Feeding and defaecation patterns in Triatoma sordida

Crocco, LB; Catalá, Silvia

doi:10.1590/s0074-02761996000400004

Cited by 25 publications

(30 citation statements)

References 8 publications

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“…Comparison between the RMS observed for Triatoma patagonica in the present study and for other peridomestic species by other authors shows that the capacity of nymphs of Triatoma patagonica (3.52) is lower than that of nymphs of Triatoma sordida (4.10) 5 and higher than that of nymphs of Triatoma guasayana (2.23) 13 . As seen with other Triatominae 5 10 13 , in fifth-instar nymphs of Triatoma patagonica the blood meal size controls the excretion behavior, i.e.…”

Section: Discussionsupporting

confidence: 70%

Comparison of feeding and defecation patterns between fifth-instar nymphs of Triatoma patagonica (Del Ponte, 1929) and Triatoma infestans (Klug, 1934) under laboratory conditions

Rodríguez

Carrizo

Crocco

2008

Rev. Soc. Bras. Med. Trop.

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Among the vectors of Chagas disease, Triatoma patagonica is a species in the process of adaptation to the human environment. However, its vector competence is not well known. This study had the aim of evaluating and comparing feeding and defecation patterns among fifth-instar nymphs of Triatoma patagonica and Triatoma infestans that were fed ad libitum. The results showed that nymphs of Triatoma patagonica had a feeding pattern similar to that of Triatoma infestans. Sixty nine percent and 58% of nymphs of Triatoma patagonica and Triatoma infestans, respectively, produced their first defecation within five minutes after being fed. Triatoma patagonica defecated during feeding, with an average time until first defecation that was shorter than that of Triatoma infestans (3.4 and 6.2 min, respectively). The nymphs of Triatoma patagonica were capable of defecating during or immediately after feeding.

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Section: Discussionsupporting

confidence: 70%

Comparison of feeding and defecation patterns between fifth-instar nymphs of Triatoma patagonica (Del Ponte, 1929) and Triatoma infestans (Klug, 1934) under laboratory conditions

Rodríguez

Carrizo

Crocco

2008

Rev. Soc. Bras. Med. Trop.

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“…Its blood ingestion is frequently incomplete due to interruptions and the insect will not start to defecate. Crocco & Catalá (1996) observed in T. infestans and T. sordida, that the first species was the most efficient except for the females. Our data do not show any differences regarding sex, but the authors used another index (Zeledon et al 1977) without considering the excretions emitted before the end of feeding.…”

Section: Discussionmentioning

confidence: 83%

“…The 5 th nymphal instar of T. sordida feeds on more blood than T. infestans, which allows this species to survive longer with just one meal (Perlowagora 1973, Juarez & Castro 1982. Nymphs and adults of T. sordida defecated immediately after feeding or frequently defecated during feeding (Crocco & Catalá 1996); the quantity ingested depended on the nutritional state of insect at the moment of feeding, which is related to dispersal activity. Different studies have shown that a low nutritional state is a determinant for adult dispersal by flying…”

Section: Discussionmentioning

confidence: 99%

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Vectorial capacity of Triatoma guasayana (Wygodzinsky & Abalos) (Hemiptera: Reduviidae) compared with two other species of epidemic importance

Loza-Murguia¹,

Noireau²

2010

Neotrop. entomol.

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-Triatoma guasayana (Wygodzinsky & Abalos) is a peridomestic triatomine with epidemiological importance in Bolivia, that may play an important role in the transmission of Trypanosoma cruzi (Chagas). In this study, two parameters of vectorial capacity were evaluated: the interval of feeding-defecation time and metacyclogenesis, in adult males and females and nymphal instars II to V of T. guasayana with comparisons with Triatoma infestans (Klug) and T. sordida (Stal). The results showed a close relationship between ingestion of blood and beginning of defecation. Values were negative in T. infestans, and T. sordida for instars II, III, IV, and V and also males and females but were positive in female T. sordida. Triatoma guasayana showed only negative values for instar II. Adults and nymphs began defecation as soon as they had finished feeding and required an average of 29.8 min. The analysis of metacyclogenesis showed that T. guasayana was superior to T. infestans and T. sordida. However, the vectorial effectiveness of T. guasayana was significantly affected regarding the percentage of metacyclic trypomastigotes during instars III to V and showed a progressive increase. Females had higher proportions despite their ingestion being half that of T. infestans. The different instars of T. guasayana had a higher parasitic load than those of T. sordida and, although ingestion was 1/3 of that of female T. infestans, there was a progressive increase in metacyclic trypomastigotes in the different nymphal stages of T. guasayana that decreased in adults.

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