scholarly journals The Role of Sibling Competition and Parental Provisioning on Food Distribution among Ferruginous Hawk Nestlings

2020 ◽  
Vol 54 (4) ◽  
Author(s):  
Megan C. Szojka ◽  
Erin M. Bayne ◽  
Troy I. Wellicome ◽  
Cameron J. Nordell ◽  
Janet W. Ng
Keyword(s):  
Food Distribution ◽  
Sibling Competition ◽  
Parental Provisioning

scholarly journals Reproductive Success of American Kestrels: The Role of Prey Abundance and Weather

The Condor ◽  
2000 ◽  
Vol 102 (4) ◽  
pp. 814-822 ◽  
Author(s):  
Russell D. Dawson ◽  
Gary R. Bortolotti
Keyword(s):  
Reproductive Success ◽  
Natural Variation ◽  
Weather Conditions ◽  
Prey Abundance ◽  
Offspring Size ◽  
Minimum Threshold ◽  
Provisioning Behavior ◽  
American Kestrels ◽  
Parental Provisioning

Abstract We investigated how natural variation in abundance and availability of the main prey of American Kestrels (Falco sparverius), small mammals, influenced provisioning rates by parents, and offspring size and survival. Provisioning behavior of kestrels was not constrained by the abundance of food in the environment; however, the availability of food, mediated through variation in weather, appeared to significantly influence parental provisioning behavior. Moreover, variation in weather had clear effects on reproductive success because nestlings exposed to inclement weather were smaller and lighter at fledging, and less likely to survive to fledging, compared to nestlings raised during good weather conditions. Prey abundance was not related to offspring size or survival. Our results suggest American Kestrels are limited by the availability, as opposed to abundance, of food on territories. It is likely that during our study, prey abundance was above some minimum threshold necessary to support successful reproduction, and so variation in weather affected reproduction more than variation in prey abundance.

The role of food gateways at increasing access to alternative retail food outlets

2019 ◽  
Vol 9 (5) ◽  
pp. 884-887 ◽  
Author(s):  
Elizabeth R Paré ◽  
Katherine Body ◽  
Sarah Gilstorf ◽  
Jennifer Lucarelli
Keyword(s):  
Vulnerable Populations ◽  
Food Distribution ◽  
Food Outlets ◽  
Retail Food ◽  
Improve Access

“Food gateways”, or individuals providing transportation, food distribution, and advocacy, can improve access to alternative retail food outlets for vulnerable populations.

Role of Sibling Aggression in Food Distribution to Nestling Cattle Egrets (Bubulcus Ibis)

The Auk ◽  
1986 ◽  
Vol 103 (4) ◽  
pp. 768-776 ◽  
Author(s):  
Bonnie J. Ploger ◽  
Douglas W. Mock
Keyword(s):  
Bird Species ◽  
Food Distribution ◽  
Sibling Aggression ◽  
Bubulcus Ibis ◽  
Main Effect ◽  
Ultimate Cause ◽  
Access To Food

Abstract Sibling aggression occurs in a wide variety of asynchronously hatching bird species. In some, fights among siblings lead inevitably to death, in which case the benefits of winning are clear. In species where sibling aggression is common but usually not fatal, the benefits gained by winning and the methods used to achieve them are less obvious. In a Texas colony of Cattle Egrets (Bubulcus ibis), sibling aggression was frequent but siblicide rare. Parents rarely interfered with fights. Last-hatched chicks lost more fights and received less food than their elder siblings. Fighting limited the losers' immediate access to food and contributed to the senior sib's ability to monopolize boluses. These results are consistent with the hypothesis that monopolizable food can act as both a proximate and ultimate cause of sibling aggression. The main effect of sibling aggression lay in depressing food supplies to last-hatched chicks. First- and second-hatched sibs accrued roughly equal feeding advantages.

scholarly journals Group provisioning limits sharing conflict among nestlings in joint-nesting Taiwan yuhinas

2010 ◽  
Vol 6 (3) ◽  
pp. 318-321 ◽  
Author(s):  
Sheng-Feng Shen ◽  
Hsueh-Chen Chen ◽  
Sandra L. Vehrencamp ◽  
Hsiao-Wei Yuan
Keyword(s):  
Cooperative Breeding ◽  
Video Recording ◽  
Food Delivery ◽  
Food Distribution ◽  
Sibling Competition ◽  
Short Intervals ◽  
Food Allocation ◽  
Adult Feeding ◽  
Large Party ◽  
Nestling Begging

Offspring often compete over limited available resources. Such sibling competition may be detrimental to parents both because it entails wasted expenditure and because it allows stronger offspring to obtain a disproportionate share of resources. We studied nestling conflict over food and its resolution in a joint-nesting species of bird, the Taiwan yuhina ( Yuhina brunneiceps ). We show that adult yuhinas coordinate their feeding visits, and that this coordination limits competition among nestlings, leading to a ‘fairer’ division of resources. Transponder identification and video-recording systems were used to observe adult feeding and nestling begging behaviours. We found that: (i) yuhinas feed nestlings more often in large parties than in small parties; (ii) feeding events occurred non-randomly in bouts of very short intervals; and (iii) food distribution among nestlings was more evenly distributed, and fewer nestlings begged, during large-party feeding bouts compared with small-party feeding bouts. To our knowledge, this is the first study in a cooperative breeding species showing that adults can influence food allocation and competition among nestlings by coordinating their feeding visits. Our results confirm the hypothesis that the monopolizability of food affects the intensity of sibling competition, and highlight the importance of understanding the temporal strategies of food delivery.

Role of begging and sibling competition in foraging strategies of nestlings

2001 ◽  
Vol 61 (4) ◽  
pp. 733-745 ◽  
Author(s):  
Miguel A. Rodrı́guez-Gironés ◽  
Magnus Enquist ◽  
Michael Lachmann
Keyword(s):  
Sibling Competition ◽  
Foraging Strategies

scholarly journals Evolution of Radio Frequency Identification (RFID) in Agricultural Cold Chain Monitoring: A Literature Review

2019 ◽  
Vol 11 (3) ◽  
pp. 43
Author(s):  
Bahareh Mosadegh Sedghy
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Temperature Monitoring ◽  
Food Distribution ◽  
Agricultural Products ◽  
Cold Chain ◽  
Practical Implementation ◽  
The Past ◽  
Frequency Identification

Radio Frequency Identification (RFID) is a technology providing considerable opportunities to improve quality control for perishable foods. Over the past decade, a significant improvement in RFID application has been observed in cold chain monitoring. The aim of this paper is to, first, demonstrate the role of RFID in improving the monitoring of the agricultural products cold chain. Particular focus is placed on the specifications of RFID and its advantages, which makes its application appealing in food temperature monitoring. Second, this paper aims to provide an overview of RFID developments in cold chain monitoring. For this purpose, we conduct a review of the literature throughout 2004-2018 citing the challenges of this technology’s practical implementation in temperature monitoring of perishables, and provide the solutions presented in the literature for each limitation. This survey would be beneficial for those involved in food distribution, as it offers approaches for overcoming the limitations of RFID, making its application more advantageous.

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