Zenteno-Devaud L et al. (2022), Feeding Ecology of Odontaster validus under Dif...

ECB-ART-51101

Biology (Basel) 2022 Nov 28;1112:. doi: 10.3390/biology11121723.

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Feeding Ecology of Odontaster validus under Different Environmental Conditions in the West Antarctic Peninsula.

Zenteno-Devaud L , Aguirre-Martinez GV , Andrade C , Cárdenas L , Pardo LM , González HE , Garrido I .

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To study how Odontaster validus can influence the spatial structure of Antarctic benthic communities and how they respond to disturbance, it is necessary to assess potential dietary shifts in different habitats. We investigated the diets of O. validus from Maxwell Bay and South Bay in the West Antarctic Peninsula. A multifaceted approach was applied including in situ observations of cardiac stomach everted contents, isotopic niche, and trophic diversity metrics. Results confirm the flexible foraging strategy of this species under markedly different environmental conditions, suggesting plasticity in resource use. The data also showed evidence of isotopic niche expansion, high δ15N values, and Nacella concinna as a common food item for individuals inhabiting a site with low seasonal sea ice (Ardley Cove), which could have significant ecological implications such as new trophic linkages within the Antarctic benthic community. These results highlight the importance of considering trophic changes of key species to their environment as multiple ecological factors can vary as a function of climatic conditions.

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	Figure 1. Site locations where O. validus, prey, and the suspended particulate organic matter were sampled for stable isotopes analyses. Red circles indicate the three sites of study in the Western Antarctic Peninsula. Sea star denote sample sites of O. validus, triangles denote prey sites, and blue circles shows the suspended POM sites. Upper panels display sampling stations in Maxwell Bay (A,B) and South Bay (C). Lower panel display sampling station in Ardley Cove (A) and Marian Cove (B).
	Figure 2. Box-whisker plots showing variation in O. validus–δ13C (A) and δ15N (B) values among regions.
	Figure 3. In the left panel, (A) solid lines enclose the standard ellipse areas corrected for the sample size (SEAc) of O. validus populations from Ardley Cove, Marian Cove and South Bay. The right panel (B) shows the standard ellipse area Bayesian estimations (SEAB) for each population. Black dots show the SEAB mode, red dots represent the SEAC, and gray boxes the probability of data distribution (50% dark grey boxes, 75% light grey boxes and 95% lighter grey boxes).
	Figure 4. Density plot showing the 95, 75, and 50% credible intervals of Layman’s metrics in Marian Cove, South Bay and Ardley Cove using Bayesian techniques. Black dots represent the mean standard for each metrics; red dots indicate the mean of corrected metrics.
	Figure 5. Correlation coefficients between disk radius and δ13C and δ15N of O. validus from Marian Cove (A,B), South Bay (C,D), and Ardley Cove (E,F).
	Figure 6. Frequency of occurrence of O. validus cardiac stomach everted contents from Ardley Cove.
	Figure 7. The top panel (A–C) presents the dietary composition of O. validus across regions according to simmr model. Boxplots represent 95% credible interval of primary food sources assimilation for each consumer. The centerline in the box is the median of all solutions, and the box is drawn around the 25% and 75% quartiles, thereby representing 50% of the solutions. The δ13C and δ15N values of consumers were corrected for the discrimination factor so that they could be compared to the prey values. In the bottom panel, bivariate stable isotope ratios of O. validus and their potential prey items from Marian Cove (D), South Bay (E), and Ardley Cove (F) are shown without the correction of the discrimination factor.

References [+] :

Agüera, Parameter Estimations of Dynamic Energy Budget (DEB) Model over the Life History of a Key Antarctic Species: The Antarctic Sea Star Odontaster validus Koehler, 1906. 2015, Pubmed, Echinobase