Floating period of Sargassacean thalli estimated by the change in density

Yatsuya, Kousuke

doi:10.1007/s10811-007-9293-1

Cited by 26 publications

(27 citation statements)

References 5 publications

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“…With the progressing season, the floating ability decreases (Yatsuya ) as receptacles release their gametes and die off, and old vesicles can get filled with water (Vandendriessche et al for F. vesiculosus ; Yatsuya for Sargassum ). Actually, abundances of floating Fucus were lowest during the autumn, which is likely the result from both the lack of receptacles and a reduced benthic biomass due to a removal of the deteriorated reproductive branches during late summer (Knight and Parke ; Berger et al ).…”

Section: Discussionmentioning

confidence: 99%

Abundance and dispersal trajectories of floating Fucus vesiculosus in the Northern Baltic Sea

Rothäusler

Corell

Jormalainen

2015

Limnology & Oceanography

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Floating macroalgae play a fundamental role for the connectivity of littoral marine habitats. They can be found throughout the world's oceans but information on their abundance and dispersal abilities is scarce. This information, however, is essential to evaluate their ecological role and the potential connectivity between populations of both the algae and associated biota. Here, we survey the abundance and spatiotemporal dispersal patterns of the floating brown alga Fucus vesiculosus in the Northern Baltic Sea. By incorporating a biophysical modeling approach, based on ocean circulation and surface winds, we demonstrate potential dispersal ranges, such as floating distances and directional trajectories of F. vesiculosus at different times of their reproductive season. Abundance of floating algae varied both spatially and temporally, with the highest densities being found during reproductive seasons. Evidenced by the fact that many algae were held back and accumulated in archipelagoes, the model suggests that a combination of local oceanographic features and seascapes strongly influences the dispersal of floating algae. However, a relatively high fraction of rafts spilled to more open sea areas, causing them to travel in multiple directions (e.g., Baltic Proper, Bothnian Bay, and Gulf of Finland) that are hundreds of kilometers away from their original sources, implying long-distance dispersal. We propose that the Northern Baltic Sea rocky littoral habitats are potentially well connected through abundant and long-reaching floating algae, with a chance to contribute to gene flow among F. vesiculosus populations.

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Section: Discussionmentioning

confidence: 99%

Abundance and dispersal trajectories of floating Fucus vesiculosus in the Northern Baltic Sea

Rothäusler

Corell

Jormalainen

2015

Limnology & Oceanography

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“…Our measured fluxes of Sargassum during the decay phase (up to 6 kg fresh weight m 22 ; Table 1) is a substantial amount of primary biomass, considering that these seaweed beds cover up to 110 km 2 of the Ningaloo lagoon (Kobryn et al 2013). When detached from the substratum in autumn-winter, this Sargassum biomass can take a number of pathways that include the formation of floating rafts, deposition of wrack onto intertidal habitats, and/or sinking wrack that can disperse throughout subtidal habitats (Duarte and Cebrian 1996;Yatsuya 2009;Stimson 2013). Such transport of seaweed biomass could provide substantial spatial subsidies of primary production to other parts of the system (Duarte and Cebrian 1996;Vanderklift and Wernberg 2008;Stimson 2013).…”

Section: Discussionmentioning

confidence: 99%

“…Such transport of seaweed biomass could provide substantial spatial subsidies of primary production to other parts of the system (Duarte and Cebrian 1996;Vanderklift and Wernberg 2008;Stimson 2013). Indeed, floating Sargassum rafts can persist for 4-14 weeks and travel considerable distances in that time (Yatsuya 2009), emphasizing the potential role that rafts could play in the transport of nutrients and primary productivity to biomes both internal and external to Ningaloo Reef.…”

Section: Discussionmentioning

confidence: 99%

Sea temperature shapes seasonal fluctuations in seaweed biomass within the Ningaloo coral reef ecosystem

Fulton

Depczynski

Holmes

et al. 2014

Limnology & Oceanography

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Environmental drivers of seaweed biomass were investigated at Ningaloo, Western Australia, a coral reef ecosystem with negligible anthropogenic influences on seaweeds from fishing, farming, or eutrophication. Periodic surveys of benthic macroalgae occupying seaweed-dominated beds within the lagoon at two locations (Coral Bay, Tantabiddi) were made during winter, spring, and late summer over a 26 month period. Canopyforming Sargassum spp. biomass fluctuated over a seasonal growth-decay cycle, with highest values in the warm summer months (up to 1013 g fresh weight 0.25 m 22 at Coral Bay) and lowest values in winter (down to 155 g fresh weight 0.25 m 22 at Tantabiddi). Conversely, prominent understory seaweed genera Dictyopteris and Lobophora reached peak biomass in winter, when the Sargassum spp. canopy was lowest. Sargassum spp. biomass variation could be attributed largely to time (52%), location (21%), and site (26%), with low variation within individual seaweed beds (1%). Statistical analysis of the influence of five environmental variables (temperature, light, wind-driven upwelling, rainfall, significant wave height) indicated that location and sea temperature (1 month antecedent to biomass) provided the best explanation for Sargassum spp. biomass fluctuations. While sea temperature is a key driver of seaweed temporal dynamics, heterogeneity at the kilometer scale suggests that spatial context is also important. Given the important role of seaweeds in many ecosystem processes, this strong biophysical coupling between Sargassum spp. biomass and sea temperature suggests that thermal climate change will significantly affect coral reef productivity and biodiversity.

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“…Elevated primary and secondary production, likely due to nutrients from terrigenous and marine sediments, may have both created a suitable feeding environment for banded goby juveniles. Furthermore, the vegetation was exclusively dominated by Sargassum horneri , which is an annual seaweed with a long floating period from January to May [39] and a high rate of growth at 10 mm d -1 [40]. The tsunami in March 2011 should have provided an ideal opportunity for this alga to prevail and, thus, copious habitat for banded goby.…”

Section: Discussionmentioning

confidence: 99%

Recovery of Coastal Fauna after the 2011 Tsunami in Japan as Determined by Bimonthly Underwater Visual Censuses Conducted over Five Years

Masuda¹,

Hatakeyama²,

Yokoyama³

et al. 2016

PLoS ONE

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Massive tsunamis induce catastrophic disturbance in marine ecosystems, yet they can provide unique opportunities to observe the process of regeneration. Here, we report the recovery of fauna after the 2011 tsunami in northeast Japan based on underwater visual censuses performed every two months over five years. Both total fish abundance and species richness increased from the first to the second year after the tsunami followed by stabilization in the following years. Short-lived fish, such as the banded goby Pterogobius elapoides, were relatively abundant in the first two years, whereas long-lived species, such as the black rockfish Sebastes cheni, increased in the latter half of the survey period. Tropical fish species were recorded only in the second and third years after the tsunami. The body size of long-lived fish increased during the survey period resulting in a gradual increase of total fish biomass. The recovery of fish assemblages was slow at one site located in the inner bay, where the impact of the tsunami was the strongest. Apart from fish, blooms of the moon jellyfish Aurelia sp. occurred only in the first two years after the tsunami, whereas the abundances of sea cucumber Apostichopus japonicus and abalone Haliotis discus hannai increased after the second year. Although we lack quantitative data prior to the tsunami, we conclude that it takes approximately three years for coastal reef fish assemblages to recover from a heavy disturbance such as a tsunami and that the recovery is dependent on species-specific life span and habitat.

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Floating period of Sargassacean thalli estimated by the change in density

Cited by 26 publications

References 5 publications

Abundance and dispersal trajectories of floating Fucus vesiculosus in the Northern Baltic Sea

Abundance and dispersal trajectories of floating Fucus vesiculosus in the Northern Baltic Sea

Sea temperature shapes seasonal fluctuations in seaweed biomass within the Ningaloo coral reef ecosystem

Recovery of Coastal Fauna after the 2011 Tsunami in Japan as Determined by Bimonthly Underwater Visual Censuses Conducted over Five Years

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