2,396 research outputs found
Adaptive latitudinal variation in Common Blackbird Turdus merula nest characteristics
Nest construction is taxonomically widespread, yet our understanding of adaptive
intraspecific variation in nest design remains poor. Nest characteristics are
expected to vary adaptively in response to predictable variation in spring temperatures
over large spatial scales, yet such variation in nest design remains largely
overlooked, particularly amongst open-cup-nesting birds. Here, we systematically
examined the effects of latitudinal variation in spring temperatures and precipitation
on the morphology, volume, composition, and insulatory properties of
open-cup-nesting Common Blackbirds’ Turdus merula nests to test the hypothesis
that birds living in cooler environments at more northerly latitudes would build
better insulated nests than conspecifics living in warmer environments at more
southerly latitudes. As spring temperatures increased with decreasing latitude, the
external diameter of nests decreased. However, as nest wall thickness also
decreased, there was no variation in the diameter of the internal nest cups. Only
the mass of dry grasses within nests decreased with warmer temperatures at lower
latitudes. The insulatory properties of nests declined with warmer temperatures at
lower latitudes and nests containing greater amounts of dry grasses had higher insulatory
properties. The insulatory properties of nests decreased with warmer temperatures
at lower latitudes, via changes in morphology (wall thickness) and
composition (dry grasses). Meanwhile, spring precipitation did not vary with latitude,
and none of the nest characteristics varied with spring precipitation. This suggests
that Common Blackbirds nesting at higher latitudes were building nests with
thicker walls in order to counteract the cooler temperatures. We have provided evidence
that the nest construction behavior of open-cup-nesting birds systematically
varies in response to large-scale spatial variation in spring temperatures
First light for avian embryos: eggshell thickness and pigmentation mediate variation in development and UV exposure in wild bird eggs
Article first published online: 29 JUL 20141. The avian embryo's development is influenced by both the amount and the wavelength of the light that passes through the eggshell. Commercial poultry breeders use light of specific wavelengths to accelerate embryonic growth, yet the effects of the variably patterned eggshells of wild bird species on light transmission and embryonic development remain largely unexplored. 2. Here, we provide the first comparative phylogenetic analysis of light transmission, through a diverse range of bird eggshells (74 British breeding species), in relation to the eggshell's thickness, permeability, pigment concentration and surface reflectance spectrum (colour). 3. The percentage of light transmitted through the eggshell was measured in the spectral range 250–700 nm. Our quantitative analyses confirm anecdotal reports that eggshells filter the light of the externally coloured shell. Specifically, we detected a positive relationship between surface eggshell reflectance (‘brightness’) and the percentage of light transmitted through the eggshell, and this relationship was strongest at wavelengths in the human-visible blue-green region of the spectra (c. 435 nm). 4. We show that less light passes through thicker eggshells with greater total pigment concentrations. By contrast, permeability (measured as water vapour conductance) did not covary significantly with light transmission. Eggs of closed-nesting species let more light pass through, compared with open nesters. 5. We postulate that greater light transmission is required to assist embryonic development under low light exposure. Importantly, this result provides an ecological explanation for the repeated evolution of immaculate, white- or pale-coloured eggshells in species nesting in enclosed spaces. 6. Finally, we detected correlative support for the solar radiation hypothesis, in that eggshells of bird species with a longer incubation period let significantly less of the potentially harmful, ultraviolet (UV) light pass through the eggshell. In summary, we demonstrate suites of avian eggshell properties, including eggshell structure and pigmentation, which are consistent with an evolutionary pressure to both enhance and protect embryonic development.Golo Maurer, Steven J. Portugal, Mark E. Hauber, Ivan Mikšík, Douglas G. D. Russell and Phillip Casse
Associations of the mechanical, anthropometric and gait contributors to the knee adduction moment during paediatric gait
The knee adduction moment (KAM) during gait has been proposed as an
indirect measure of dynamic knee joint loading and has been reported to be higher in obese
children [1, 2]. The KAM is primarily calculated from the resultant ground reaction force
(GRF) and the lever arm length, both of which can be manipulated through weight-loss or
medical interventions [1]. However, there is little data on the relationships between the
mechanical, anthropometric and gait contributors to the KAM during paediatric gait. The
objectives of the study were to examine the associations with the first (1st) and second (2nd)
peak KAM (pKAM) and: (1) centre of pressure (CoP), KAM lever arm length, vertical and
mediolateral ground reaction forces (GRF) and, (2) fat mass, height, step width, foot rotation,
knee rotation and walking velocity
Reliability of three foot models to examine paediatric gait
Background
A variety of multi-segmental foot models have been produced
to examine patterns of foot segmental movement
during gait cycle to identify biomechanical differences
between normal and pathological foot function[1-3].
The reliability of foot models to accurately describe
motion of the foot joints is dependent on the ability of
the examiner to repeatedly apply markers to specific
landmarks and the relevance of models’ segmental
descriptions to underlying anatomy. The aim of this
study was to test the reliability of segmental angles measured
by three published foot models during paediatric
gait.
Materials and methods
Sixteen children, aged 6 to 12 years old, were recruited
to the study. Marker sets for three foot models 3DFoot
[1], Oxford Foot Model (OFM)[2], and Kinfoot[3] were
applied to their right feet simultaneously which to the
authors knowledge, is the first direct comparison of the
three models during gait. Each foot model was assessed
for repeatability of maximal joint angle and range of
motion during the gait cycle between two testing occasions.
Absolute angular differences and standard error
of measurement (SEM) are reported.
Results
Repeatability of all maximal segmental angles and range
of motions were higher in 3DFoot compared to OFM
and Kinfoot (Table 1)
Digging deeper - A new data mining workflow for improved processing and interpretation of high resolution GC-Q-TOF MS data in archaeological research
Evaluation of multi-segmental kinematic modelling in the paediatric foot using three concurrent foot models
Background:
Various foot models are used in the analysis of foot motion during gait and selection of the
appropriate model can be difficult. The clinical utility of a model is dependent on the repeatability of the data as
well as an understanding of the expected error in the process of data collection. Kinematic assessment of the
paediatric foot is challenging and little is reported about multi-segment foot models in this population. The aim of
this study was to examine three foot models and establish their concurrent test-retest repeatability in evaluation of
paediatric foot motion during gait.
Methods:
3
DFoot, Kinfoot and the Oxford Foot Model (OFM) were applied concurrently to the right foot and lower
limb of 14 children on two testing sessions. Angular data for foot segments were extracted at gait cycle events and
peaks and compared between sessions by intraclass correlation coefficient (ICC) with 95% confidence intervals (95%
CI) and standard error of measurement (SEM).
Results:
All foot models demonstrated moderate repeatability: OFM (ICC 0.55, 95% CI 0.16 to 0.77), 3DFoot (ICC
0.47, 95% CI 0.15 to 0.64) and Kinfoot (ICC 0.43, 95% CI
−
0.03 to 0.59). On the basis of a cut-off of 5°, acceptable
mean error over repeated sessions was observed for OFM (SEM 4.61° ± 2.86°) and 3DFoot (SEM 3.88° ± 2.18°) but not
for Kinfoot (SEM 5.08° ± 1.53°). Reliability of segmental kinematics varied, with low repeatability (ICC < 0.4) found for
14.3% of OFM angles, 22.7% of 3DFoot angles and 37.6% of Kinfoot angles. SEM greater than 5° was found in 26.2%
of OFM, 15.2% of 3DFoot, and 43.8% of Kinfoot segmental angles.
Conclusion:
Findings from this work have demonstrated that segmental foot kinematics are repeatable in the
paediatric foot but the level of repeatability and error varies across the segments of the different models.
Information on repeatability and test-retest errors of three-dimensional foot models can better inform clinical
assessment and advance understanding of foot motion during gai
Wild fledgling tits do not mob in response to conspecific or heterospecific mobbing calls
This research was funded by the Natural Environment Research Council (NE/J018694/1), the Royal Society (RG2012R2), the M. J. Murdock Charitable Trust (2014199) and the University of St Andrews (University of St Andrews 600th Year Scholarship and the St Leonard’s Fee Scholarship).Mobbing, where birds harass a predator through a combination of vocalizations and stereotyped behaviours, is an effective anti‐predator behaviour for many species. Mobbing may be particularly important for juveniles, as these individuals are often more vulnerable than adults. Although the component behaviours of mobbing are often considered to be un‐learned, there are few confirmatory data, and the developmental trajectory of mobbing is unknown. In this study, we tested whether conspecific or heterospecific mobbing calls initiated mobbing behaviour in juvenile Blue Tits Cyanistes caeruleus. We located wild adult and recently fledged juvenile Blue Tits and presented them with playback recordings of adult conspecific (Blue Tit) and heterospecific (Great Tit Parus major) mobbing alarm calls. Although adult birds readily mob in response to these types of playbacks, juveniles did not exhibit characteristic mobbing behaviour. Some juveniles did, however, exhibit individual components of mobbing behaviour found in mobbing, despite not producing adult‐like mobbing behaviour in response to either conspecific or heterospecific playback. These results suggest that, although birds might be capable of mobbing as juveniles, the associations between the non‐vocal stereotyped mobbing behaviours and mobbing calls may be learned.PostprintPeer reviewe
The impact of body fat on three dimensional motion of the paediatric foot during walking
Childhood obesity is commonly associated with a pes planus foot type and altered lower limb joint function during walking. However, limited information has been reported on dynamic intersegment foot motion with the level of obesity in children. The aim of this study was to explore the relationships between intersegment foot motion during gait and body fat in boys age 7 to 11 years.
Fat mass was measured in fifty-five boys using air displacement plethysmography. Three-dimensional gait analysis was conducted on the right foot of each participant using the 3DFoot model to capture angular motion of the shank, calcaneus, midfoot and metatarsals. Two multivariate statistical techniques were employed; principle component analysis reduced the multidimensional nature of gait analysis, and multiple linear regression analysis accounted for potential confounding factors.
Higher fat mass predicted greater plantarflexion of the calcaneus during the first half and end of stance phase and at the end of swing phase. Greater abduction of the calcaneus throughout stance and swing was predicted by greater fat mass. At the midfoot, higher fat mass predicted greater dorsiflexion and eversion throughout the gait cycle.
The findings present novel information on the relationships between intersegment angular motion of the foot and body fat in young boys. The data indicates a more pronated foot type in boys with greater body fat. These findings have clinical implications for pes planus and a predisposition for pain and discomfort during weight bearing activities potentially reducing motivation in obese children to be physically active
Prenatal maternal effects appear to be insensitive to experimental or natural environmental variation:Environmental effects on egg traits
In many birds, hatching asynchrony is a common phenomenon, primarily driven by patterns of incubation behaviour. However, experimental results in blue tits (Cyanistes caeruleus) have shown that asynchrony is reduced by intrinsic properties of later eggs that accelerate prenatal development. These intrinsic differences between early and late eggs could be driven by changes in resource availability to females, which are then passively passed onto the egg. Alternatively, it may be due to an anticipatory maternal effect, wherein some signal or resource is actively placed within the egg, which is beneficial to those eggs laid late within the clutch. In order to distinguish between these hypotheses we designed a supplementary feeding experiment, wherein females were provided with food at certain times during the laying phase. This had no discernible effect on development rate, or other egg characteristics, consistent with anticipatory maternal effects. Using a larger dataset we also tested whether natural environmental variation (weather) during egg formation affected maternal investment in eggs. Similarly, egg characteristics were found to be relatively insensitive to the environmental variation, supporting the experimental results.</p
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