Search results for "developmental stage"
showing 10 items of 33 documents
Benefits for nurse and facilitated plants emerge when interactions are considered along the entire life-span
2019
The structure of plant communities is often influenced by facilitative interactions where ‘facilitated’ plants benefit from growing associated with ‘nurse’ plants. Facilitation has been mostly studied from the facilitated plant's perspective, and bidirectional effects between nurse and facilitated plants have received less attention. We hypothesized that reciprocal benefits in plant-plant interactions may emerge when interactions are considered along the life-span of the plants involved. Over one spring, we selected five species with similar life-form and growth strategy, and using a full factorial design, we compared different fitness components along the plants’ life-span (seedling establ…
Estimating cod egg developmental stage based on DNA concentration
2017
Abstract Pelagic egg surveys are commonly used to map Atlantic cod spawning areas in the northeastern Atlantic. However, a sampling location may not necessarily indicate a spawning location, because more developed eggs may have drifted long distances in coastal currents. Newly spawned eggs have only a few embryonic cells, whereas eggs in later developmental stages have progressively larger numbers of cells and hence greater amounts of DNA. The progression through developmental stages largely depends on temperature, which influences cell division and growth. Preservation of the eggs for later analysis presents logistical dilemmas. Preservation in ethanol is suitable for DNA extraction but ob…
Modeling dense inflorescences
2016
Showy inflorescences - clusters of flowers - are a common feature of many plants, greatly contributing to their beauty. The large numbers of individual flowers (florets), arranged in space in a systematic manner, make inflorescences a natural target for procedural modeling. We present a suite of biologically motivated algorithms for modeling and animating the development of inflorescences with closely packed florets. These inflorescences share the following characteristics: (i) in their ensemble, the florets form a relatively smooth, often approximately planar surface; (ii) there are numerous collisions between petals of the same or adjacent florets; and (iii) the developmental stage and ty…
Pigmentation polymorphism in the invasive amphipod Dikerogammarus villosus : some insights into its maintenance
2004
Dikerogammarus villosus, a freshwater invasive amphipod, exhibits conspicuous pigmentation polymorphism. This polymorphism is documented in two recently colonized areas, the Saand Moselle rivers (north-eastern France), and some of the mechanisms by which pigmentation polymorphism can arise and be maintained are addressed. Body size, reproductive status, fecundity and mate choice are compared among morphs of D. villosus in field samples collected in summer 2001. Body size and female gonad developmental stage were comparable among the different morphs, suggesting that polymorphism is not the result of changes in pigmentation with age or moult- cycle. Fecundity and reproductive status (paired …
Comparative analyses of caste, sex, and developmental stage‐specific transcriptomes in two Temnothorax ants
2020
Abstract Social insects dominate arthropod communities worldwide due to cooperation and division of labor in their societies. This, however, makes them vulnerable to exploitation by social parasites, such as slave‐making ants. Slave‐making ant workers pillage brood from neighboring nests of related host ant species. After emergence, host workers take over all nonreproductive colony tasks, whereas slavemakers have lost the ability to care for themselves and their offspring. Here, we compared transcriptomes of different developmental stages (larvae, pupae, and adults), castes (queens and workers), and sexes of two related ant species, the slavemaker Temnothorax americanus and its host Temnoth…
Statistical modelling and RCS detrending methods provide similar estimates of long-term trend in radial growth of common beech in north-eastern France
2011
International audience; Dendrochronological methods have greatly contributed to the documentation of past long-term trends in forest growth. These methods primarily focus on the high-frequency signals of tree ring chronologies. They require the removal of the ageing trend in tree growth, known as 'standardisation' or 'detrending', as a prerequisite to the estimation of such trends. Because the approach is sequential, it may however absorb part of the low-frequency historical signal. In this study, we investigate the effect of a sequential and a simultaneous estimation of the ageing trend on the chronology of growth. We formerly developed a method to estimate historical changes in growth, in…
1-Aminocyclopropane-1-Carboxylic Acid, its Malonyl Conjugate and 1-Aminocyclopropane-1-Carboxylate Synthase Activity in Needles of Damaged and Undama…
1994
Summary Levels of free 1-aminocyclopropane-1-carboxylic acid (ACC), its malonyl conjugate (MACC) and ACC-synthase activity were significantly higher in the needles of damaged Norway spruce trees ( Picea abies (L.) Karst ) compared with those in undamaged trees during both the diurnal and seasonal courses. The concentrations of ACC and MACC, and ACC-synthase activity fluctuated much more intensively in the needles of damaged trees both in the diurnal and the seasonal courses than in those of undamaged ones, which implies that damaged trees respond more sensitively to the environmental conditions. ACC concentrations were the highest in summer and lowest in fall, while MACC concentrations seem…
Irregular assimilation progress: Reasons for setbacks in the context of linguistic therapy of evaluation
2012
The assimilation model suggests progress in psychotherapy follows an eight-stage sequence described by the Assimilation of Problematic Experiences Scale (APES). This study sought to reconcile this developmental stage model with the common but superficially contradictory clinical observation that therapeutic advances alternate with setbacks. Setbacks (n=466) were identified in therapy transcripts of two clients and classified using a preliminary nine-category list of possible alternative reasons for setbacks. Most of the setbacks involved switches among the multiple strands of a problem due to (a) therapists exceeding clients' therapeutic zone of proximal development, (b) therapists guiding …
High versus low motivating music on intermittent fitness and agility in young well-trained basketball players
2021
The present study aimed to analyse the influence of the music level of motivation, compared to the absence of music, on intermittent fitness and agility, in a group of young well-trained basketball players. On alternate days, thirteen players (14.85 ± 0.68 years, 188 ± 0.05 cm, 75.89 ± 8.02 kg) were assessed of the V-Cut test (agility test including changes of direction) and the 30–15 Intermittent Fitness Test (30-15IFT; maximal running speed under fatigue). There were six testing sessions over three consecutive weeks, with three different randomized conditions: team-selected High Motivating Music (HMM), Low Motivating Music (LMM), and the No-Music condition (NM). Arterial oxygen saturation…
Effects of irrigation on fruit ripening behavior and metabolic changes in olive
2012
Olive (Olea europaea, cv Leccino) fruits grown under different water regimes were analyzed by metabolomics and specific transcript accumulation analyses. The fruit from non-irrigated (rain-fed) and irrigated trees cultivated under field conditions, with a seasonal water amount equivalent to the calculated crop evapotranspiration (ETc) was compared in the last developmental phase and, in particular, at commercial harvest. Metabolomics (GC-MS) analysis identified several hundred metabolites in ripe mesocarp, 46 of which showed significantly different contents in the rain-fed and irrigated samples. Some compounds involved in primary metabolism (carbohydrates, amino acids, organic acids) and se…