BernheimV1, Main, Exploration, bibRecord, 000181

Bias of reduced‐effort community surveys for adult Odonata of lentic waters

Identifieur interne : 000181 ( Main/Exploration ); précédent : 000180; suivant : 000182

Bias of reduced‐effort community surveys for adult Odonata of lentic waters

Auteurs : Jason T. Bried [États-Unis] ; Barbara J. Hager [États-Unis] ; Pamela D. Hunt [États-Unis] ; Jennette N. Fox [Canada] ; Heather J. Jensen [États-Unis] ; Kelly M. Vowels [États-Unis]

Source :

Insect Conservation and Diversity [ 1752-458X ] ; 2012-05.

RBID : ISTEX:29BAA31DE951409F12D0306827D6F994A056AC52

English descriptors

Teeft :
- Adult odonata, Adult odonate richness, Adult odonates, Authors insect conservation, Biweekly, Biweekly surveys, Bootstrap, Bootstrap intervals, Bried, Bried ervin, Butler demaynadier, Compositional comparisons, Data analysis, Data subsets, Ecological, Ecological entomology, Ecological restoration, Ecology, Effort levels, Emergent zone, Entomological, Foote hornung, Fourth surveys, Frequency length, Frequency length subset, Full data, Full effort, Greatest conservation need, Greatest rate, Hornung, Hornung rice, Inferential biases, Information loss, Insect conservation, Large variation, Lentic study sites, Lythrum salicaria, Manmade pond, Odonata, Odonata species, Odonata surveys, Odonate, Orderly surveys, Original effort, Osborn samways, Preliminary study, Rare species, Reece mcintyre, Regular intervals, Representative species assemblage, Representative spectrum, Resampling stats, Resident species, Restoration ecology, Richness, Royal entomological society, Sample coverage, Samways, Samways sharratt, Single year, Smallest effort, Species loss, Species richness, Species sightings, Study objectives, Study sites, Subset, Subset vector, Survey bias, Survey effort, Survey frequency, Survey length, Total detections, True richness, Typha, Wetland.

Abstract

Abstract. 1. Repeat surveys are needed to capture a representative spectrum of adult odonate richness at a site, but specifics on frequency and duration of surveys and associated inferential biases are poorly understood.

2. Weekly 1 h surveys of mature male dragonflies and damselflies were repeated at least 15 times at 19 ponds, lakes and wetlands scattered throughout North America. For each site, we tallied the data remaining when the weekly frequency was reduced to 75% (every 1.5 weeks), 50% (biweekly), 33% (triweekly), and 25% (monthly) and the 1 h survey to 50, 40, 30, 20 and 10 min subsets.

3. Reducing the original effort by half (i.e. to 30 min biweekly) retained about 80% of the species on average. The smallest effort (10 min monthly) retained about 49% of species. The greatest rate of information loss occurred between 20 and 10 min.

4. Across‐site analysis found that data subsets correlated to the original data set (r > 0.81) despite up to 50% species loss. Strong correlations (r ≥ 0.98) remained with 10–15% species loss.

5. Biweekly surveys lasting 20–40 min each may provide a representative and cost‐effective sample of adult odonate richness in lentic study sites. Losing a handful of species should not greatly undermine richness and compositional comparisons among sites.

Url:

https://api.istex.fr/document/29BAA31DE951409F12D0306827D6F994A056AC52/fulltext/pdf

DOI: 10.1111/j.1752-4598.2011.00156.x

Affiliations:

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Le document en format XML

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<front><div type="abstract">Abstract.  1. Repeat surveys are needed to capture a representative spectrum of adult odonate richness at a site, but specifics on frequency and duration of surveys and associated inferential biases are poorly understood.</div>
<div type="abstract">2. Weekly 1 h surveys of mature male dragonflies and damselflies were repeated at least 15 times at 19 ponds, lakes and wetlands scattered throughout North America. For each site, we tallied the data remaining when the weekly frequency was reduced to 75% (every 1.5 weeks), 50% (biweekly), 33% (triweekly), and 25% (monthly) and the 1 h survey to 50, 40, 30, 20 and 10 min subsets.</div>
<div type="abstract">3. Reducing the original effort by half (i.e. to 30 min biweekly) retained about 80% of the species on average. The smallest effort (10 min monthly) retained about 49% of species. The greatest rate of information loss occurred between 20 and 10 min.</div>
<div type="abstract">4. Across‐site analysis found that data subsets correlated to the original data set (r > 0.81) despite up to 50% species loss. Strong correlations (r ≥ 0.98) remained with 10–15% species loss.</div>
<div type="abstract">5. Biweekly surveys lasting 20–40 min each may provide a representative and cost‐effective sample of adult odonate richness in lentic study sites. Losing a handful of species should not greatly undermine richness and compositional comparisons among sites.</div>
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Bias of reduced‐effort community surveys for adult Odonata of lentic waters

Bias of reduced‐effort community surveys for adult Odonata of lentic waters

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri