Search results for "Lanf"

Growth patterns and life-history strategies in Placodontia (Diapsida: Sauropterygia)

2015

Placodontia is a clade of durophagous, near shore marine reptiles from Triassic sediments of modern-day Europe, Middle East and China. Although much is known about their primary anatomy and palaeoecology, relatively little has been published regarding their life history, i.e. ageing, maturation and growth. Here, growth records derived from long bone histological data of placodont individuals are described and modelled to assess placodont growth and life-history strategies. Growth modelling methods are used to confirm traits documented in the growth record (age at onset of sexual maturity, age when asymptotic length was achieved, age at death, maximum longevity) and also to estimate undocum…

A Numerical Approach to the Keel Design of a Sailing Yacht

2008

This paper describes an approach to the keel design of a sailing yacht. The related software, which is fully automatic, permits to obtain an optimal shape by modifying the surface used to define the keel planform. B-spline curves and surfaces have been used because of their ability in following complex shapes. The algorithm integrates ad hoc implemented original software with Computational Fluid Dynamics (CFD) commercial ones. The optimisation procedure makes use of Genetic Algorithms (GAs) and a gradient – based optimiser for the refinement of the solution. A careful CAD and CFD modelling leads to a stable and efficient generalised method, which has been applied to the design of the centre…

Heikko ravintotilanne rajoittaa hauen (Esox lucius) ja kuhan (Sander lucioperca) kasvua Suotajärvessä

2014

Hauki ja kuha esiintyvät Suomessa usein samoissa vesistöissä, mutta niiden vuorovaikutuksesta tiedetään vain vähän. Mikäli lajit kilpailevat samoista resursseista, runsaat kuhaistutukset tai kuhan luonnollinen yleistyminen voivat vaikuttaa negatiivisesti hauen menestykseen. Tämän tutkimuksen tarkoitus oli selvittää hauen ja kuhan kasvua ja ravinnonkäyttöä Suotajärvessä. Kasvua tarkasteltiin myös suhteessa kasvukausien lämpötilaan. Ravinnonkäytössä keskityttiin hauen ja kuhan ravinnon päällekkäisyyteen ja siitä mahdollisesti seuraavaan ravintokilpailuun. Lisäksi verkkokoekalastuksilla selvitettiin järven kalaston yleistä tilaa, erityisesti ajatellen petokalojen ravintotilannetta. Hauki- ja k…

Theoretical Biology and Evolutionary Theory

2015

During the nineteen-sixties and seventies, several biologists made decisive contributions to the development of evolutionary thought and theoretical biology, smoothly bridging the gap between science and humanities, and overcoming the classic antagonism Snow claimed to exist between the two worlds. Scientists like Jacob , Lorenz , Monod , Rensch , von Bertalanffy or Waddington , to whom I pay homage here, are a select group of scientists pertaining to the so-called third culture, who have staged a scientific assault on Natural Philosophy—the forerunners of subsequent science popularisers such as Dawkins , Gould , Penrose , Gell-Mann or Pinker . Finally I call for a more detailed study of th…

Deducing large scale-listric normel faults geometries from analysis of minor structures

2010

Study of Pinna nobilis growth from inner record: How biased are posterior adductor muscle scars estimates?

2011

abstract Article history:Received 14 June 2011Received in revised form 19 July 2011Accepted 20 July 2011Available online 17 August 2011Keywords:BivalviaEndangered speciesMediterraneanSclerochronologySpain Previous studies have shown that the external growth records of the posterior adductor muscle scar (PAMS)ofthe bivalve Pinna nobilisareincomplete and donot produce accurate ageestimations. We havedeveloped anew methodology to study age and growth using the inner record of the PAMS, which avoids the necessity ofcostly in situ shell measurements or isotopic studies. Using the inner record we identified the positions ofPAMS previously obscured by nacre and estimated the number of missing recor…

“The Best Laid Plans” : Do Individual Differences in Planfulness Moderate Effects of Implementation Intention Interventions?

2022

While there is good evidence supporting the positive effect of planning strategies like implementation intentions on the relationship between intention and behavior, there is less evidence on the moderating role of individual differences in planning capacity on this effect. This study aimed to examine the role of individual differences in planfulness on the effect of planning strategies on the intention–behavior gap. Specifically, this study investigated the influence of planfulness on the effectiveness of implementation intentions on goal-directed behavior using an experimental design. Undergraduate university students (N = 142) with high and low levels of planfulness based on a priori sco…

Empirical links between natural mortality and recovery in marine fishes

2017

Probability of species recovery is thought to be correlated with specific aspects of organismal life history, such as age at maturity and longevity, and how these affect rates of natural mortality ( M ) and maximum per capita population growth ( r max ). Despite strong theoretical underpinnings, these correlates have been based on predicted rather than realized population trajectories following threat mitigation. Here, we examine the level of empirical support for postulated links between a suite of life-history traits (related to maturity, age, size and growth) and recovery in marine fishes. Following threat mitigation (medium time since cessation of overfishing = 20 years), 71% of 55 tem…

La adaptación al uso turístico de los recursos culturales. Una propuesta de evaluación para una comprensión más equilbrada de la actividad turística

2017

Mucho se ha hablado en los últimos años de la importancia de ofrecer experiencias a los que visitan otros lugares distintos de donde viven. Y esas experiencias deben, además, anclarse en el desarrollo de actividades. De ello puede deducirse que las actividades representan el pilar del ocio y, por consiguiente, del turismo, a tenor de la definición oficial de la Organización Mundial del Turismo (1994) y de la conceptualización que del turismo hacen Boniface & Cooper (2009). Ahora bien, estas actividades (hacer senderismo, nadar en la playa, visitar un museo, probar una variedad de vinos, ir al teatro, ver una fiesta popular,…) están inexorablemente asociadas a uno o varios recursos (la monta…