Antagonistic interplay between pH and food resources affects copepod traits and performance in a year-round upwelling system

Linking pH/ p CO 2 natural variation to phenotypic traits and performance of foundational species provides essential information for assessing and predicting the impact of ocean acidification (OA) on marine ecosystems. Yet, evidence of such linkage for copepods, the most abundant metazoans in the oc...

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Published in:Scientific reports 2020-01, Vol.10 (1), p.62-62, Article 62
Main Authors: Aguilera, Victor M., Vargas, Cristian A., Dam, Hans G.
Format: Article
Language:English
Subjects:
119/118
14/63
704/158/2455
704/47/4113
704/829/827
Acidification
Animals
Body Size
Carbon Dioxide - chemistry
Chlorophyll
Chlorophyll - chemistry
Chlorophyll - metabolism
Copepoda - growth & development
Copepoda - metabolism
Ecosystem
Egg production
Female
Humanities and Social Sciences
Hydrogen-Ion Concentration
Marine ecosystems
multidisciplinary
Oceans
Ovum - physiology
pH effects
Phenotypic variations
Resource availability
Science
Science (multidisciplinary)
Seasons
Seawater - chemistry
Temperature
Upwelling
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description Linking pH/ p CO 2 natural variation to phenotypic traits and performance of foundational species provides essential information for assessing and predicting the impact of ocean acidification (OA) on marine ecosystems. Yet, evidence of such linkage for copepods, the most abundant metazoans in the oceans, remains scarce, particularly for naturally corrosive Eastern Boundary Upwelling systems (EBUs). This study assessed the relationship between pH levels and traits (body and egg size) and performance (ingestion rate (IR) and egg reproduction rate (EPR)) of the numerically dominant neritic copepod Acartia tonsa , in a year-round upwelling system of the northern (23° S) Humboldt EBUs. The study revealed decreases in chlorophyll (Chl) ingestion rate, egg production rate and egg size with decreasing pH as well as egg production efficiency, but the opposite for copepod body size. Further, ingestion rate increased hyperbolically with Chl, and saturated at ~1 µg Chl. L −1 . Food resources categorized as high (H, >1 µg L −1 ) and low (L,  7.89) and future (>400 µatm p CO 2, pH 
doi_str_mv 10.1038/s41598-019-56621-6
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Food resources categorized as high (H, &gt;1 µg L −1 ) and low (L, &lt;1 µg L −1 ) levels, and pH-values categorized as equivalent to present day (≤400 µatm p CO 2 , pH &gt; 7.89) and future (&gt;400 µatm p CO 2, pH &lt; 7.89) were used to compare our observations to values globally employed to experimentally test copepod sensitivity to OA. A comparison (PERMANOVA) test with Chl/pH (2*2) design showed that partially overlapping OA levels expected for the year 2100 in other ocean regions, low-pH conditions in this system negatively impacted traits and performance associated with copepod fitness. However, interacting antagonistically with pH, food resource (Chl) maintained copepod production in spite of low pH levels. 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subjects 119/118
14/63
704/158/2455
704/47/4113
704/829/827
Acidification
Animals
Body Size
Carbon Dioxide - chemistry
Chlorophyll
Chlorophyll - chemistry
Chlorophyll - metabolism
Copepoda - growth & development
Copepoda - metabolism
Ecosystem
Egg production
Female
Humanities and Social Sciences
Hydrogen-Ion Concentration
Marine ecosystems
multidisciplinary
Oceans
Ovum - physiology
pH effects
Phenotypic variations
Resource availability
Science
Science (multidisciplinary)
Seasons
Seawater - chemistry
Temperature
Upwelling
title Antagonistic interplay between pH and food resources affects copepod traits and performance in a year-round upwelling system
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