scholarly journals Effects of research disturbance on nest survival in a mixed colony of waterbirds

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7844
Author(s):  
Jocelyn Champagnon ◽  
Hugo Carré ◽  
Lisa Gili
Keyword(s):  
Survival Rate ◽  
Reproductive Success ◽  
Bird Species ◽  
Daily Survival Rate ◽  
Negative Effects ◽  
Control Zone ◽  
Daily Survival ◽  
Disturbed Zone ◽  
Breeding Seasons

Background Long-term research is crucial for the conservation and development of knowledge in ecology; however, it is essential to quantify and minimize any negative effects associated with research to gather reliable and representative long-term monitoring data. In colonial bird species, chicks are often marked with coded bands in order to assess demographic parameters of the population. Banding chicks in multi-species colonies is challenging because it involves disturbances to species that are at different stages of progress in their reproduction. Methods We took advantage of a long term banding program launched on Glossy Ibis (Plegadis falcinellus) breeding in a major mixed colony of herons in Camargue, southern France, to assess the effect of banding operation disturbance on the reproductive success of the three most numerous waterbirds species in the colony. Over two breeding seasons (2015 and 2016), 336 nests of Glossy Ibis, Little Egrets (Egretta garzetta) and Cattle Egrets (Bubulcus ibis) were monitored from a floating blind in two zones of the colony: one zone disturbed twice a year by the banding activities and another not disturbed (control zone). We applied a logistic-exposure analysis method to estimate the daily survival rate (DSR) of nests and chicks aged up to three weeks. Results Daily survival rate of Glossy Ibis was reduced in the disturbed zone while DSR increased for Little and Cattle Egrets in the disturbed zone. Nevertheless, DSR was not reduced on the week following the banding, thus discarding a direct effect of handling on breeding success of Glossy Ibis. The protocol and statistical analysis presented here are robust and can be applied to any bird species to test for the effect of a research disturbance or other short and repeated temporal events that may affect reproductive success over one or more breeding seasons.

Daily survival rate for nests of Black Skimmers from a core breeding area of the southeastern USA

2014 ◽  
Vol 126 (3) ◽  
pp. 443-450 ◽  
Author(s):  
Gillian L. Brooks ◽  
Felicia J. Sanders ◽  
Patrick D. Gerard ◽  
Patrick G. R. Jodice
Keyword(s):  
Survival Rate ◽  
Daily Survival Rate ◽  
Breeding Area ◽  
Southeastern Usa ◽  
Daily Survival

Nest daily survival rate of six Costa Rican urban birds

2021 ◽  
Vol 132 (4) ◽  
Author(s):  
José D. Ramírez-Fernández ◽  
Gilbert Barrantes
Keyword(s):  
Survival Rate ◽  
Costa Rican ◽  
Daily Survival Rate ◽  
Urban Birds ◽  
Daily Survival

scholarly journals Endoparasite Infection Has Both Short- and Long-Term Negative Effects on Reproductive Success of Female House Sparrows, as Revealed by Faecal Parasitic Egg Counts

PLoS ONE ◽  
2015 ◽  
Vol 10 (5) ◽  
pp. e0125773 ◽  
Author(s):  
Håkon Holand ◽  
Henrik Jensen ◽  
Jarle Tufto ◽  
Henrik Pärn ◽  
Bernt-Erik Sæther ◽  
...  
Keyword(s):  
Reproductive Success ◽  
Negative Effects ◽  
House Sparrows ◽  
Short And Long Term

scholarly journals Does human hair attract or deter potential ground nest predators?

2020 ◽  
Vol 28 (2) ◽  
pp. 135-145
Author(s):  
Jenő J. Purger ◽  
Zsófia Szegleti ◽  
Dávid Szép
Keyword(s):  
Survival Rate ◽  
Breeding Success ◽  
Human Hair ◽  
Nest Building ◽  
Daily Survival Rate ◽  
Artificial Nests ◽  
Daily Survival ◽  
Reptile Species ◽  
Pass Through

AbstractThe nests of rare and threatened bird and reptile species that breed on the ground are often attempted to be protected from predators with fences, grids, and various repellent materials. Results of some experiments refer to the repellent function of human scent, whereas others suggest that it has an attractive role. We aimed to investigate how effectively ground nests can be protected from predators if human hair is placed around nests. We performed the experiment in a riverine oak-elm-ash forest using 90 artificial nests, each with 1 quail and 1 plasticine egg: 30 nests were protected with a game fence, 30 nests were surrounded with human hair and 30 nests were unprotected (control). During the 24 days, predators damaged 23% of the nests protected by a game fence, 40% of unprotected nests and 47% of the nests surrounded with hair. The daily survival rate of quail eggs in nests protected with a game fence was significantly higher than the ones in the nests surrounded with human hair. Only 18% of the quail eggs and 36% of plasticine eggs were damaged. Such difference can be explained by the fact that small-bodied birds and mammals could pass through the game fence and left traces on plasticine eggs but they were unable to crack the shell of quail eggs. Within the game fence, denser vegetation can provide better nesting conditions and result in greater breeding success. The repellent role of human hair has not been proved, on the contrary, in some cases we have observed signs of its attractant role, such as small-bodied birds took hair away for nest building.

scholarly journals The effect of climate change on the duration of avian breeding seasons: a meta-analysis

2017 ◽  
Vol 284 (1867) ◽  
pp. 20171710 ◽  
Author(s):  
Lucyna Halupka ◽  
Konrad Halupka
Keyword(s):  
Migratory Birds ◽  
Meta Analysis ◽  
Bird Species ◽  
Egg Laying ◽  
Long Distance ◽  
Local Climate ◽  
Ecological Flexibility ◽  
Breeding Grounds ◽  
Breeding Seasons

Many bird species are advancing the timing of their egg-laying in response to a warming climate. Little is known, however, of whether this advancement affects the respective length of the breeding seasons. A meta-analysis of 65 long-term studies of 54 species from the Northern Hemisphere has revealed that within the last 45 years an average population has lengthened the season by 1.4 days per decade, which was independent from changes in mean laying dates. Multi-brooded birds have prolonged their seasons by 4 days per decade, while single-brooded have shortened by 2 days. Changes in season lengths covaried with local climate changes: warming was correlated with prolonged seasons in multi-brooded species, but not in single-brooders. This might be a result of higher ecological flexibility of multi-brooded birds, whereas single brooders may have problems with synchronizing their reproduction with the peak of food resources. Sedentary species and short-distance migrants prolonged their breeding seasons more than long-distance migrants, which probably cannot track conditions at their breeding grounds. We conclude that as long as climate warming continues without major changes in ecological conditions, multi-brooded or sedentary species will probably increase their reproductive output, while the opposite effect may occur in single-brooded or migratory birds.

scholarly journals Helpers increase daily survival rate of Southern Lapwing (Vanellus chilensis) nests during the incubation stage

2017 ◽  
Author(s):  
Eduardo S. A. Santos ◽  
Regina H. Macedo
Keyword(s):  
Survival Rate ◽  
Cooperative Breeding ◽  
Null Model ◽  
Daily Survival Rate ◽  
Egg Survival ◽  
Incubation Stage ◽  
Daily Survival ◽  
Group Members ◽  
Breeding Groups ◽  
Model Weight

AbstractCooperative breeding is characterized by reproduction in the presence of helpers. What impact these helpers have on the reproductive success of group members is one of the long-standing questions in the cooperative breeding literature. In cooperative species, helpers are known to provide benefits during multiple stages or at a particular stage of the reproductive cycle. The aim of this study was to investigate whether helpers increased the daily survival rate of nests during the incubation stage in the Southern Lapwing (Vanellus chilensis), a crested plover with a cooperative breeding system. Southern Lapwings have a variable mating system, with some breeding groups composed of unassisted pairs, and others that breed in the presence of helpers. Our best supported model indicated a positive effect of the presence of helpers on the daily survival rate of nests, leading to a probability of nest success (i.e., survival until hatching) of 83%, compared to 51% for nests of unassisted pairs. But a null model had a similar model weight as the best supported model and was the second-best model. Our study provides evidence that helpers influence egg survival during the egg-incubation stage, which could influence the fitness of breeders.

LOCAL DISPERSAL OF MALE SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE) MOTHS DETERMINED BY MARK, RELEASE, AND RECAPTURE

1983 ◽  
Vol 115 (9) ◽  
pp. 1065-1070 ◽  
Author(s):  
C. J. Sanders
Keyword(s):  
Survival Rate ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Field Conditions ◽  
Daily Survival Rate ◽  
Release Point ◽  
Daily Survival ◽  
Baited Traps ◽  
Local Dispersal

AbstractLocal dispersal and survival of male spruce budworm, Choristoneura fumiferana (Clem.), moths under field conditions was determined by mark, release, and recapture in pheromone-baited traps. Recapture rates and distance of recapture were dependent upon height of traps and proximity of traps to the release point, but over 65% of those recaptured were caught within 50 m. With traps 20 m apart, 30% of the recaptures were in traps farthest from the release point (50–70 m), a fact which suggests that male spruce budworm may disperse beyond this distance at low densities. Males were recaptured up to 7 days after release, and had a daily survival rate averaging 67%.

scholarly journals Correcting Nesting-Success Estimates for Observer Effects: Maximum-Likelihood Estimates of Daily Survival Rates With Reduced Bias

The Auk ◽  
2000 ◽  
Vol 117 (1) ◽  
pp. 92-109 ◽  
Author(s):  
Jay J. Rotellam ◽  
Mark L. Taper ◽  
Andrew J. Hansen
Keyword(s):  
Survival Rate ◽  
Survival Rates ◽  
Complex Model ◽  
Nesting Success ◽  
Daily Survival Rate ◽  
Sample Sizes ◽  
Observer Effect ◽  
Daily Survival ◽  
Observer Effects ◽  
Competing Models

AbstractWe develop a statistical method that simultaneously estimates daily survival rate and observer effect. We used Monte Carlo simulation to (1) evaluate the performance of the model, (2) compare model performance with models that ignore observer effects, and (3) evaluate methods of choosing between competing models of survival. When observer effects were absent, all models produced unbiased estimates of daily survival rate. In the presence of observer effects, however, models that ignore these effects underestimated daily survival rate. In such cases, estimates of nesting success were strongly affected even when observer effects were relatively small. In contrast, estimates of daily survival rate and nesting success produced by the model that considers observer effects consistently had little bias. However, estimates of daily survival rate from this model were less precise than those from the simpler model. Objective criteria for choosing between competing models did not perform well with sample sizes of 150 to 600 because subtle but important observer effects are difficult to detect. Likelihood-ratio tests had low power for rejecting the null hypothesis of no observer effect over a wide range of levels of observer effect and with sample sizes of 150 to 600. Estimates of daily survival rate from models selected based on Akaike's Information Criterion (AIC) had higher bias than estimates from the model that estimates observer effect when observer effect was present. Estimates from AIC-selected models had lower mean squared error than estimates from the model that estimates observer effect when observer effects were small, but the pattern reversed as effects increased. We recommend that researchers estimate observer effects using the more complex model when observer effects are possible and decide whether to use estimates of daily survival from the simpler or more complex model based on analysis results and simulation or analytic results for relevant sample sizes, daily survival rates, and observer effects. To illustrate use of the analytical techniques, we analyzed field data from Dusky Flycatcher (Empidonax oberholseri) nests monitored during the nestling stage. The observer effect was estimated to be 1.003 (95% CI 0.866 to 1.162); thus, point estimates of daily survival were very similar from the simpler (0.971; 95% CI 0.957 to 0.985) and more complex model (0.970; 95% CI 0.925 to 1.000). In this case, analysis results and simulation results indicate that the simpler model is adequate and provides an estimate of daily survival rate with small potential bias and increased precision compared with an estimate from the more complex model.

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