Is multiple nest building an adequate strategy to cope with inter-species nest usurpation?

Sumasgutner, Petra; Millán, Juan Martínez San; Curtis, Odette E.; Koelsag, Ann; Amar, Arjun

doi:10.1186/s12862-016-0671-7

Cited by 32 publications

(24 citation statements)

References 52 publications

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“…Thus, the mechanism for the differential seasonal decline may not be food related, since prey abundance would be expected to impact brood sizes rather than to induce complete nest failures. Alternatively, we know from other studies that one of the main causes of nest failure in this black sparrowhawks is nest usurpation by Egyptian geese (Alopochen aegyptiaca, Curtis et al, 2007) and that this increases later in the breeding season (Sumasgutner et al, 2016a). Thus it may be that usurpation in more prevalent in more urbanized areas, since both species have recently expanded their South African range into the urban and suburban habitats of Cape Town (see Mangnall and Crowe, 2002 on Egyptian geese).…”

Section: Discussionmentioning

confidence: 95%

“…Thus it may be that usurpation in more prevalent in more urbanized areas, since both species have recently expanded their South African range into the urban and suburban habitats of Cape Town (see Mangnall and Crowe, 2002 on Egyptian geese). This might further explain the significantly lower breeding success in more urbanized habitats later in the season, since the breeding season of Egyptian geese peaks later in the year (MacLean, 1997;Carboneras and Kirwan, 2016); when also the threat of nest usurpation increases (Sumasgutner et al, 2016a).…”

Section: Discussionmentioning

confidence: 99%

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Does Seasonal Decline in Breeding Performance Differ for an African Raptor across an Urbanization Gradient?

et al. 2017

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As human populations have increased globally, so too has the transformation of natural landscapes into more urban areas. Within Africa, population growth rates and urbanization rates are amongst the highest in the world, but the impacts of these processes on Africa's wildlife are largely un-explored. In this study, we focus on a recently established population of black sparrowhawks Accipiter melanoleucus in Cape Town, South Africa. Using long-term data (16 years), we investigate the relationship between the timing of breeding and breeding performance along an urban-rural habitat gradient. We found no evidence for a direct effect of urbanization on either timing of breeding or breeding performance. However, we did find some evidence for a differential seasonal decline in breeding performance dependent on the levels of urbanization. Thus, higher productivity was found in more urbanized habitats earlier in the season, but towards the end of the breeding season, birds in less urbanized habitats performed better. Our study represents one of the first to examine avian productivity in relation to urbanization in Africa, and also represents one of the first studies to suggest that seasonal declines in productivity may differ according to levels of urbanization. These results have considerable implications for potential changes in phenology or productivity for the regions' avifauna as African urbanization continues.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Does Seasonal Decline in Breeding Performance Differ for an African Raptor across an Urbanization Gradient?

et al. 2017

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“…Another intriguing explanation documented for a species of bird ( Accipiter melanoleucus ) is that multiple‐nest building is a passive strategy to deal with nest usurpation by other aggressive species (Sumasgutner et al . ). Tent‐making bats may have to deal with roost usurpation by other species of bats that roost in tents but do not build them.…”

Section: Discussionmentioning

confidence: 97%

“…Reducing flea infestations has been proposed as an explanation for constant roost-nest relocation in a species of bird (Cinnycerthia olivascens; Kattan et al 2013). Another intriguing explanation documented for a species of bird (Accipiter melanoleucus) is that multiple-nest building is a passive strategy to deal with nest usurpation by other aggressive species (Sumasgutner et al 2016). Tent-making bats may have to deal with roost usurpation by other species of bats that roost in tents but do not build them.…”

Section: Discussionmentioning

confidence: 99%

The dynamics of tent‐roosts in the palm Sabal mauritiiformis and their use by bats in a montane dry forest

et al. 2018

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Tent‐making bats modify leaves to build refuges. Leaf modification involves energetic and defense costs that should be balanced by the benefits of tent‐roosting. The alteration of the leaf's vascular system reduces the tent's life expectancy, so to obtain a benefit, bats are expected to use tents regularly as long as they remain functional and not modify more leaves than necessary. Over 2 yr, we documented the dynamics of tent construction and use by Uroderma convexum and other bat species in the palm Sabal mauritiiformis in a Colombian transitional dry forest. We also assessed tent condition and compared it to nonmodified leaves of approximately the same age in focal palms. Probability of tent use by U. convexum varied between 57 percent during a reproductive period and 4 percent outside of this period. Bats cut the main vein of folioles, partially affecting water transport in the leaf. However, there were no differences between tents and nonmodified leaves in deterioration scores or deterioration rates over 1 yr. During 2 yr, 48 tents were lost for different causes, but this loss was balanced by the construction of 51 new tents. Thus, bats maintained an excess of usable tents. Palm leaves are long‐lived and seem preadapted to sustain damage and remain viable, particularly in species growing in dry environments. We present several hypotheses to explain the advantage of maintaining a tent surplus.

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“…several data for each replication (individuals, sites, etc. ), by the use of one or several random grouping factor(s) (Bates, 2005;Cook et al, 2013;Hurlbert, 1984;Millar and Anderson, 2004;Sumasgutner et al, 2016;Zuur et al, 2009). Site (nested within habitat) and individual (nested within site) were included as random grouping factorsto control for pseudo-replication (Bates, 2005;Hurlbert, 1984;Zuur et al, 2009).…”

Section: Secondary Dispersal -mentioning

confidence: 99%

Diaspore heteromorphism in the invasive Bromus tectorum L. (Poaceae): Sterile florets increase dispersal propensity and distance

Monty

Maebe

Mahy

et al. 2016

Flora

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Please cite this article as: Monty, Arnaud, Maebe, Laura, Mahy, Grégory, Brown, Cynthia S., Diaspore heteromorphism in the invasive Bromus tectorum L.(Poaceae): sterile florets increase dispersal propensity and distance.Flora http://dx.doi.org/10.1016/j.flora. 2016.06.004 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.  Bromus tectorum is a troublesome invasive grass in North America.  The sterility of terminal florets induces a diaspore heteromorphism.  Dispersal of diaspores with and without sterile florets attached was investigated.  Primary and secondary dispersal by biotic and abiotic agents were considered.  Across the study, diaspores with sterile florets were better dispersers. 2 AbstractWithin a species, the distance travelled by a particular diaspore depends on its morphology. In Poaceae, the presence of terminal sterile florets can lead to diaspore heteromorphism, which may influence dispersal. We tested the hypothesis that the presence of sterile florets favored dispersal in Bromus tectorum L., an invasive grass in the Western US.We used field and controlled experiments to study the dispersal of caryopses with and without sterile florets attached (respectively complex and simple diaspores), as well as pieces of inflorescence that detached from the mother plants. We considered both primary and secondary dispersal, as well as abiotic and biotic dispersal agents. The distance travelled by the diaspores and their attachment to animal fur were related to the presence and number of sterile florets.Abiotic agents moved diaspores over relatively short distances, both in terms of primary and secondary dispersal. A significant proportion of diaspores attached to fur, suggesting a potential for dispersal over longdistances. Complex diaspores were better dispersers than simple ones (and pieces of inflorescence), and this pattern was consistent across the study. However, among complex diaspores, the number of sterile florets had little or no influence.Considering primary and secondary dispersal by abiotic and biotic agents provided a general picture of the dispersal ecology of B. tectorum. For all the dispersal steps and dispersal agents we studied, the presence of sterile florets favored dispersal. These results highlight the functional significance of diaspore heteromorphism induced by floret sterility in the dispersal of Poaceae.

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Is multiple nest building an adequate strategy to cope with inter-species nest usurpation?

Cited by 32 publications

References 52 publications

Does Seasonal Decline in Breeding Performance Differ for an African Raptor across an Urbanization Gradient?

Does Seasonal Decline in Breeding Performance Differ for an African Raptor across an Urbanization Gradient?

The dynamics of tent‐roosts in the palm Sabal mauritiiformis and their use by bats in a montane dry forest

Diaspore heteromorphism in the invasive Bromus tectorum L. (Poaceae): Sterile florets increase dispersal propensity and distance

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