Infestation of Pseudione tuberculata (Isopoda: Bopyridae) on juveniles of Lithodes santolla (Magellan region, Chile): a spatial mesoscale analysis

Cañete, Juan I.; Díaz-Ochoa, Javier; Figueroa, Tania; Medina, Alvaro

doi:10.3856/vol45-issue1-fulltext-8

Cited by 7 publications

(8 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Dayton [ 16 ] noted that kelp in wave protected areas of the southern Magellanic fjords appeared brittle and unhealthy due to shading by surface kelp blades. In addition, there is a strong salinity gradient within the region, which ranges from 20 to 25 ppt in the fjords of Francisco Coloane MP, between 30 and 33 ppt within the Cape Horn Archipelago, and 33–34 ppt at Diego Ramírez [ 69 ]. The differences in wave exposure and salinity likely account for the differences in kelp densities that we observed.…”

Section: Discussionmentioning

confidence: 99%

Marine biodiversity at the end of the world: Cape Horn and Diego Ramírez islands

et al. 2018

View full text Add to dashboard Cite

The vast and complex coast of the Magellan Region of extreme southern Chile possesses a diversity of habitats including fjords, deep channels, and extensive kelp forests, with a unique mix of temperate and sub-Antarctic species. The Cape Horn and Diego Ramírez archipelagos are the most southerly locations in the Americas, with the southernmost kelp forests, and some of the least explored places on earth. The giant kelp Macrocystis pyrifera plays a key role in structuring the ecological communities of the entire region, with the large brown seaweed Lessonia spp. forming dense understories. Kelp densities were highest around Cape Horn, followed by Diego Ramírez, and lowest within the fjord region of Francisco Coloane Marine Park (mean canopy densities of 2.51 kg m-2, 2.29 kg m-2, and 2.14 kg m-2, respectively). There were clear differences in marine communities among these sub-regions, with the lowest diversity in the fjords. We observed 18 species of nearshore fishes, with average species richness nearly 50% higher at Diego Ramírez compared with Cape Horn and Francisco Coloane. The number of individual fishes was nearly 10 times higher at Diego Ramírez and 4 times higher at Cape Horn compared with the fjords. Dropcam surveys of mesophotic depths (53–105 m) identified 30 taxa from 25 families, 15 classes, and 7 phyla. While much of these deeper habitats consisted of soft sediment and cobble, in rocky habitats, echinoderms, mollusks, bryozoans, and sponges were common. The southern hagfish (Myxine australis) was the most frequently encountered of the deep-sea fishes (50% of deployments), and while the Fueguian sprat (Sprattus fuegensis) was the most abundant fish species, its distribution was patchy. The Cape Horn and Diego Ramírez archipelagos represent some of the last intact sub-Antarctic ecosystems remaining and a recently declared large protected area will help ensure the health of this unique region.

show abstract

Section: Discussionmentioning

confidence: 99%

Marine biodiversity at the end of the world: Cape Horn and Diego Ramírez islands

et al. 2018

View full text Add to dashboard Cite

show abstract

“…2) In this area, between 60 and 80% of the total abundance of three typical neustonic species was estimated: copepodites of pelagic harpacticoid copepod Microsetella rosea, larvae of the polychaete Polygordius sp and cyphonautes larvae of bryozoan Membranipora isabelleana (Cañete et al, 2016(Cañete et al, , 2019. Such spatial scale correspond to mesoscale (Mann, Lazier, 1991;Cañete et al, 2017). The neuston was collected with a net of 50 x 35 cm of mouth area, mesh net of 43 µm, which was dragged for 5 minutes with a velocity of 2 kn (horizontal drag = 500 m 2 ) (Cañete et al, 2016(Cañete et al, , 2019…”

Section: Resultsmentioning

confidence: 99%

Importance of Remote Sensing for the Study of Spatial Dynamics of Estuarine Neuston From Southern Chile

Cañete¹,

Cárdenas²,

Frangópulos³

et al. 2020

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

Abstract. Zooplankton aggregation, hydrographic and remote sensing data were employed to relate the spatial dynamics of neustonic communities with chlorophyll a (Chl a) and suspended organic matter (SOM) at a spatial mesoscale (10 to 1000 km) in the southern Chilean fjords system along Magellan Strait, Chile (CIMAR 16: October/November 2010 and CIMAR 25; September/October 2019) in order to identify oceanographic process producing aggregation of neuston. Preliminary evidence of CIMAR 25 shows significant concentrations of Chl a and SOM around Dawson Island (DI), Magellan Strait. During CIMAR 16 important aggregation of specific neustonic taxa (copepodites of Microsetella rosea, larvae of the polychaete Polygordius sp and cyphonautes of the bryozoan Membranipora isabelleana) was observed around DI, Magellan Strait. Satelital images in the area of CIMAR 16 provide evidence of important aggregation of chlorophyll a/SOM around DI. CIMAR Cimar 25 showed that the Chl a and SOM aggregation around DI is recurrent and could to explain the high concentration of neuston around this island to spite of mesotrophic conditions. Remote sensing in this study area provides a tool to understanding oceanographic and topographic factors that potentially regulate the abundance and spatial distribution of surface zooplankton to spatial meso-scale along Magellan Strait.

show abstract

“…4a-d), being very useful for the monitoring of climate change, pollution and acidification scenery on biological communities living in surface layer of the sea. Thus, along the austral zone of Chile there are different oceanographic regimes associated to change in salinity that could to affect the composition, abundance and biodiversity of the estuarine neuston, allowing the monitoring through of changes in the spatial distribution of Polygordius exolarvae to mesoscale level (Cañete et al 2017).…”

Section: Utility Of Polygordius Exolarvae As Biological Tracer Of Neumentioning

confidence: 99%

Abundance and spatial distribution of Polygordius (Polychaeta: Polygordiidae) neustonic exolarvae in estuaries from southern Chile

Cañete

Gallardo

Medina

et al. 2019

Anales Instituto Patagonia (Chile)

Self Cite

View full text Add to dashboard Cite

Integration of meroplankton abundance and hydrographic data was employed to relate the Polygordius exolarvae spatial dynamics with different salinity gradients in order to define the factors that regulate the abundance and spatial distribution along the large estuarine system from southern Chile. The present study aims: i) record the abundance and spatial distribution of Polygordius neustonic exolarvae along of the estuaries with different gradients of salinity located between Guafo Channel, southern Chiloé Island (44º S) to Navarino Island (55º S), Chile; ii) connect this distributional pattern to oceanographic parameters to determine if members of this genus have adapted to euryhaline or stenohaline conditions, and iii) establish a comparison between the abundance of Polygordius and others meroplanktonic taxa collected during CIMAR Cruises 16, 18 and 20 Fjords. Neustonic samples were collected during three oceanographic cruises along southern Chilean fjord/channel systems (~ 1,700 km) with different freshwater supply regimes (CIMAR 16: October/November, 2010, 52º to 55º S; CIMAR 18: June/July, 2012, 44º to 47º S; CIMAR 20: October, 2014, 47º to 50º S), providing evidence to relate the influence of surface salinity on the Polygordius exolarvae spatial distribution of abundance. Polygordius exolarvae (average length=2.9 ± 0.8 mm), the most abundant meroplanktonic taxa within the neustonic community (54.04% of total abundance; 66,228 individuals; N Total =26 stations), was represented at 81% of stations sampled in CIMAR 16 (mean salinity=30.7 psu), showing higher abundance (1,518 ind. x 5 min of horizontal drag) than for other polychaete larvae (10 types) and other meroneustonic taxa; 60% of the abundance of exolarvae during CIMAR 16 was collected around Dawson Island, Magellan Strait. In CIMAR 18 cruise (mean salinity=24.28 psu), abundance of exolarvae was low (3 ind. x 5 min of horizontal drag) and were collected only at 5 stations along the Moraleda Channel (N Total =31 stations); no exolarvae were collected during CIMAR 20 (N total =39 stations) (mean salinity= 23.26 psu). Polygordius exolarvae have narrow haline/thermal requirements during their pelagic life, where sills and island mass effect could produce a restricted and aggregated spatial distribution in some areas of the study zone.

show abstract

Infestation of Pseudione tuberculata (Isopoda: Bopyridae) on juveniles of Lithodes santolla (Magellan region, Chile): a spatial mesoscale analysis

Cited by 7 publications

References 43 publications

Marine biodiversity at the end of the world: Cape Horn and Diego Ramírez islands

Marine biodiversity at the end of the world: Cape Horn and Diego Ramírez islands

Importance of Remote Sensing for the Study of Spatial Dynamics of Estuarine Neuston From Southern Chile

Abundance and spatial distribution of Polygordius (Polychaeta: Polygordiidae) neustonic exolarvae in estuaries from southern Chile

Contact Info

Product

Resources

About