Functionality of photobiological traits of the giant kelp (Macrocystis pyrifera) as key determinant to thrive in contrasting habitats in a sub-Antarctic region

The Science of The Total Environment, Год журнала: 2025, Номер 971, С. 179055 - 179055

Опубликована: Март 1, 2025

Язык: Английский

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Applications of environmental DNA monitoring for seaweed reproductive phenology: A case study with giant kelp (Macrocystis pyrifera)

Journal of Phycology, Год журнала: 2025, Номер unknown

Опубликована: Март 18, 2025

Abstract Monitoring the seasonal reproductive cycles of seaweeds is crucial for effective population and ecosystem management, as well mariculture seedstock collection. Traditional methods, such visual monitoring by SCUBA diving or snorkeling, are costly, labor‐intensive, limited in temporal spatial coverage. This study explores substituting these methods with environmental DNA (eDNA) techniques giant kelp ( Macrocystis pyrifera , order Laminariales). laboratory aimed to determine minimum detectable concentration zoospores sporophyte tissue needed detecting phenology M. assess ability sensitivity discriminate between life stages. The involved syringe‐filtering seawater samples through 0.45‐μm pore‐size filters before quantitative polymerase chain reaction (qPCR) analysis species‐specific primers. There was a strong positive correlation zoospore eDNA copies per μL (ρ = 0.982, p < 0.001), weak wet weight 0.367, 0.134). significant difference + treatments 0.010), indicating substantial influence on detected quantity. Sporophyte obscures signal, especially at lower concentrations (<37 · mL −1 ), highlighting that suitable peaks broader patterns reproduction when high.

Язык: Английский

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First photosynthetic characterization of the giant kelp Macrocystis pyrifera from the Comau Fjord, Northern Patagonia region

Research Square (Research Square), Год журнала: 2025, Номер unknown

Опубликована: Апрель 17, 2025

Giant kelp (Macrocystis pyrifera) covers large coastal areas along the Comau Fjord (Northern Patagonia), following different environmental gradients that determine its structural complexity. In present study, we compared morphological (thallus length and biomass, holdfast diameter, blade morphology, etc.) photobiological characteristics based on fluorescence (Effective Quantum Yield P-I Curve Parameters) of six populations coast in three areas: Lilihuapi Island, Cahuelmo sector interior. The main results show Fjord, found conformations M. pyrifera populations, where only at mouth fjord was it possible to record a well-established “kelp forest”, while interior “cords” parallel coastline predominated. major differences between these types were related shape blades (e.g., > 4-CF, 5-Cf, 6-Cf), being this photo-acclimation strategy responds marked gradient fjord, addition particular geomorphology, surrounded by mountain ranges, which limits availability light during pre-winter period, translates into balance photosynthetic efficiency (α = 0.41, p < 0.05 sites) optimizing absorption. These adaptations help algae resist local seasonal changes water column conditions, adjusting use low levels, similar Antarctic brown algae, cope with conditions. This type study corresponds first physiological characterization natural area Northern Patagonia underlines importance continuing collect information broader spatio-temporal scale understand how stressors influence morphology physiology region is suffering consequences global climate change, such as Patagonia, also intensely impacted anthropogenic activities.

Язык: Английский

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The response of trophic interaction networks to multiple stressors along a large-scale latitudinal range in the Southern Hemisphere

Environmental Reviews, Год журнала: 2024, Номер unknown

Опубликована: Июнь 27, 2024

Ecological networks offer valuable insights into community structure, key species identification, and ecosystem management. Understanding how these respond to global change stressors is of increasing interest, especially along geographical gradients. This review summarizes potential stressor responses in marine food webs from the Southwest Atlantic Antarctic (45–78°S), encompassing areas such as San Jorge Gulf, Beagle Channel, Burdwood Bank, Scotia Sea, Potter Cove, Weddell Sea Antarctica. The objectives are (1) describe structure this latitudinal axis using a network approach; (2) identify predominant change-related affecting each ecosystem; (3) summarize observed web changes hypothesize on impacts. effects were primarily reviewed at level. Alternative hypotheses for study area formulated considering (a) main stressors; (b) impacted parameters; (c) node-level properties; (d) network-level properties. Global warming emerges most common among studied across gradient, except Channel where alien introduction fisheries more influential. We series alternative may affect webs. emphasizes benefits approach understand predict Southern Hemisphere ecosystems. provides holistic understanding ecosystems, which enhances our ability their interactions, offering management conservation face stressors.

Язык: Английский

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Effects of glacial melting on physiological performance of Macrocystis pyrifera in the Fjord of the Mountains, Magellanic Sub-Antarctic ecoregion, Chile

Journal of Applied Phycology, Год журнала: 2024, Номер unknown

Опубликована: Окт. 24, 2024

Язык: Английский

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Giant kelp recruitment declines and changes in understory algae in a sub-Antarctic urban ecosystem

Hydrobiologia, Год журнала: 2024, Номер 851(20), С. 4783 - 4802

Опубликована: Июнь 26, 2024

Язык: Английский

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Kinetic Modeling of Escherichia coli Removal Mechanisms in Faecal Sludge on Unplanted Sand-Drying Beds Using Moringa Oleifera as a Conditioner

Water Conservation Science and Engineering, Год журнала: 2024, Номер 9(2)

Опубликована: Авг. 21, 2024

Язык: Английский

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