Temporal variation in annual survival probability of the Eurasian woodcock Scolopax rusticola wintering in France

The spider tortoise (Pyxis arachnoides) is endemic to the coastal, dry forests of southwest Madagascar, one of the country’s most threatened habitats. Very little is known of the biology of this Critically Endangered species. We devised a three year capture-mark-recapture study to assess mean annual survival for the following cohorts; juvenile, adult male, adult female and adult of both sexes, for a population of spider tortoises using a Cormack-Jolly-Seber model. Low recapture probabilities prevented the modelling of all but the adult of both sexes cohort. Mean annual survival was 0.823 (; ). We hypothesise that habitat loss could be impacting the survival of this cohort; however establishing control data to test for this is difficult because of the widespread habitat loss, even within protected areas. Therefore we suggest extending the study across a number of gradients of impacted habitat and increase the duration of the study to assess this risk to the population and improve model robustness.

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The Relationship Between Body Mass and Survival of Wintering Canvasbacks

The Auk ◽

10.1093/auk/103.3.506 ◽

1986 ◽

Vol 103 (3) ◽

pp. 506-514 ◽

Cited By ~ 68

Author(s):

G. M. Haramis ◽

J. D. Nichols ◽

K. H. Pollock ◽

J. E. Hines

Keyword(s):

Body Mass ◽

Survival Probability ◽

Alternative Explanation ◽

Small Sample Size ◽

Small Sample ◽

Cold Weather ◽

Early Winter ◽

Adult Males ◽

Annual Survival ◽

Survival Probabilities

Abstract Mass and recapture histories of 6,000 Canvasbacks (Aythya valisineria) banded in upper Chesapeake Bay were used to test two hypotheses: (1) early-winter body mass is associated with the probability of surviving the winter, and (2) early-winter body mass is associated with annual survival probability. Data were analyzed by a binary regression method that treated mass as a continuous variable and estimated parameters to describe a general relationship between body mass and survival probability. Results for adult males, which provided our largest data sets, presented strong evidence that birds with high relative early-winter masses had both greater overwinter and annual survival probabilities. Results of overwinter analyses necessarily are qualified by the alternative explanation of mass-dependent emigration, i.e. the possibility that lighter birds move south in response to cold weather and leave only heavy birds for recapture. Such a phenomenon remains to be documented. Results concerning annual survival probabilities are not vulnerable to this alternative explanation because of the strong fidelity of Canvasbacks at the banding site. Because of small sample size, data were inadequate to permit mass/survival inferences for adult females. Sample sizes were adequate for young Canvasbacks, but the results were less consistent than for adult males. Although early-winter body mass was associated positively with overwinter as well as annual survival for young Canvasbacks in some years, we suspect that the lack of established wintering patterns among these birds may underlie the less consistent result.

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Intra-annual patterns in adult band-tailed pigeon survival estimates

Wildlife Research ◽

10.1071/wr14199 ◽

2015 ◽

Vol 42 (5) ◽

pp. 454 ◽

Cited By ~ 4

Author(s):

Michael L. Casazza ◽

Peter S. Coates ◽

Cory T. Overton ◽

Kristy B. Howe

Keyword(s):

Survival Probability ◽

Pacific Coast ◽

Survival Rates ◽

Parameter Estimates ◽

Very High Frequency ◽

Apparent Paradox ◽

Annual Survival ◽

Very High ◽

Nesting Season ◽

Return Data

Context The band-tailed pigeon (Patagioenas fasciata) is a migratory species occurring in western North America with low recruitment potential and populations that have declined an average of 2.4% per year since the 1960s. Investigations into band-tailed pigeon demographic rates date back to the early 1900s, and existing annual survival rate estimates were derived in the 1970s using band return data. Aims The primary purpose of the paper was to demonstrate that the apparent paradox between band-tailed pigeon population dynamics (long-term steady decline) and breeding season survival rates (very high) can be explained by changes in survival probability during the remainder of the year. Methods We trapped Pacific coast band-tailed pigeons during two separate periods: we equipped pigeons with very high frequency (VHF) radio-transmitters in 1999–2000 (1999 = 20; 2000 = 34); and outfitted pigeons with solar powered platform transmitting terminal (PTT) transmitters in 2006–08 (n = 20). We used known fate models to estimate annual survival rates and seasonal survival variation among four periods based on an annual behavioural cycle based on phenological events (nesting, autumn migration, winter and spring migrations). We used model averaged parameter estimates to account for model selection uncertainty. Key results Neither body condition nor sex were associated with variation in band-tailed pigeon survival rates. Weekly survival during the nesting season did not differ significantly between VHF-marked (0.996; CI = 0.984–0.999) and PTT-marked pigeons (0.998; CI = 0.990–1.00). Model averaged annual survival of PTT-marked pigeons was 0.682 (95% CI = 0.426–0.861) and was similar to annual survival estimated in previous studies using band return data. Survival probability was lowest during both migration periods and highest during the nesting period. Conclusions Our survival estimates are consistent with those of prior studies and suggest that mortality risk is greatest during migration. Weekly survival probability during winter was nearly the same as during the nesting season; however, winter was the longest period and survival throughout winter was lower than other seasons. Implications We present the first inter-seasonal analysis of survival probability of the Pacific coast race of band-tailed pigeons and illustrate important temporal patterns that may influence future species management including harvest strategies and disease monitoring.

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Annual survival probabilities of anadromous Arctic Char remain high and stable despite inter-annual differences in sea ice melt date

Arctic Science ◽

10.1139/as-2020-0029 ◽

2021 ◽

Author(s):

Isabeau Caza-Allard ◽

Marc J. Mazerolle ◽

Les N Harris ◽

Brendan Malley ◽

Ross F. Tallman ◽

...

Keyword(s):

Sea Ice ◽

Survival Probability ◽

Interannual Variation ◽

Salvelinus Alpinus ◽

Ice Cover ◽

Arctic Char ◽

Annual Survival ◽

Survival Probabilities ◽

Ice Melt ◽

The Impact

Throughout their range, anadromous Arctic Char (Salvelinus alpinus) support commercial, recreational, and subsistence fisheries that are important economically, socially, and culturally yet drivers of interannual variation in survival in this species, however, remain poorly understood. Here, we aimed to quantify the impact of environmental and biological parameters on the survival probability of anadromous Arctic Char near the community of Cambridge Bay, Nunavut. To do so, we tracked 183 Arctic Char tagged with acoustic transmitters and used capture-mark-recapture methods to estimate survival probabilities over six years. Annual survival probabilities for individuals was high, varying between 0.79 and 0.88, whereas recapture probabilities varied between 0.64 and 0.90. Interannual variation in survival probability was low and neither the environmental (air temperature, sea ice cover) nor biological (sex) variables influenced survival probability. These estimates suggest that annual survival probability is high for anadromous adult Arctic Char in the Cambridge Bay area, despite clear differences in the ice cover melt date among years. These results further our understanding of the demographic parameters of Arctic Char in the region, which will be important for future assessments of the sustainability of commercial fisheries as well as for predicting population responses to a rapidly changing Arctic.

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Temporal variation in the annual survival rates of six granivorous birds with contrasting population trends

Ibis ◽

10.1111/j.1474-919x.1999.tb07370.x ◽

2008 ◽

Vol 141 (4) ◽

pp. 621-636 ◽

Cited By ~ 60

Author(s):

Gavin M. Siriwardena ◽

Stephen R. Baillie ◽

Jeremy D. Wilson

Keyword(s):

Temporal Variation ◽

Survival Rates ◽

Population Trends ◽

Annual Survival

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Variation in adult annual survival probability and remigration intervals of sea turtles

Marine Biology ◽

10.1007/s00227-007-0611-6 ◽

2007 ◽

Vol 151 (5) ◽

pp. 1721-1730 ◽

Cited By ~ 40

Author(s):

Sebastian Troëng ◽

Milani Chaloupka

Keyword(s):

Survival Probability ◽

Sea Turtles ◽

Annual Survival

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Demographic Consequences of Precocious Maturation of Atlantic Salmon (Salmo salar)

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f84-165 ◽

1984 ◽

Vol 41 (9) ◽

pp. 1349-1353 ◽

Cited By ~ 95

Author(s):

R. A. Myers

Keyword(s):

Atlantic Salmon ◽

Salmo Salar ◽

Adult Male ◽

Sexual Maturation ◽

Survival Probability ◽

Economic Loss ◽

Annual Survival ◽

Atlantic Salmon Salmo Salar ◽

Second Year ◽

Salmon Production

Detailed records of outgoing smolts of Atlantic salmon (Salmo salar) and estimates of the parr population that produced them were used to study the demographic conequences of male precocious sexual maturation in southwest Newfoundland. Approximately 80% of males matured precociously in the stream. Annual survival probability of a male that reproduces precociously is reduced by a median 44%. Precocious maturation delays smolting; the probability of smolting in the second year for a male precocious parr is approximately 13% of that of a female. The economic loss due to precocious maturation is large; 60% of the adult male salmon production is lost due to precocious maturation.

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Does baseline corticosterone influence inter-annual apparent survival of the Thorn-tailed Rayadito?

10.21203/rs.2.22900/v1 ◽

2020 ◽

Author(s):

Verónica Quirici ◽

Esteban Botero-Delgadillo ◽

Paulina González-Gómez ◽

Pamela Espíndola-Hernández ◽

Brayan Zambrano ◽

...

Keyword(s):

Survival Probability ◽

Survival Models ◽

Mark Recapture ◽

Annual Survival ◽

Probability Of Survival ◽

Long Term Study ◽

Lower Baseline ◽

Capture Recapture ◽

Two Populations

Abstract Background: Many studies have attempted to link variation in corticosterone (Cort), the primary glucocorticoid (GC) in birds, with reproductive output, however the consequences of variation in Cort levels on survival probability have been relatively less explored. When considering baseline Cort and survival probability, two hypotheses have been proposed, the cort-fitness hypothesis and the cort-activity hypothesis. Notwithstanding a few exceptions, studies have generally however shown no relationship between levels of baseline Cort and the probability of survival. Methods: With the aim of increasing our understanding of the effect of baseline Cort on survival probability we utilized mark-recapture data from a long-term study (eight years of capture-mark-recapture) of the Thorn-tailed Rayadito ( Aphrastura spinicauda ), fitting different survival models with and without baseline Cort levels as covariates. Secondly, because the two populations in our study have different values of baseline Cort, we evaluated whether the association between baseline Cort and apparent inter-annual survival probability varied in relation to these two populations. Results: In the high latitude population (the population with lower baseline Cort levels), we observed a quadratic (inverted U-shape) relationship between baseline Cort levels and inter-annual survival probability; in the low latitude population, baseline Cort had no apparent effect on inter-annual survival probability. Conclusions: Because of the quadratic relationship, a relationship that only can be observed with long-term data, our approach emphasizes the importance of using a capture-recapture model. In addition, because the effect of baseline Cort on survival probability was found to be context-dependent, our work also highlights the importance of comparing different populations.

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