Overview of recent advances in oceanographic, ecological and fisheries research on oceanic islands in the southeastern Pacific Ocean

Fernández, Miriam; Hormazábal, Samuel

doi:10.3856/vol42-issue4-fulltext-1

Cited by 10 publications

(10 citation statements)

References 27 publications

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“…The in situ and monthly mean data of sea surface temperature and salinity are in agreement with other studies that show the surface predominance of subtropical water (STW) in Desventuradas, while in Juan Fernández, subantarctic water (SAAW) prevails (Bahamonde, 1987; Moraga & Argandoña, 2001; Silva et al ., 2009; Aniñir Velásquez, 2019). It is important to add the possible presence of equatorial subsurface water (ESSW) below 200 m, as found in other studies (Yáñez et al ., 2009; Frederick et al ., 2018; Fierro, 2019), but that could not be corroborated in our study due to limited CTD data from deep water.…”

Section: Discussioncontrasting

confidence: 70%

“…The Juan Fernández archipelago is formed by the islands Alejandro Selkirk (33°45′S 80°45′W), Robinson Crusoe (33°40′S 78°50′W) and Santa Clara (33°42′S 79°00′ W), whereas the little known Desventuradas archipelago comprises the San Félix (25°15′S 80°07′W) and San Ambrosio (26°20′S 79°58′W) islands (Aguirre et al ., 2009); both archipelagos are surrounded by numerous seamounts. In the oceanic islands and seamount regions of the SEP, some studies on plankton have shown slight increments in phytoplankton biomass in nearby waters (Yáñez et al ., 2009; Von Dassow & Collado-Fabbri, 2014; Andrade et al ., 2014 a ) and high diversity (although low biomass) of zooplankton (Vinogradov, 1991; Robledo & Mujica, 1999; Palma & Silva, 2006; Frederick et al ., 2018; Fierro, 2019). The high biodiversity of zooplankton has been associated with ecological connectivity promoted by mesoscale activity, which allows the transport of plankton and nutrients from the highly productive coastal upwelling zone off Chile (Andrade et al ., 2012; Andrade et al ., 2014 b ).…”

Section: Introductionmentioning

confidence: 99%

“…Some studies have addressed zooplankton groups in this zone with regard to their composition, geographic distribution and abundance. These include Chaetognata and Decapoda larvae (Petrillo et al ., 2005), euphausiids (Mujica & Pavez, 2008) and copepods (Frederick et al ., 2018; Fierro, 2019). Studies on other zooplankton groups, such as hyperiid amphipods are scarce (Meruane, 1982; Vinogradov, 1991).…”

Section: Introductionmentioning

confidence: 99%

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The community structure of hyperiid amphipods associated with two seamount regions in the South-east Pacific

et al. 2021

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Oceanic islands and seamounts are considered biodiversity hotspots. Here, we present a taxonomy and community analyses of hyperiid amphipods collected near oceanic islands and over seamounts of the Juan Fernández Archipelago and Desventuradas Archipelago in the South-east Pacific. Both archipelagos are separated by about 800 km over the meridional gradient, suggesting the existence of different hyperiid communities because of apparent geographic isolation and distinctive oceanographic characteristics between regions. To test this hypothesis, zooplankton samples were collected from 19 stations during the CIMAR 22 ‘Oceanic Island’ cruise in October–November 2016. In total, 56 species of hyperiids were found, of which Phrosina semilunata, Lestrigonus schizogeneios, Hyperietta stephenseni, Hyperioides longipes, Phronimella elongata and Primno latreillei were the most abundant and recurrent species. The species richness (S), Shannon–Wiener diversity (H’) and dominance (D) of both the archipelagos were not significantly different. Additionally, except for a small group of rare species, the species composition was similar in both areas. Most species showed greater abundances than those observed in the coastal upwelling zone off Chile, whereas shared species between regions suggested the presence of a single biogeographic unit comprising the coastal transition zone and oceanic area off Chile within which both archipelagos are included. Correlation analysis indicated that salinity was the best predictor for the community structure, which provides evidence that the contributions of previously described water masses of the South-east Pacific may influence the spatial distribution and composition of the hyperiid community.

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Section: Discussioncontrasting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The community structure of hyperiid amphipods associated with two seamount regions in the South-east Pacific

et al. 2021

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“…In fact, the first marine protected areas surrounding these islands were created in the last two years, ten years after the same occurred for Chilean continental islands. This occurred despite the high concentration of endemic species (Di Salvo et al, 1988;Fernández & Hormazábal, 2014; and the increasing pressure from fisheries activities around the Chilean oceanic islands (Castilla & Rozbaczylo, 1987;Zylich et al, 2014).…”

Section: Geographic Distributionmentioning

confidence: 99%

“…These works describe 70 species present along Easter Island's littoral zone (Kohn & Lloyd, 1973b;. Most are circumtropically distributed and are present in the western Indo-Pacific (Kohn & Lloyd, 1973b;Fernández & Hormazábal, 2014).…”

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confidence: 99%

First record of Parasphaerosyllis indica Monro, 1937 (Polychaetae: Syllidae) from Easter Island, Chile

Cañete

2017

lajar

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ABSTRACT. This study is the first to report the presence of the polychaete Parasphaerosyllis indica Monro, 1937 (Syllidae) near the coastal areas of Easter Island (27°10'S, 109°20'W). This species has a circumtropical geographic distribution and low abundance and frequency rates in relation to other Syllidae species (12) collected from Easter Island. With P. indica, the benthic polychaetes biodiversity of Easter Island is now 71 species.

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Unexplored diversity of the mesophotic echinoderm fauna of the Easter Island ecoregion

et al. 2019

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The Easter Island Ecoregion (EIE) is one of the most remote marine areas of the world and encompasses a vast and fragile ecosystem including oceanic islands and seamounts. In March 2016, a remotely operated vehicle was used to explore a subsurface peak off Easter Island (27.23º S, 109.48º W) and a seamount (26.92º S, 110.26º W), respectively located 10 km southwest and 98 km west of the island. More than 950 echinoderms were observed in the five hours of video recorded during the seven dives conducted at depths between ~160 and ~280 m. The communities of echinoderms observed at these depths markedly differed from those reported for shallower waters near Easter Island. Of the 20 morphospecies reported in the present study, only five were previously reported in the EIE. One species, six genera, and three families were reported for the first time in this area, and two new genera were discovered and described. A preliminary biogeographic analysis suggests affinities between the observed echinoderms and those of the West Pacific. These findings highlight the uniqueness of these assemblages, and therefore the importance of considering them in the establishment of effective management strategies of these communities, which are within the Rapa Nui Marine Protected Area created in 2017.

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Overview of recent advances in oceanographic, ecological and fisheries research on oceanic islands in the southeastern Pacific Ocean

Cited by 10 publications

References 27 publications

The community structure of hyperiid amphipods associated with two seamount regions in the South-east Pacific

The community structure of hyperiid amphipods associated with two seamount regions in the South-east Pacific

First record of Parasphaerosyllis indica Monro, 1937 (Polychaetae: Syllidae) from Easter Island, Chile

Unexplored diversity of the mesophotic echinoderm fauna of the Easter Island ecoregion

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