Recent Algal Stromatolites from the Canary Islands

McMaster, Robert L.; Conover, Jennifer

doi:10.1086/627198

Cited by 35 publications

(11 citation statements)

References 2 publications

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“…An examination of the depth distribution of both confirmed and unconfirmed records shows that the majority of the unconfirmed records are from deeper water than the confirmed records ( Figure 2). Although deep water rhodoliths are known worldwide (Bosence, 1983), with the maximum depth of rhodolith growth in the Canary Islands being 60-70 m (McMaster and Conover, 1966), the maximum depth of maerl in Ireland has been quoted as 32 m (Briand, 1991), whilst maerl gravel occurs up to 44 m depth in Scapa Flow, Orkney (D. Donnan, personal communication). Thus the exact sedimentary nature of these records must await confirmation, but they are included in the present compilation because of their potentially high conservation value.…”

Section: Discussionmentioning

confidence: 99%

A census of maerl beds in Irish waters

Grave

Whitaker

1999

Aquatic Conserv: Mar. Freshw. Ecosyst.

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1. Records of maerl beds in Irish waters were compiled from the following sources: Admiralty Charts, published/unpublished ecological/geological accounts, and personal communications/observations. 2. Geographic and depth distributions of maerl records in Irish waters are discussed. Two main areas, Galway Bay–Connemara and South West Ireland, were identified as harbouring the highest concentrations of confirmed records, with maximum depth of confirmed records being approximately 25–30 m. 3. Deposits shown as ‘crl’ markings on older Admiralty Charts may refer to maerl and are situated at greater depths (to 95 m) and are further offshore than confirmed deposits (to 32 m), the latter being based on more recent observations. 4. Although the precise number of maerl beds in Irish waters cannot be assessed from the available records, the minimum number of larger beds (>1 km2), based on confirmed records only, is 35–40 beds located in 18 areas. In addition, along the south‐west coastline numerous smaller spatial aggregations (as small as 1–5 m2) occur. Copyright © 1999 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 99%

A census of maerl beds in Irish waters

Grave

Whitaker

1999

Aquatic Conserv: Mar. Freshw. Ecosyst.

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“…The forereef rhodoliths are common on deep forereef to shelf margins or on the banks and seamounts of tropical reef regions that are below the depths at which abundant corals can survive. These rhodoliths: (i) are pebble-to cobble-sized and spheroidal to ellipsoidal in shape, associated with less abundant irregularly shaped forms; (ii) are composed of multispecific nongeniculate coralline algae and several individuals of one (to a few) species of encrusting foraminifer(s); and (iii) consist of coralline algae, the thalli of which are mainly encrusting to warty to lumpy forms (McMaster & Conover 1966;Focke & Gebelein 1978;Montaggioni 1979;Rezak et al 1985;Reid & MacIntyre 1988;Prager & Ginsburg 1989;Minnery 1990;Littler et al 1991;Tsuji 1993;Iryu et al 1995;Bassi et al 2008). The rhodoliths recovered from the older Pleistocene sequence in Tahiti are analogous to modern forereef rhodoliths with regard to their shape, internal structure, and composition.…”

Section: Nongeniculate Coralline Algae As Depth Indicatorsmentioning

confidence: 99%

Sealevel history recorded in the Pleistocene carbonate sequence in IODP Hole 310‐M0005D, off Tahiti

et al. 2010

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Material cored during the Integrated Ocean Drilling Program (IODP) Expedition 310 'Tahiti Sea Level' revealed that the fossil reef systems around Tahiti are composed of two major stratigraphic sequences: (i) a last deglacial sequence; and (ii) an older Pleistocene sequence. The older Pleistocene carbonate sequence is composed of reef deposits associated with volcaniclastic sediments and was preserved in Hole 310-M0005D drilled off Maraa. Within an approximately 70-m-thick older Pleistocene sequence (33.22-101.93 m below seafloor; 92.85-161.56 m below present sealevel) in this hole, 11 depositional units are defined by lithological changes, sedimentological features, and paleontological characteristics and are numbered sequentially from the top of the hole downward (Subunits P1-P11). Paleowater depths inferred from nongeniculate coralline algae, combined with those determined by using corals and larger foraminifers, suggest two major sealevel rises during the deposition of the older Pleistocene sequence. Of these, the second sealevel rise is associated with an intervening sealevel drop. It is likely that the second sealevel rise corresponds to that during Termination II (TII, the penultimate deglaciation, from Marine Isotope Stages 6 to 5e). Therefore, the intervening sealevel drop can be correlated with that known as the 'sealevel reversal' during TII. Because there are limited data on the Pleistocene reef systems in the tropical South Pacific Ocean, this study provides important information about Pleistocene sealevel history, the evolution of coral reef ecosystems, and the responses of coral reefs to Quaternary climate changes.

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“…As studied by Gebelein (1969) at Bermuda, these structures are now forming in about 1-8 m of water. However, they (and the related rhodolites of red algal origin) are known to occur at much greater depths (McMaster & Conover, 1966;Bosellini & Ginsburg, 1971) down to 100 m. It is uncertain whether sand-movements at this depth provide the conditions for their overturning and consequent growth, or whether the water has deepened and they are a 'drowned' occurrence (both could of course occur). I concluded on the basis of evidence then available (Elliott, 1966) that the Oman oncolites formed below low tide level (say 2-3 m).…”

Section: Fossil Representatives: Recognition Of Former Environmentsmentioning

confidence: 99%

Ecologic significance of post-Palaeozoic green calcareous algae

Elliott

1978

Geol. Mag.

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The palaeoecologic significance of post-Palaeozoic green calcareous algae is evaluated with what is known of the environments of comparable living algae. Here requirements and tolerances of temperature, bottom sediment, salinity and water-energy may be observed; depth is apparently significant only as it influences these. In the extinct algae, only a minority show clear taxonomic relationship to living algae, in palaeo-environments deduced from independent evidence. Codiaceae and Dasycladales seem to have had environmental preferences like their living descendants, with preferred microenvironments in some genera.

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Recent Algal Stromatolites from the Canary Islands

Cited by 35 publications

References 2 publications

A census of maerl beds in Irish waters

A census of maerl beds in Irish waters

Sealevel history recorded in the Pleistocene carbonate sequence in IODP Hole 310‐M0005D, off Tahiti

Ecologic significance of post-Palaeozoic green calcareous algae

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