific herring and surf smelt) primarily consumed calanoid copepods, which were the most abundant prey in the environment. We found that certain prey groups were correlated with biophysical factors. For example, calanoid copepod abundance was positively correlated with salinity, whereas harpacticoid copepod abundance was highest over eelgrass sites. Identifying key prey species and how they distribute within the estuary seascape is an integral link in understanding the food-web foundation of fish habitat use in areas under pressure from anthropogenic development.

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Estuarine habitats structure zooplankton communities: Implications for the pelagic trophic pathways

Cited by 28 publications

References 75 publications

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

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

Carryover effects of larval environment on individual variation in a facultatively diadromous fish

Integrating prey dynamics, diet, and biophysical factors across an estuary seascape for four fish species

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