The effect of flow speed and food size on the capture efficiency and feeding behaviour of the cold-water coral Lophelia pertusa

Orejas, Covadonga; Gori, Andrea; Rad‐Menéndez, Cecilia; Davies, Andrew J.; Beveridge, Christine; Sadd, Daniel; Kiriakoulakis, Kostas; Witte, Ursula; Roberts, J. Murray

doi:10.1016/j.jembe.2016.04.002

Cited by 77 publications

(94 citation statements)

References 42 publications

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“…In Tsounis et al (2010) initial food densities were far higher with 10-20 Artemia nauplii mL −1 compared to 0.345-1.035 nauplii mL −1 in the study by Purser et al (2010) and 0.1 copepods mL −1 in the study by Orejas et al (2016). Compared to these studies, our food concentration in the experimental tanks was well in the range of the study by Purser et al (2010) with ∼0.3 Artemia nauplii mL −1 in the low food treatments and ∼3 nauplii mL −1 in the high food aquaria.…”

Section: Growth Ratesmentioning

confidence: 61%

“…A recently published feeding study by Orejas et al (2016) using different food types confirmed that lower flow velocities enhance food capturing by L. pertusa. In their experiment, copepods were used as zooplankton food source and were captured best at the lowest tested flow velocity of 2 cm s −1 , while phytoplankton was consumed preferentially at 5 cm s −1 (Orejas et al, 2016). At 10 cm s −1 the least food particles were captured.…”

Section: Growth Ratesmentioning

confidence: 78%

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Interactive Effects of Ocean Acidification and Warming on Growth, Fitness and Survival of the Cold-Water Coral Lophelia pertusa under Different Food Availabilities

2017

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Cold-water corals are important bioengineers that provide structural habitat for a diverse species community. About 70% of the presently known scleractinian cold-water corals are expected to be exposed to corrosive waters by the end of this century due to ocean acidification. At the same time, the corals will experience a steady warming of their environment. Studies on the sensitivity of cold-water corals to climate change mainly concentrated on single stressors in short-term incubation approaches, thus not accounting for possible long-term acclimatisation and the interactive effects of multiple stressors. Besides, preceding studies did not test for possible compensatory effects of a change in food availability. In this study a multifactorial long-term experiment (6 months) was conducted with end-of-the-century scenarios of elevated pCO 2 and temperature levels in order to examine the acclimatisation potential of the cosmopolitan cold-water coral Lophelia pertusa to future climate change related threats. For the first time multiple ocean change impacts including the role of the nutritional status were tested on L. pertusa with regard to growth, "fitness," and survival. Our results show that while L. pertusa is capable of calcifying under elevated CO 2 and temperature, its condition (fitness) is more strongly influenced by food availability rather than changes in seawater chemistry. Whereas growth rates increased at elevated temperature (+4 • C), they decreased under elevated CO 2 concentrations (∼800 µatm). No difference in net growth was detected when corals were exposed to the combination of increased CO 2 and temperature compared to ambient conditions. A 10-fold higher food supply stimulated growth under elevated temperature, which was not observed in the combined treatment. This indicates that increased food supply does not compensate for adverse effects of ocean acidification and underlines the importance of considering the nutritional status in studies investigating organism responses under environmental changes.

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Section: Growth Ratesmentioning

confidence: 61%

Section: Growth Ratesmentioning

confidence: 78%

Interactive Effects of Ocean Acidification and Warming on Growth, Fitness and Survival of the Cold-Water Coral Lophelia pertusa under Different Food Availabilities

2017

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“…Laboratory studies have confirmed the uptake of suspended particles, bacteria, phytoplankton and zooplankton by cold-water corals (Purser et al, 2010; Published by Copernicus Publications on behalf of the European Geosciences Union. 5790 D. van Oevelen et al: Food selectivity and processing by the cold-water coral Lophelia pertusa Mueller et al, 2014;Orejas et al, 2016). Recently, L. pertusa was also shown to take up dissolved organic matter in the form of free amino acids (Gori et al, 2014;Mueller et al, 2014) and to fix inorganic carbon into its biomass, supposedly through chemo-autotrophic activity of associated microbes (Middelburg et al, 2015).…”

Section: Introductionmentioning

confidence: 90%

“…Field observations on stable isotopes and fatty acids suggest that L. pertusa feeds on a broad range of food sources including particulate suspended matter, bacteria, phytoplankton and zooplankton (Kiriakoulakis et al, 2005;Duineveld et al, 2007;Sherwood et al, 2008;Dodds et al, 2009). Laboratory studies have confirmed the uptake of suspended particles, bacteria, phytoplankton and zooplankton by cold-water corals (Purser et al, 2010; Published by Copernicus Publications on behalf of the European Geosciences Union. 5790 D. van Oevelen et al: Food selectivity and processing by the cold-water coral Lophelia pertusa Mueller et al, 2014;Orejas et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, L. pertusa was also shown to take up dissolved organic matter in the form of free amino acids (Gori et al, 2014;Mueller et al, 2014) and to fix inorganic carbon into its biomass, supposedly through chemo-autotrophic activity of associated microbes (Middelburg et al, 2015). This flexibility in resource utilization clearly indicates an opportunistic feeding strategy (Mueller et al, 2014;Orejas et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Food selectivity and processing by the cold-water coral <i>Lophelia pertusa</i>

et al. 2016

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Abstract. Cold-water corals form prominent reef ecosystems along ocean margins that depend on suspended resources produced in surface waters. In this study, we investigated food processing of 13 C and 15 N labelled bacteria and algae by the cold-water coral Lophelia pertusa. Coral respiration, tissue incorporation of C and N and metabolically derived C incorporation into the skeleton were traced following the additions of different food concentrations (100, 300, 1300 µg C L −1 ) and two ratios of suspended bacterial and algal biomass (1 : 1, 3 : 1). Respiration and tissue incorporation by L. pertusa increased markedly following exposure to higher food concentrations. The net growth efficiency of L. pertusa was low (0.08 ± 0.03), which is consistent with its slow growth rate. The contribution of algae and bacteria to total coral assimilation was proportional to the food mixture in the two lowest food concentrations, but algae were preferred over bacteria as a food source at the highest food concentration. Similarly, the stoichiometric uptake of C and N was coupled in the low and medium food treatment, but was uncoupled in the high food treatment and indicated a comparatively higher uptake or retention of bacterial carbon as compared to algal nitrogen. We argue that behavioural responses for these small-sized food particles, such as tentacle behaviour, mucus trapping and physiological processing, are more likely to explain the observed food selectivity as compared to physical-mechanical considerations. A comparison of the experimental food conditions to natural organic carbon concentrations above CWC reefs suggests that L. pertusa is well adapted to exploit temporal pulses of high organic matter concentrations in the bottom water caused by internal waves and downwelling events.

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Physiology of the widespread pulsating soft coralXenia umbellatais affected by food sources, but not by water flow

Hill,

Abbass,

Caporale

et al. 2023

Ecology and Evolution

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Coral energy and nutrient acquisition strategies are complex and sensitive to environmental conditions such as water flow. While high water flow can enhance feeding in hard corals, knowledge about the effects of water flow on the feeding of soft corals, particularly those pulsating, is still limited. In this study, we thus investigated the effects of feeding and water flow on the physiology of the pulsating soft coral Xenia umbellata. We crossed three feeding treatments: (i) no feeding, (ii) particulate organic matter (POM) in the form of phytoplankton and (iii) dissolved organic carbon (DOC) in the form of glucose, with four water volume exchange rates (200, 350, 500 and 650 L h−1) over 15 days. Various ecophysiological parameters were assessed including pulsation rate, growth rate, isotopic and elemental ratios of carbon (C) and nitrogen (N) as well as photo‐physiological parameters of the Symbiodiniaceae (cell density, chlorophyll‐a and mitotic index). Water flow had no significant effect but feeding had a substantial impact on the physiology of the X. umbellata holobiont. In the absence of food, corals exhibited significantly lower pulsation rates, lower Symbiodiniaceae cell density and lower mitotic indices compared to the fed treatments, yet significantly higher chlorophyll‐a per cell and total N content. Differences were also observed between the two feeding treatments, with significantly higher pulsation rates and lower chlorophyll‐a per cell in the DOC treatment, but higher C and N content in the POM treatment. Our findings suggest that the X. umbellata holobiont can be viable under different trophic strategies, though favouring mixotrophy. Additionally, the physiology of the X. umbellata may be regulated through its own pulsating behaviour without any positive or negative effects from different water flow. Therefore, this study contributes to our understanding of soft coral ecology, particularly regarding the competitive success and widespread distribution of X. umbellata.

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The effect of flow speed and food size on the capture efficiency and feeding behaviour of the cold-water coral Lophelia pertusa

Cited by 77 publications

References 42 publications

Interactive Effects of Ocean Acidification and Warming on Growth, Fitness and Survival of the Cold-Water Coral Lophelia pertusa under Different Food Availabilities

Interactive Effects of Ocean Acidification and Warming on Growth, Fitness and Survival of the Cold-Water Coral Lophelia pertusa under Different Food Availabilities

Food selectivity and processing by the cold-water coral <i>Lophelia pertusa</i>

Physiology of the widespread pulsating soft coralXenia umbellatais affected by food sources, but not by water flow

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The effect of flow speed and food size on the capture efficiency and feeding behaviour of the cold-water coral Lophelia pertusa

Cited by 77 publications

References 42 publications

Interactive Effects of Ocean Acidification and Warming on Growth, Fitness and Survival of the Cold-Water Coral Lophelia pertusa under Different Food Availabilities

Interactive Effects of Ocean Acidification and Warming on Growth, Fitness and Survival of the Cold-Water Coral Lophelia pertusa under Different Food Availabilities

Food selectivity and processing by the cold-water coral &lt;i&gt;Lophelia pertusa&lt;/i&gt;

Physiology of the widespread pulsating soft coralXenia umbellatais affected by food sources, but not by water flow

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Product

Resources

About

Food selectivity and processing by the cold-water coral <i>Lophelia pertusa</i>