scholarly journals Fitness increases with partner and neighbour allopreening

2007 ◽  
Vol 3 (4) ◽  
pp. 386-389 ◽  
Author(s):  
Sue Lewis ◽  
Gilbert Roberts ◽  
Mike P Harris ◽  
Carina Prigmore ◽  
Sarah Wanless
Keyword(s):  
Breeding Success ◽  
Negative Relationship ◽  
Uria Aalge ◽  
Social Functions ◽  
Common Guillemot ◽  
Breeding Failure ◽  
Animal Societies

Altruism and selfishness are fundamental characteristics of human and animal societies. Among colonial biparental species, breeding outcome depends on interactions between mates and neighbours. However, the relationships between cooperation within and among partnerships and fitness have not been fully investigated. We show that in the highly colonial common guillemot ( Uria aalge ), altruistic behaviour (allopreening) towards a mate was positively related to long-term fitness, whereas allopreening a neighbour was related to current fitness. Turnover is much lower within than between pairs, so our results suggest that allopreening within pairs generates fitness returns at longer timescales than between pairs. Allopreening not only removes ectoparasites and maintains plumage condition, but may also have important social functions. We found a negative relationship between fight rate and allopreen rate between breeding neighbours, with nests exhibiting low breeding success having a higher frequency of fights with neighbours. We also found evidence for reciprocity in allopreening. Thus, allopreening may function as a reciprocal stress reducer, to decrease the likelihood of fights and associated breeding failure. We suggest that altruistic behaviour has long-term benefits for the survival of the offspring when living in a crowded neighbourhood.

Mortality and breeding failure of little penguins, Eudyptula minor, in Victoria, 1995 - 96, following a widespread mortality of pilchard, Sardinops sagax

2000 ◽  
Vol 51 (4) ◽  
pp. 355 ◽  
Author(s):  
Peter Dann ◽  
F. I. Norman ◽  
J. M. Cullen ◽  
F. J. Neira ◽  
A. Chiaradia
Keyword(s):  
At Risk ◽  
Breeding Season ◽  
Breeding Success ◽  
Egg Laying ◽  
First Year ◽  
Breeding Failure ◽  
Food Species ◽  
Intestinal Parasitism ◽  
Western Victoria

In May 1995, numbers of little penguins, Eudyptula minor, coming ashore declined at Phillip Island and St Kilda concurrently with deaths of many penguins in western Victoria and a massive mortality of one of their food species (pilchard) throughout southern Australia. Among 1926 dead penguins reported were 131 banded birdsrecovered from Phillip Island (86% adults and 14% first-year birds), 26 from Rabbit Island and six from St Kilda. The number of banded penguins found dead per number of adult Phillip Island birds at risk was 2.3% in 1995 compared with an annual mean of 0.7% for 1970–93. Of 29 corpses autopsied, at least 26 died of starvation associated with mild–severe gastro-intestinal parasitism. Following the pilchard mortality, egg-laying by penguins in the subsequent breeding season (1995–96) was ~2 weeks later than the long-term mean and 0.3 chicks were fledged per pair compared with the long-term mean of 1.0. Unlike previous years, few penguins were recorded in Port Phillip Bay in September–October 1995, a period when pilchard schools were infrequently seen. It is concluded that the increase in penguin mortality in northern Bass Strait and the significant reduction in breeding success were associated with the widespread pilchard mortality.

The importance of observer effort on the accuracy of breeding success estimates in the Common Guillemot Uria aalge

Bird Study ◽  
2020 ◽  
Vol 67 (1) ◽  
pp. 93-103
Author(s):  
Mike P. Harris ◽  
Martin Heubeck ◽  
Maria I. Bogdanova ◽  
Mark A. Newell ◽  
Sarah Wanless ◽  
...  
Keyword(s):  
Breeding Success ◽  
Uria Aalge ◽  
Common Guillemot ◽  
The Common

Increased adult mortality and reduced breeding success with age in a population of common guillemot Uria aalge using marked birds of unknown age

2006 ◽  
Vol 37 (3) ◽  
pp. 273-282 ◽  
Author(s):  
Laurent Crespin ◽  
Michael P. Harris ◽  
Jean-Dominique Lebreton ◽  
Sarah Wanless
Keyword(s):  
Breeding Success ◽  
Adult Mortality ◽  
Uria Aalge ◽  
Common Guillemot

Risk Attitude and Corporate Investment under Output Market Uncertainty: Evidence from The Mekong River Delta, Vietnam

2016 ◽  
pp. 59-70
Author(s):  
Ninh Le Khuong ◽  
Nghiem Le Tan ◽  
Tho Huynh Huu
Keyword(s):  
Negative Relationship ◽  
Risk Attitude ◽  
Business Strategies ◽  
Risk Averse ◽  
Market Uncertainty ◽  
Firm Investment ◽  
Output Market ◽  
The Impact ◽  
The Relationship

This paper aims to detect the impact of firm managers’ risk attitude on the relationship between the degree of output market uncertainty and firm investment. The findings show that there is a negative relationship between these two aspects for risk-averse managers while there is a positive relationship for risk-loving ones, since they have different utility functions. Based on the findings, this paper proposes recommendations for firm managers to take into account when making investment decisions and long-term business strategies as well.

scholarly journals Higher Temperatures Decrease Fruit Size in Strawberry Growing in the Subtropics

Horticulturae ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 34
Author(s):  
Christopher Menzel
Keyword(s):  
Fruit Size ◽  
Negative Relationship ◽  
Titratable Acidity ◽  
Fruit Weight ◽  
Soluble Solids ◽  
Marketable Yield ◽  
Significant Relationships ◽  
Small Fruit ◽  
Solids Content

Five strawberry (Fragaria × ananassa Duch.) cultivars were grown in Queensland, Australia to determine whether higher temperatures affect production. Transplants were planted on 29 April and data collected on growth, marketable yield, fruit weight and the incidence of small fruit less than 12 g until 28 October. Additional data were collected on fruit soluble solids content (SSC) and titratable acidity (TA) from 16 September to 28 October. Minimum temperatures were 2 °C to 4 °C higher than the long-term averages from 1965 to 1990. Changes in marketable yield followed a dose-logistic pattern (p < 0.001, R2s = 0.99). There was a strong negative relationship between fruit weight (marketable) and the average daily mean temperature in the four or seven weeks before harvest from 29 July to 28 October (p < 0.001, R2s = 0.90). There were no significant relationships between SSC and TA, and temperatures in the eight days before harvest from 16 September to 28 October (p > 0.05). The plants continued to produce a marketable crop towards the end of the season, but the fruit were small and more expensive to harvest. Higher temperatures in the future are likely to affect the economics of strawberry production in subtropical locations.

Aspiring to Do All Things Through Him Who Strengthens? Quixotic Hope, Religiosity, and Mental Health in Emerging Adulthood

2021 ◽  
pp. 215686932110085
Author(s):  
Laura Upenieks
Keyword(s):  
Mental Health ◽  
Negative Relationship ◽  
Well Being ◽  
Educational Expectations ◽  
Religious Practice ◽  
The United States ◽  
Religious Attendance ◽  
National Study ◽  
Health Consequences

Beliefs about the probability of educational success tend to be very optimistic in the United States. However, scholars are beginning to uncover mental health consequences associated with quixotic hope—the unrealistic outstripping of expectation by aspiration. Using longitudinal data from Waves 1 and 3 of the National Study of Youth and Religion, this study asks, (1) does religiosity promote or diminish the likelihood of quixotic hope? and (2) does religious attendance and closeness to God mitigate long-term mental health consequences of quixotic hope? Results show that weekly religious attendance had a modest negative relationship with the likelihood of experiencing quixotic hope, while increasing religious attendance over time attenuated the negative mental health consequences of quixotic hope on increases in depression. Closeness to God neither predicted quixotic hope nor played a moderating role for depression. As educational expectations rise, regular religious practice may help protect the emotional well-being of youth.

scholarly journals Productivity of Ospreys, Pandion haliaetus, Affected by Water Levels Near Loon Lake, Saskatchewan, 1975-2002

2010 ◽  
Vol 124 (3) ◽  
pp. 219
Author(s):  
C. Stuart Houston ◽  
Frank Scott ◽  
Rob B. Tether
Keyword(s):  
Breeding Success ◽  
Water Levels ◽  
Lake Levels ◽  
The West ◽  
Canadian Data ◽  
Human Use ◽  
The Town ◽  
Western Half ◽  
Eastern Half

Between 1975 and 2002, diminished breeding success of Ospreys was associated with drought and falling lake levels in the western half of our study area near the town of Loon Lake, west-central Saskatchewan. Only 46% of nest attempts were successful in the west compared to 72% in the east, producing 0.88 young per accessible nest in the west and 1.42 in the east. Breeding success was greater in the eastern half, where water levels were stable, in spite of increased human use of the resort lakes there. Our unique long-term Canadian data base results support Ogden's 1977 prediction that Osprey productivity may decrease when water levels drop and fish populations are reduced.

Sign in / Sign up

Export Citation Format

Share Document