[Leish-l] vector density or abundance

Thu Jan 3 08:50:59 -02 2019

One thing is the concept of density and abundance and the other is
practical.

Density is a measure of abundance given the volume or area from which we
make the inferences are specified. However, they are not synonymous.
Abundance is a more general concept that should be applied broadly to
denote a quantity of something. However, it encloses the concept of
density, which is a more strict physical concept to define a quantity
contained in a specified space, bi- or tridimensional. Density is an
estimation of abundance, aiming usually to calculate, in our case, a
measure of host-vector interaction, that is, with traps, any trap.
Therefore, it sounds that we might use abundance when not specifying a
particular space: "The importance of vector *abundance* and seasonality..."
and density to the methods for the estimation of abundance: "Vector
*density* gradients and the epidemiology of urban malaria in...".

The following issue is to estimate abundance from density in a way it would
indicate a less biased vector-host contact, particularly the biting rate
and the entomological inoculation rate. And this is the challenge since
vector density changes with the place, time, and the method. For
sand flies, it is quite intriguing and hard to estimate since it also
changes with temperature, rain, humidity and, mostly, to host species and
distance. A hard challenge that I am trying to grasp the results of an
experiment.

Thanks to all for your hints, teaching, and ideas. Should never stop to try
to learn from the older savant and from the smart youth.

Em qua, 2 de jan de 2019 às 19:14, Carlos Costa <chncosta at gmail.com>
escreveu:

> Thanks, Thiago. Very good explanation and citations.
>
>
> Em qua, 2 de jan de 2019 às 13:59, Thiago Vasconcelos dos Santos <
> thiagovasconcelos at iec.gov.br> escreveu:
>
>> 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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>
>
> --
> 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).
>
>
> Aviso: As informações contidas nesta mensagem são CONFIDENCIAIS,
> protegidas pelo sigilo legal, por direitos autorais e destinadas
> exclusivamente à pessoa ou organização para a qual a mensagem foi destinada.
> Warning: This message is meant only for the intended recipient of the
> transmission.  It is forbidden any unauthorized use, alteration,
> reproduction, and distribution. If you are not the correct recipient,
> please notify us immediately by return e-mail and delete this message from
> your system.
>

-- 
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).

Aviso: As informações contidas nesta mensagem são CONFIDENCIAIS, protegidas
pelo sigilo legal, por direitos autorais e destinadas exclusivamente à
pessoa ou organização para a qual a mensagem foi destinada.
Warning: This message is meant only for the intended recipient of the
transmission.  It is forbidden any unauthorized use, alteration,
reproduction, and distribution. If you are not the correct recipient,
please notify us immediately by return e-mail and delete this message from
your system.