Sergio Nolazco

Monash University (Australia) · School of Biological Sciences, Clayton

Understanding what drives the evolution of nectar-robbing strategies is key for gaining insight into the functioning of pollination networks. However, nectar robbing is often an anecdotal behaviour, difficult to quantify and record through field observations, especially in hummingbirds, limiting our understanding of how ecological networks change a...

Cooperation may emerge from intrinsic factors such as social structure and extrinsic factors such as environmental conditions. Although these factors might reinforce or counteract each other, their interaction remains unexplored in animal populations. Studies on multilevel societies suggest a link between social structure, environmental conditions...

Although variation in effect sizes and predicted values among studies of similar phenomena is inevitable, such variation far exceeds what might be produced by sampling error alone. One possible explanation for variation among results is differences among researchers in the decisions they make regarding statistical analyses. A growing array of studi...

Multilevel societies are formed when stable groups of individuals spatially overlap and associate preferentially with other groups, producing a hierarchical social structure.1 Once thought to be exclusive to humans and large mammals, these complex societies have recently been described in birds.2,3 However, it remains largely unclear what benefits...

Recent evidence suggests that female ornaments can commonly act as signals. However, how signaling functions might be affected by the tendency for reduced ornament elaboration in relation to males is less well-understood. We address this in mutually ornamented purple-crowned fairy-wrens. We investigated putatively ornamental (tail, ear coverts, cro...

Female ornaments are often reduced, male-like traits. Although these were long perceived as non-functional, it is now broadly accepted that female ornaments can be adaptive. However, it is unclear whether this is as common in females as it is in males, and whether ornaments fulfil similar signalling roles. Here, we apply a bivariate meta-analysis t...

Female ornaments are often reduced, male-like traits. Although these were long perceived as nonadaptive, it is now broadly accepted that female ornaments can be functional. However, it is unclear whether this is as common in females as it is in males, and whether ornaments fulfil similar signalling roles. To test this, we conduct a systematic revie...

Habitat selection assessments at multiple spatial scales provide a more complete understanding of the habitat requirements of a species, a matter that is especially useful for managing endangered wildlife. Studies of the diet and population distribution of threatened Peruvian Plantcutters (Phytotoma raimondii) suggest that the presence of Prosopis...

The evolution of ornaments as sexually selected signals is well understood in males, but female ornamentation remains understudied. Fairy wrens offer an excellent model system, given their complex social structure and mating systems, and the diversity of female ornamentation. We investigated whether early molt into ornamental breeding plumage plays...

These files include the data needed to reproduce the analyses of our paper entitled "No evidence for an adaptive role of early molt into breeding plumage in a female fairy-wren". We also include a readme document explaining what specific data file was used for each analysis and a detail explanation of all column headers.

Flexible compensatory parental care takes place when one parent increases its parental effort in response to its mate's reduction or absence. Although this behavioural response is well known in species with biparental care, the few cases attributed to species with uniparental care are usually based on descriptive observations of apparent compensati...

Population size is a major criterion in evaluating the conservation status of threatened species and for designing management strategies. Therefore, using a distance sampling approach, the number of adult individuals of the endangered Peruvian Plantcutter (Phytotoma raimondii) at the protected area Pómac Forest Historical Sanctuary was estimated in...

The endangered Peruvian Plantcutter (Phytotoma raimondii) is a strictly herbivorous, mostly folivorous passerine endemic to the arid lowlands of northwestern Peru. Previous information obtained from the study of 3 of its major populations consistently suggests the selective use of plant material from the shrub Grabowskia boerhaaviaefolia and Prosop...

In some species with uniparental care, when the parental individual deserts the offspring or dies, its mate may adopt the parental responsibilities, a behaviour known as flexible compensation of uniparental care. However, for most of the species in which this behavioural response has been reported in the literature, there was no thorough investigat...

Abstract. – The Peruvian Plantcutter (Phytotoma raimondii, Cotingidae), endemic to northwestern Peru, is endangered due to increasing habitat loss. Here, we describe the breeding cycle from which we attempt to infer life history patterns and possible conservation strategies. We captured and marked 16 pairs of plantcutters in 2011 at the Pómac Fores...

La estimación de parámetros poblacionales para especies amenazadas es crucial para la ejecución de prácticas adecuadas de conservación que conlleven a la recuperación y mantenimiento de las mismas. La Cortarrama Peruana (Phytotoma raimondii) es una especie en peligro y restringida al noroeste del Perú, de la que se conoce muy poco respecto a su tam...

We present photographic records and sound recordings of Ancash Tapaculo (Scytalopus affinis), which evidenced the extension of its known range northward to La Libertad department. Furthermore, we review and added records to its southernmost known distribution in the department of Lima and easternmost records in Huánuco department. We include habita...

Here we described some observations on the reproduction of Phytotoma raimondii collected in the year 2012 during an ongoing research for estimating reproductive success inside the protected area ‘Bosque de Pomac’ Historical Sanctuary. We report the first complete nesting intervals for the species and include additional descriptive information about...

We evaluated the diet composition of two pairs of Peruvian Plantcutters (Phytotoma raimondii) in the province of Talara, and perform a diet selection analysis by season (reproductive, non reproductive) for both pairs independently. Reported consumption of products mainly included leaves, flowers and fruits, and involved ten species of native plants...

En la ciudad de Lima, mediante un acelerado proceso de urbanización, se ha reducido gran parte de sus áreas verdes a unos pocos parques y jardines, los cuales albergan actualmente una avifauna particular. Entre junio y setiembre del 2009 se realizó diversos conteos de aves basados en una modificación del método de listas fijas de MacKinnon en 120 d...

The high frequency of melanism in the Vermilion Flycatcher Pyrocephalus rubinus obscurus Gould 1839 at Lima city (Perú) polymorphic population give rise to some hypotheses, mostly, orientated to explain the pattern of phenotypic frequencies as a consequence of external selective mechanisms. For a better understanding of this special case and other...

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Monthly visits were conducted from July 2007 to April 2008 to the Protected Area "Reserva Paisajística Nor-Yauyos Cochas" and its buffer zone, to record all the seen and/or heard birds. I managed to identify 102 species corresponding to 32 families and 14 orders; 3 are migratory and 10 are endemic. The threatened species (in Peruvian and/or interna...