Sistemas De Acasalamento E Biologia Reprodutiva Em Aves Aquáticas Neotropicais

Lama, Sílvia Nassif Del

doi:10.4257/oeco.2009.1301.11

Cited by 8 publications

(8 citation statements)

References 37 publications

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“…Colonial nesters also can be prone to conspecific brood parasitism (CBP), due to the availability, within colonies, of potential hosts' nests in high numbers [ 12 - 15 ]. In spite of showing an interesting breeding behavior, the genetic mating systems of colonial waterbirds, particularly those of Neotropical species, are not well studied [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Reconstructing genetic mating systems in the absence of parental information in colonially breeding waterbirds

2011

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BackgroundDNA-based studies have demonstrated that avian genetic mating systems vary widely, with many species deviating from long-assumed monogamy by practicing extra-pair paternity and conspecific brood parasitism. Colonially breeding waterbirds provide interesting models in which to investigate this question because they show nesting habits proposed to promote alternative reproductive strategies. However, little is known about the genetic mating systems of this group of birds, mainly due to difficulties in obtaining genetic data from incubating adults at nests that are necessary for conducting conventional parentage studies. Here, we inferred kinship patterns among offspring in broods of three co-distributed waterbird species, Wood Stork (Mycteria americana), Roseate Spoonbill (Platalea ajaja) and Great Egret (Ardea alba egretta), to investigate genetic mating system in the absence of parental data.ResultsMulti-step analyses combining estimates of relatedness coefficients, formulation of relationship-hypotheses, significance testing of alternative hypotheses, and maximum-likelihood sibship reconstruction techniques revealed evidence that alternative reproductive strategies may be present in natural populations of Wood Storks and Roseate Spoonbills, whereas relatedness of co-nestlings diagnosed in the Great Egrets did not deviate from a hypothesis of genetic monogamy. Specifically, under this analytical framework, inferred kinship relationships revealed that Great Egret nests contained full-sibling nestlings (100%), with the Roseate Spoonbill (RS) and Wood Stork (WS) exhibiting proportions of half-siblings (RS: 5%) and/or unrelated nestlings (RS: 24%; WS: 70%), patterns consistent with extra-pair paternity and conspecific brood parasitism, respectively.ConclusionsWe provide evidence that genetic monogamy occurs in Brazilian natural breeding colonies of the Great Egret, but is not the sole reproductive strategy employed by the Wood Stork and the Roseate Spoonbill. In fact, extra-pair paternity and conspecific brood parasitism were common in the latter two species, with a combined frequency of 7.5% and 11.3% in Roseate Spoonbill and Wood Stork, respectively. Although geographically co-distributed, differences among these species may be due to variation in their life histories. From a methodological standpoint, the approach implemented here, although not free from limitations, can have broad application for analyzing systems with limited genealogical information and/or in studying similarly challenging organisms in which obtaining genetic data on complete families is problematic.

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Section: Introductionmentioning

confidence: 99%

Reconstructing genetic mating systems in the absence of parental information in colonially breeding waterbirds

2011

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“…On the other hand, Piacentini et al (2009) reinforced the high importance of natural wetlands throughout the state as well, where the species was regularly observed in their research. This information demonstrates the need for more in-depth studies on the species, such as on its reproductive aspects, which were poorly studied until now (Miño & Del Lama, 2009), to assess breeding success estimates, which may help understand its potential for population expansion.…”

Section: Introductionmentioning

confidence: 99%

Breeding ecology of the Bare-Faced Ibis (Phimosus infuscatus) in Southern Brazil

Ferreira

Melo²,

Branco³

2022

Acta Sci. Biol. Sci.

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The Bare-faced Ibis is a gregarious bird found in South America. In the face of a rapid expansion in a southern state in Brazil and a lack of detailed information about the species' reproduction, two breeding areas were studied weekly for two consecutive seasons. We registered numbers and characteristics of adults, nests, eggs, and chicks, calculated success estimates, and assessed nest installation preferences. Chick morphology, age, and measurements served to define five growth stages. The species used the margins of two close rivers in Santa Catarina to build nests, lay eggs, and develop parental care between August and January, with success estimates as expected for the family. We observed a preference for the eastern margin of the rivers and proximity to bridges for nest installation, where the muddy margin provides resources for juvenile feeding. Two colony models were defined based on the near or far installation of the nests. Variations in egg and chick dimensions indicated higher adult investment in the second season, with negative allometric growth of the bill and tarsus of chicks related to weight. The results presented suggest favorable conditions for the species’ reproduction in the region, a considerable factor in understanding its expansion in recent years.

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“…Therefore, the application of DNA-based techniques would be the most direct approach to addressing the genetic mating system of colonial waterbirds. However, this avian group poses another challenge for this type of approach: attending adults are not easily captured at nests and genetic samples of complete families are therefore not available for conducting conventional parentage analyses [ 10 , 11 ]. Thus, so far, most inferences on the reproductive behavior of adults in wild waterbirds have been made mainly applying a methodological approach based on DNA-based kinship classification of nestling-pairs within nests, in the absence of parental genetic information [ 2 , 11 – 16 ].…”

Section: Introductionmentioning

confidence: 99%

Use of noninvasive ‘bug-eggs’ to enable comparative inferences on genetic mating system with and without parental information: A study in a cattle egret colony

Souza¹,

Moralez-Silva²,

Valdes³

et al. 2017

PLoS ONE

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Colonial waterbirds such as herons, egrets and spoonbills exhibit ecological characteristics that could have promoted the evolution of conspecific brood parasitism and extra-pair copulation. However, an adequate characterization of the genetic mating systems of this avian group has been hindered by the lack of samples of elusive candidate parents which precluded conducting conventional parentage allocation tests. Here, we investigate the genetic mating system of the invasive cattle egret using hematophagous insects contained in fake eggs to collect blood from incubating adults in a wild breeding colony. We tested a protocol with a previously unused Neotropical Triatominae, Panstrongylus megistus, obtained blood samples from males and females in 31 nests built on trees, drew blood from 89 nestlings at those nests, and genotyped all samples at 14 microsatellite loci, including six new species-specific loci. We comparatively addressed the performance of parentage allocation versus kinship classification of nestlings to infer the genetic mating system of cattle egrets. In line with previous behavioral observations, we found evidence in support of a non-monogamous genetic mating system, including extra-pair paternity (EPP) and conspecific brood parasitism (CBP). Parentage allocation tests detected a higher percentage of nests with alternative reproductive tactics (EPP: 61.7%; CBP: 64.5%) than the kinship classification method (EPP: 50.0%; CBP: 43.3%). Overall, these results indicate that rates of alternative reproductive tactics inferred in the absence of parental genetic information could be underestimated and should be interpreted with caution. This study highlights the importance of incorporating samples from candidate parents to adequately determine the genetic mating system of a species. We expand knowledge on the reproductive tactics of colonial waterbirds, contributing novel data on the genetic mating system of the cattle egret, valuable for the design of management strategies for this invasive bird.

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Sistemas De Acasalamento E Biologia Reprodutiva Em Aves Aquáticas Neotropicais

Cited by 8 publications

References 37 publications

Reconstructing genetic mating systems in the absence of parental information in colonially breeding waterbirds

Reconstructing genetic mating systems in the absence of parental information in colonially breeding waterbirds

Breeding ecology of the Bare-Faced Ibis (Phimosus infuscatus) in Southern Brazil

Use of noninvasive ‘bug-eggs’ to enable comparative inferences on genetic mating system with and without parental information: A study in a cattle egret colony

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