scholarly journals Estimating species richness with capture–recapture models: choice of model when sampling in heterogeneous conditions

Bird Study ◽  
2005 ◽  
Vol 52 (2) ◽  
pp. 180-187 ◽  
Author(s):  
Frederic Jiguet ◽  
Olivier Renault ◽  
Aurelie Petiau
Keyword(s):  
Species Richness ◽  
Capture Recapture

scholarly journals SUGERENCIAS PARA ORGANIZAR, ADMINISTRAR Y EXPORTAR DATOS DE FOTO-TRAMPEO CON EL PROGRAMAWILD.ID

2018 ◽  
Vol 1 (2) ◽  
pp. 31
Author(s):  
Salvador Mandujano ◽  
Odalis Morteo-Montiel
Keyword(s):  
Species Richness ◽  
Information Management ◽  
Activity Patterns ◽  
Biosphere Reserve ◽  
Massive Data ◽  
Wildlife Monitoring ◽  
Capture Recapture ◽  
R Packages ◽  
Short Time ◽  
Scientific Name

ResumenEl foto-trampeo es una técnica de monitoreo de fauna que permite de forma relativamente sencilla la obtención de cientos de miles de datos en formato de fotografía, pero que requiere de herramientas para organizar esta información. Para este fin se han creado programas y aplicaciones disponibles en internet. En este artículo se detalla los pasos principales para usar el programa Wild.ID el cual permite etiquetar y organizar fotos en un tiempo corto. Una vez instalado, el proceso consta de tres pasos: 1) crear un proyecto, 2) cargar las fotos y etiquetarlas con el nombre científico de las especies, y 3) generar archivos de salida en formato Excel y .csv los cuales pueden ser usados para analizar diferentes aspectos (riqueza de especies, ocupación y abundancia, captura-recaptura, patrones de actividad y otros) en otros programas y en paquetes R. Para ejemplificar el uso del programa, en este artículo se emplea una base de datos obtenidos de un proyecto de monitoreo de fauna en la Reserva de Biósfera Tehuacán-Cuicatlán.Palabras clave: cámaras-trampa, monitoreo, especies, etiquetar metadatos, gestión información, formatos exportables.AbstractThe photo-trapping is a growing method for wildlife monitoring since it allows obtaining hundreds of thousands of photos in a relatively simple way. Tools are required to manage this massive data in a simple way. For this purpose different programs and applications are available in internet. This article details the use of the Wild.ID program, which is easy to use; allow tagging and organizing many photos in a relatively short time. Once installed, the process consists of three steps: 1) create a project, 2) upload the photos and label them with the scientific name of the species, and 3) generate files in Excel and .csv formats which can be used to analyze different aspects (species richness, occupation and abundance, capture-recapture, activity patterns and others) in other programs and in R packages. To exemplify the use of this program, in this article is used a set of data obtained from a wildlife monitoring project in the Tehuacán-Cuicatlán Biosphere Reserve. Wild.ID can be downloaded freely and works on the most common operating systems.Key words: cameras-trap, monitoring, species, label metadata, information management, exportable formats.

scholarly journals Pollinator Species Richness Trends: No Decelerating Declines in Dutch Bees and Bumblebees

2017 ◽  
Author(s):  
Tom J. M. Van Dooren
Keyword(s):  
Species Richness ◽  
Temporal Trends ◽  
Species Accumulation Curves ◽  
Wild Bees ◽  
Species Numbers ◽  
Pollinator Species ◽  
Species Survival ◽  
Capture Recapture ◽  
Local Species ◽  
Accumulation Curves

AbstractTemporal trends (1946–2013) in the species richness of wild bees from the Netherlands are analysed. We apply two methods to estimate richness change which both incorporate models for sampling effects and detection probability. The analysis is repeated for records with specimens deposited in collections, and a subset restricted to spatial grid cells that have been sampled repeatedly across three periods. When fitting non-linear species accumulation curves to species numbers, declines are inferred for bumblebees and at most limited declines for other bees. Capture-recapture analysis applied to species encounter histories infers a constant colonization rate per year and constant (bumblebees) or decreasing (other) local species survival. However, simulations suggest that the method estimates time trends in survival with a negative bias. Species richness trends predicted by the second approach are a 10% reduction in non-Bombus species richness and 29% fewer Bombus species since 1946, comparable to the predictions of the first approach. Neither analysis provides reliable evidence that decelerating declines in species richness occur in these taxa. Therefore we should not infer decelerating declines in pollinator species richness in N-W Europe as previously claimed.

Capture recapture électroniques en phosphorescence

1952 ◽  
Vol 12 (7) ◽  
pp. 749-801 ◽  
Author(s):  
Daniel Curie
Keyword(s):  
Capture Recapture

Dominance determines fish community biomass in a temperate seagrass ecosystem

2019 ◽  
Author(s):  
Aaron Matthius Eger ◽  
Rebecca J. Best ◽  
Julia Kathleen Baum
Keyword(s):  
Species Richness ◽  
Ecosystem Function ◽  
Fish Community ◽  
Prey Capture ◽  
Fish Communities ◽  
Functional Trait ◽  
Ecosystem Functions ◽  
Community Biomass ◽  
Ecosystem Valuation ◽  
Species Abundances

Biodiversity and ecosystem function are often correlated, but there are multiple hypotheses about the mechanisms underlying this relationship. Ecosystem functions such as primary or secondary production may be maximized by species richness, evenness in species abundances, or the presence or dominance of species with certain traits. Here, we combined surveys of natural fish communities (conducted in July and August, 2016) with morphological trait data to examine relationships between diversity and ecosystem function (quantified as fish community biomass) across 14 subtidal eelgrass meadows in the Northeast Pacific (54° N 130° W). We employed both taxonomic and functional trait measures of diversity to investigate if ecosystem function is driven by species diversity (complementarity hypothesis) or by the presence or dominance of species with particular trait values (selection or dominance hypotheses). After controlling for environmental variation, we found that fish community biomass is maximized when taxonomic richness and functional evenness is low, and in communities dominated by species with particular trait values – those associated with benthic habitats and prey capture. While previous work on fish communities has found that species richness is positively correlated with ecosystem function, our results instead highlight the capacity for regionally prevalent and locally dominant species to drive ecosystem function in moderately diverse communities. We discuss these alternate links between community composition and ecosystem function and consider their divergent implications for ecosystem valuation and conservation prioritization.

Functional evenness of bird communities varies along the elevational gradient in Europe: Conservation implications

2019 ◽  
Author(s):  
Federico Morelli ◽  
Yanina
Keyword(s):  
Species Richness ◽  
Elevation Gradient ◽  
Bird Species ◽  
Elevational Gradient ◽  
Negative Association ◽  
Bird Communities ◽  
Breeding Bird ◽  
Bird Species Richness ◽  
Large Spatial Scale ◽  
Functional Evenness

ContextThe negative association between elevation and species richness is a well-recognized pattern in macro-ecology. ObjectivesThe aim of this study was to investigate changes in functional evenness of breeding bird communities along an elevation gradient in Europe. MethodsUsing the bird data from the EBCC Atlas of European Breeding Birds we estimated an index of functional evenness which can be assumed as a measure of the potential resilience of communities.ResultsOur findings confirm the existence of a negative association between elevation and bird species richness in all European eco regions. However, we also explored a novel aspect of this relationship, important for conservation: Our findings provide evidence at large spatial scale of a negative association between the functional evenness (potential community resilience) and elevation, independent of the eco region. We also found that the Natura2000 protected areas covers the territory most in need of protection, those characterized by bird communities with low potential resilience, in hilly and mountainous areas.ConclusionsThese results draw attention to European areas occupied by bird communities characterized by a potential lower capacity to respond to strong ecological changes, and, therefore, potentially more exposed to risks for conservation.

Plant diversity and species richness of Ljubljana marsh grasslands under the influence of different cutting and fertilizing regimes

2009 ◽  
Vol 57 (2) ◽  
pp. 197-203 ◽  
Author(s):  
T. Sinkovč
Keyword(s):  
Species Richness ◽  
Plant Diversity ◽  
Grassland Management ◽  
Botanical Composition ◽  
Significant Negative Effect ◽  
Negative Effect ◽  
Cutting Regimes ◽  
N Rates ◽  
Exploitation Intensity ◽  
Plot Design

The botanical composition of grasslands determines the agronomic and natural values of swards. Good grassland management usually improves herbage value, but on the other hand it frequently decreases the plant diversity and species richness in the swards. In 1999 a field trial in a split-plot design with four replicates was therefore established on the Arrhenatherion type of vegetation in Ljubljana marsh meadows in order to investigate this relationship. Cutting regimes (2 cuts — with normal and delayed first cut, 3 cuts and 4 cuts per year) were allocated to the main plots and fertiliser treatments (zero fertiliser — control, PK and NPK with 2 or 3 N rates) were allocated to the sub-plots. The results at the 1 st cutting in the 5 th trial year were as follows: Fertilising either with PK or NPK had no significant negative effect on plant diversity in any of the cutting regimes. In most treatments the plant number even increased slightly compared to the control. On average, 20 species were listed on both unfertilised and fertilised swards. At this low to moderate level of exploitation intensity, the increased number of cuts had no significant negative effect on plant diversity either (19 species at 2 cuts vs. 20 species at 3 or 4 cuts). PK fertilisation increased the proportion of legumes in the herbage in the case of 2 or 3 cuts. The proportion of grasses in the herbage increased in all the fertilisation treatments with an increased numbers of cuts. Fertiliser treatment considerably reduced the proportion of marsh horsetail ( Equisetum palustre ) in the herbage of the meadows. This effect was even more pronounced at higher cut numbers. The proportion of Equisetum palustre in the herbage was the highest in the unfertilised sward with 2 cuts (26.4 %) and the lowest in the NPK-fertilised sward with 4 cuts (1.4%).

Sign in / Sign up

Export Citation Format

Share Document