Histological analysis provides further insights into Harpagifer antarcticus reproductive biology at the western Antarctic Peninsula

Novillo, Manuel; Moreira, Eugenia; Macchi, Gustavo J.; Barrera-Oro, Esteban

doi:10.1007/s00300-021-02953-x

Cited by 2 publications

(1 citation statement)

References 32 publications

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“…These three species share a similar intertidal habitat during part of their life cycle, particularly in the South Shetland Islands and KGI. 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).…”

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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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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Species composition, distribution and relative abundance of the inshore fish community off the Argentine Islands, Bellingshausen Sea

et al. 2022

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In the last three decades, several interdisciplinary studies investigated the marine ecosystems off the West Antarctic Peninsula (WAP), one of the most impacted areas of the Southern Ocean by the global warming. Although the extent of near-shore habitats along the WAP is wider than elsewhere in Antarctica, the coastal fish communities have been rarely studied. Complementing these previous studies, we provide new data on the species composition, population structure and relative abundance of the inshore fish community living off the Argentine Islands (Bellingshausen Sea). Fish samples were caught all the year round during four different periods spread over ten years (from 2006 to 2017). The fish fauna consisted of fourteen high-Antarctic and low-Antarctic species of notothenioids, most of them belonging to the Nototheniidae. Notothenia coriiceps was by far the most abundant species, followed in decreasing abundance by Chaenocephalus aceratus, Notothenia rossii, Trematomus newnesi and Trematomus bernacchii. Our findings provide context for future ecological studies as this area represents either a spawning and nursery area for multiple species in this study. More generally, the inshore waters off the Argentine Islands represent the southern limit of distribution for several low-Antarctic species, and our results provide critical baseline data for assessing possible disruptions in population dynamics driven by the ongoing climate change.

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Histological analysis provides further insights into Harpagifer antarcticus reproductive biology at the western Antarctic Peninsula

Cited by 2 publications

References 32 publications

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

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

Species composition, distribution and relative abundance of the inshore fish community off the Argentine Islands, Bellingshausen Sea

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