Effects of Different Potential Food Sources on Upper-Bathyal Benthic Foraminifera: An Experiment With Propagules

Duffield, Christopher James; Edvardsen, Bente; Eikrem, Wenche; Alve, Elisabeth

doi:10.2113/gsjfr.44.4.416

Cited by 16 publications

(13 citation statements)

References 72 publications

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“…A propagule experiment by Duffield et al . () showed that the addition of different types of food influenced the resulting foraminiferal assemblage, providing certain species with a better ability to compete with those species that were able to sustain themselves from algae that were present in the sediment or grew during the experiment.…”

Section: Discussionmentioning

confidence: 99%

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Changing structure of benthic foraminiferal communities: implications from experimentally grown assemblages from coastal Georgia and Florida, USA

Weinmann

Goldstein

2016

Marine Ecology

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Environmental changes such as ocean warming or sea-level rise have a profound impact on shallow-water coastal environments. Benthic foraminifera have long been successfully used as indicators for ecologic responses. The propagule method is a useful tool to evaluate the reactions of entire assemblages of foraminifera when exposed to different environmental conditions. Here we present results from growth experiments of foraminiferal assemblages from three sites in coastal Georgia and Florida (USA) under different temperatures (18, 24 and 30°C) and salinities (15 and 35). Results show that assemblages grown at the higher temperatures had greater abundances of foraminifera, whereas salinity was the primary factor in shaping the composition of the experimentally grown assemblages from the three sites. We also show that experimentally grown assemblages contain high numbers of 'exotic' species that result from successful propagule recruitment from outside of the original environments (e.g. the open shelf). Overall, opportunistic and previously termed 'pioneer species' proved to be the most successful constituents of the experimental assemblages, showing that reactions of foraminiferal assemblages to environmental changes can appear remarkably quickly (e.g. in the course of several weeks). Our observations on the faunal reactions to different temperatures and salinities indicate that ongoing environmental alterations of coastal areas will likely result in significant changes in the shallow-water foraminiferal assemblages of the coasts of Georgia and Florida. As such, our study provides general insights into the ecologic effects of current climate change.

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Section: Discussionmentioning

confidence: 99%

“…Additional food was used in a study by Duffield et al . () but they also found that most foraminifera do grow in the absence of additional food. The algae grown within the sediment during the course of the present experiment provided nutrition for those species that rely on external food sources.…”

Section: Methodsmentioning

confidence: 98%

Changing structure of benthic foraminiferal communities: implications from experimentally grown assemblages from coastal Georgia and Florida, USA

Weinmann

Goldstein

2016

Marine Ecology

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“…Bathysiphon species are well-known for occupying deposit-feeding niches (Landing et al, 2012). Because they mainly feed on detritus and bacteria (Duffield et al, 2014) this may give them the ability to thrive in low organic content conditions such as those observed near the WHs. Bathysiphon tests are made of agglutinated material (micaceous scales or quartz grains) instead of calcium carbonate (Cole and Valentine, 2006;Sen Gupta, 2002).…”

Section: Foraminiferal Indicators Of Environmental Impactmentioning

confidence: 99%

First evaluation of foraminiferal metabarcoding for monitoring environmental impact from an offshore oil drilling site

Laroche

Wood

Tremblay

et al. 2016

Marine Environmental Research

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At present, environmental impacts from offshore oil and gas activities are partly determined by measuring changes in macrofauna diversity. Morphological identification of macrofauna is time-consuming, expensive and dependent on taxonomic expertise. In this study, we evaluated the applicability of using foraminiferal-specific metabarcoding for routine monitoring. Sediment samples were collected along distance gradients from two oil platforms off Taranaki (New Zealand) and their physico-chemical properties, foraminiferal environmental DNA/RNA, and macrofaunal composition analyzed. Macrofaunal and foraminiferal assemblages showed similar shifts along impact gradients, but responded differently to environmental perturbations. Macrofauna were affected by hypoxia, whereas sediment grain size appeared to drive shifts in foraminifera. We identified eight foraminiferal molecular operational taxonomic units that have potential to be used as bioindicator taxa. Our results show that metabarcoding represents an effective tool for assessing foraminiferal communities near offshore oil and gas platforms, and that it can be used to complement current monitoring techniques.

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“…The field and laboratory studies showed that deep-sea foraminifera are adapted to limited or no supply of food material for long periods, meaning starvation (Linke 1992, Graf & Linke 1992. The abundance of specimens not fed with additional food also increased, suggesting that most species were feeding on microbes or detritus available in the sediment (Duffield et al 2014). The seawater provided to the specimens in the present study contained microbes.…”

Section: Discussionmentioning

confidence: 50%

“…But such a possibility is ruled out in the present experiment as all the specimens were fed the same type of food. Additionally, the chance of any adverse impact of a single diatom diet on C. plana is also unlikely, as the monospecific diatom cultures grown in the laboratory were the most favourable food for foraminifera (Duffield et al 2014). The response of C. plana to food is similar to another benthic foraminifer Marginopora kudakajimensis.…”

Section: Discussionmentioning

confidence: 99%

How will Benthic Foraminifera Respond to Warming and Changes in Productivity?: A Laboratory Culture Study on Cymbaloporetta plana

Kurtarkar

Saraswat

Kaithwar

et al. 2019

Acta Geologica Sinica (Eng)

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Anthropogenic activities are likely to cause global warming. Global warming will affect marine productivity and thus food availability for marine organisms. Both the seawater temperature and food availability affect benthic foraminifera, the most abundant marine calcareous microorganisms. Therefore, a laboratory culture experiment was conducted on Cymbaloporetta plana to understand the coupled effect of temperature (25°C, 27°C, 30°C) and food (102±5, 203±9, 305±14, 407±18, 508±23 diatom cells). At all temperatures, growth increased with increase in food. The specimens subjected to 27°C temperature attained the maximum growth and those subjected to 25°C were the smallest. All specimens fed with 508±23 cells reproduced, 0irrespective of temperature. Of all the specimens without food, 40% at 27°C and 20% at 25°C reproduced, whereas specimens subjected to 30°C did not reproduce. The 100% rate of reproduction at 27°C suggests that it is the optimum temperature for growth and reproduction. All the specimens at 30°C and without additional food, died, whereas at 25°C and 27°C, the mortality rate was 80% and 60%, respectively. The limited growth and reproduction with decreasing food clearly indicates that food availability also controls the growth and reproduction of shallow water benthic foraminifer C. plana. Therefore, warming coupled with decreasing productivity is likely to severely affect the growth and abundance of shallow water benthic foraminifera.

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Effects of Different Potential Food Sources on Upper-Bathyal Benthic Foraminifera: An Experiment With Propagules

Cited by 16 publications

References 72 publications

Changing structure of benthic foraminiferal communities: implications from experimentally grown assemblages from coastal Georgia and Florida, USA

Changing structure of benthic foraminiferal communities: implications from experimentally grown assemblages from coastal Georgia and Florida, USA

First evaluation of foraminiferal metabarcoding for monitoring environmental impact from an offshore oil drilling site

How will Benthic Foraminifera Respond to Warming and Changes in Productivity?: A Laboratory Culture Study on Cymbaloporetta plana

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