Use of Biomass Units in Shannon's Formula

Spatial distribution and abundance of small fishes were studied in autumn 2007 in the Xiaosihai Lake, a shallow lake along the middle reach of the Changjiang (Yangtze) River. Based on the plant cover, the lake was divided into three major habitats: Myriophyllum spicatum habitat (MS habitat), Trapa bispinosa habitat (TB habitat), and non-vegetation habitat (NV habitat). A modified pop-net was used for quantitative sampling of small fishes in the three habitats, and the Zippin's removal method was used for estimating densities of the small fishes. A total of 13 species belonging to 5 families were collected, with 11 species in MS habitat, 7 species in TB habitat, and 5 species in NV habitat. Habitat type had significant effect on the spatial distribution of small fishes. The Shannon-Wiener diversity index in the MS, TB and NV habitats were 1.28, 0.56 and 0.54, respectively. The total density and biomass of small fishes were significantly higher in the MS habitat (13.68 ind/m 2 and 4.44 g/m 2 ) than in the TB habitat (1.41 ind/m 2 and 0.54 g/m 2 ) and the NV habitat (1.08 ind/m 2 and 0.40 g/m 2 ), and were not significantly different between the TB habitat and the NV habitat. Water depth had no significant effect on spatial distribution of the small fishes. It was suggested that vegetation type played an important role in habitat selectivity of small fishes, and the presence of submersed vegetation should be of significance in the conservation of small fish diversity.

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“…Shannon-Wiener's diversity index (H) was used to calculate fish diversity at each sampling site (Pielou, 1966;Wilhm, 1968):…”

Section: Data Collectionmentioning

confidence: 99%

Spatial distribution and abundance of small fishes in Xiaosihai Lake, a shallow lake along the Changjiang (Yangtze) River, China

Wei

Zhang

2010

Chin. J. Ocean. Limnol.

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“…Furthermore, importance can be rated by measures other than a count of individuals. It is therefore feasible to speak of diversity when the organisms are categorized by photosynthetic pigments (Margalef 1967(Margalef , 1968, cell size (Parsons 1969;Ruiz 1994), biomass (Lurie and Wagensberg 1983), or when the "importance" of the organisms is expressed as ash-free weight (Wilhm 1968) or as biovolume (Parsons 1969). In fact, if the emphasis of the research goal so requires, importance could presumably be expressed as energy flow, productivity, calorific values, respiratory gas exchange rate, and other measures of resource utilization (Tokeshi 1993).…”

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confidence: 99%

Cytometric diversity in marine ultraphytoplankton

1997

Limnology & Oceanography

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The concept and methods of ecological diversity in communities were applied to phytoplankton categorized by flow cytometric measurements related to size and chlorophyll content. Each cytometric signature was condensed to single numerical values indicative of diversity and evenness. Measurements pooled from studies disparate in temporal and spatial scales indicated greater chlorophyll biomass and primary production with greater cytometric diversity and evenness. Future development of these ideas may help link biological oceanographic processes with patterns established through ecological processes at the community level.

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“…Diversity values were obtained as described by Niell (1974 and in press a) and Niell & Rucabado (in press): dry weight values were taken as units and calculations were made using Shannon's formula (Wilhm, 1968). Himanthalia 0.60-0.90 semielongata exposed*** IV Himanthalia 0.40-0.60 exposed*':":" elongata V Himanthalia 0.30-0.60 more exposed elongata than IV*** * From Niell (in press).…”

Section: Methodsmentioning

confidence: 99%

Rocky intertidal benthic systems in temperate seas: A synthesis of their functional performances

Niell

1977

Helgolander Wiss. Meeresunters

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Species composition and values of diversity, biomass, quantities of chlorophyll a and carotenes of 5 algal communities, located at different intertidal levels in northwestern Spain, were studied at monthly intervals. Productivity and loss of matter, as well as the production/biomass ratio in the same communities, are related to environmental stress (e.g. emersion, high temperature) and used to explain the dynamics of the system. Dynamic performances are also related to seasonal changes of patterns of zonation and special micropatchiness. High productivity values (computed values between 0.50 and 2.71 g C m -~ day -z) are ascribed to extra-energy inputs (not due to illumination) in terms of waves, tides and other water movements. The importance of such extra energy for productivity is discussed. Extra-energy is more important at low levels; at high levels its role is substituted by the ability of plants to photosynthesize during emersion periods. High intertidal communities are resistent to stress and hence, "physically controlled"; in contrast, low-level communities are "biologically controlled". The former are more conservative, the latter less efficient. Based on all data obtained, a hypothesis is presented, regarding the general functioning of intertidal communities.

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Use of Biomass Units in Shannon's Formula

Abstract: Species diversity of a population of benthic macroinvertebrates was described with Shannon's formula. The index was compared with basic data as numbers of individuals versus basic data as biomass units.

Cited by 172 publications

References 5 publications

Spatial distribution and abundance of small fishes in Xiaosihai Lake, a shallow lake along the Changjiang (Yangtze) River, China

Spatial distribution and abundance of small fishes in Xiaosihai Lake, a shallow lake along the Changjiang (Yangtze) River, China

Cytometric diversity in marine ultraphytoplankton

Rocky intertidal benthic systems in temperate seas: A synthesis of their functional performances

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