Effects of Weather and Population Density on Reproductive Success and Population Dynamics in a Song Sparrow (Melospiza Melodia) Population: A Long-Term Study

Chase, Mary K.; Nur, Nadav; Geupel, Geoffrey R.

doi:10.1642/0004-8038(2005)122[0571:eowapd]2.0.co;2

Cited by 51 publications

(68 citation statements)

References 59 publications

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“…Mist net data include birds captured many times (likely to be resident near the mist net station) and transient individuals because most passerines that hit the nets are captured regardless of territorial or social status (Sillett & Holmes 2002). The PRBO data set includes large numbers of birds captured only once in the study period, many of which are likely to be transient individuals (Nur, Geupel, & Ballard 2004;Chase, Nur, & Geupel 2005). Outside the migration season, transients are generally considered to be poor-quality younger birds that are less likely to possess territories (Newton 1998) and are likely to have lower capture numbers because they are less site faithful.…”

Section: Discussionmentioning

confidence: 99%

“…While inclement weather is known to increase the probability of incident (North American Banding Council 2001), temperatures at the Marin County stations at PRBO on the central coast of California are relatively mild year-round, and weather conditions can be as variable within a season as between seasons (Chase, Nur, & Geupel 2005). Thus, any variation in risk of injury related to daily extremes in temperature were likely obscured by considering only the month of capture.…”

Section: Discussionmentioning

confidence: 99%

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How safe is mist netting? evaluating the risk of injury and mortality to birds

et al. 2011

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Summary1. The capture of birds using mist nets is a widely utilized technique for monitoring avian populations. While the method is assumed to be safe, very few studies have addressed how frequently injuries and mortalities occur and the associated risks have not been formally evaluated. 2. We quantified the rates of mortality and injury at 22 banding organizations in the United States and Canada and used capture data from five organizations to determine what kinds of incidents occur most frequently. Analyses focused on passerines and near-passerines, but other groups were included. We evaluated whether body mass, age, sex, mist net mesh size, month and time of day or frequency of capture are related to the risk or type of incident. We also compared the recapture histories over time between birds that were injured and those that were never injured for 16 species. 3. The average rate of injury was 0AE59%, while mortality was 0AE23%. Birds captured frequently were less at risk to incident. Body mass was positively correlated with incident and larger birds were at greater risk to predation, leg injuries, broken legs, internal bleeding and cuts, while smaller birds were more prone to stress, tangling-related injuries and wing strain. Rates of incident varied among species, with some at greater risk than others. We found no evidence for increased mortality over time of injured birds compared with uninjured birds. 4. We provide the first comprehensive evaluation of the risks associated with mist netting. Our results indicate that (1) injury and mortality rates below one percent can be achieved during mist netting and (2) injured birds are likely to survive in comparable numbers to uninjured birds after release. While overall risks are low, this study identified vulnerable species and traits that may increase a bird's susceptibility to incident that should be considered in banding protocols aimed at minimizing injury and mortality. Projects using mist nets should monitor their performance and compare their results to those of other organizations.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

How safe is mist netting? evaluating the risk of injury and mortality to birds

et al. 2011

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“…In temperate environments, studies at low elevations generally show a positive effect of temperature and average The Auk: Ornithological Advances 134:696-709, Q 2017 American Ornithological Society precipitation on avian breeding success, but often a negative effect of above-average rainfall (Morrison and Bolger 2002, Chase et al 2005, Collister and Wilson 2007) and sometimes of below-average temperatures (Table 5). Thus, extreme precipitation events frequently lower nesting success in both high-elevation (e.g., Hendricks andNorment 1991, Decker andConway 2009, present study) and low-elevation environments (Fisher et al 2015, Conrey et al 2016.…”

Section: Discussionmentioning

confidence: 99%

An alpine-breeding songbird can adjust dawn incubation rhythms to annual thermal regimes

MacDonald¹,

Camfield²,

Jankowski³

et al. 2014

The Auk

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“…Rainfall patterns are typical of a Mediterranean climate, with the vast majority of the rain accumulating from October to April ( Fig. 3; Chase et al 2005).…”

Section: Data Collectionmentioning

confidence: 99%

“…Annual rainfall was totaled from 1 July to 30 June; this 'bioyear' rainfall is equivalent to the 'water year' used by hydrologists summarizing precipitation in California (Chase et al 2005). Summarizing rainfall in this way provides a description of the annual rainfall in the wet season immediately preceding the breeding season.…”

Section: Data Collectionmentioning

confidence: 99%

Habitat suitability through time: using time series and habitat models to understand changes in bird density

et al. 2014

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Abstract. Confronted with a rapidly changing world and limited resources for conservation, ecologists are increasingly challenged with predicting the impact of climate and land-use change on wildlife. A common approach is to use habitat-suitability models (HSMs) to explain aspects of species' occurrence, such as presence, abundance, and distribution, utilizing physical habitat characteristics. Although HSMs are useful, they are limited because they are typically created using spatial rather than temporal data, which omits temporal dynamics. We explored the value of combining spatial and temporal approaches by comparing HSMs with autoregressive population models. We investigated a 28-year period of bird community dynamics at a field site in northern California during which time the plant community has been transitioning from scrub to conifer forest. We used the two model frameworks to quantify the contribution of vegetation change, weather, and population processes (autoregressive models only) to variation in density of seven bird species over the first 23 years. Model predictive ability was then tested using the subsequent five years of population density data. HSMs explained 58% to 90% of the deviance in species' density. However, models that included density dependence in addition to vegetation covariates provided a better fit to the data for three of the seven species, Song Sparrow (Melospiza melodia), White-crowned Sparrow (Zonotrichia leucophrys), and Wrentit (Chamaea fasciata). These three species have more localized dispersal compared to the other four species, suggesting that dispersal tendency may be an important life-history trait to consider when predicting the impact of climate and land-use change on population levels. Our results suggest that HSMs can effectively explain and predict variation in species' densities through time, however for species with localized dispersal, it may be especially informative to include population processes.

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Effects of Weather and Population Density on Reproductive Success and Population Dynamics in a Song Sparrow (Melospiza Melodia) Population: A Long-Term Study

Cited by 51 publications

References 59 publications

How safe is mist netting? evaluating the risk of injury and mortality to birds

How safe is mist netting? evaluating the risk of injury and mortality to birds

An alpine-breeding songbird can adjust dawn incubation rhythms to annual thermal regimes

Habitat suitability through time: using time series and habitat models to understand changes in bird density

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