Andrade Diaz, Claudia Daniela Yanett

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Andrade Diaz, Claudia Daniela Yanett

Afiliación principal

Instituto de la Patagonia

claudia.andrade@umag.cl

ORCID

0000-0003-0804-6348

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Línea de investigación

Ciencia Antartica y Subantartica

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Mostrando 1 - 6 de 6

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DOI 10.3390/biology11121723
Feeding Ecology of Odontaster validus under Different Environmental Conditions in the West Antarctic Peninsula
2022-12
Zenteno-Devaud, Lisette
;
Aguirre-Martinez, Gabriela
;
Andrade Diaz, Claudia Daniela Yanett
;
Cardenas, Leyla
;
Miguel Pardo, Luis
;
Gonzalez, Humberto E.
;
Garrido, Ignacio
Simple Summary Even though researchers have previously examined the diet of O. validus, the feeding ecology of this species of sea star is still poorly understood. To address this issue, we used a multifaceted approach to investigate the diet of O. validus from three systems with marked environmental differences of the northern Antarctic Peninsula. The results showed a significant divergence of O. validus delta N-15-delta C-13 values among regions, suggesting a habitat-specific foraging behavior and confirming the ability of this species to switch resource utilization across differing habitat compositions, which may be a key survival response in the face of environmental change. 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 delta N-15 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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DOI 10.3390/biology11121723
Feeding Ecology of Odontaster validus under Different Environmental Conditions in the West Antarctic Peninsula
2022-12
Zenteno-Devaud, Lisette
;
Aguirre-Martinez, Gabriela
;
Andrade Diaz, Claudia Daniela Yanett
;
Cardenas, Leyla
;
Miguel Pardo, Luis
;
Gonzalez, Humberto E.
;
Garrido, Ignacio
Simple Summary Even though researchers have previously examined the diet of O. validus, the feeding ecology of this species of sea star is still poorly understood. To address this issue, we used a multifaceted approach to investigate the diet of O. validus from three systems with marked environmental differences of the northern Antarctic Peninsula. The results showed a significant divergence of O. validus delta N-15-delta C-13 values among regions, suggesting a habitat-specific foraging behavior and confirming the ability of this species to switch resource utilization across differing habitat compositions, which may be a key survival response in the face of environmental change. 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 delta N-15 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.
Scopus© Citations 9 1
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DOI 10.3390/d13110556
Trophic Ecology of Juvenile Southern King Crab Associated with Kelp Forest: Evidence of Cannibalism
2021-11
Pardo, Luis Miguel
;
Andrade Diaz, Claudia Daniela Yanett
;
Zenteno-Devaud, Lisette
;
Garrido, Bastian
;
Rivera, Cristobal
The southern king crab, Lithodes santolla, is a well-known predator/scavenger species during its adult phase but its feeding strategy in early stages is less studied. This information is important to understand their role in ecosystems and to improve fishery management (i.e., stock enhancement). Based on stomach contents and stable isotope analysis, we determined variation in the composition of diet and niche overlap in vagile and cryptic phase collected within and outside a kelp forest, Macrocystis pyrifera, of Aguila Bay at the Magellan Strait in Patagonia, Chile. Results of juvenile stomach content analysis showed 60% dissimilarity between cryptic and vagile juvenile phases. Algae dominated the volumetric contribution in cryptic juveniles while crustacean dominated the diet in vagile phase. Exoskeleton of other king crabs occurred in 43% of juveniles with crustaceans in their stomach. This fact confirms cannibalistic behavior in the wild in this species, which is consistent with findings in massive laboratory cultures. There was no evidence of isotopic niche shift between cryptic and vagile juvenile phases. Overlapping isotopic niches of different-sized juveniles suggest that they exploit similar food resources. However, vagile individuals occupy a higher trophic position than cryptic individuals, which could suggest a switch in dietary preference, from detritivorous/herbivory within kelp forests to omnivory outside of kelp forests, and an increase in the level of cannibalism in vagile juveniles.
Scopus© Citations 8
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DOI 10.3390/d14010056
Trophic Niche Dynamics and Diet Partitioning of King Crab Lithodes santolla in Chile's Sub-Antarctic Water
2022-1
Andrade Diaz, Claudia Daniela Yanett
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Rivera, Cristobal
;
Daza, Erik
;
Almonacid, Eduardo
;
Ovando, Fernanda
;
Morello Repetto, Flavia
;
Pardo, Luis Miguel
The southern king crab Lithodes santolla is one of the most economically important fishery species in the southern waters of the Atlantic and Pacific Oceans. A combination of stomach content and stable isotope analyses was used to reveal the potential dietary characteristics, isotopic niche, overlap among maturity stages and sexes, and trophic relationships of an L. santolla population in the Nassau Bay, Cape Horn region. Stable isotope analyses indicated that L. santolla assimilated energy from a basal carbon source, the giant kelp Macrocystis pyrifera, forming the trophic baseline of the benthic food web. Moreover, the trophic position of L. santolla varied among late juveniles and adults, suggesting that the southern king crab does undergo an ontogenetic diet shift. L. santolla exhibited intraspecific isotopic niche variation, reflecting niche differentiation which allows the species to partition resources. The trophic relationships of L. santolla with the associated fauna suggested some potential interactions for food resources/habitat use when they are limited. This study is the first attempt to characterize the trophic dynamics of the southern king crab in the Cape Horn area and, by generating more data, contributes to the conservation of the king crab population and the long-term management of local fisheries that rely on this resource.
Scopus© Citations 13
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DOI 10.1016/j.ecss.2019.106536
Benthic trophic structure of a Patagonian fjord (47°S): The role of hydrographic conditions in the food supply in a glaciofluvial system
2020-2-5
Cari, Ilia
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Andrade Diaz, Claudia Daniela Yanett
;
Quiroga, Eduardo
;
Mutschke Orellana, Erika E.
Food web studies have provided insight into the dynamics of benthic ecosystems and their stability, stimulating research into the importance of different organic matters (OM) inputs in the ecological and metabolic processes that affect community structure. Using stable isotope analysis (SIA) and Bayesian ellipses, this study examines the influence of terrestrial OM and hydrographic conditions on food web structure and niche width in a glacial system (Baker/Martinez fjord complex). Two ecological groups were identified; one located in the inner and middle fjord and the other one in the outer fjord. Both had isotopically less diverse feeding groups in comparison to non-glacier benthic communities, comprising four trophic levels. In addition, the study area exhibited high trophic redundancy (e.g., species with overlapping trophic niches) associated with chronic natural physical disturbances from glacial sedimentations, which have shaped this non-selective feeding benthic community. The trophic structure metrics suggest that the benthic food web is supported principally by primary production and terrestrial OM pathways, but macroalgal subsidies could be important to detritivores via floating kelp in the inner area of the fjord. The results of this study suggest that glaciofluvial benthic communities have higher trophic redundancy associated with environmental disturbance conducted by sediment load, shaping a benthic community with a lower alpha diversity and fewer trophic levels in comparison to no-glacier environments.
Scopus© Citations 17 2
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DOI 10.1002/aqc.3469
A country's response to tackling plastic pollution in aquatic ecosystems: The Chilean way
2021-2
Urbina, M. A.
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Luna-Jorquera, G.
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Thiel, M.
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Acuna-Ruz, T.
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Amenabar Cristi, M. A.
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Andrade Diaz, Claudia Daniela Yanett
;
Ahrendt, C.
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Castillo, C.
;
Chevallier, A.
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Cornejo-D'Ottone, M.
Marine plastic pollution is worse than expected, and we are starting to realize its full extent and severity. Solving the plastic pollution problem is not easy, as it requires the action and commitment of all sectors of our society. With a coastline extending over 4,000 km (from 18 degrees S to 56 degrees S), Chile is a maritime country, and since plastics are potentially harmful for marine and coastal ecosystems, food security, and public health, plastic pollution is a real threat. Chile is the sixth-largest exporter of seafood (fish, invertebrates, and algae) in the world, but the extent of plastic contamination of marine organisms, its potential effects on commercial species and aquaculture, and its subsequent effects on human health are mostly unknown. Chile has recently introduced some legislation to prevent plastics from reaching the environment and the coastal ocean. Governmental and non-governmental organizations have joined an informal alliance to take action against plastic pollution, both at a national and regional level, but stronger involvement of producers and commerce is required for effective measures. Chilean scientists working on plastic pollution have created the Scientific Plastic Pollution Alliance of Chile network, aiming to promote collaborative and coordinated research focused on this pollutant. The wide geographical extent of Chile, with researchers working in diverse ecosystems, provides a unique opportunity to better understand the consequences of one of the most recent and severe threats to biodiversity. Rather than solely presenting the plastic pollution problem from the scientific perspective, this paper includes views from different sectors of society. Mitigating plastic pollution is exceptionally complex, with this study highlighting the importance of local engagement, media, solving social inequities, new legislation, and law enforcement in order to advance on decreasing plastic pollution from a country-wide perspective.
Scopus© Citations 23 2

Andrade Diaz, Claudia Daniela Yanett

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