A method for quantifying bird colonies in sand bars via GPS

Raeder, Fernando Loschiavo; Bernhard, Rafael

doi:10.1590/s1519-69842003000300021

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…Successful adaptations to the extreme conditions between flood and dry seasons are crucial to the survival of both resident and migratory species (Junk et al, 1989;Alho & Silva, 2012). With decreasing water levels, sandbanks and beaches along river margins become available for a few months as nesting grounds for many waterbirds, among them colonial seabirds (Raeder & Bernhard, 2003;Zarza et al, 2013). Skimmer nests are formed of simple, shallow scrapes in such temporary sandbars, with neighboring nests often only being separated by a few meters or less (Zarza et al, 2013;Antas et al, 2016;Schuchmann et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Incubation parameters, offspring growth, and behavioral adaptations to heat stress of Black Skimmers (Rynchops niger) in a Neotropical inland colony (Aves, Charadriiformes, Laridae)

Schuchmann¹,

Schley²,

Hegmann³

et al. 2022

Pap. Avulsos Zool.

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This study focuses on incubation parameters, egg morphometrics, and body mass development, hatching, and behavioral adaptations to heat stress within a colony of freshwater-breeding Black Skimmers (Rynchops niger) located in the private nature reserve of Serviço Social do Comércio (SESC) in the northern Pantanal, Mato Grosso, Brazil. Temperatures of nest, eggs, and surface substratum, as well as the development of embryos, were surveyed using thermal imaging, a method allowing digital recording from a distance and in a fraction of the time of traditional measuring techniques. The mean egg dimensions (n = 71) were 4.48 (± 0.13) × 3.27 (± 0.07) cm; the mean mass at hatching was 24.3 (± 1.9) g, with a significant decrease over incubation time. The mean surface temperature of eggs varied from 30.9℃ to 39.7℃, while the sand surface temperature was 20℃ at 06:00 h, rising to 47.7℃ at 11:00 h. There was a significant increase (7%) in egg surface temperature throughout incubation. Incubation-bout durations (n = 2108) were correlated with the microclimatic conditions of the substratum, becoming shorter with increasing sand-surface temperature around midday. Egg hatching lasted one day, and siblings hatched no more than 24 h apart. The mean body mass on Day 1 after hatching was 16.8 (± 1.6) g (n = 6). Three days after hatching, chicks moved to new sand depressions provided by parents near the original nest, where they remained motionless or tried to hide under riparian vegetation. The single chick that fledged had a growth rate of K = 0.117 and a t₁₀₋₉₀ value of 37.3 days. On Day 7, dorsal pintail feathers and primaries appeared, which were open on Day 15. After 14 days, the chick was able to regulate its body temperature, and no more feeding by parental birds during the daytime was observed. On Day 21, the immature plumage was fully developed. Fledging was completed on Day 27. Our study demonstrates that thermal imaging is a useful method of surveying egg and embryo development in the Black Skimmer, reducing nest disturbance and observation efforts.

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Section: Introductionmentioning

confidence: 99%

Incubation parameters, offspring growth, and behavioral adaptations to heat stress of Black Skimmers (Rynchops niger) in a Neotropical inland colony (Aves, Charadriiformes, Laridae)

Schuchmann¹,

Schley²,

Hegmann³

et al. 2022

Pap. Avulsos Zool.

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Community-based conservation with formal protection provides large collateral benefits to Amazonian migratory waterbirds

et al. 2021

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Populations of migratory waterbirds are facing dramatic declines worldwide due to illegal hunting, habitat loss and climate change. Conservation strategies to reverse these trends are imperative, especially in tropical developing countries, which almost invariably allocate insufficient levels of investment for environmental protection. Here, we compared the effectiveness of sustainable-use Protected Areas (PAs) and Community-based Conservation (CBC) arrangements for the conservation of migratory waterbirds that breed on seasonal riverine sandy beaches in Brazilian Amazonia. We modeled local population responses of four migratory waterbird species on 155 beaches along a ~1,600 km section of a major tributary of the Amazon, as a function of community enforcement, official protection status, human pressure and landscape features. We show that 21 community-protected beaches within the study area host more than 80% of all sampled birds. Black Skimmers showed the most dramatic response, with breeding numbers 135-fold larger in CBC arrangements compared to beaches with no official protection status. The same pattern was observed for nesting Large-Billed and Yellow-Billed Terns. For the Near Threatened Orinoco Goose, PA status was the strongest predictor of local population size. These dramatic results demonstrate the value of protected refugia, achieved through the concerted action of participating local communities, to support breeding populations of key waterbird species. This highly-effective and low-cost conservation model can potentially be replicated in other regions of the developing world experiencing increasingly intensive exploitation of riverine natural resources.

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Distribution, Abundance and Habitat Selection by Breeding Yellow-billed Terns (Sternula superciliaris), Large-Billed Terns (Phaetusa simplex) and Black Skimmers (Rynchops niger) in the Brazilian Amazon

2013

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A method for quantifying bird colonies in sand bars via GPS

Cited by 3 publications

References 2 publications

Incubation parameters, offspring growth, and behavioral adaptations to heat stress of Black Skimmers (Rynchops niger) in a Neotropical inland colony (Aves, Charadriiformes, Laridae)

Incubation parameters, offspring growth, and behavioral adaptations to heat stress of Black Skimmers (Rynchops niger) in a Neotropical inland colony (Aves, Charadriiformes, Laridae)

Community-based conservation with formal protection provides large collateral benefits to Amazonian migratory waterbirds

Distribution, Abundance and Habitat Selection by Breeding Yellow-billed Terns (Sternula superciliaris), Large-Billed Terns (Phaetusa simplex) and Black Skimmers (Rynchops niger) in the Brazilian Amazon

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