Latitudinal and seasonal effects on short-term acclimation of floating kelp species from the South-East Pacific

Tala, Fadia; Velásquez, Marcel; Mansilla, Andrés; Macaya, Erasmo C.; Thiel, Martín

doi:10.1016/j.jembe.2016.06.003

Cited by 37 publications

(25 citation statements)

References 73 publications

(128 reference statements)

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“…Our data indicate that M. pyrifera and D. antarctica potentially traveled a distance of at least 2700 km, reaching the Brazilian coast, still alive. Such evidence confirms that Macrocystis can grow and keep its reproductive viability while drifting for long periods at latitudes around 27° S during winter [92]. This high immigration capacity was shown by our physiological data, which demonstrated that raft …”

Section: Discussionsupporting

confidence: 86%

“…The potential origin of these kelp rafts is more than 2000 km away, because the most likely and nearest well-documented occurrence, of both species, is the Falkland Islands [91]. The washed up plants, observed on the Uruguayan and Brazilian coasts showed that they have the physiological tools to acclimatize to the floating conditions in this area, during this period [92]. Despite a long drift process, the oceanographic and climatic conditions (cold water and reduced winter irradiance), observed during the end of the 2016 winter, could be responsible for the good physiological health of the M. pyrifera and D. antarctica rafts that washed up in Brazil [93].…”

Section: Discussionmentioning

confidence: 97%

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Kelps’ Long-Distance Dispersal: Role of Ecological/Oceanographic Processes and Implications to Marine Forest Conservation

et al. 2018

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Long-distance dispersal is one of the main drivers structuring the distribution of marine biodiversity. This study reports the first occurrence of Macrocystis pyrifera and Durvillaea antarctica rafts on the southwestern warm temperate coast of the Atlantic Ocean. Our results indicate that an extreme meteo-oceanographic event, characterized by a northward, displacement of cold sub-Antarctic oceanic waters driven by an extratropical cyclone, could account for these unusual occurrences. A niche model based on known current distribution and maximum entropy principle (MAXENT), revealed the availability of suitable habitats at lower latitudes, outside their actual distribution edges. The distributional boundaries, mainly driven by temperature and irradiance, suggest the existence of environmental suitability in warm temperate areas, as well as in the Northern Hemisphere off Atlantic and Asian coasts. These theoretical edges and respective environmental drivers agree with the physiological affinities of both species, supporting the hypothesis that these variables act as limiting factors for their occurrences in tropical or warmer areas. Emerging regions can function as Diversity 2018, 10, 11; doi:10.3390/d10010011 www.mdpi.com/journal/diversity Diversity 2018, 10, 11 2 of 25 refuges and stepping-stones, providing substrate with adequate habitat conditions for recruitment of propagules, allowing eventual colonization. Long dispersal events reinforce the need for an extensive discussion on selective management of natural dispersion, biological invasions, refuge mapping and conservation initiatives in a transnational perspective.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 97%

Kelps’ Long-Distance Dispersal: Role of Ecological/Oceanographic Processes and Implications to Marine Forest Conservation

et al. 2018

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“…Such ecotypes often develop due to strong environmental patterns, the most pervasive of which are temperature gradients in the marine intertidal realm (Cruces et al 2013). Along the Chilean coast, mean surface water temperatures range from around 18°C in the north to 6−8°C in the far south (Locarnini et al 2013), and within the region that we sampled, temperatures range from around 14°C (winter) to 19°C (summer) in the north to 12°C (winter) to 17°C (summer) in the south (Tala et al 2016). Such latitudinal temperature changes can present different physiological challenges for intertidal taxa (Tala et al 2016), and thus might also lead to geographic genetic variation in the host kelp.…”

Section: Temperature Effectsmentioning

confidence: 86%

“…We further hypothesised that infection prevalence would vary along latitudinal gradients, with the greatest infection prevalence toward the northern limits of the hosts' ranges, where kelps are most physiologically stressed (e.g. Tala et al 2016). We tested these hypotheses using ecological and genetic surveys of infected Durvillaea along the southern Australian and southern-central Chilean coasts.…”

Section: Introductionmentioning

confidence: 99%

Gall-forming protistan parasites infect southern bull kelp across the Southern Ocean, with prevalence increasing to the south

Blake¹,

Thiel²,

López³

et al. 2017

Mar. Ecol. Prog. Ser.

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“…, Tala et al. ). Grazing effects on raft persistence were only tested in outdoor mesocosms (Vandendriessche et al.…”

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confidence: 99%

High acclimation potential in floating Macrocystis pyrifera to abiotic conditions even under grazing pressure – a field study

Rothäusler

Reinwald

López

et al. 2018

Journal of Phycology

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The persistence of floating seaweeds, which depends on abiotic conditions but also herbivory, had previously been mostly tested in outdoor mesocosm experiments. In order to investigate if the obtained mesocosm results of high seaweed persistence under natural environmental conditions and under grazing pressure can be extrapolated to field situations, we conducted in situ experiments. During two summers (2007 and 2008), Macrocystis pyrifera was tethered (for 14 d) to lines in the presence and absence of the amphipod Peramphithoe femorata at three sites (Iquique, Coquimbo, Calfuco). We hypothesized that grazing damage and seaweed persistence vary among sites due to different abiotic factors. By incubating the sporophytes in mesh bags, we were either able to isolate (grazing) or exclude (control) amphipods. To test for a mesh bag artifact, a set of sporophytes was incubated without mesh bags (natural). Mesh bags used to exclude herbivores influenced sporophyte growth and physiological performance. The chlorophyll a (Chl a) content depended largely on grazers and grazed sporophytes grew less than natural and control sporophytes within the two summers. A decrease in Chl a content was found for the sites with the highest prevailing irradiances and temperatures, suggesting an efficient acclimation to these sea surface conditions. Our field‐based results of sporophyte acclimation ability even under grazing pressure widely align with previous mesocosm results. We conclude that M. pyrifera and other temperate floating seaweeds can function as long‐distance dispersal vectors even with hitchhiking mesoherbivores.

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Latitudinal and seasonal effects on short-term acclimation of floating kelp species from the South-East Pacific

Cited by 37 publications

References 73 publications

Kelps’ Long-Distance Dispersal: Role of Ecological/Oceanographic Processes and Implications to Marine Forest Conservation

Kelps’ Long-Distance Dispersal: Role of Ecological/Oceanographic Processes and Implications to Marine Forest Conservation

Gall-forming protistan parasites infect southern bull kelp across the Southern Ocean, with prevalence increasing to the south

High acclimation potential in floating Macrocystis pyrifera to abiotic conditions even under grazing pressure – a field study

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