The specialized diet of Harpagifer bispinis:

Duarte, William E.; Moreno, Carlos

doi:10.1007/bf00018363

Cited by 25 publications

(8 citation statements)

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“…Individuals of Gondogeneia antarctica (CHEVREUX, 1906) are the most abundant amphipod in the shallow waters of Admiralty Bay JAZDZEWSKI, 1993). They are very suitable as biological material for this kind of study for a number of reasons: they are highly abundant in the subtidal zone of west Antarctica and are of great importance in coastal food webs (RICHARDSON, 1975;DUARTE;MORENO, 1981;JAZDZEWSKI et al, 2001); they can be easily collected during low tides with a hand net; they are very resistant and feed well in captivity. Our research group selected them as bioindicator organisms for biomonitoring studies after a long series of trials with a great number of species, due to their sensibility and the constancy of their responses to variations in environmental factors (GOMES et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Metabolic rates of the antarctic amphipod Gondogeneia antarctica at different temperatures and salinities

et al. 2013

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A B S T R A C TChanges in environmental factors may deeply affect the energy budget of Antarctic organisms as many of them are stenothermal and/or stenohaline ectotherms. In this context, the aim of this study is to contribute to knowledge on variations in the energy demand of the Antarctic amphipod, Gondogeneia antarctica as a function of temperature and salinity. Experiments were held at the Brazilian Antarctic Station "Comandante Ferraz", under controlled conditions. Animals collected at Admiralty Bay were acclimated to temperatures of 0°C; 2.5°C and 5°C and to salinities of 35, 30 and 25. Thirty measurements were made for each of the nine combinations of the three temperatures and three salinities, totalling 270 measurements. Metabolic rates were assessed by oxygen consumption and total nitrogenous ammonia excretion, in sealed respirometers. When acclimated to salinities 30 or 35, metabolic rates at 0°C and 2.5°C were very similar indicating a possible mechanism of metabolic compensation for temperature. At 5.0°C, however, metabolic rates were always higher. Lower salinities enhanced the effects of temperature on metabolism and ammonia excretion rates. The physiological adaptations of individuals of G. antarctica suggest adaptive mechanisms for energy saving, adjusted to an environment with stable conditions of temperature and salinity. Little is known about the joint effects of salinity and temperature and this study is an important contribution to the understanding of the mechanism of polar organisms in their adaptation to both factors. R E S U M OAlterações ambientais podem modificar a alocação de energia dos organismos, principalmente dos ectotermos estenotérmicos e/ou estenohalinos. Nesse contexto, este trabalho contribui com o conhecimento da demanda de energia do anfípode antártico Gondogeneia antarctica em função da temperatura e da salinidade. Experimentos foram realizados na Estação Antártica Brasileira "Comandante Ferraz", em condições laboratoriais controladas. Animais coletados na Baía do Almirantado foram aclimatados a temperaturas de 0°C; 2.5°C e 5°C e salinidades de 35, 30 and 25. Foram realizadas trinta medições para cada uma das nove combinações das três temperaturas com as três salinidades, totalizando 270 medições. As taxas metabólicas foram estimadas por meio do consumo de oxigênio e excreção de amônia, em câmaras respirométricas seladas. Quando aclimatados a salinidades 30 ou 35, as taxas metabólicas a 0°C e 2.5°C foram semelhantes indicando possível mecanismo de compensação térmica, nessa faixa de variação dos fatores. A 5.0°C, no entanto, as taxas metabólicas foram sempre mais elevadas. Baixas salinidades potencializaram os efeitos da temperatura no consumo de oxigênio e na excreção de produtos nitrogenados. Os resultados estão relacionados a mecanismos adaptativos para economia de energia em indivíduos G. antarctica, ajustados a um ambiente que tem condições estáveis de temperatura e de salinidade. Pouco se sabe sobre os efeitos conjugados da salinidade e temperatura nos organismos e...

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Section: Introductionmentioning

confidence: 99%

Metabolic rates of the antarctic amphipod Gondogeneia antarctica at different temperatures and salinities

et al. 2013

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“…A wider morphospace of the head and fin insertion in H. antarcticus may be related to the growing capabilities to ingest more and bigger prey as individuals increase in length, irrespective of prey composition. Additionally, the intraspecific variability of the head may be associated with the opportunistic behavior in its feeding habits described elsewhere (e.g., ambush feeder, Duarte & Moreno, 1981;Daniels, 1982). For example, Casaux (1998) described differences in the diet with depth, as H. antarcticus relied mostly on gammarid amphipods (G. antarctica) in shallow waters, whereas in deeper waters (46-110 m depth) they fed on the euphausiid E. superba.…”

Section: Discussionmentioning

confidence: 99%

“…The spiny plunderfish spawn during late spring–summer (Novillo et al, 2021), constructing nests guarded by the males, from which hatch small‐sized larvae with relatively fast larval growth (5.36 and 0.17 mm day −1 , respectively, La Mesa et al, 2017) and great feeding plasticity triggered by changes in the environment (Landaeta et al, 2017). After settlement, this species shows different prey preferences based on depth and location, preying mainly on amphipods, isopods, euphausiids, and polychaetes (Casaux, 1998; Daniels, 1982; Duarte & Moreno, 1981). The lifestyle of H. antarcticus , with its low fecundity and short pelagic phase, may promote the isolation of populations across Antarctica.…”

Section: Introductionmentioning

confidence: 99%

Morphology and diet are decoupled in nearshore notothenoids from King George Island, West Antarctica

Landaeta,

Pareja,

Hüne

et al. 2023

Journal of Fish Biology

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Antarctic notothenioid fishes show wide adaptive morphological radiation, linked to habitat preferences and food composition. However, direct comparisons of phenotypic variability and feeding habits are still lacking, particularly in stages inhabiting nearshore areas. To assess these relationships, we collected juveniles and adults of the most common benthic species inhabiting shallow waters off the South Shetland Islands within a similar size range, the plunderfish Harpagifer antarcticus, the black rockcod Notothenia coriiceps, and the marbled rockcod Notothenia rossii. Individual size ranges varied from 44.0 to 98.9 mm standard length (LS) (H. antarcticus), from 95.8 to 109.3 mm LS (N. coriiceps), and from 63.0 to 113.0 mm LS (N. rossii). Notothenioid fish showed different morphospace variability, being larger for H. antarcticus than the other Notothenia species and associated with the position of the posterior end of the operculum, along with the location and relative size of the eye. The evolutionary allometry was low, but the static allometry was much higher, especially for H. antarcticus and N. rossii. The diet was mainly carnivorous, consisting of amphipods and euphausiids. Macroalgae were scarce or totally absent in the gut contents of all species. Only H. antarcticus showed an increase in the prey number and ingested prey volume with fish size. Finally, there was a significant covariation between shape changes and LS in all species (allometric effects), however, not with prey composition, probably due to the small size range or ontogenetic stage and the relative similarity (or lack of contrast) in the benthic environment that they utilized.

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“…This commensalism would be mediated by the capacity of Aliivibrio to degrade chitin, a highly conserved metabolism in the Vibrionaceae family, as confirmed by the detection of chitinase activity in Aliivibrio strains (95). Chitin is the most abundant biopolymer in the ocean (96), since it constitutes the exoskeleton of crustaceans such as copepods, amphipods and krill (97,98), which are known to be part of the Harpagifer diet (47,99,100). Further, as the microbial metabolization of chitin aminopolysaccharide provides substantial source of carbon and nitrogen easily accessible for the host, a mutualistic cross-feeding is imaginable between Harpagifer and Aliivibrio, providing an ecological advantage to the holobiont (101,102).…”

Section: Around Half Of the Core Bacterial Taxa Harbored Strong Signa...mentioning

confidence: 93%

Unveiling the co-phylogeny signal between plunderfishHarpagiferspp. and their gut microbiomes across the Southern Ocean

Schwob

Cabrol

Saucède

et al. 2023

Preprint

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Understanding the factors that sculpt fish gut microbiome is challenging, especially in natural populations characterized by high environmental and host genomic complexity. Yet, closely related hosts are valuable models for deciphering the contribution of host evolutionary history to microbiome assembly, through the underscoring of phylosymbiosis and co-phylogeny patterns. Here, we hypothesized that the recent allopatric speciation ofHarpagiferacross the Southern Ocean (1.2–0.8 Myr) will promote the detection of robust phylogenetic congruence between the host and its microbiome.We characterized the gut mucosa microbiome of 77 individuals from four field-collected species of the plunderfishHarpagifer(Teleostei, Notothenioidei), distributed across three biogeographic regions of the Southern Ocean. We found that seawater physicochemical properties, host phylogeny and geography collectively explained 35% of the variation in bacterial community composition inHarpagifergut mucosa. The core microbiome ofHarpagiferspp. gut mucosa was characterized by a low diversity, mostly driven by selective processes, and dominated by a singleAliivibriotaxon detected in more than 80% of the individuals. Almost half of the core microbiome taxa, includingAliivibrio, harbored co-phylogeny signal at microdiversity resolution withHarpagiferphylogeny. This suggests an intimate symbiotic relationship and a shared evolutionary history withHarpagifer.The robust phylosymbiosis signal emphasizes the relevance of theHarpagifermodel to understanding the contribution of fish evolutionary history to the gut microbiome assembly. We propose that the recent allopatric speciation ofHarpagiferacross the Southern Ocean may have generated the diversification ofAliivibriointo patterns recapitulating the host phylogeny.ImportanceAlthough challenging to detect in wild populations, phylogenetic congruence between marine fish and its microbiome is critical, as it allows highlighting potential intimate associations between the hosts and ecologically relevant microbial symbionts.Through a natural system consisting of closely related fish species of the Southern Ocean, our study provides foundational information about the contribution of host evolutionary trajectory on gut microbiome assembly, that represents an important yet underappreciated driver of the global marine fish holobiont. Notably, we unveiled striking evidence of co-diversification betweenHarpagiferand its microbiome, demonstrating both phylosymbiosis of gut bacterial communities, and co-phylogeny of specific bacterial symbionts, in patterns that mirror the host diversification. Considering the increasing threats that fish species are facing in the Southern Ocean, understanding how the host evolutionary history could drive its microbial symbiont diversification represents a major challenge to better predict the consequences of environmental disturbances on microbiome and host fitness.

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The specialized diet of Harpagifer bispinis:

Cited by 25 publications

References 10 publications

Metabolic rates of the antarctic amphipod Gondogeneia antarctica at different temperatures and salinities

Metabolic rates of the antarctic amphipod Gondogeneia antarctica at different temperatures and salinities

Morphology and diet are decoupled in nearshore notothenoids from King George Island, West Antarctica

Unveiling the co-phylogeny signal between plunderfishHarpagiferspp. and their gut microbiomes across the Southern Ocean

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