Protein Taxonomy of Aquatic Oligochaetes and Its Ecological Applications

Milbrink, Göran; Nyman, Lennart

doi:10.2307/3543825

Cited by 5 publications

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“…Between 55 and 90%, in fact, were in the top 2 cm. This pattern is consistent with those observed in many temperate lakes (Cole 1953, Milbrink 1973.…”

Section: Vertical Distributionsupporting

confidence: 92%

Limnology of tundra ponds, Barrow, Alaska

Hobbie¹

1980

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Bac terivorous Ciliates 0.2 mg C Zoof lagellates 35 mg C T 0.05 mg C T Bac teria 1500 mg C 15 mg C '-'0.5 mg C Algivorous Ciliates 1 mg C 0.15 mg C Algae 700 mg C MicromeCazoa 35 mg Cto work on areas of research that were still poorly-understood: (T.Fenchel, protozoan ecology; D. Kangas, zooplankton respiration; S. Dodson, invertebrate predation.) The summer of 1974 was spent in preparing reports. Modus OperandiTo reach the goals of the project we first used traditional limnological techniques to identify and measure the important pathways of carbon and energy flow in the tundra ponds. Next, the modeling was begun and used both to plan future experimental research on the processes and to evaluate the importance of proposed research. The philosophy we have followed in modeling is as follows:The Barrow soils have a strong thermal gradient during summer when the surface may reach 25°C while at the same time the horizons at 20 or 30 cm are below 2''C. This surface warming dries out the surface layers but the lack of drainage keeps the soil moisture contents at depths below 4 cm at greater than 85% of water-holding capacity. Consequently, vascular plants rarely lack moisture. On the other hand, the abundant moisture combined with low pore volume in mineral layers causes the deeper horizons to become anaerobic early in the summer.Chemically, most of the soils are highly organic, strongly acid, and not very fertile (Bunnell et al. 1975). Apparently, the base nutrients are usually sufficient for plant needs; N and P, although stored in large quantities, are released only slowly from the organic matter. Primary ProducersPlant production in the Barrow tundra has been extensively studied for many years; the data and results are reviewed in Bunnell et al. (1975), Tieszen (1978a), and Brown et. al. (in press).In summer, the coastal tundra vegetation resembles a yellow-brown grassland, relieved only by strips of greener vegetation in troughs between polygons or at the edges of ponds. The yellow-brown color results from the large accumulation of dead plant parts of grasses and sedges. All plants are short ( 1 to 1 5 cm high) and many have broad, flat stems.Compared with most ecosystems, the Barrow tundra is indeed uniform. Although there are 100 species of vascular plants (plus 96 bryophyte and 57 lichen species), the low relief of the coastal region produces only small environmental differences between lowlands and uplands. The result is that all species of the extensive marshes also occur on the uplands and most of the species of the driest upland sites are also found whenever hummocks appear in the wetter areas (Bunnell et al. 1975). Webber (1978) has divided this continuum of vegetation at the IBP site into eight plant assemblages. Five of these cover 9 1 % of the area. They are: mesic Salix rotundifolia heath in dry, low-center polygons (7%); mesic Carex aquatilis/Poa arctica meadow on dry, flat, polygonized areas Unlike the situation in many tundra areas, at Barrow the vertebrates consume few lichens. Lemming stomachs, ...

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“…Between 55 and 90%, in fact, were in the top 2 cm. This pattern is consistent with those observed in many temperate lakes (Cole 1953, Milbrink 1973.…”

Section: Vertical Distributionsupporting

confidence: 92%

Limnology of tundra ponds, Barrow, Alaska

Hobbie¹

1980

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“…electrophoretic) techniques to identify members of the aquatic Oligochaeta (Milbrink, 1973;Milbrink & Nyman, 1973;Anlauf, 1989) have been conducted in Europe. Nothing is known about allozymic variation in aquatic oligochaete species from North America.…”

Section: Introductionmentioning

confidence: 99%

Allozymic variation in tubificid oligochaetes from the Laurentian Great Lakes

Weider

1992

Hydrobiologia

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Aquatic oligochaetes are an important component of the benthos in many freshwater habitats. Yet, virtually nothing is known about the population genetics of this group. Electrophoretic surveys of allozymic variation of selected members of the Family Tubificidae were conducted at six locations in the Laurentian Great Lakes of North America. Branchiura sowerbyi was the dominant member of the oligochaete fauna at two sites, and was found to be monomorphic at all enzyme loci that were examined. In contrast, members of the genus Limnodrilus, which included L. cervix, L. claparedianus, L. hofmeisteri, L. maumeensis, and L. udekemianus showed considerable allozymic variation at several enzyme loci. L. udekemianus exhibited tri-and tetra-allelic heterozygous electromorph banding patterns at the monomeric Pgm locus, along with 'unbalanced' heterozygous patterns at both Pgm and the dimeric Pgi locus.Genetic distance analyses suggest that L. cervix, L. claparedianus, and L. maumeensis are closelyrelated (genetic identifies ranged from 0.92-0X5), and may represent subspecies rather than distinct species. Breeding studies need to confirm this assertion. This survey represents the first attempt to characterize allozymic variation of aquatic oligochaetes in North America. Additional work should focus on elucidating taxonomic ambiguities within this group via both morphological and biochemical genetic studies.

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The Aquatic Oligochaeta of the St. Lawrence Great Lakes Region

Spencer

1980

Aquatic Oligochaete Biology

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Protein Taxonomy of Aquatic Oligochaetes and Its Ecological Applications

Cited by 5 publications

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Limnology of tundra ponds, Barrow, Alaska

Limnology of tundra ponds, Barrow, Alaska

Allozymic variation in tubificid oligochaetes from the Laurentian Great Lakes

The Aquatic Oligochaeta of the St. Lawrence Great Lakes Region

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