Field sampling methods on seismic lines: A comparison between circular plots and belt transects

2021 ◽  
Author(s):  
Caren Jones ◽  
Angeline Van Dongen ◽  
Jill Harvey ◽  
Dani Degenhardt
Keyword(s):  
Sampling Methods ◽  
Field Sampling ◽  
Seismic Lines

Planning programs to estimate salmon harvest with coded-wire tags

1998 ◽  
Vol 55 (8) ◽  
pp. 1983-1995 ◽  
Author(s):  
David R Bernard ◽  
Robert P Marshall ◽  
John E Clark
Keyword(s):  
Sampling Methods ◽  
Coho Salmon ◽  
Cost Functions ◽  
Commercial Fisheries ◽  
Sampling Strategies ◽  
Sample Sizes ◽  
Field Sampling ◽  
Tag Loss ◽  
Coded Wire Tags

Methods are presented for planning individual catch-sampling, tagging, and field-sampling programs to estimate salmon (Oncorhynchus spp.) harvest in recreational and commercial fisheries from several hatchery-produced and wild cohorts through recovery of coded-wire tags. We show how to determine sample sizes sufficiently large to detect harvest and link sample sizes to expenditures through linear and allometric cost functions to determine optimal tagging and catch-sampling rates. Sample sizes that will minimize bias and variance are charted for field-sampling programs designed to estimate the fraction of a cohort with tags. We describe sampling strategies that can be used to detect or to minimize bias in harvest estimates from tag loss, tag-induced mortality, tag-induced straying, and nonrandom sampling. Methods are demonstrated with data on cohorts of chinook (O. tshawytscha) and coho salmon (O. kisutch) from Alaska.

scholarly journals A Comparison of Three Field Sampling Methods to Estimate Soil Carbon Content

2012 ◽  
Vol 58 (5) ◽  
pp. 513-522 ◽  
Author(s):  
Luke Worsham ◽  
Daniel Markewitz ◽  
Nathan P. Nibbelink ◽  
Larry T. West
Keyword(s):  
Carbon Content ◽  
Soil Carbon ◽  
Sampling Methods ◽  
Field Sampling ◽  
Soil Carbon Content

Mosquito Ecology: Field Sampling Methods

1976 ◽  
Vol 22 (4) ◽  
pp. 435-436
Author(s):  
B. F. Eldridge
Keyword(s):  
Sampling Methods ◽  
Field Sampling ◽  
Mosquito Ecology

Mosquito ecology: Field sampling methods

1976 ◽  
Vol 1 (3) ◽  
pp. 283-284
Author(s):  
B.R. Laurence
Keyword(s):  
Sampling Methods ◽  
Field Sampling ◽  
Mosquito Ecology

scholarly journals Field sampling methods for investigating forest-floor bryophytes: Microcoenose vs. random sampling

2018 ◽  
Vol 70 (3) ◽  
pp. 589-598
Author(s):  
Milos Ilic ◽  
Ruzica Igic ◽  
Mirjana Cuk ◽  
Dragana Vukov
Keyword(s):  
Species Richness ◽  
Random Sampling ◽  
Forest Floor ◽  
Sampling Method ◽  
Sampling Methods ◽  
Diversity Index ◽  
Systematic Sampling ◽  
Field Sampling ◽  
Beech Forests ◽  
Quadrat Size

Because of the high importance of bryophytes in forest ecosystems, it is necessary to develop standardized field sampling methodologies. The quadrat method is commonly used for bryophyte diversity and distribution pattern surveys. Quadrat size and the position of quadrats within the studied area have a significant influence on different analyses. The aim of the present study was to define the minimum quadrat size appropriate for sampling ground bryophytes in temperate beech forests, to compare two different field sampling methods for research on ground bryophytes, the random and microcoenose methods; and to test the adequacy of the microcoenose sampling method in temperate beech forests. Research was carried out on Fruska Gora mountain (Serbia) at four different sites. All sites contained temperate broadleaf forest vegetation, predominantly Fagus sylvatica, but also included various other tree species. Systematic sampling based on nested quadrats was used to determine the minimum sampling area. Random sampling was performed using 10 or 20 microplots (minimum area quadrat), randomly located within 10x10 m plots. Microcoenose sampling is a systematic sampling method based on the fact that every bryophyte fragment on the forest floor is a separate microcoenose. These methods were compared using the following criteria: species richness; Shannon?s diversity index and evenness measure; coverage of dominant species, and the time needed for sampling. The microcoenose sampling method has proven to be highly applicable in temperate beech forests in terms of species richness and diversity, in contrast to random sampling, which was not suitable for bryophyte flora with a patchy distribution.

Quality Control in Field Sampling Methods

2009 ◽  
pp. 329-329-10
Author(s):  
KN Kontopanos ◽  
ES Williams
Keyword(s):  
Quality Control ◽  
Sampling Methods ◽  
Field Sampling

Improvement of field sampling methods for adult Karoo paralysis ticks, Ixodes rubicundus (Acari: Ixodidae), through addition of host odour

1995 ◽  
Vol 19 (2) ◽  
pp. 93-101 ◽  
Author(s):  
L. J. Fourie ◽  
F. van der Lingen ◽  
D. J. Kok
Keyword(s):  
Sampling Methods ◽  
Field Sampling ◽  
Ixodes Rubicundus

Local habitat features explain the distribution of the imperiled grass pickerel (Esox americanus vermiculatus)

2019 ◽  
Vol 97 (5) ◽  
pp. 479-487
Author(s):  
J.E. Colm ◽  
N.E. Mandrak ◽  
B.L. Tufts
Keyword(s):  
Fish Community ◽  
Agricultural Land ◽  
Sampling Methods ◽  
Habitat Preferences ◽  
Field Sampling ◽  
Community Assemblage ◽  
Habitat Features ◽  
Community Data ◽  
Local Habitat ◽  
Habitat Variables

We investigated patterns of grass pickerel (Esox americanus vermiculatus Lesueur, 1846) distribution in three watersheds in Ontario, Canada, using site- and reach-scale habitat variables and fish community assemblage data to determine why this species occurs sporadically throughout watersheds despite abundant seemingly suitable, but unoccupied, habitat. Habitat and fish community data were collected using conventional field sampling methods, and reach-scale habitat data were compiled with the aid of a geographic information system. We found that occupied sites had lower baseflow indices and reach slopes but higher conductivity and agricultural land uses than unoccupied sites. More grass pickerel were detected when conductivity, channel cover, and wetlands in the floodplain were highest and bank slopes lowest; this is consistent with habitat preferences described elsewhere in its range. Habitat features at the site scale appeared more important than reach-scale features suggesting that grass pickerel may be using small habitat patches. This study identifies habitat elements important to grass pickerel and offers insights into management implications.

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