Survival of Western Sandpiper Broods on the Yukon-Kuskokwim Delta, Alaska

Ruthrauff, Daniel R.; McCaffery, Brian J.

doi:10.1650/0010-5422(2005)107[0597:sowsbo]2.0.co;2

Cited by 34 publications

(51 citation statements)

References 24 publications

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“…Based on the strength of this relationship, I believe this is a reasonable assumption. I also assumed this relationship was nonlinear, which was strongly supported in other studies Knopf 1993, Ruthrauff andMcCaffery 2005). My , 1995-2006.…”

Section: Juvenile Survivalsupporting

confidence: 62%

“…Using a sample of known-age chicks with body mass data spanning the chick stage (ages 1-35 days), I regressed log-transformed body mass on age and performed an analysis of variance (α = 0.05) to determine the strength of the relationship between these variables. I used a log 10 transformation of body mass because of concerns about a nonlinear relationship between mass and age Knopf 1993, Ruthrauff andMcCaffery 2005). Because I did not know the date of hatching of all chicks I handled during the study, I was unable to model a direct age effect on juvenile survival; body mass thus served as a surrogate for age, and this relationship was established using a smaller sample of known-age chicks.…”

Section: Statistical Analyses Population Modelingmentioning

confidence: 99%

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Influence of Drought on Annual Survival of the Mountain Plover in Montana

Dinsmore¹

2008

Condor

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I used a robust design to model the influence of age, sex, climate conditions, and chick body mass on the annual survival of the Mountain Plover (Charadrius montanus) in north-central Montana from [1995][1996][1997][1998][1999][2000][2001][2002][2003][2004][2005][2006]. I found evidence that chick age predicted body mass (i.e., log 10 (mass) = 0.03 × age + 1.02) and subsequently modeled juvenile survival as a function of body mass. Juvenile survival was similar for both sexes and was positively influenced by body mass at capture. The predicted annual survival for a juvenile plover from date of hatching (10 g) was 0.06 (95% CI was 0.02, 0.15) and increased with body mass. Annual survival was similar for adults of both sexes and ranged from 0.74 to 0.96 yearly. There was a hint that male survival was higher than that of females, although this effect was weak. Adult survival was affected by a Palmer Modified Drought Index that measured local climate conditions and indicated that annual survival was highest during drought periods. Implications of this study include understanding the processes influencing annual survival in a declining species, providing a basis for long-term population projections, relating demographic processes to climate change, and increasing our knowledge of survival patterns among the Charadriidae. KeywordsCharadrius montanus, drought, Montana, Mountain Plover, survival Abstract. I used a robust design to model the influence of age, sex, climate conditions, and chick body mass on the annual survival of the Mountain Plover (Charadrius montanus) in north-central Montana from 1995-2006. I found evidence that chick age predicted body mass (i.e., log 10 (mass) = 0.03 * age + 1.02) and subsequently modeled juvenile survival as a function of body mass. Juvenile survival was similar for both sexes and was positively influenced by body mass at capture. The predicted annual survival for a juvenile plover from date of hatching (10 g) was 0.06 (95% CI was 0.02, 0.15) and increased with body mass. Annual survival was similar for adults of both sexes and ranged from 0.74 to 0.96 yearly. There was a hint that male survival was higher than that of females, although this effect was weak. Adult survival was affected by a Palmer Modified Drought Index that measured local climate conditions and indicated that annual survival was highest during drought periods. Implications of this study include understanding the processes influencing annual survival in a declining species, providing a basis for long-term population projections, relating demographic processes to climate change, and increasing our knowledge of survival patterns among the Charadriidae.Key words: Charadrius montanus, drought, Montana, Mountain Plover, survival. La influencia de sequías sobre la supervivencia Charadrius montanus en MontanaResumen. Yo utilicé un diseño robusto para hacer un modelo para evaluar la influencia de edad, sexo, condiciones climatológicas, y masa corporal del pichón sobre la supervivencia de Charadrius montanus en la ...

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Section: Juvenile Survivalsupporting

confidence: 62%

Section: Statistical Analyses Population Modelingmentioning

confidence: 99%

Influence of Drought on Annual Survival of the Mountain Plover in Montana

Dinsmore¹

2008

Condor

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“…For example, European Golden-Plover chicks that survived the first week of life gained significantly more weight in the first two days of life than their counterparts that died (PearceHiggins and Yalden 2002). Heavier Western Sandpiper chicks were more likely to survive their 15-day fledging period than chicks of lower mass (Ruthrauff and McCaffery 2005). We lack data to evaluate the contribution of neonate mass to subsequent survival.…”

Section: Age-dependent Survivalmentioning

confidence: 97%

“…In other shorebirds (Graul 1973, Ruthrauff and McCaffery 2005, Morse et al 2006, there is evidence that chick survival during the first few days of life is low (Table 1). To account for this, we examined four models summarizing a range of short-term effects on chick survival.…”

Section: Data Summary and Analysismentioning

confidence: 99%

Age-Related Survival and Behavior of Snowy Plover Chicks

Colwell

Hurley

Hall

et al. 2007

Condor

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Precocial young often experience high mortality prior to achieving flight, especially in the first days after hatching. We quantified relationships between chick age, survival, behavior, and response to natural and anthropogenic danger for the threatened Western Snowy Plover (Charadrius alexandrinus nivosus) in coastal northern California, USA. Plover chicks were most likely to die in the first three days of their 28-day prefledging period, especially on sandy ocean beaches compared to coarser substrates of river habitats. Chick survival in both habitats increased across the ∼120-day chick-rearing period. Improved survival of older chicks coincided with an age-related reduction in brooding and increased distance from the tending parent, which was not related to season. Lower survival of younger chicks was correlated with a tendency to lie motionless when approached by humans; nearly all older chicks responded to human approach by running to evade danger. Chicks of all ages were more likely to lie motionless when potential avian predators flew nearby. Agedependent survival of Snowy Plover chicks paralleled a trend of increasing development, thermal independence from adults, and capability of evading predators. Abstract. Precocial young often experience high mortality prior to achieving flight, especially in the first days after hatching. We quantified relationships between chick age, survival, behavior, and response to natural and anthropogenic danger for the threatened Western Snowy Plover (Charadrius alexandrinus nivosus) in coastal northern California, USA. Plover chicks were most likely to die in the first three days of their 28-day prefledging period, especially on sandy ocean beaches compared to coarser substrates of river habitats. Chick survival in both habitats increased across the ,120-day chick-rearing period. Improved survival of older chicks coincided with an age-related reduction in brooding and increased distance from the tending parent, which was not related to season. Lower survival of younger chicks was correlated with a tendency to lie motionless when approached by humans; nearly all older chicks responded to human approach by running to evade danger. Chicks of all ages were more likely to lie motionless when potential avian predators flew nearby. Age-dependent survival of Snowy Plover chicks paralleled a trend of increasing development, thermal independence from adults, and capability of evading predators.Key words: antipredator behavior, Charadrius alexandrinus, chick survival, habitat quality, human disturbance, predation danger, Snowy Plover. Supervivencia Relativa a la Edad y Comportamiento de los Pichones deCharadrius alexandrinusResumen. Los pichones precociales usualmente experimentan una alta mortalidad antes de adquirir la capacidad del vuelo, especialmente en los primeros días luego de eclosionar. Cuantificamos la relació n entre la edad del pichó n, la supervivencia, el comportamiento y la respuesta a peligros naturales y antropogénicos para la especie amenazada Charadrius ...

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“…In many shorebirds, females cease laying eggs despite plentiful food [19][20][21], apparently because chick growth rate and survivorship from late nests falls as the availability of food for chicks declines seasonally [20,[22][23][24]. We argue that this is true for Pacific dunlins, whose extended Arctic residence allows them to utilize the full period during which local habitat productivity makes breeding worthwhile.…”

Section: Introductionmentioning

confidence: 99%