Phytoplankton grazing by epi- and infauna inhabiting exposed rocks in coral reefs

Yahel, Gitai; Zalogin, Tania; Yahel, Ruthy; Genin, Amatzia

doi:10.1007/s00338-005-0075-4

Cited by 9 publications

(5 citation statements)

References 36 publications

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“…The flux of phytoplankton-derived PON (PON p ) could be similarly estimated as the product of 10.10 6 3.78 and J MB Chl a . This empirically derived ratio of nitrogen : Chl a is at the upper end of the range (1.70-14.7) reported in previous studies (Yentsch and Vaccaro 1958;Wyatt et al 2010) and implies a C : N ratio below Redfield, yet within the range found in natural populations (Geider and La Roche 2002).…”

Section: Reef-scale Mass Balancesupporting

confidence: 72%

“…Controlled flume studies have been important in identifying the roles of grazer assemblage (Yahel et al ) and flow speed (Ribes and Atkinson ) on grazing rates, but estimates are mainly relevant for the specific experimental grazing community being examined (Ribes et al ). Methods such as Lagrangian sampling of waters following drogue tracks (Yahel et al ; Cuet et al ) or control volume (CoVo) approaches that utilize continuous velocity measurements and Eulerian sampling to estimate fluxes over a volume of interest (Genin et al ; Monismith et al ) have provided researchers with direct in situ estimates of grazing rates by reef communities; however, only a limited number of these studies have been conducted to date.…”

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confidence: 99%

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Benthic uptake of phytoplankton and ocean‐reef exchange of particulate nutrients on a tide‐dominated reef

Gruber

Lowe

Falter

2018

Limnology & Oceanography

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Benthic fluxes of chlorophyll a (Chl a) and particulate organic carbon (POC) and nitrogen (PON) were quantified on Tallon reef, a strongly tide-dominated (spring range > 8 m) reef located in the Kimberley region of northwestern Australia, over a 2-week period. Extensive hydrodynamic observations were used to construct a reef-scale mass balance to estimate material exchange between the reef and ocean over individual tidal cycles. Additionally, a one-dimensional control volume approach was used to estimate fluxes of Chl a in waters traversing the reef platform. Particulate material was delivered to the reef platform in a pulse during flood tide, and benthic uptake of Chl a declined to negligible values toward the end of ebb tide. On the scale of tidal cycles, a net uptake of Chl a was observed on the reef platform (on average 1.3 mg Chl a m 22 d 21), which was lower than previous studies of many reef communities. Fluxes showed variability depending on the magnitude of individual tidal cycles, which was likely related to volumes of oceanic Chl a inputs. Tallon reef was a net source of detrital POC and PON to the surrounding coastal ocean, with average POC

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Section: Reef-scale Mass Balancesupporting

confidence: 72%

mentioning

confidence: 99%

Benthic uptake of phytoplankton and ocean‐reef exchange of particulate nutrients on a tide‐dominated reef

Gruber

Lowe

Falter

2018

Limnology & Oceanography

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“…The sponge was placed in a 42 L aquarium and left to acclimate for 24 h. The aquarium was fitted with running seawater, pumped from 40 m depth, ensuring replacement of the aquarium volume at least 10 times per hour, 3-fold the estimated sponge pumping rate (Yahel et al, 2003). To verify the quality of the water supply (Alexander et al, 2015), chlorophyll concentration in the aquarium and the ambient seawater were measured using the non-acidification method (Yahel et al, 2005b). The concentration of chlorophyll in the aquarium was 0.41 µg L −1 , ∼80% of the intake value and well within the range of reported value for the coral reef of Eilat (Shaked and Genin, 2014).…”

Section: Running Seawater Aquariummentioning

confidence: 99%

Intermittent Hypoxia and Prolonged Suboxia Measured In situ in a Marine Sponge

et al. 2016

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High Microbial Abundance (HMA) sponges constitute a guild of suspension-feeding sponges that host vast populations of symbiotic microbes. These symbionts mediate a complex series of biogeochemical transformations that fuel the holobiont's metabolism. Although sponges are aerobic animals, suboxic and anaerobic bacteria are known to reside within their bodies. However, little is known about the chemical characteristics of the sponge environment in which they occur and almost no data are available regarding the dissolved oxygen (DO) dynamics inside the holobiont in its natural habitat. In this study we examined the oxygen dynamics in situ in the HMA sponge Theonella swinhoei. A submersed data-logging system equipped with micro-sensors was used to continuously record DO concentrations inside the sponge body and in its outflowing water for up to 48 h. Actively pumping sponges exhibited high DO removal rates punctuated with short bursts of extreme DO uptake (>90 µmol DO L −1 pumped ), never before observed in sponges. Such a high DO removal rate indicates the consumption of a considerable amount of reduced matter, far exceeding the available sources in the surrounding water of the oligotrophic coral-reef ecosystem inhabited by this sponge. The inner body of the sponge remained suboxic throughout the experiments, with short events of further rapid DO concentration decline. Moreover, DO concentrations measured in the body and in the outflowing water were found to be uncorrelated. Our findings support a previous hypothesis of bacterial symbiont farming by the sponge as a potential source for acquiring reduced material. Moreover, this suggests a complex and highly localized control of the holobiont's metabolism, probably associated with the microbial community's metabolism. Our results indicate that temporal micro-environments exist in the sponge at alternating locations, providing suitable conditions for the activity of its anaerobic microbial symbionts.

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“…Hard and soft corals feed on bacterioplankton. Coral rock with its suspension-and filter-feeding communities does the same, but also feeds on phytoplankton (Yahel et al 2006).…”

Section: Linear Inverse Food Web Model (Food Web Lim)mentioning

confidence: 99%

A carbon cycling model shows strong control of seasonality and importance of sponges on the functioning of a northern Red Sea coral reef

et al. 2023

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Coral reefs in the northern Red Sea experience strong seasonality. This affects reef carbon (C) cycling, but ecosystem-wide quantification of C fluxes in such reefs is limited. This study quantified seasonal reef community C fluxes with incubations. Resulting data were then incorporated into seasonal linear inverse models (LIM). For spring, additional sponge incubation results allowed for unique assessment of the contribution of sponges to C cycling. The coral reef ecosystem was heterotrophic throughout all seasons as gross community primary production (GPP; 136–200, range of seasonal means in mmol C m−2 d−1) was less than community respiration (R; 192–279), and balanced by import of organic carbon (52–100), 88‒92% of which being dissolved organic carbon (DOC). Hard coral GPP (74–110) and R (100–137), as well as pelagic bacteria DOC uptake (58–101) and R (42–86), were the largest C fluxes across seasons. The ecosystem was least heterotrophic in spring (highest irradiance) (GPP:R 0.81), but most heterotrophic in summer and fall with higher water temperatures (0.68 and 0.60, respectively). Adding the sponge community to the model increased community R (247 ± 8 without to 353 ± 13 with sponges (mean ± SD)). Sponges balanced this demand primarily with DOC uptake (105 ± 6, 97% by cryptic sponges). This rate is comparable to the uptake of DOC by pelagic bacteria (104 ± 5) placing the cryptic sponges among the dominant C cycling groups in the reef.

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Phytoplankton grazing by epi- and infauna inhabiting exposed rocks in coral reefs

Cited by 9 publications

References 36 publications

Benthic uptake of phytoplankton and ocean‐reef exchange of particulate nutrients on a tide‐dominated reef

Benthic uptake of phytoplankton and ocean‐reef exchange of particulate nutrients on a tide‐dominated reef

Intermittent Hypoxia and Prolonged Suboxia Measured In situ in a Marine Sponge

A carbon cycling model shows strong control of seasonality and importance of sponges on the functioning of a northern Red Sea coral reef

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