Using indicator species to assess the state of macrobenthic communities

2003 ◽  
pp. 299-309 ◽  
Author(s):  
Silvana Bustos-Baez ◽  
Chris Frid
Keyword(s):  
Indicator Species ◽  
The State ◽  
Macrobenthic Communities

Using indicator species to assess the state of macrobenthic communities

Hydrobiologia ◽  
2003 ◽  
Vol 496 (1-3) ◽  
pp. 299-309 ◽  
Author(s):  
Silvana Bustos-Baez ◽  
Chris Frid
Keyword(s):  
Indicator Species ◽  
The State ◽  
Macrobenthic Communities

Predictor sets and biodiversity assessment: the evolution and application of an idea

2013 ◽  
Vol 19 (4) ◽  
pp. 418 ◽  
Author(s):  
R L Kitching ◽  
L A Ashton
Keyword(s):  
Indicator Species ◽  
Temporal Distribution ◽  
Single Species ◽  
The State ◽  
Future Research ◽  
Conservation Value ◽  
Biodiversity Assessment ◽  
Nineteen Nineties ◽  
Umbrella Species ◽  
Research Questions

The idea of “indicator species” is a relatively old one with a huge associated literature. The idea that the existence or health of a single species somehow captures the state of an entire ecosystem, though, remains a challenge to those who, like us, study entire assemblages of invertebrates. This challenge is especially marked when the ecosystems of choice are rainforests. Nevertheless there remains a need for a measure of diversity somewhere between the single species and the entire assemblage, which, for invertebrates in rainforests, may add up to many hundreds of species. This need led one of us (RK), in the nineteen nineties, to formulate the idea of a ‘predictor set’: that is, a statistically defined set of species, from within a much larger assemblage, whose spatial or temporal distribution captures the patterns characteristic of the entire assemblage. This essay will trace the origin and development of this idea and present some current applications and future research questions. Of course, the use of single charismatic species as “flagship” or “umbrella” species is undoubtedly of conservation value and remains unchallenged.

scholarly journals Pyrenocarpous lichens in Goa with five new records to India

2021 ◽  
Vol 8 (4) ◽  
Author(s):  
Pallavi Randive ◽  
Gaurav Kumar Mishra ◽  
Sanjeeva Nayaka ◽  
Dalip Kumar Upreti ◽  
M.K. Janarthanam
Keyword(s):  
Environmental Monitoring ◽  
Tropical Forests ◽  
Indicator Species ◽  
New Records ◽  
The State ◽  
Key Indicator ◽  
Pyrenocarpous Lichens ◽  
Lichen Biota ◽  
The Family ◽  
The One

The pyrenocarpous lichens are the one which produces perithecial ascocarps. They are one of the prominent groups of lichens in tropical forests. Frequent incidence of pyrenocarpous taxa in lichen biota of Goa prompted us to take up the exclusive study of this group in the State. The study revealed the occurrence of 79 species belonging to 15 genera and seven families. The family Pyrenulaceae had the maximum number of 23 species, while 20 belonged to the family Porinaceae. In comparison to North Goa, South Goa is fairly well explored for lichens representing 71 species from 11 localities. The following five species are reported as new to India — Porina exserta, P. siamensis, Pyrenula dissimulans, P. pyrenastrospora and P. rinodinospora. With the addition of five new records, the Goa State now represents 165 species of lichens, out of which 48% is represented by pyrenocarpous lichens. The present study will be useful for monographic studies on pyrenocarpous lichens and for environmental monitoring studies in the area, as this can be considered as a key indicator species.

scholarly journals Thermocyclops decipiens (Kiefer, 1929) (Copepoda, Cyclopoida) as indicator of water quality in the State of Minas Gerais, Brazil

2007 ◽  
Vol 50 (4) ◽  
pp. 695-705 ◽  
Author(s):  
Giovanni Guimarães Landa ◽  
Francisco Antonio Rodrigues Barbosa ◽  
Arnola Cecilia Rietzler ◽  
Paulina Maria Maia-Barbosa
Keyword(s):  
Water Quality ◽  
Indicator Species ◽  
Water Quality Index ◽  
Aquatic Ecosystems ◽  
Quality Index ◽  
Minas Gerais ◽  
The State ◽  
Copepoda Cyclopoida

The aim of this work was to study the possible utilization of Thermocyclops decipiens as indicator of the trophic degree and water quality of some watersheds of the state of Minas Gerais. From the beginning of the decade of 90, T. decipiens was recorded in several water collections of the state, including the basins of the rivers Paranaíba, São Francisco, Doce and Grande, within environments mainly of meso and eutrophics characteristics. Of the 28 places of occurrence of the species and according to the water quality index (WQI) used by Environmental Foundation of Minas Gerais (FEAM), 7 of these environments presented WQI good, 16 medium, 4 bad and one very bad. This classification corroborated the hypothesis that T. decipiens could be used as indicator species of eutrophic environments and of low water quality thus constituting an important tool for the biomonitoring of aquatic ecosystems.

Practical Picture Processing

1974 ◽  
Vol 32 ◽  
pp. 338-339
Author(s):  
T. A. Welton
Keyword(s):  
Radiation Damage ◽  
Coherence Length ◽  
Spatial Information ◽  
State Of The Art ◽  
Coherent Radiation ◽  
The State ◽  
Energy Spread ◽  
Electron Micrograph ◽  
Picture Processing ◽  
Molecular Skeleton

Various authors have emphasized the spatial information resident in an electron micrograph taken with adequately coherent radiation. In view of the completion of at least one such instrument, this opportunity is taken to summarize the state of the art of processing such micrographs. We use the usual symbols for the aberration coefficients, and supplement these with £ and 6 for the transverse coherence length and the fractional energy spread respectively. He also assume a weak, biologically interesting sample, with principal interest lying in the molecular skeleton remaining after obvious hydrogen loss and other radiation damage has occurred.

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