Seaweed assemblage changes in the eastern Cantabrian Sea and their potential relationship to climate change

Díez, I.; Muguerza, N.; Santolaria, Alberto; Ganzedo, Unai; Gorostiaga, J.M.

doi:10.1016/j.ecss.2011.12.027

Cited by 138 publications

(84 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is supported by other studies conducted along the northern coast of Spain, east of our study area (Fernandez, 2011;Diez et al, 2012). Also Tuya et al (2012) express their concerns on kelp retreat in northerly direction along the coast of Portugal.…”

Section: Discussionsupporting

confidence: 89%

“…Also an increase in abundance of the exotic alga Asparagopsis armata was suggested in this study . This is supported by Diez et al (2012), who found a spread of A. armata along the Western Basque coast, east of Asturias, over the past two decades, particularly in areas where canopy forming algae were missing. Disturbance of native seaweed canopy is an important contributing factor to the establishment of invasive algae (Valentine et al, 2007), and the loss of kelp may have facilitated the spread of invasive macrophytes.…”

mentioning

confidence: 60%

“…A loss in diversity of kelp associated fauna can be reduced when neighboring habitats were proximate (Goodsell and Connell, 2002). However, a decline of S. polyschides has already been observed east of Cape Penas (Fernandez, 2011;Diez et al, 2012). Thereby it should be noted that S. polyschides is an annual kelp species, in contrast to the perennial L. ochroleuca, which may influence faunal composition (Christie et al, 2009).…”

Section: Consequences Of the Kelp Declinementioning

confidence: 99%

See 2 more Smart Citations

Climate driven changes in subtidal kelp forest communities in NW Spain

Voerman

Llera²,

Rico

2013

Marine Environmental Research

110

View full text Add to dashboard Cite

a b s t r a c tReconstructions suggest a massive decline of nearly 1400 ha of kelp forest in North Western Spain in 2007. In line with global rising temperatures, we hypothesized that Sea Surface Temperature (SST) surpassed a lethal threshold for kelp. We examined whether changes in SST correlated to the proposed decline in kelp forest. All investigated SST characteristics suggested to affect kelp abundance increased significantly during the past thirty years, reaching extreme values during the last decade. In addition over the past two decades, the landscape formerly dominated by both cold and warm temperate canopy forming and understory species changed to one dominated by warm temperate understory species, resulting in a loss of vertical community structure. Fisheries landing data of kelp associated species was used to support the suggested change in kelp abundance. Subsequent recovery of the kelp appears to be occurring in deeper waters.

show abstract

Section: Discussionsupporting

confidence: 89%

mentioning

confidence: 60%

Section: Consequences Of the Kelp Declinementioning

confidence: 99%

See 1 more Smart Citation

Climate driven changes in subtidal kelp forest communities in NW Spain

Voerman

Llera²,

Rico

2013

Marine Environmental Research

110

View full text Add to dashboard Cite

show abstract

“…Lately, global warming has been accelerating a regional decline of the kelps M. pyrifera off the east coast of Tasmania (Johnson et al 2011), Laminaria ochroleuca and Saccorhiza polyschides in the southeastern part of the Bay of Biscay (Díez et al 2012), S. japonica and Costaria costata off the northern Honshu, Japan (Kirihara et al 2006), and Laminaria hyperborean along the Iberian Peninsula (Müller et al 2009). Around Japan, the recent increase in water temperature and decrease in nutrient concentration (Levitus et al 2001;Ono et al 2002;Watanabe et al 2005;Tanaka et al 2012) may have a negative impact on the production of kelp beds.…”

Section: -2 Range Extensionmentioning

confidence: 99%

Population Dynamics of Edible Sea Urchins Associated with Variability of Seaweed Beds in Northern Japan

Agatsuma¹

2014

Aqua-BioSci. Monogr. (ABSM)

View full text Add to dashboard Cite

Keyword Clements Tsukidate 1992). Sargassum beds trap nutrients and contribute to high rates of primary production (e.g. Wanders 1976). The highest annual production of 8.25 kg dry/m 2 was recorded in Sargassum macrocarpum in Iida Bay, Ishikawa in the Sea of Japan (Taniguchi and Yamada 1978).Edible sea urchins are primary consumers in coastal rocky-bottom ecosystems and their main diet is marine algae (De Ridder and Lawrence 1982). About 20 species of sea urchins are consumed in the world. Most sea urchins belong to the order Echinoida. All the species inhabit shallow waters (Lawrence 2001). Since Abstract Effects of variability of seaweed beds on population dynamics of sea urchins have not been studied in detail. The present study documents that population dynamics of edible sea urchins is closely associated with variability of seaweed beds in subtidal rocky regions in northern Japan, from larval settlement, gonad production, somatic growth, recruitment and seasonal migration of the sea urchins Mesocentrotus nudus, Strongylocentrotus intermedius and Hemicentrotus pulcherrimus. Dibromomethane (DBM), which is produced abundantly by crustose coralline algae, induced larval metamorphosis of more than 80% of individuals of M. nudus and S. intermedius in the presence of 34-61 ppm within 24 h, indicating its instantaneous effect on a high success of metamorphosis. Conversely, 2,4-dibromophenol (DBP) and 2,4,6-tribromophenol (TBP), which are released from kelps Eisenia bicyclis and Ecklonia kurome, killed all eightarmed larvae of M. nudus and S. intermedius in the presence of 20-50 ppm. The larval metamorphosis were significantly reduced in the presence of 1-10 ppm. These suggest that the population size of these sea urchins is enhanced on coralline barrens and reduced in kelp forests. Population size of M. nudus was enhanced by episodic recruitment of juveniles on crustose coralline barrens affected by large-scale oceanographic processes. Growth and gonad production of M. nudus and H. pulcherrimus is greatly affected by the amount and the kind of seaweed beds, which alter the states of crustose coralline flats and large perennial kelp or fucoid forests in the course of algal succession through oceanographic condition. The sea urchins migrate to seaweed beds to increase in gonad size toward maturation and spawning in the species-specific reproductive cycles to succeed in reproduction. Release of hatchery-raised seeds of S. intermedius into the wild and aquaculture of wild or hatchery-raised sea urchins fed on surplus or low-priced sea foods for humans enabled the sea urchins to increase the population size and improve the gonad production and somatic growth.

show abstract

“…In recent years, it became evident that kelp forest ecosystems along the European coastlines and worldwide are still under pressure and negatively impacted by global warming (e.g. Wernberg et al, 2010;Díez et al, 2012;Voerman et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Predicting spatial kelp abundance in shallow coastal waters using the acoustic ground discrimination system RoxAnn

Mielck

Bartsch

Hass

et al. 2014

Estuarine, Coastal and Shelf Science

View full text Add to dashboard Cite

a b s t r a c tKelp forests represent a major habitat type in coastal waters worldwide and their structure and distribution is predicted to change due to global warming. Despite their ecological and economical importance, there is still a lack of reliable spatial information on their abundance and distribution. In recent years, various hydroacoustic mapping techniques for sublittoral environments evolved. However, in turbid coastal waters, such as off the island of Helgoland (Germany, North Sea), the kelp vegetation is present in shallow water depths normally excluded from hydroacoustic surveys. In this study, single beam survey data consisting of the two seafloor parameters roughness and hardness were obtained with RoxAnn from water depth between 2 and 18 m. Our primary aim was to reliably detect the kelp forest habitat with different densities and distinguish it from other vegetated zones. Five habitat classes were identified using underwater-video and were applied for classification of acoustic signatures. Subsequently, spatial prediction maps were produced via two classification approaches: Linear discriminant analysis (LDA) and manual classification routine (MC). LDA was able to distinguish dense kelp forest from other habitats (i.e. mixed seaweed vegetation, sand, and barren bedrock), but no variances in kelp density. In contrast, MC also provided information on medium dense kelp distribution which is characterized by intermediate roughness and hardness values evoked by reduced kelp abundances. The prediction maps reach accordance levels of 62% (LDA) and 68% (MC). The presence of vegetation (kelp and mixed seaweed vegetation) was determined with higher prediction abilities of 75% (LDA) and 76% (MC). Since the different habitat classes reveal acoustic signatures that strongly overlap, the manual classification method was more appropriate for separating different kelp forest densities and low-lying vegetation. It became evident that the occurrence of kelp in this area is not simply linked to water depth. Moreover, this study shows that the two seafloor parameters collected with RoxAnn are suitable indicators for the discrimination of different densely vegetated seafloor habitats in shallow environments.

show abstract

Seaweed assemblage changes in the eastern Cantabrian Sea and their potential relationship to climate change

Cited by 138 publications

References 50 publications

Climate driven changes in subtidal kelp forest communities in NW Spain

Climate driven changes in subtidal kelp forest communities in NW Spain

Population Dynamics of Edible Sea Urchins Associated with Variability of Seaweed Beds in Northern Japan

Predicting spatial kelp abundance in shallow coastal waters using the acoustic ground discrimination system RoxAnn

Contact Info

Product

Resources

About