Sporulation ofEnteromorpha spp. (Chlorophyta) and overwintering of spores in sediments of the Wadden Sea, Island Sylt, North Sea

Schories, Dirk

doi:10.1007/bf02084233

Cited by 46 publications

(27 citation statements)

References 21 publications

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“…Similarly, E. intestinalis germinate after 18 mo in darkness (Arasaki 1953), and germinated juveniles of Enteromorpha spp. survive 8 mo of darkness at 5°C (Schories 1995a). In Mondego Estuary, Portugal and in Tralebergskile, Sweden, Enteromorpha spp.…”

Section: Enteromorpha Spp Germlings On Hydrobia Sppmentioning

confidence: 99%

“…Stable substrata that remain at the illuminated sediment surface are essential for small propagules to germinate. Thus, although mud particles and sand grains are frequently-colonised by propagules settling from the water column (Schories 1995a, Schories et al 1997a, they represent unsuitable substrata because sediment layers are often reworked and surface particles are re-located to deeper (i.e. darker) layers.…”

Section: Introductionmentioning

confidence: 99%

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Flagging greens:hydrobiid snails as substrata for the development of green algal mats (Enteromorpha spp.) on tidal flats of North Atlantic coasts

Schories¹,

Aníbal²,

Chapman³

et al. 2000

Mar. Ecol. Prog. Ser.

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During the past 3 decades, dense mats of green algae (especially Enteromorpha spp.) have been recorded regularly from tidal flats worldwide. The development of green algal mats on tidal flats may be initiated by overwintering and regrowth of adult plants or by the formation and release of small propagules, i.e. vegetative fragments, zoospores and zygotes. On soft sediments, macroinvertebrates may constitute prime substrata for germination of algal spores. Hydrobud (mud-) snails are widespread along North Atlantic soft sediment shores and were identified previously as important substrata for Enteromorpha spp. germlings in 1 of our study areas. To test the generality of this phenomenon, we investigated the presence of Enteromorpha spp. gerrnlings attached to hydrobud snails from

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Section: Enteromorpha Spp Germlings On Hydrobia Sppmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flagging greens:hydrobiid snails as substrata for the development of green algal mats (Enteromorpha spp.) on tidal flats of North Atlantic coasts

Schories¹,

Aníbal²,

Chapman³

et al. 2000

Mar. Ecol. Prog. Ser.

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“…A first condition necessary for survival in the banks relates to the ability of these microscopic forms to tolerate darkness or dim light for extended periods. Propagules and microscopic forms of Laminariales and a few red and green algae have been found to be able to survive in darkness or in very dim light (Burrows 1958, Kain 1964, Neushul & Dahl 1964, Chapman & Burrows 1970, Lünning 1980, Schonbeck & Norton 1980, Hay & Norris 1984, Reed et al 1992, tom Dieck 1993, Leukart & Lünning 1994, Schories 1995. However, it is unknown whether this capacity is general to all types of microscopic forms of macroalgae.…”

Section: Introductionmentioning

confidence: 99%

Banks of microscopic forms and survival to darkness of propagules and microscopic stages of macroalgae

Santelices

Aedo

Hoffmann

2002

Rev. chil. hist. nat.

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Previous studies have found that the number of species conforming a bank of microscopic forms in tide pools in central Chile accounted only for half the number of species present in the macroscopic vegetation around the pools. An elemental condition for survival in these banks is the ability of microscopic forms to tolerate darkness or very low irradiances for extended periods. To test this ability, spores of 17 green, brown and red algal species, present and absent from the bank, were incubated at different combinations of irradiances and day lengths. Propagules of 47 % of the species tested (eight species) germinated in total darkness while the propagules of the other nine species germinated under conditions of very low irradiance (2-10 µmol m -2 s -1 ). In most species, microforms showed a higher tolerance to darkness than the propagules. Some survived for over a year and one species (Gelidium lingulatum) could live under complete darkness for 500 days. The ability to survive in total darkness did not relate to presence or absence of a species in the banks of microscopic forms previously studied, to phylogenetic relatedness, life history style, propagule size, morphology of microscopic forms or to successional status (fugitive versus late successional). Thus, tolerance to darkness appears to be common to propagules and microscopic stages of most benthic algae. The growth patterns exhibited by the microforms of Lessonia nigrescens, Chaetomorpha firma and Glossophora kunthii suggest high irradiances on these recruits might determine the shallower limits of distribution of these species.

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“…This process ensures the perpetuation of the population on return of an ambient environmental condition, annually. The regular occurrence of dense mat of filamentous green algae on the tidal flat of Koningshafen Bay (Island Sylt, North Sea, Federal Republic of Germany) was due to overwintering of adult plants or fragments 34 . Another factor for low diversity in monsoon months could be the strong current and wave action that dislodges the macroalgae from the substratum.…”

mentioning

confidence: 99%

Temporal Effect on the Abundance and Diversity of Intertidal Rocky Shore Macroalgae

Imchen¹,

Anil²

2017

Current Science

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A study of the temporal effect on the abundance and diversity of intertidal rocky shore macroalgae revealed that there are ~70 species in the intertidal rocky shore of Anjuna (60 species) and Vagator (52 species) in Goa, India. Results showed that premonsoon (May) and post-monsoon (December) seasons favoured high species richness and abundance in both the study sites. In both cases, species diversity was low during the monsoon months (July and August). The study showed that low diversity might be a monsoonal effect and it coincides with the growth of Ulva and Porphyra species. The growth of opportunistic annuals brings about an ephemeral dominance of the macroalgal community by annual macroalgae. The driver is believed to be the nutrient influx from surface run-off, change in salinity and temperature due to high precipitation. The study showed that monsoon could have a role on the macroalgal community dynamics, and there was a strong correlation between diversity and biomass.Keywords: Biomass, monsoon, microalgal abundance and diversity, nutrient run-off.THE intertidal rocky region, despite its barren appearance, is teeming with life and macroalgae are one of the main constituents. They form the basis of the trophic structure and support numerous associated faunas in the form of food and refuge. As a primary producer, their diversity and abundance have the ability to transform and determine the characteristics of the community structure in a rocky shore ecosystem. However, the habitat disturbance due to anthropogenic activities has been the major cause of biodiversity decline in the oceans, including intertidal rocky shore biodiversity 1 . Macroalgae are a dynamic community and exhibit a spatial and temporal variation in terms of species richness and composition. There is evidence of a latitudinal biodiversity gradient in the marine system, where areas of low and high species richness have been identified throughout the temperate and tropical waters 2 . Macroalgal numbers are, however, negatively correlated to elevation with fewer species in the higher zones 3 . The processes and the effect on the alteration of macroalgal biodiversity have been alluded to habitat destruction, disease, overexploitation 4 , population depletion and trophic cascade 5 , coral bleaching and macroalgal recovery 6 , habitat transformation and opportunist proliferation 7 , eutrophication 8 and grazing effect of the grazers 4,9,10 . The intertidal zone is also exposed to harsh conditions which cause sudden mortality, but they also increase diversity or reduce species diversity under certain circumstances 2,11 . Macroalgae play a major structural and functional role in several habitats ranging from turfs to kelp forest 10 . They are widely recognized ecosystem engineers 12 or foundation species 13 , and an important carbon sink 14 . So the changes in composition of the macroalgal community through habitat loss/modification or climate change will affect the ecosystem 10 . Macroalgal communities are also critical for the recruitment and pro...

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Sporulation ofEnteromorpha spp. (Chlorophyta) and overwintering of spores in sediments of the Wadden Sea, Island Sylt, North Sea

Cited by 46 publications

References 21 publications

Flagging greens:hydrobiid snails as substrata for the development of green algal mats (Enteromorpha spp.) on tidal flats of North Atlantic coasts

Flagging greens:hydrobiid snails as substrata for the development of green algal mats (Enteromorpha spp.) on tidal flats of North Atlantic coasts

Banks of microscopic forms and survival to darkness of propagules and microscopic stages of macroalgae

Temporal Effect on the Abundance and Diversity of Intertidal Rocky Shore Macroalgae

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