SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

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	Agronomy (2)
	Ecology and Society (1)

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	Basso, Claudir José (2)
	Bayer, Cimélio (2)
	Cherubin, Maurício Roberto (2)
	Molin, José Paulo (2)
	Pias, Osmar Henrique de Castro (2)

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	Info:eu-repo/semantics/article (2)
	Peer-Reviewed Reports (1)

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	2018 (2)
	2001 (1)

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Variation in Native Bee Faunas and its Implications for Detecting Community Changes

Ecology and Society

Williams, Neal M; University of Calgary; nwilliam@ucalgary.ca; Minckley, Robert L; University of Utah; minckley@biology.utah.edu; Silveira, Fernando A; Universidade Federal de Minas Gerais; fernando@mono.icb.ufmg.br.

Changes in flower-visiting insect populations or communities that result from human impacts can be documented by measuring spatial or temporal trends, or by comparing abundance or species composition before and after disturbance. The level of naturally occurring variation in populations and communities over space and time will dictate the sampling effort required to detect human-induced changes. We compiled a set of existing surveys of the bee faunas of natural communities from around the world to examine patterns of abundance and richness. We focused on a subset of these studies to illustrate variation in bee communities among different sites and within sites over different spatial and temporal scales. We used examples from our compilation and other...

Tipo: Peer-Reviewed Reports

Palavras-chave: Apiformes; Apoidea; Faunal surveys; Flower-visiting insects; Functional groups; Monitoring long-term changes; Sampling protocol; Solitary bees; Species composition; Species richness; Worldwide bee faunas.

Ano: 2001

Soil penetration resistance mapping quality: effect of the number of subsamples

Agronomy

Pias, Osmar Henrique de Castro; Cherubin, Maurício Roberto; Basso, Claudir José; Santi, Antônio Luis; Molin, José Paulo; Bayer, Cimélio.

There is no consensus in the literature regarding how many subsamples are needed to perform accurate on-farm soil penetration resistance (SPR) mapping. Therefore, the objective of this study was to define the number of subsamples per sampling point needed to quantify the SPR. The experiment was performed in a 4.7 ha area and employed a 50 × 50 m grid system (18 sampling points). The SPR was evaluated using a digital penetrometer in two different years with 1, 2, 3, 4, 5, 6, 9, 12, and 15 subsamples per sampling point. The SPR maps produced with increasing numbers of subsamples were compared to the reference maps (15 subsamples) using the relative deviation coefficient and Pearson´s linear correlation. A reduction in the number of subsamples promoted an...

Tipo: Info:eu-repo/semantics/article

Palavras-chave: Soil compaction; Sampling protocol; Precision agriculture; Microvariability. soil compaction; Sampling protocol; Precision agriculture; Microvariability Física do solo.

Ano: 2018

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/34989