The importance of macroalgae and associated amphipods in the selective benthic feeding of sister rockcod species Notothenia rossii and N. coriiceps (Nototheniidae) in West Antarctica

Barrera-Oro, Esteban; Moreira, Eugenia; Seefeldt, Meike Anna; Francione, Mariano Valli; Quartino, María Liliana

doi:10.1007/s00300-018-2424-0

Cited by 32 publications

(41 citation statements)

References 47 publications

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“…Interestingly, there were differences in responsiveness between the two species, with more genes responding and at a higher level in N. coriiceps. The reason for this is not immediately apparent but the two species, although captured in the same general area, tend to segregate with N. rossii in open and deeper channels and N. coriiceps usually under rocks in shallower waters (Jones et al, 2009;Kandalski et al, 2018;Barrera-Oro et al, 2019), which could lead to different exposure to potential pathogens and different immune responsiveness. Some N. coriiceps specimens can be found near the surface in low tide, hiding in rock crevices surrounded by algal debris, thus possibly more exposed to microorganisms.…”

Section: Discussionmentioning

confidence: 99%

LPS Modulates the Expression of Iron-Related Immune Genes in Two Antarctic Notothenoids

et al. 2020

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The non-specific immunity can induce iron deprivation as a defense mechanism against potential bacterial pathogens, but little information is available as to its role in Antarctic fish. In this study the response of iron metabolism related genes was evaluated in liver and head kidney of the Antarctic notothenoids Notothenia coriiceps and Notothenia rossii 7 days after lipopolysaccharide (LPS) injection. Average plasma Fe 2+ concentration was unaffected by treatment in any of the species. The gene expression response to LPS varied between tissues and species, being stronger in N. coriiceps and more prominent in the head kidney than liver. The reaction to LPS was marked by increased individual variability in most genes analyzed, even when the change in expression was not statistically significant, suggesting different individual sensitivity and coping responses in these wild fish. We found that iron related genes had an attenuated and homogenous response to LPS but there was no detectable relationship between plasma Fe 2+ and gene expression. However, overall in both tissues and species LPS exposure set a multilevel response that concur to promote intracellular accumulation of iron, an indication that Antarctic Notothenoids use innate nutritional immunity as a resistance mechanism against pathogens.

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Section: Discussionmentioning

confidence: 99%

LPS Modulates the Expression of Iron-Related Immune Genes in Two Antarctic Notothenoids

et al. 2020

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“…The order Desmarestiales (Phaeophyceae) represents the dominant taxonomic group within the seaweed community, whose canopy can reach up to 80% of the total macroalgal biomass (Amsler et al 1995;Quartino and Boraso de Zaixso 2008). Species of this order provide a three-dimensional habitat and a physical shelter for a large number of invertebrates, such as amphipods, epi-and endophytes, and other associated organisms (Amsler et al 1995;Carlsen et al 2007;Huang et al 2007; Bartsch et al 2008;Barrera-Oro et al 2018). The perennial Antarctic endemic Desmarestia menziesii J. Agardh and Desmarestia anceps Montagne form the highest macroalgal biomass in Antarctic coastal areas (together with Himantothallus grandifolius; Amsler et al 1995;Brouwer 1996).…”

Section: Introductionmentioning

confidence: 99%

Physiological response to irradiance, temperature and co-cultivation in Antarctic engineering brown algae (Desmarestia menziesii and D. anceps)

et al. 2019

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The Western Antarctic Peninsula (WAP) is a hot spot of global warming, including decreased sea-ice cover during winter and increased sedimentation during summer due to glacial melt. Subsequently, an altered irradiance and temperature regime in the water column may affect the performance of primary producers and change competitive structures. The brown, subtidal macroalgae Desmarestia menziesii and D. anceps are ecosystem engineers and of extreme importance for the Antarctic coastal ecosystem. Individuals of both species were collected from the field during the austral summer and exposed in two experiments to different temperatures (2 and 7 °C) or different irradiances (high and low) in combination with co-culturing the two algal species together (two-factorial design). No temperature, irradiance or co-cultivation effects on growth rates of D. menziesii and D. anceps were detected, but effects were possibly masked by the very low growth rates. Both D. menziesii and D. anceps are season anticipators, showing highest growth in late winter/spring and a dormancy state during summer. Photosynthetic efficiency was usually higher at 2 °C and low irradiance conditions compared to 7 °C and high irradiance and no co-culturing effects were detected. Parameters derived from P-E curves (rETR max , E k and α) were higher in D. menziesii compared to D. anceps, reflecting zonation patterns in the field. Future multifactorial experiments, taking seasons and different life-stages into account, are particularly needed to elucidate year-round effects of global warming on macroalgal key species that form the energetic base of the Antarctic coastal food webs.

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“…N. coriiceps feed mainly on zooplankton, zoobenthos and algae, and N. rossii feeds mainly on zooplankton, zoobenthos, and small fish (FishBase 2019). Barrera-Oro et al (2019) also showed that N. coriiceps living in Potter Cove (King George Island, West Antarctica) were more herbivorous than N. rossii and fed mainly on algae and benthos organisms such as snails and clams, while N. rossii ate mainly epibenthos -amphipods and other epibenthic prey.…”

Section: Introductionmentioning

confidence: 94%

Changes in the body chemical composition and the excretion of nitrogen and phosphorus during long-term starvation of Antarctic fish Notothenia coriiceps and Notothenia rossii

Stepanowska

Nędzarek

2020

The European Zoological Journal

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This study examined the effect-of starvation on the chemical composition (total protein, crude fat, dry matter, ash) and the excretion of nitrogen (N) and phosphorus (P) of the Antarctic fish Notothenia coriiceps and Notothenia rossii. Starvation resulted in a decrease in lipid content in both species. In Notothenia coriiceps the body fat content decreased from 2.3% to 1.88% and in Notothenia rossii from 0.82% to 0.6%. Excretion rates of N and P were highest on the first day of starvation, then gradually decreased. Average excretion rates (in µmol N or P h −1 100 g −1) of ammonium nitrogen, organic nitrogen, reactive phosphorus, and organic phosphorus respectively were higher for N. coriiceps (8.71, 2.93, 1.09, 0.46) than N. rossii (6.28, 4.94, 0.54, 0.13). During starvation, the proportion of TON in the total excreted nitrogen was on average 43.5% for N. rossi and 24.1% for N. coriiceps, and remained at a relatively stable level. The study confirmed the natural adaptation of the studied fish to the long-term lack of food, and that the excreted loads of N and P may be a source of biogens for autotrophs and serve as a chemical signal in trophochemoreception. The inter-species differences in the excretion of N and P could be due to the differences in fish size, gonad stage of maturity, and nutritional preferences.

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The importance of macroalgae and associated amphipods in the selective benthic feeding of sister rockcod species Notothenia rossii and N. coriiceps (Nototheniidae) in West Antarctica

Cited by 32 publications

References 47 publications

LPS Modulates the Expression of Iron-Related Immune Genes in Two Antarctic Notothenoids

LPS Modulates the Expression of Iron-Related Immune Genes in Two Antarctic Notothenoids

Physiological response to irradiance, temperature and co-cultivation in Antarctic engineering brown algae (Desmarestia menziesii and D. anceps)

Changes in the body chemical composition and the excretion of nitrogen and phosphorus during long-term starvation of Antarctic fish Notothenia coriiceps and Notothenia rossii

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