70 research outputs found
Application of LANDSAT to the surveillance of lake eutrophication in the Great Lakes basin
The author has identified the following significant results. A step-by-step procedure for establishing and monitoring the trophic status of inland lakes with the use of LANDSAT data, surface sampling, laboratory analysis, and aerial observations were demonstrated. The biomass was related to chlorophyll-a concentrations, water clarity, and trophic state. A procedure was developed for using surface sampling, LANDSAT data, and linear regression equations to produce a color-coded image of large lakes showing the distribution and concentrations of water quality parameters, causing eutrophication as well as parameters which indicate its effects. Cover categories readily derived from LANDSAT were those for which loading rates were available and were known to have major effects on the quality and quantity of runoff and lake eutrophication. Urban, barren land, cropland, grassland, forest, wetlands, and water were included
Non-geniculate coralline algae (Carallinales, Rhodophyta) on Heron Reef, Great Barrier Reef (Australia)
This is the first modern, comprehensive account of non-geniculate coralline algae (Corallinales, Rhodophyta) occurring on the Great Barrier Reef (Heron Reef). Species were identified in a modern context, using reproductive and vegetative anatomy as diagnostic features. In a collection of 300 specimens, 11 different species were identified. Eight of the species were found exclusively on calcareous substrata, one was exclusively epiphytic, while the remaining two were both epiphytic and found growing on calcareous substrata. Although none of the species are new to science, one is newly recorded for Australia (Hydrolithon reinboldii) and 5 are newly recorded for the Great Barrier Reef region (Spongites fruticulosus, Lithophyllum frondosum, L. pustulatum, Mastophora pacifica and Mesophyllum erubescens). Collections made by A. B. Cribb in the 1960s on Heron Reef were also studied, once again using reproductive and vegetative anatomy as diagnostic features. Illustrations of each species and a tabular key are provided to facilitate non-geniculate coralline algal identification on Heron Reef. Information on their distribution and growth-forms are provided along with references to more detailed morphological accounts and published illustrations. The reported species are compared to findings from other tropical reef systems
Rhodolith bed structure along a depth gradient on the northern coast of bahia state, brazil
Abundance and species composition of non-geniculate coralline red algae epiphytic on the South African populations of the rocky shore seagrass Thalassodendron leptocaule M.C. Duarte, Bandeira & Romeiras
Seagrasses support a great diversity of epiphytic organisms and new research has
shown that non-geniculate coralline red algae are important occupiers of space on
the fronds of seagrasses. Except for a few scant records, there are no detailed
published accounts of non-geniculate coralline algae epiphytic on seagrasses in South
Africa. The seagrass Thalassodendron leptocaule (previously known as
Thalassodendron ciliatum) is unique among southern African seagrasses in that it
occurs on exposed rocky outcrops along the Mozambique and north eastern South
African coast; most other seagrasses are restricted to sheltered bays and estuaries.
Here we present descriptions of three species of non-geniculate coralline red algae
which we have identified growing epiphytically on this seagrass in northern
KwaZulu-Natal: Hydrolithon farinosum, Pneophyllum amplexifrons and
Synarthrophyton patena. Two of the corallines (P. amplexifrons and S. patena) were
restricted to the seagrass' stems while the third (H. farinosum) occurred only on the
leaves. Of the three coralline epiphytes, P. amplexifrons contributed most to the
biomass (average wet weight per plant 0.6±1.18 g); its wet weight, however, varied
between habitats. Hydrolithon farinosum and other smaller turf algae amounted to
no more than 0.1 g (wet weight) per leaf. Synarthrophyton patena was far more
sparsely evident and contributed to less than 0.1 g (wet weight) per stem.
Pneophyllum amplexifrons and H. farinosum appear to be pioneer epiphytes and
form additional surfaces onto which other seaweed epiphytes attach and grow.
Distribution of these epiphytes is explained by the longevity of the stems and leaves
of the seagrass.Web of Scienc
Leptophytum (Corallinaceae, Rhodophyta): To be or not to be?—That is the question, but what is the answer?
Typification and reassessment of seventeen species of coralline red algae (Corallinales and Sporolithales, Rhodophyta) described by W. Ishijima during 1954–1978
The type specimens of 17 species of non-geniculate coralline red algae belonging to the Corallinales and Sporolithales (Corallinophycidae, Rhodophyta) and established from 1954–1978 by Wataru Ishijima have been re-examined, focusing on characters relevant to modern coralline taxonomy. The species are from the Early Cretaceous, Eocene, Oligocene, Miocene and Pleistocene rocks of southern and central Japan, Indonesia, Malaysia, Indian Ocean, Philippines, Pakistan and Galapagos and were attributed by Ishijima to Lithothamnion (as Lithothamnium), Mesophyllum, Lithophyllum and Archaeolithothamnion (as Archaeolithothamnium). With two exceptions, all species had to be reassigned to different genera or were of uncertain generic placement within particular subfamilies, families or orders. The type specimen of Lithophyllum oboraensis is retained in Lithophyllum and the type specimen of Mesophyllum izuensis is retained in Mesophyllum. The type specimens of Lithophyllum izuensis (Ishijima) comb nov. (= Lithothamnion izuensis), Phymatolithon tokumanensis (Ishijima) comb. nov. (= Mesophyllum tokumanensis), Sporolithon borneoensis (Ishijima) comb. nov. (= Archaeolithothamnium borneoense) and Sporolithon galapagosensis (Ishijima) comb. nov. (= Archaeolithothamnion galapagosensis) possess features justifying their assignment to various genera within a particular family and subfamily. A specimen ascribed by Ishijima to Archaeolithothamnion galapagosensis (as Archaeolithothamnium) in the protologue of that species is a misidentified specimen of Sporolithon ptychoides Heydrich. The type specimens of Lithophyllum minoensis and Mesophyllum indicum belong to the Corallinaceae, subfamily Mastophoroideae but are of uncertain generic placement. The type specimens of Lithothamnion makinogoensis, Lithothamnion nodai, Lithothamnion tenuicrustatum, Mesophyllum niinoi and Mesophyllum yuyashimaensis belong to the Hapalidiaceae (Melobesioideae) but are of uncertain generic placement. The type specimens of Lithophyllum hashimotoi, Lithophyllum minae, Lithothamnion huseinii and Lithothamnion tokiensis lacked sufficient data to allow for order, family, subfamily or genus placement within the Corallinophycidae. Lectotype specimens have been designated as necessary, and relevant historical, repository, geological, morphological and other data are presented in the taxonomic accounts and concluding remarks
Reef‐building coralline algae from the Southwest Atlantic: filling gaps with the recognition of Harveylithon
Morphology, anatomy and reproduction of the eastern Mediterranean coralline Tenarea tortuosa and its relationship to members of the Lithophylloideae and Mastophoroideae (Rhodophyta, Corallinales)
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