Territorial behavior of the migratory Lined Seedeater during the breeding season

Martins, Gustavo de Melo; Cunha, Filipe Cristovão Ribeiro da; Lopes, Leonardo Esteves

doi:10.1007/s43388-021-00065-y

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…The establishment of territories can function as a mechanism to maintain control over different resources (Maher & Lott, 2000; Schradin, 2004). For this purpose, several species perform agonistic behaviors that allow them to delimit and keep intruders away from a territory (e.g., Atta laevigata , Salzemann & Jaffe, 1990; Gallinula mortierii , Putland & Golddizen, 1998; Stegastes fuscus , Silveira, Silva & Ferreira, 2020; Sporophila lineola , Martins, Cunha & Lopes, 2021). There is extensive discussion on how territorial animals behave towards conspecifics, depending on the degree of proximity or recognition (Bull et al, 2001; Thorington & Weigl, 2011).…”

Section: Introductionmentioning

confidence: 99%

Aggressive vocalizations during intergroup interactions in roost defense in the Spix's disk‐winged bat

et al. 2023

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Animals engage in agonistic interactions to gain exclusive access to territories and resources. Understanding these interactions in bats, however, has proven difficult given their high mobility and nocturnal habits. For bats, roosts are a critical resource; thus, the study of agonistic behaviors associated with the use of these resources could provide valuable information to understand how and whether individuals monopolize them. Here, we used Thyroptera tricolor to study agonistic behaviors associated with access to a roosting resource. We experimentally studied the behavioral responses of focal groups when interacting with different intruders during the occupation of an ephemeral roosting resource. We found that T. tricolor responds more aggressively to intruders than to members of its own group, increasing the number of aggressive vocalizations. We also found differences in the rate of agonistic behaviors based on the identity of the intruders. Specifically, we observed that bats produced a large number of aggressive vocalizations when interacting with nearby intruders, supporting the “nasty neighbor” hypothesis. This study provided the first empirical evidence that aggressive vocalizations may serve as a mechanism to defend and maintain exclusive roosting sites in social groups of T. tricolor.

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Section: Introductionmentioning

confidence: 99%

Aggressive vocalizations during intergroup interactions in roost defense in the Spix's disk‐winged bat

et al. 2023

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“…19 Males defend small territories by singing from sunrise to sunset. 20 The distinction between females and similar-looking brownish males is possible based on their behaviour (males sing, while females do not) or in the presence of brood patch. 11 Only the females build the nests and incubate the eggs, while both sexes feed the nestlings.…”

Section: Study Sitementioning

confidence: 99%

Male plumage colouration predicts female reproductive investment and nestling survival in a colour dimorphic tropical songbird

Ferreira

Cunha

Lopes

2023

Avian Biology Research

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In sexually colour dimorphic bird species, males can exhibit phenotypic variation, with males breeding in either dull female-like plumage or brightly coloured plumage. Two contradictory hypotheses predict that the male phenotype variation can influence the female investment in a given breeding attempt. Whereas females usually prefer males in bright coloured plumage, the “differential allocation hypothesis” predicts that females should invest more in their reproductive output when mating with them; while the “compensatory investment hypothesis” predicts that females should invest more when mating with non-preferred males. To test those predictions, we analysed reproductive data for two consecutive breeding seasons (2018–2019 and 2019–2020) of Lined Seedeaters Sporophila lineola. S. lineola is a socially monogamous songbird species in which males exhibit two breeding phenotypes, a black-and-white plumage being the most common, and a less common female-like brownish plumage. Our findings show that females mated with brownish males have a higher reproductive investment (i.e., egg volume) than those mated with black-and-white males. Despite the lower investment of females in egg volume, our results showed that black-and-white males have a higher nestling survival, producing more hatchings and fledglings per season than brownish males, which could suggest a higher fitness. Our findings indicate that investment allocation on the eggs and offspring survival rates can be attributed to the plumage colour of males.

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“…The first Lined Seedeaters arrive in the study area in late November and laying dates span from early December to late April (Ferreira and Lopes 2017). Males of this socially monogamous species defend small territories (Martins et al 2021) where females build the nests and incubate the eggs; both sexes feed the nestlings (Oliveira et al 2010, Ferreira andLopes 2017). This species has marked sexual dimorphism.…”

Section: Study Speciesmentioning

confidence: 99%

Molt strategy and delayed plumage maturation in the Lined Seedeater

Ferreira,

Figueira,

Cunha

et al. 2023

JFO

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Lined Seedeaters Sporophila lineola, an intra-tropical migratory songbird, exhibit extensive phenotypic variation, with characteristic black-and-white male and brownish female plumages. In this study, we investigated whether variation in male plumage represents delayed plumage maturation, as reported for many other Sporophila seedeaters. We used data on molt and plumage from a seven-year-long study of color-banded Lined Seedeaters in southeastern Brazil. We also gathered molt and plumage data from museum collections and citizen-science platforms to identify which molts occur outside the breeding grounds. Our findings show that Lined Seedeaters follow a complex basic strategy, but the possibility that some individuals exhibit a complex alternate strategy, which is a common strategy among congeners, cannot be ruled out. Preformative molt and fresh formative plumage were recorded within the breeding grounds in the last months of the breeding season. Prebasic molt also start on the breeding grounds and probably continue during migration to the wintering grounds. Observed phenotypic variation in plumage of Lined Seedeater males is a product of delayed plumage maturation. Breeding males in female-like plumage are formative individuals in their first breeding season. All monitored males acquired black-and-white definitive plumage after their first breeding season, during the second pre-basic molt, but we found limited evidence that some individuals may retain the brownish plumage for more than one cycle. Descriptions presented here advance our understanding of Sporophila molt strategies that can be used in future studies focusing on the evolutionary and ecological underpinnings of plumage variation.RESUMEN. Sporophila lineola, una especie de ave cantora migratoria intra-tropical, muestra amplia variación fenotípica, con plumajes característicos blanco y negro en los machos y café en las hembras. En este estudio investigamos si la variación en el plumaje de los machos representa maduración retardada del plumaje, como es reportado para muchos otros semilleros del género Sporophila. Utilizamos datos de muda y del plumaje de un estudio de siete años de duración en individuos de Sporophila lineola anillados con anillos de color en el sureste de Brasil. También recolectamos datos de muda y plumaje de colecciones de museo y plataformas de ciencia ciudadana para identificar las mudas que ocurren fuera de las áreas de reproducción. Nuestros resultados muestran que Sporophila lineola sigue una estrategia compleja básica, pero la posibilidad que algunos individuos muestren una estrategia compleja alterna, la cual es una estrategia común en congéneres, no puede ser descartada. La muda preformativa y el plumaje formativo fresco fueron registrados en las áreas de reproducción en los últimos meses de la temporada reproductiva. La muda prebásica también inicia en las áreas de reproducción y probablemente continua durante la migración a los sitios de invierno. La variación fenotípica observada en el plumaje de los machos de Sporophila l...

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Territorial behavior of the migratory Lined Seedeater during the breeding season

Cited by 4 publications

References 21 publications

Aggressive vocalizations during intergroup interactions in roost defense in the Spix's disk‐winged bat

Aggressive vocalizations during intergroup interactions in roost defense in the Spix's disk‐winged bat

Male plumage colouration predicts female reproductive investment and nestling survival in a colour dimorphic tropical songbird

Molt strategy and delayed plumage maturation in the Lined Seedeater

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