Measuring abundance: Methods for the Estimation of Population Size and Species Richness

2021 ◽  
Author(s):  
Stephen Buckland
Keyword(s):  
Species Richness ◽  
Population Size

Fish population size, and not density, as the determining factor of parasite infection: a case study

Parasitology ◽  
2004 ◽  
Vol 128 (3) ◽  
pp. 305-313 ◽  
Author(s):  
A. M. BAGGE ◽  
R. POULIN ◽  
E. T. VALTONEN
Keyword(s):  
Species Richness ◽  
Population Density ◽  
Population Size ◽  
Fish Population ◽  
Host Population ◽  
Fish Length ◽  
Total Fish ◽  
Infection Parameters ◽  
The Mean

The diversity and abundance of parasites vary widely among populations of the same host species. These infection parameters are, to some extent, determined by characteristics of the host population or of its habitat. Recent studies have supported predictions derived from epidemiological models regarding the influence of host population density: parasite abundance and parasite species richness are expected to increase with increasing host population density, at least for directly transmitted parasites. Here, we test this prediction using a natural system in which populations of the crucian carp, Carassius carassius (L.), occur alone, with no other fish species, in a series of 9 isolated ponds in Finland. The ectoparasite communities in these fish populations consist of only 4 species of monogeneans (Dactylogyrus formosus, D. wegeneri, D. intermedius and Gyrodactylus carassii); the total and relative abundance of these 4 species varies among ponds, with one or two of the species missing from certain ponds. Across ponds, only one factor, total fish population size, explained a significant portion of the variance in both the mean number of monogenean species per fish and the mean total abundance of monogenean individual per fish. In contrast, fish population density did not influence either monogenean abundance or species richness, and neither did any of the other variables investigated (mean fish length per pond, number of fish examined per pond, distance to the nearest lake, and several water quality measures). In our system, proximity among fish individuals (i.e. host population density) may not be relevant to the proliferation of monogeneans; instead, the overall availability of host individuals in the host population appeared to be the main constraint limiting parasite population growth.

scholarly journals ENERGY, SPECIES RICHNESS, AND HUMAN POPULATION SIZE: CONSERVATION IMPLICATIONS AT A NATIONAL SCALE

2003 ◽  
Vol 13 (5) ◽  
pp. 1233-1241 ◽  
Author(s):  
Steven L. Chown ◽  
Berndt J. van Rensburg ◽  
Kevin J. Gaston ◽  
Ana S. L. Rodrigues ◽  
Albert S. van Jaarsveld
Keyword(s):  
Species Richness ◽  
Population Size ◽  
Human Population ◽  
National Scale ◽  
Conservation Implications

Nest Volume and Distance between Nests Do Not Affect Population Size or Species Richness of the Termitophilous Corotocini Fauna

2021 ◽  
Vol 59 (1) ◽  
Author(s):  
Carlos M. Pires-Silva ◽  
Igor Eloi ◽  
Bruno Zilberman ◽  
Maria A. Bezerra-Gusmão
Keyword(s):  
Species Richness ◽  
Population Size

Estimates of Species Richness and Population Size Based on Signs, Products, and Effects

2021 ◽  
pp. 268-280
Author(s):  
Peter A. Henderson
Keyword(s):  
Species Richness ◽  
Population Size ◽  
Insect Herbivore ◽  
Animal Groups ◽  
Insect Abundance ◽  
Plant Damage ◽  
Population Indices ◽  
The Relationship ◽  
Damage Criteria

Comparative surveys of species richness for some animal groups can be undertaken by surveying signs or products such as footprints, faeces, nests, burrows, or cast skins. Measures of the size of populations based on the magnitude of their products or effects are often referred to as population indices. Methods based on the collection of insect exuviae and frass are described and their efficiency discussed. Vertebrate monitoring based on a variety of signs is described. Methods that use plant damage criteria to assess insect herbivore abundance are presented. Methods to determine the relationship between plant damage and insect abundance are described.

scholarly journals Avifauna of Saurashtra University Campus, Rajkot, Gujarat, India

2020 ◽  
Vol 12 (13) ◽  
pp. 16764-16774
Author(s):  
Varsha Trivedi ◽  
Sanjay Vaghela
Keyword(s):  
Species Richness ◽  
Population Density ◽  
Population Size ◽  
Rare Species ◽  
Bird Species ◽  
Species Density ◽  
Ecological Indices ◽  
University Campus ◽  
High Species Richness ◽  
Line Transects

We examined the avifauna of Saurashtra University Campus (SUC), Rajkot, Gujarat from July to December 2017.  The study area was divided into four sections: North (N), East (E), South (S) and West (W) and surveyed over 18 visits (four line transects/visit).  We recorded a total of 82 bird species from 67 genera, 40 families and 16 orders.  Of these 57 species were terrestrial and 25 aquatic.  By population size the most abundant birds were members of Columbidae (28%), Sturnidae (13%), and Charadridae (8%).  Seventy per cent of birds observed (n=7665) were classed as very common and 2% (n=261) as very rare.  Species density (S/N = 3.39) and population density (n/N = 196) were at their maximum in December.  Ecological indices on temporal base reveal high species richness and Simpson diversity (1/D =17.0 and 1-D= 0.942) in August and November and Shannon diversity was high (H’=3.275) in November during study period.  

scholarly journals Monitoring vertebrate abundance in Austria: developments over 30 years

2020 ◽  
Vol 71 (1) ◽  
pp. 19-30
Author(s):  
Katharina Semmelmayer ◽  
Klaus Hackländer
Keyword(s):  
Species Richness ◽  
Population Size ◽  
Native Species ◽  
World Wide ◽  
Biodiversity Loss ◽  
Initial Population ◽  
Conservation Measure ◽  
Reptile Species ◽  
The World ◽  
Initial Population Size

SummaryLoss of biodiversity is one of the major challenges of the anthropocene. Various indices are used to quantify biodiversity. For vertebrates, the World Wide Fund for Nature (WWF) uses the Living Planet Index (LPI). It is calculated globally as well as separately for the species occurring in terrestrial, freshwater, and marine biomes. Action to prevent biodiversity loss can be taken by countries or provinces, so it is important to understand the changes in biodiversity at local scales. We present LPIs for vertebrates in Austria, both unweighted and weighted, according to species richness. Vertebrate populations seem to have declined strongly in Austria, and their abundance was stabilized at about 60% of the initial population size in the base year 1990—the LPI declined from 1 in 1990 to ~0.6 (unweighted) or ~0.7 (weighted) in 2015. This is almost double the global decline for the same period. LPIs were calculated separately for the terrestrial biome (~0.6), the freshwater biome (~0.9), birds (~0.7), and native species (~0.6). These indices give evidence that conservation measure to halt biodiversity loss in Austria is necessary and show where more data are needed. In Austria, more research is needed especially on populations of reptile species.

A multi-scale study of Orthoptera species richness and human population size controlling for sampling effort

2009 ◽  
Vol 97 (3) ◽  
pp. 265-271 ◽  
Author(s):  
Elena Cantarello ◽  
Claude E. Steck ◽  
Paolo Fontana ◽  
Diego Fontaneto ◽  
Lorenzo Marini ◽  
...  
Keyword(s):  
Species Richness ◽  
Population Size ◽  
Human Population ◽  
Sampling Effort ◽  
Multi Scale ◽  
Size Controlling

scholarly journals FLOWER VISITING BATS AND DURIAN TREES: SPECIES RICHNESS AND POPULATION SIZE

2021 ◽  
Vol 16 (5) ◽  
pp. 80-90
Author(s):  
NUR HAMZAH ZULFEMI MUHAMMAD ◽  
◽  
SUEY YEE LOW ◽  
SITI NOR SHAFFINAF MOHAMAD SHUKRI ◽  
AIDA HIDAYAH ABU SAMAH ◽  
...  
Keyword(s):  
Species Richness ◽  
Population Size ◽  
Flower Visiting
Sign in / Sign up

Export Citation Format

Share Document