Food supplementation and predation risk in harsh climate: interactive effects on abundance and body condition of tit species

Oikos ◽  
2016 ◽  
Vol 126 (6) ◽  
pp. 863-873 ◽  
Author(s):  
Chiara Morosinotto ◽  
Alexandre Villers ◽  
Rauno Varjonen ◽  
Erkki Korpimäki
Keyword(s):  
Predation Risk ◽  
Body Condition ◽  
Interactive Effects ◽  
Food Supplementation ◽  
Harsh Climate

scholarly journals Glucocorticoids, state-dependent reproductive investment and success in the face of danger in a long-lived bird

2020 ◽  
Author(s):  
Kristina Noreikienė ◽  
Kim Jaatinen ◽  
Benjamin B. Steele ◽  
Markus Öst
Keyword(s):  
Predation Risk ◽  
Telomere Length ◽  
Clutch Size ◽  
Body Condition ◽  
Nest Predation ◽  
Hatching Success ◽  
Reproductive Investment ◽  
Trade Off ◽  
Relative Telomere Length ◽  
Future Reproduction

AbstractGlucocorticoid hormones may mediate trade-offs between current and future reproduction. However, understanding their role is complicated by predation risk, which simultaneously affects the value of the current reproductive investment and elevates glucocorticoid levels. Here, we shed light on these issues in long-lived female Eiders (Somateria mollissima) by investigating how current reproductive investment (clutch size) and hatching success relate to faecal glucocorticoid metabolite [fGCM] level and residual reproductive value (minimum years of breeding experience, body condition, relative telomere length) under spatially variable predation risk. Our results showed a positive relationship between colony-specific predation risk and mean colony-specific fGCM levels. Clutch size and female fGCM were negatively correlated only under high nest predation and in females in good body condition, previously shown to have a longer life expectancy. We also found that younger females with longer telomeres had smaller clutches. The drop in hatching success with increasing fGCM levels was least pronounced under high nest predation risk, suggesting that elevated fGCM levels may allow females to ensure some reproductive success under such conditions. Hatching success was positively associated with female body condition, with relative telomere length, particularly in younger females, and with female minimum age, particularly under low predation risk, showing the utility of these metrics as indicators of individual quality. In line with a trade-off between current and future reproduction, our results show that high potential for future breeding prospects and increased predation risk shift the balance toward investment in future reproduction, with glucocorticoids playing a role in the resolution of this trade-off.

scholarly journals Food supplementation by an invasive fleshy‐fruited shrub sustains body condition of a native frugivorous bird during winter

2019 ◽  
Vol 14 (3) ◽  
pp. 259-269 ◽  
Author(s):  
Tobias Nicolas ROJAS ◽  
David Lautaro VERGARA‐TABARES ◽  
Diego Javier VALDEZ ◽  
Marina Flavia PONZIO ◽  
Susana Inés PELUC
Keyword(s):  
Body Condition ◽  
Food Supplementation ◽  
Frugivorous Bird

The impact of botfly parasitism on the health of the gracile mouse opossum (Gracilinanus agilis)

Parasitology ◽  
2019 ◽  
Vol 146 (8) ◽  
pp. 1013-1021
Author(s):  
Priscilla Lóra Zangrandi ◽  
André Faria Mendonça ◽  
Ariovaldo Pereira Cruz-Neto ◽  
Rudy Boonstra ◽  
Emerson M. Vieira
Keyword(s):  
Relative Humidity ◽  
Body Condition ◽  
Animal Health ◽  
Haemoglobin Concentration ◽  
Blood Parameters ◽  
Small Population ◽  
Maximum Temperature ◽  
Food Supplementation ◽  
Local Extinctions ◽  
The Impact

AbstractFragmented habitats generally harbour small populations that are potentially more prone to local extinctions caused by biotic factors such as parasites. We evaluated the effects of botflies (Cuterebra apicalis) on naturally fragmented populations of the gracile mouse opossum (Gracilinanus agilis). We examined how sex, food supplementation experiment, season and daily climatic variables affected body condition and haemoglobin concentration in animals that were parasitized or not by botflies. Although parasitism did not affect body condition, haemoglobin concentrations were lower in parasitized animals. Among the non-parasitized individuals, haemoglobin concentration increased with the increase of maximum temperature and the decrease of relative humidity, a climatic pattern found at the peak of the dry season. However, among parasitized animals, the opposite relationship between haemoglobin concentration and relative humidity occurred, as a consequence of parasite-induced anaemia interacting with dehydration as an additional stressor. We conclude that it is critical to assess how climate affects animal health (through blood parameters) to understand the population consequences of parasitism on the survival of individuals and hence of small population viability.

scholarly journals Interactive effects of reproductive assets and ambient predation risk on the threat-sensitive decisions of Trinidadian guppies

2016 ◽  
Vol 62 (3) ◽  
pp. 221-226 ◽  
Author(s):  
Jemma Katwaroo-Andersen ◽  
Chris K. Elvidge ◽  
Indar Ramnarine ◽  
Grant E. Brown
Keyword(s):  
Predation Risk ◽  
Interactive Effects

Food supplementation, but not predation risk, alters female antioxidant status during breeding

2017 ◽  
Vol 71 (4) ◽  
Author(s):  
Suvi Ruuskanen ◽  
Chiara Morosinotto ◽  
Robert L. Thomson ◽  
Chaminda Pradeep Ratnayake ◽  
Erkki Korpimäki
Keyword(s):  
Predation Risk ◽  
Antioxidant Status ◽  
Food Supplementation

Interactive Effects of Food Supplementation and Snake Fungal Disease on Pregnant Pygmy Rattlesnakes and Their Offspring

2019 ◽  
Vol 53 (4) ◽  
pp. 282 ◽  
Author(s):  
Craig M. Lind ◽  
Amber Clark ◽  
Sarah A. Smiley-Walters ◽  
Daniel R. Taylor ◽  
Marcos Isidoro-Ayza ◽  
...  
Keyword(s):  
Fungal Disease ◽  
Interactive Effects ◽  
Food Supplementation ◽  
Snake Fungal Disease

Body Condition Parameters of Nestling Great TitsParus majorin Relation to Experimental Food Supplementation

2011 ◽  
Vol 46 (2) ◽  
pp. 207-212 ◽  
Author(s):  
Jerzy Bańbura ◽  
Mirosława Bańbura ◽  
Michał Glądalski ◽  
Adam Kaliński ◽  
Marcin Markowski ◽  
...  
Keyword(s):  
Body Condition ◽  
Food Supplementation

scholarly journals The interactive effects of competition and predation risk on dispersal in an insect

2014 ◽  
Vol 10 (6) ◽  
pp. 20140287 ◽  
Author(s):  
Celina B. Baines ◽  
Shannon J. McCauley ◽  
Locke Rowe
Keyword(s):  
Predation Risk ◽  
Intraspecific Competition ◽  
Aquatic Insects ◽  
Ecological Factors ◽  
Factorial Experiment ◽  
Interactive Effects ◽  
Factorial Experiments ◽  
Evolutionary Processes ◽  
Factors Affecting ◽  
Ecological Conditions

Dispersal dynamics have significant consequences for ecological and evolutionary processes. Previous work has demonstrated that dispersal can be context-dependent. However, factors affecting dispersal are typically considered in isolation, despite the probability that individuals make dispersal decisions in response to multiple, possibly interacting factors. We examined whether two ecological factors, predation risk and intraspecific competition, have interactive effects on dispersal dynamics. We performed a factorial experiment in mesocosms using backswimmers ( Notonecta undulata ), flight-capable, semi-aquatic insects. Emigration rates increased with density, and increased with predation risk at intermediate densities; however, predation had minimal effects on emigration at high and low densities. Our results indicate that factorial experiments may be required to understand dispersal dynamics under realistic ecological conditions.

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