Relationships among territory size, body size, and food availability in a specialist river duck

Ippi, Silvina; Cerón, Gerardo; Álvarez, Leandro M.; Aráoz, Rodrigo; Blendinger, Pedro G.

doi:10.1080/01584197.2018.1438848

Cited by 11 publications

(7 citation statements)

References 37 publications

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“…Plot (b) shows the relationship between mass and elevational responses to yearly mean temperature. Plot (c) shows the relationship between diet breadth and elevational responses to yearly total precipitation Aráoz, & Blendinger, 2018). Yet, these explanations would still be indirect effects of temperature (Ferger et al, 2014), and elsewhere, temperature has not been identified as a direct constraint on the range limits of tropical birds (Freeman, 2016;Londoño et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…For example, increased temperatures could lead to the gain of invertebrates from lower elevations (Colwell et al, 2008), providing additional foraging opportunities to insectivorous birds, beyond their usual realized niche (Jankowski et al, 2012). Conversely, increased temperatures could lower food availability for specialists, forcing populations to expand to find more food (Ippi, Cerón, Alvarez, Aráoz, & Blendinger, 2018). Yet, these explanations would still be indirect effects of temperature (Ferger et al, 2014), and elsewhere, temperature has not been identified as a direct constraint on the range limits of tropical birds (Freeman, 2016; Londoño et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

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A disconnect between upslope shifts and climate change in an Afrotropical bird community

Neate‐Clegg

O’Brien

Mulindahabi

et al. 2020

Conservat Sci and Prac

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Climate change threatens to push species to higher elevations and eventual extinction. Birds, in particular, are shown to be shifting upslope in the Neotropics and Southeast Asia. Yet previous studies have lacked the temporal resolution to investigate distributional dynamics over time in relation to climatic fluctuations, especially in the understudied Afrotropics. Here, we used 15 years of point-count data from across an elevational gradient (1,767-2,940 m) in Rwanda, to assess elevational shift rates and dynamics in a community of Afrotropical birds. In general, species shifted their elevations upslope by 1.9 m/year, especially at their lower elevational limits which shifted by 4.4 m/year. Importantly, these shifts occurred despite the fact that local temperature and precipitation showed little trend over the study period. Moreover, the interannual distributions of few species were associated with temperature, suggesting that temperature played little direct role in determining elevational distributions of birds. Instead, upslope shifts may be more related to incremental shifts in habitat and resources which lag behind decades of increased temperature in the region. Precipitation appeared to have more of an effect than temperature in determining interannual elevational changes, allowing species to expand their ranges in years of higher rainfall. Our results highlight the need to understand the mechanisms driving upslope shifts as they occur throughout the tropics. It will be critical for montane regions of the tropics to preserve contiguous blocks of forest across elevational gradients to allow wildlife to shift unimpeded.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

A disconnect between upslope shifts and climate change in an Afrotropical bird community

Neate‐Clegg

O’Brien

Mulindahabi

et al. 2020

Conservat Sci and Prac

View full text Add to dashboard Cite

show abstract

“…This variation could be linked to variable territory quality, which is supported by the fact that foraging success varies with habitat type (Cunningham & Castro, 2011; Dixon, 2015); habitat utilization does not reflect habitat availability (Dixon, 2015; Jamieson et al, 2016); territory size varies with the proportion of preferable habitat (Taborsky & Taborsky, 1995); nests are nonrandomly placed in relation to habitat type (Taborsky & Taborsky, 1995); and hatching success tends to be higher in tree logs compared to other, less spatially restricted, nest types (I. Castro, unpublished data; Wilson, 2014; Ziesemann, 2011). If territoriality is linked to territory quality, it can be expected to be influenced by habitat and population density, and thus differ between populations (Ippi et al, 2018; Nicola et al, 2015). However, another suggestion is that territoriality in NI brown kiwi is due to mate‐guarding by males; this hypothesis is supported by the fact that individual territoriality within populations is linked to pairing status (with unpaired birds having 2–6 times larger home ranges), males show more territorial behavior than females, and territoriality is very low in female‐biased populations (Taborsky & Taborsky, 1991, 1992, 1999).…”

Section: Species‐specific Datamentioning

confidence: 99%

Predicting breeding systems to guide conservation strategies: A kiwi example

Undin

Castro

2022

Ethology

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“…Possibly, the larger size of females is indicative of their greater competitiveness for resources (Oddie 2001). For instance, larger individuals might have an increased ability to compete for high-quality territories (Ippi et al 2018, Niederhouser et al 2021.…”

Section: Effect Of Treatments On Habitat Selection By Adult Females and Malesmentioning

confidence: 99%

Variation in song structure of house wrens living in urban and rural areas in a Caribbean small island developing state

et al. 2020

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The negative effects of anthropogenic noise on wildlife, particularly birds, have been widely studied but major gaps in scientific knowledge remain. The inequality of information available and studies conducted between the high-income countries of the Global North, and middle-and low-income countries of the Global South is limiting the applicability and implementation of conservation projects. I investigated the effects of noise in two different contexts: effects of noise from oil extraction in the North American grasslands on chestnut-collared longspurs (Calcarius ornatus) and effects of noise from urban activity in the Caribbean island of Grenada on house wrens (Troglodytes aedon). I tested whether distance from oil development, distance from infrastructure noise, brood size, and parent size and weight affected nestling sex ratio allocation in chestnut-collared longspurs. Large broods were skewed towards male nestlings, and bigger females and older social males reared more male nestlings, indicating that competitiveness and experience may be valuable traits for successful breeding and greater fitness in adults. Male nestlings were also more likely to be produced further from screwpump and silent playback treatments, suggesting that habitat farthest from anthropogenic development favours production of male nestlings. My results suggest that both biological and environmental characteristics interact to regulate sex ratio allocation in my study population. Conservation I want to thank my advisor, Nicola Koper. Nicky has let me progress and find my way through the difficulties of graduate school without judgment and helped make my experience a positive one. She believed in me as a researcher and I could not have asked more from an advisor.For their time, support, and positive attitudes, I want to thank my committee members Rachel Vallender, Margaret Docker, and Kevin Ellison. Countless people have helped me and were vital to the completion of this project. I would have no results if it wasn't for Chelsea Enslow, Erin Wieler and Arfa Khan's assistance in the lab. Thank you to all my predecessors and fellow graduate students for all the knowledge and skills you have shared with me, as well as for your friendships: Patricia Rosa,

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Relationships among territory size, body size, and food availability in a specialist river duck

Cited by 11 publications

References 37 publications

A disconnect between upslope shifts and climate change in an Afrotropical bird community

A disconnect between upslope shifts and climate change in an Afrotropical bird community

Predicting breeding systems to guide conservation strategies: A kiwi example

Variation in song structure of house wrens living in urban and rural areas in a Caribbean small island developing state

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