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Large predatory coral trout species unlikely to meet increasing energetic demands in a warming ocean.

Johansen JL, Pratchett MS, Messmer V, Coker DJ, Tobin AJ, Hoey AS - Sci Rep (2015)

Bottom Line: If productivity of marine systems and fisheries are to persist, individual species must compensate for this demand through increasing energy acquisition or decreasing energy expenditure.Here we reveal that the most important coral reef fishery species in the Indo-west Pacific, the large predatory coral trout Plectropomus leopardus (Serranidae), can behaviourally adjust food intake to maintain body-condition under elevated temperatures, and acclimate over time to consume larger meals.However, these increased energetic demands are unlikely to be met by adequate production at lower trophic levels, as smaller prey species are often the first to decline in response to climate-induced loss of live coral and structural complexity.

View Article: PubMed Central - PubMed

Affiliation: ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville QLD 4811, Australia.

ABSTRACT
Increased ocean temperature due to climate change is raising metabolic demands and energy requirements of marine ectotherms. If productivity of marine systems and fisheries are to persist, individual species must compensate for this demand through increasing energy acquisition or decreasing energy expenditure. Here we reveal that the most important coral reef fishery species in the Indo-west Pacific, the large predatory coral trout Plectropomus leopardus (Serranidae), can behaviourally adjust food intake to maintain body-condition under elevated temperatures, and acclimate over time to consume larger meals. However, these increased energetic demands are unlikely to be met by adequate production at lower trophic levels, as smaller prey species are often the first to decline in response to climate-induced loss of live coral and structural complexity. Consequently, ubiquitous increases in energy consumption due to climate change will increase top-down competition for a dwindling biomass of prey, potentially distorting entire food webs and associated fisheries.

No MeSH data available.


Related in: MedlinePlus

The effect of body size on (A) the feeding frequency, (B) meals size and (C) average overall food intake of common coral trout (Plectropomus leopardus) across four temperature treatments. Feeding frequency is in days, while meal size and overall food intake are in % body-weight (% bw). Error bars are standard errors of the mean. Significant differences within size groups and across temperatures are shown above each column. Column shadings (white to black) represent different temperatures. Notice how temperature affects all size-groups equally.
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f2: The effect of body size on (A) the feeding frequency, (B) meals size and (C) average overall food intake of common coral trout (Plectropomus leopardus) across four temperature treatments. Feeding frequency is in days, while meal size and overall food intake are in % body-weight (% bw). Error bars are standard errors of the mean. Significant differences within size groups and across temperatures are shown above each column. Column shadings (white to black) represent different temperatures. Notice how temperature affects all size-groups equally.

Mentions: Body size of fishes had a significant negative effect on meal size (F2,108 = 22.23, p < 0.001) and overall food intake (F2,108 = 7.98, p < 0.001, Fig. 2, Supplementary Table S1). Relative to body size, small (<1 kg) and medium (1–2 kg) individuals consumed more than large individuals (>2 kg), averaging 4.6 ± 0.2%bw/meal (equating to 1.6 ± 0.1%bw/day) in small individuals and 2.5 ± 0.3%bw/meal (0.9 ± 0.1%bw/day, mean ± SE) in large individuals. From 24 °C to 33 °C, small individuals increased food intake from 1.2 ± 0.1 to 2.1 ± 0.2%bw/day, while large individuals increased from 0.6 ± 0.2 to 1.4 ± 0.2%bw/day (mean ± SE, Fig. 2). This equated to an average increase in food intake of 1.19–1.34 times for every 3 °C temperature rise. There was no significant interaction between body size and temperature (F6,108 = 0.99, p = 0.436, Fig. 2), showing that the responses of fishes to increasing temperature were consistent across all size classes.


Large predatory coral trout species unlikely to meet increasing energetic demands in a warming ocean.

Johansen JL, Pratchett MS, Messmer V, Coker DJ, Tobin AJ, Hoey AS - Sci Rep (2015)

The effect of body size on (A) the feeding frequency, (B) meals size and (C) average overall food intake of common coral trout (Plectropomus leopardus) across four temperature treatments. Feeding frequency is in days, while meal size and overall food intake are in % body-weight (% bw). Error bars are standard errors of the mean. Significant differences within size groups and across temperatures are shown above each column. Column shadings (white to black) represent different temperatures. Notice how temperature affects all size-groups equally.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4561880&req=5

f2: The effect of body size on (A) the feeding frequency, (B) meals size and (C) average overall food intake of common coral trout (Plectropomus leopardus) across four temperature treatments. Feeding frequency is in days, while meal size and overall food intake are in % body-weight (% bw). Error bars are standard errors of the mean. Significant differences within size groups and across temperatures are shown above each column. Column shadings (white to black) represent different temperatures. Notice how temperature affects all size-groups equally.
Mentions: Body size of fishes had a significant negative effect on meal size (F2,108 = 22.23, p < 0.001) and overall food intake (F2,108 = 7.98, p < 0.001, Fig. 2, Supplementary Table S1). Relative to body size, small (<1 kg) and medium (1–2 kg) individuals consumed more than large individuals (>2 kg), averaging 4.6 ± 0.2%bw/meal (equating to 1.6 ± 0.1%bw/day) in small individuals and 2.5 ± 0.3%bw/meal (0.9 ± 0.1%bw/day, mean ± SE) in large individuals. From 24 °C to 33 °C, small individuals increased food intake from 1.2 ± 0.1 to 2.1 ± 0.2%bw/day, while large individuals increased from 0.6 ± 0.2 to 1.4 ± 0.2%bw/day (mean ± SE, Fig. 2). This equated to an average increase in food intake of 1.19–1.34 times for every 3 °C temperature rise. There was no significant interaction between body size and temperature (F6,108 = 0.99, p = 0.436, Fig. 2), showing that the responses of fishes to increasing temperature were consistent across all size classes.

Bottom Line: If productivity of marine systems and fisheries are to persist, individual species must compensate for this demand through increasing energy acquisition or decreasing energy expenditure.Here we reveal that the most important coral reef fishery species in the Indo-west Pacific, the large predatory coral trout Plectropomus leopardus (Serranidae), can behaviourally adjust food intake to maintain body-condition under elevated temperatures, and acclimate over time to consume larger meals.However, these increased energetic demands are unlikely to be met by adequate production at lower trophic levels, as smaller prey species are often the first to decline in response to climate-induced loss of live coral and structural complexity.

View Article: PubMed Central - PubMed

Affiliation: ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville QLD 4811, Australia.

ABSTRACT
Increased ocean temperature due to climate change is raising metabolic demands and energy requirements of marine ectotherms. If productivity of marine systems and fisheries are to persist, individual species must compensate for this demand through increasing energy acquisition or decreasing energy expenditure. Here we reveal that the most important coral reef fishery species in the Indo-west Pacific, the large predatory coral trout Plectropomus leopardus (Serranidae), can behaviourally adjust food intake to maintain body-condition under elevated temperatures, and acclimate over time to consume larger meals. However, these increased energetic demands are unlikely to be met by adequate production at lower trophic levels, as smaller prey species are often the first to decline in response to climate-induced loss of live coral and structural complexity. Consequently, ubiquitous increases in energy consumption due to climate change will increase top-down competition for a dwindling biomass of prey, potentially distorting entire food webs and associated fisheries.

No MeSH data available.


Related in: MedlinePlus