[Leish-l] RES: vector density or abundance

[Thiago Vasconcelos dos Santos]

Interesting question, Carlos!
In theory, flight interception traps (e.g.: adhesive sheets) are less biased towards baited traps (e.g.: light and lure traps), providing a more real picture on fly's density, since each species (with intra/interespecific heterogeneity) can respond differently to the bait. Capturing on a wall sounds to provide as well biasing results in terms of different equipment used and individual/professional dexterity. Although light-baited suction traps are one of the most widely used tools for vector surveillance, they have limitations in terms of their effect on collection efficiency, population data, and pathogen detection (McDermott & Mullens, 2018). For instance, heterogeneity on battery charge, light amperage or fan rotation may significantly change results, avoiding reproducibility. Fly's navigation is also dependent to several factors, such as natural (moon) and human-made lighting. Statistically-based estimation by Standardized Index of Species Abundance can be useful, but results will depend on the proper sampling.
We encourage entomologists to use a combined trapping methodological approaching to promote a broader and well-covered sample and properly answer questions and prove the hypothesis-driven about density/ abundance (Vasconcelos dos Santos et al. 2018)

McDermott EG, Mullens BA. The dark side of light traps. J Med Entomol. 2018;55:251–61.

Vasconcelos Dos Santos T, Prévot G, Ginouvès M, Duarte R, Silveira FT, Póvoa MM, Rangel EF. Ecological aspects of Phlebotomines (Diptera: Psychodidae) and the transmission of American cutaneous leishmaniasis agents in an Amazonian/ Guianan bordering area. Parasit Vectors. 2018 Nov 29;11(1):612. doi: 10.1186/s13071-018-3190-0.

Best wishes and a fruitful 2019!

Thiago Vasconcelos dos Santos
Tecnologista em Pesquisa e Investigação Biomédica
Instituto Evandro Chagas - SVS/MS
Seção de Parasitologia; Laboratório de Leishmanioses Prof Dr. Ralph Lainson
Rodovia BR 316 - Km 07, S/N -Levilândia - Cep: 67030.000
Ananindeua-PA  Fone: (91)3214-2003    www.iec.gov.br





-----Mensagem original-----
De: leish-l-bounces at lineu.icb.usp.br [mailto:leish-l-bounces at lineu.icb.usp.br] Em nome de Carlos Costa
Enviada em: domingo, 30 de dezembro de 2018 10:56
Para: Leish-L
Assunto: [Leish-l] vector density or abundance

Dear,

What would be better to use: vector abundance or vector density?

Capturing vectors on a wall, for instances, may be a direct measurement of
vector density, but when capturing in a CDC light trap is sounds better to
me to use vector abundance.

What do the entomologists and epidemiologists think?

Best wishes and a fruitful 2019!

Carlos.

-- 
Carlos H. N. Costa, MD, DSc.
President
Instituto de Doenças do Sertão
*Instituto de Doenças Tropicais Natan Portella*

*Centro de Ciências da Saúde da Universidade Federal do Piauí*
*Rua Artur de Vasconcelos 151-Sul*
*64001-450 Teresina-PI*
*Brazil*
Telephones: +55 86 3222-4377 (W),
+55 86 3221-3062 (W),
+55 86 3237-1075 (H).


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