Efeito da coleta de morcegos por noites seguidas no mesmo local

Esbérard, Carlos Eduardo Lustosa

doi:10.1590/s0101-81752006000400016

Cited by 20 publications

(16 citation statements)

References 9 publications

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“…This pattern of decay is in line with that reported in other Neotropical and Temperate studies. Estrada et al [39] and Simmons & Voss [25] reported an average decay of 50–70% between the first and the second day of netting in Mexico and French Guyana, respectively, while Esbérard [40] in South-Eastern Brazil observed a reduction of 65% between the first and third days. A similarly marked decay is evident in the few studies reporting quantitative observations in other biogeographic regions; for example, in Missouri (U.S.A.), Robbins et al [41] observed a 45% decay between the first and second netting day.…”

Section: Discussionmentioning

confidence: 99%

Optimizing Sampling Design to Deal with Mist-Net Avoidance in Amazonian Birds and Bats

et al. 2013

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Mist netting is a widely used technique to sample bird and bat assemblages. However, captures often decline with time because animals learn and avoid the locations of nets. This avoidance or net shyness can substantially decrease sampling efficiency. We quantified the day-to-day decline in captures of Amazonian birds and bats with mist nets set at the same location for four consecutive days. We also evaluated how net avoidance influences the efficiency of surveys under different logistic scenarios using re-sampling techniques. Net avoidance caused substantial declines in bird and bat captures, although more accentuated in the latter. Most of the decline occurred between the first and second days of netting: 28% in birds and 47% in bats. Captures of commoner species were more affected. The numbers of species detected also declined. Moving nets daily to minimize the avoidance effect increased captures by 30% in birds and 70% in bats. However, moving the location of nets may cause a reduction in netting time and captures. When moving the nets caused the loss of one netting day it was no longer advantageous to move the nets frequently. In bird surveys that could even decrease the number of individuals captured and species detected. Net avoidance can greatly affect sampling efficiency but adjustments in survey design can minimize this. Whenever nets can be moved without losing netting time and the objective is to capture many individuals, they should be moved daily. If the main objective is to survey species present then nets should still be moved for bats, but not for birds. However, if relocating nets causes a significant loss of netting time, moving them to reduce effects of shyness will not improve sampling efficiency in either group. Overall, our findings can improve the design of mist netting sampling strategies in other tropical areas.

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Section: Discussionmentioning

confidence: 99%

Optimizing Sampling Design to Deal with Mist-Net Avoidance in Amazonian Birds and Bats

et al. 2013

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“…Through the richness estimator Chao 1 calculated for the streblid assemblages in the Atlantic Forest (Table 2), it was possible to observe that in some localities the expected richness is similar to the observed richness, despite differences in sampling effort among inventories. For a deeper analysis it is important to consider also the number of sites sampled in each locality, as higher sampling effort leads to higher capture efficiency and consequently enables a better sampling of the richness of the region (Esbérard, 2006).…”

Section: Discussionmentioning

confidence: 99%

Ectoparasitic flies (Diptera, Streblidae) of bats (Chiroptera, Phyllostomidae) in an Atlantic Forest area, southeastern Brazil

et al. 2013

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We studied infestation rates and parasite-host associations between streblid flies and phyllostomid bats in an Atlantic Forest area of Rio de Janeiro state, southeastern Brazil. We captured 301 individuals from seven Phyllostomidae bat species. Out of that total, 69 bats had been parasitised by nine Streblidae species; the most frequent species were Trichobius joblingi and Trichobius tiptoni. The species Paraeuctenodes longipes, associated with Anoura geoffroyi, was the most frequent species. The highest mean intensity was observed for Paraeuctenodes longipes, associated with A. geoffroyi, and Paratrichobius longicrus associated with Artibeus lituratus, both ectoparasite species with a mean intensity of five individuals per bat. Trichobius joblingi exhibited the highest mean abundance, which was over three on its host species. Streblid richness in the study area was similar to the richness found in other studies carried out in the Atlantic Forest. We observed that streblid richness in this biome depends more on inherent characteristics of each physiognomy and on the host-species than on the sampling effort.

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“…In surveys with continuous sampling effort, Esbérard (2006Esbérard ( , 2009) detected a declining trend on capture rates during consecutive sampling nights, and a negative trend on capture rates for common species with continuous effort, suggesting that bats might learn the position of the mist-nets and avoid them. Our results suggest that bats did not learn the position of the mist-nets, as the capture rates only slightly change over the three nights sampled each month.…”

Section: Discussionmentioning

confidence: 99%