Visual cues do not increase artificial nest predation in a Brazilian tropical savanna

2021 ◽  
Author(s):  
Paulo Victor Resende dos Santos ◽  
Ingrid Pinheiro Paschoaletto ◽  
Lia Nahomi Kajiki ◽  
Mariana de-Carvalho ◽  
Samara de Albuquerque Teixeira
Keyword(s):  
Nest Predation ◽  
Visual Cues ◽  
Tropical Savanna ◽  
Artificial Nest

Predation of artificial ground nests in Australian tropical savannas: inverse edge effects

2005 ◽  
Vol 32 (4) ◽  
pp. 313 ◽  
Author(s):  
Fiona J. Fraser ◽  
Peter J. Whitehead
Keyword(s):  
Nest Predation ◽  
National Park ◽  
Tropical Savanna ◽  
Northern Australia ◽  
Artificial Nest ◽  
Tropical Savannas ◽  
Artificial Nests ◽  
Predator Identity ◽  
High Diversity ◽  
Predation Rates

Depredation of artificial ground nests was examined in tropical savanna in northern Australia to assess potential predation pressures on nests of the partridge pigeon (Geophaps smithii), a declining tropical granivore. Predation rates were examined at two sites, Kakadu National Park (which supported a relatively high density of partridge pigeons) and Berry Springs (which had greater habitat fragmentation and comparatively low partridge pigeon density). The effects of distance from road, understorey structure, topography and nest-microsite concealment on nest predation rates were examined. Artificial-nest predation rates were greater at 150 m from roads than <1 m from the roadside. Predation rates did not vary with understorey structure, topography, or level of nest concealment. There was marked variation between sites, with predation levels at Kakadu more than double those recorded for Berry Springs. Discerning predator identity, or even the size of a predator, from marks left in clay eggs proved difficult and was possible for ~35% of predation events. Of these, 42% of predation events involved predators of a size we considered too small to take a natural partridge pigeon nest. We suggest that extrapolation from artificial to natural ground-nest predation rates be undertaken with caution for landscapes such as Australia’s tropical savanna, which supports a high diversity and abundance of small potential predators of artificial nests. There was no evidence of predation by birds, and the methodology proved inadequate for identifying predation by feral cats (Felis catus).

Artificial nest predation along a Neotropical urban gradient

2009 ◽  
Vol 92 (2) ◽  
pp. 90-95 ◽  
Author(s):  
Víctor López-Flores ◽  
Ian MacGregor-Fors ◽  
Jorge E. Schondube
Keyword(s):  
Nest Predation ◽  
Urban Gradient ◽  
Artificial Nest

Predation on different-sized quail eggs in an artificial-nest study in western Newfoundland

1999 ◽  
Vol 77 (7) ◽  
pp. 1170-1173 ◽  
Author(s):  
Keith P Lewis ◽  
William A Montevecchi
Keyword(s):  
Japanese Quail ◽  
Small Mammals ◽  
Nest Predation ◽  
Egg Size ◽  
Tamiasciurus Hudsonicus ◽  
Buffer Strips ◽  
Artificial Nest ◽  
Red Squirrels ◽  
Artificial Nests ◽  
Riparian Buffer Strips

In artificial-nest studies, Japanese Quail (Coturnix japonica) eggs have been used as surrogates for passerine eggs, although small mammals that prey on passerine eggs may be unable to consume Japanese Quail eggs. To determine the influence of egg size on nest predation in different landscapes on insular Newfoundland, we placed either a Japanese Quail egg or a smaller Chinese Painted Quail (Xexcalfactoris chinensis) egg in artificial ground nests along lakeshore forest edges and along riparian buffer strips. Clay eggs were used to identify nest predators. Levels of predation on nests with Japanese Quail and Chinese Painted Quail eggs were similar. Based on clay eggs, predation was attributed to red squirrels (Tamiasciurus hudsonicus), and we found no evidence that smaller mammals preyed on artificial nests. We conclude that the Japanese Quail egg is acceptable for use in artificial-nest studies in Newfoundland, and we discuss the implications of egg size and small mammals in nest-predation experiments.

Habitat edges affect patterns of artificial nest predation along a wetland-meadow boundary

2014 ◽  
Vol 59 ◽  
pp. 91-96 ◽  
Author(s):  
Petr Suvorov ◽  
Jana Svobodová ◽  
Tomáš Albrecht
Keyword(s):  
Nest Predation ◽  
Artificial Nest

Artificial nest predation rates vary among habitats in the Australian monsoon tropics

2007 ◽  
Vol 23 (3) ◽  
pp. 519-527 ◽  
Author(s):  
Richard A. Noske ◽  
Sarah Fischer ◽  
Barry W. Brook
Keyword(s):  
Nest Predation ◽  
Artificial Nest ◽  
Australian Monsoon ◽  
Predation Rates

scholarly journals Nestling begging calls increase predation risk by corvids

2019 ◽  
Vol 69 (2) ◽  
pp. 137-155
Author(s):  
Magne Husby
Keyword(s):  
Nest Predation ◽  
Predation Rate ◽  
Artificial Nest ◽  
Auditory Cues ◽  
Artificial Nests ◽  
Breeding Failure ◽  
Nestling Begging ◽  
Real Costs ◽  
Insight Into ◽  
Nest Predators

Abstract Despite nest predation being the most common cause of breeding failure in open-nesting birds, we have little insight into the cues used by nest predators when they search for nests. So far we have assumed that nest-predating birds are visually oriented while mammal predators to a large extent use scent and auditory cues like nestling begging calls. To evaluate how important nestling begging calls are for corvid nest predators searching for nests, I used artificial nests, which made it possible to find the real costs of the begging without mitigation by parental and nestling behavior. I used paired artificial nests, one with and one without nestling begging call playback. Within 10 days, 62.9% of the nests were predated. The analyses showed that nests with begging calls suffered a significantly higher predation rate than nests without begging calls, especially when the nests were placed close to corvid nests. Moreover, nests with begging calls were predated significantly earlier than nests without begging calls. In artificial nest pairs with both nests predated but on different days, nests with begging calls were predated first. In nest pairs with only one predated nest, nests with begging calls were predated most often. This experiment shows that nestling begging calls imply a cost in terms of increased and earlier nest predation, and that corvids use nestling begging calls as a cue to find and depredate bird nests, challenging earlier expectations.

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