The effect of water movement, temperature and salinity on abundance and reproductive patterns of Macrocystis spp. (Phaeophyta) at different latitudes in Chile

Buschmann, Alejandro H.; Vásquez, Julio A.; Osorio, Pamela Castro; Reyes, Elijah; Filún, Luis; Hernández-González, María C.; Vega, Alejandro A.

doi:10.1007/s00227-004-1393-8

Cited by 137 publications

(128 citation statements)

References 29 publications

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“…For instance, based on the spatial distribution of siphonophores and neustonic communities off Northern and Southern Ice Field channels in southern Chile, Palma et al (2014) and Cañete et al (2016) found biota from very low salinity environments in areas with surface salinities between 27 and 28 near river mouths. The same trend seems to be followed by seaweed species like the kelp M. pyrifera (Buschmann et al, 2004).…”

Section: Discussionsupporting

confidence: 54%

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

Cañete

Díaz-Ochoa

Figueroa

et al. 2017

lajar

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ABSTRACT. We document latitudinal patterns of infestation of the bopyrid parasite isopod Pseudione tuberculata on southern king crab Lithodes santolla juveniles (20-77 mm carapace length) recruited to fishing grounds in the southern Chilean fjord system. Seven hundred and fifty individuals were collected by semiautonomous diving in 11 of 21 sampling locations in the study area, along the western margin of the Magellan region between August and October 2013.The prevalence of P. tuberculata varied between 0 and ~22%, and displayed a spatial pattern associated with three areas: i) northern Beagle Channel (10 to ~22%; lengths between 37 and 47 mm), ii) northwestern Navarino Island without infestations (0%; 26-55 mm), and iii) Piazzi IslandCapitán Aracena Island (0-12%; 50-77 mm). Infestations were independent of host sex, while parasite prevalence decreased with host length. No parasites were observed on crabs longer than 60 mm. A comparison of slopes between linearized length-weight regressions suggests that parasitized individuals had lower weight growth than uninfested individuals. Both southern king crab juvenile density and P. tuberculata prevalence were higher in fishing areas towards Beagle Channel where previous research reported lower average surface water temperatures (<6.5°C) and higher surface water salinity (>30). The study area covers five zones relevant for the conservation and protection of sub Antarctic biodiversity, and provides opportunities for large-scale geographic studies of the host-parasite relationship.

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Section: Discussionsupporting

confidence: 54%

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

Cañete

Díaz-Ochoa

Figueroa

et al. 2017

lajar

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“…Placing new cultures in the sea during spring (beginning in October) is not recommended since most of the small sporophytes did not survive, and those that did showed little growth and low production (6 kg m −1 ). These poor biomass production results can be attributed to an increase in water temperature that may reach up to 20°C (Zúñiga and Acuña 2002) because this species is highly sensitive to temperature, preferring low temperature for developing microscopic sporophytes (Buschmann et al 2004). Another reason may be due to its sensitivity to higher irradiances (over 500 µmol photons m −2 s −1 at sea surface) during summer, which can increase sporophyte mortality during its early stages of development (Bulboa, unpublished data).…”

Section: Discussionmentioning

confidence: 99%

Production of Macrocystis pyrifera (Laminariales; Phaeophyceae) in northern Chile on spore-based culture

2010

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Since the establishment of abalone farming, there has been an increase in the demand for Macrocystis as a food source. Therefore, the pressure on natural stock has also augmented and the sustainability of the actual harvesting practices has been questioned. In this article, an attempt to farm Macrocystis pyrifera by zoospores in northern Chile is described; initially under laboratory conditions and subsequently by cultivation in the sea. The experiments were executed during 1 year and two different cultivation methodologies were used: a direct and an indirect method. A maximum frond length of 175 cm was reached and 22 kg m −1 of rope was produced after 120 to 150 days of cultivation in the sea. The algae grew under both methodologies, and no differences in algal length and biomass were detected between the two cultivation systems. However, the direct culture method can be recommended for productive and practical reasons.

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“…As discussed in greater detail in the 'Discussion', there are distinct differences in the carbon and nitrogen isotope signatures of inputs delivered via upwelling circulation, advection of oceanic surface waters, and terrestrial sources (Fogel et al 1992, Rau et al 1998, Kjonaas & Wright 2007) that allow us to investigate how Macrocystis uses the multi-source subsidies throughout the year. Because DIC and nitrate delivery to the surface of Macrocystis blades is dependent on basin-wide circulation and turbulent water mixing (Hurd 2000, Buschmann et al 2004, the rate of delivery and concentration of inputs can vary substantially over the course of a year and potentially cause significant variation in the isotope values of Macrocystis.…”

Section: Introductionmentioning

confidence: 99%

Correlation between allochthonous subsidy input and isotopic variability in the giant kelp Macrocystis pyrifera in central California, USA

Foley¹,

Koch²

2010

Mar. Ecol. Prog. Ser.

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Isotope values of primary producers can vary greatly across space and time due to changes in physiological status and the source of subsidies used in photosynthesis. Forests of the giant kelp Macrocystis occur in temperate oceans around the world and are positioned at the land -sea interface where they may receive subsidies from terrestrial and open ocean sources. In this study, we investigated the spatial and temporal variability in δ 13 C and δ 15 N values of M. pyrifera over 3 yr in Big Sur, California, USA. During each of those 3 yr, δ 13 C and δ 15 N values of M. pyrifera varied significantly by season, with low values occurring in the spring, and high values in the fall. To examine the possible mechanisms driving this seasonal variability, we used step-wise multiple regression analyses to test whether the variability in kelp isotope values was correlated with the variability in nitrate concentration or the delivery of subsidies via upwelling circulation and river discharge. We found that temporal variation in kelp isotope values was most strongly related to the strength of upwelling and the concentration of nitrate in surface waters. The results of this study increase our understanding of the mechanisms that drive the temporal and seasonal isotopic variability in marine primary producers. This study also highlights the importance of measuring isotope variability at the base of the food chain in order to create more robust trophic predictions.

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The effect of water movement, temperature and salinity on abundance and reproductive patterns of Macrocystis spp. (Phaeophyta) at different latitudes in Chile

Cited by 137 publications

References 29 publications

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

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

Production of Macrocystis pyrifera (Laminariales; Phaeophyceae) in northern Chile on spore-based culture

Correlation between allochthonous subsidy input and isotopic variability in the giant kelp Macrocystis pyrifera in central California, USA

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