Comparing composition of social groups, mating system and social behaviour in two populations of Microcavia australis

2009 ◽  
Vol 74 (1) ◽  
pp. 15-24 ◽  
Author(s):  
Paula Taraborelli ◽  
Pablo Moreno
Author(s):  
Danillo Barroso ◽  
Douglas Fernandes Rodrigues Alves ◽  
Gustavo L. Hirose

The aim of the present study is to test the resource economic monopolization hypothesis and the hypothesis of monogamy using the shrimpAlpheus estuariensisas a model. The shrimps were collected in two areas in the Vaza-Barriz estuary, north-east Brazil, from August to November 2016. The average abundance of refuges was obtained through 30 random replicates. The shrimp presented a random distribution in both areas. Males and females found together showed a weak relation between their sizes, with males being larger than females. In addition, the cheliped of males grows proportionally more than that of females. The great abundance of refuges present in the environment, added to the aforementioned results, do not support the idea of refuge-guarding behaviour or monogamy. These results, which are in disagreement with those already found for some shrimps of the same family, genus, and even species, reinforce the idea that Alpheidae can be used as a model in the study of how environmental conditions are capable of shaping the social behaviour of a species.


2010 ◽  
Vol 34 (3) ◽  
pp. 128-137
Author(s):  
Vytautas Petrušonis

In contemporary society marginalization, alienation of social groups is increasing. Among other things, it is related to changes in the phenomenon of social solidarity, which are influenced by the processes of individualization, diversification, globalization, segmentation. Architectural works of modern architects, that together with customers represent the attitudes of nowadays, often reflect the desire to dominate. While educating young architects it is important to provide them not only with technical and artistic skills, but also to make them understand how architecture can take part in the the actualization of harmonic social behaviour stereotypes, the psychological attitude to encourage the pursuit of social solidarity. It is therefore important to learn how architectural composition can ensure a harmonious social interaction. The related adequate experience is worth studying. It is particularly important to evaluate the works of different periods of our country’s famous architects. V. Landsbergis-Žemkalnis could be distinguished as one of such architects to whom responsibility to society was particularly significant. Analysis revealed that V. Landsbergis-Žemkalnis‘ works are characterized by predominance of an organic compositional type what means that the programming of social solidarity attitudes by architectural compositional measures is ensured. In particular, these properties are characteristic of V. Landsbergis-Žemkalnis‘ buildings realized in the heart of Kaunas city. These buildings are better harmonizing with adjacent buildings and the whole street space. Moving away from the center, in the buildings erected by V. Landsbergis-Žemkalnis design, the number of vertical elements increases, separate parts of a building have a more distinct height, the silhouette becomes more active, more dynamic. Typologically such a building could be assigned to the hierachical compositional type. In contrast to ’’buildings of the street”, ”of the city”, these buildings represent ’suburban” buildings, what claims to be a local compositional center. Altogether V. Landsbergis-Žemkalnis‘ works illiustrate his ability to ”read” the situation in an urban context and use properly selected compositional building parameters, especially properly chosen measures operating in a dense group of existing buildings where the solidarity phenomenon is of great importance. Santrauka Šiuolaikinėje visuomenėje didėja atskirtis, socialinių grupių nesusikalbėjimas, užsisklendimas, kuriant grupinius idealus, siekiant nereikšmingų tikslų. Greta kitų dalykų, tai susiję su socialinio solidarumo kaita, kuri veikiama tokių šiuolaikinės civilizacijos reiškinių kaip individualizacija, diversifikacija, globalizacijos procesas, segmentacija. Šiuolaikinės kartos architektų, kartu su užsakovais esančių savojo laikotarpio atstovais, darbai ypač dažnai atspindi siekį dominuoti, išsiskirti bet kokioje miesto dalyje, bet kokioje pastatų apsuptyje, todėl ugdant šiuolaikinius architektus svarbu perteikti jiems ne tik meninio komponavimo įgūdžius, bet suvokimą, kaip architektūra gali prisidėti prie harmoningos socialinės elgsenos stereotipų aktualizavimo, ypač skatinant socialinį solidarumą (nes tai susiję su visuomenės grupių santykių harmonizavimo užtikrinimu). Todėl svarbus kompozicinių priemonių, galinčių užtikrinti harmoningos socialinės sąveikos nuostatų aktualizavimą, socialinio solidarumo nuostatų įtvirtinimą, pažinimas, o tam ypač svarbu šiuo aspektu įvertinti mūsų šalies įvairių laikotarpių įžymių architektų kūrybą. Vienu iš tokių architektų yra V. Landsbergis-Žemkalnis, kuriam architekto atsakomybė visuomenei buvo ypač svarbi. Architekto V. Landsbergio-Žemkalnio darbų analizė parodė, kad jo kūrybai būdingas organiškojo kompozicinio tipo vyravimas, o kartu – socialinio solidarumo programavimą užtikrinančių architektūrinių kompozicinių priemonių dominavimas. Ypač šiomis programuojančiomis savybėmis pasižymi V. Landsbergio-Žemkalnio pastatai, esantys pačioje Kauno miesto širdyje – Naujamiestyje. Tai pasireiškia tuo, kad šie pastatai yra daugiau miestietiško tipo, aktyviai „bendradarbiauja“ su gretimais pastatais, su visa gatvės erdve. Tolstant nuo centro, pastatuose gausėja vertikalių elementų, daugiau skiriasi atskirų pastato dalių aukštis, siluetas darosi aktyvesnis, dinamiškesnis. Tipologiškai tai būdingi priemiesčių ar užmiesčio pastatų, kurie pretenduoja į lokalinio kompozicinio centro vaidmenį, bruožai. V. LandsbergioŽemkalnio kūryba liudija apie jo sugebėjimą suprasti urbanistinę situaciją ir joje deramai parinkti statinio kompozicinius parametrus, ypač – tankiai užstatytoje aplinkoje, kur solidarumo vaizdinis reprezentavimas yra itin aktualus.


2000 ◽  
Vol 30 (7) ◽  
pp. 1156-1164 ◽  
Author(s):  
F Thomas Ledig ◽  
Basilio Bermejo-Velázquez ◽  
Paul D Hodgskiss ◽  
David R Johnson ◽  
Celestino Flores-López ◽  
...  

Martínez spruce (Picea martínezii T.F. Patterson) is a conifer currently passing through a bottleneck, reduced to a few relict populations totaling less than 800 trees. We used isozyme markers to analyze the mating system and survey the level of genic diversity in two populations. The mating system was characterized by a high frequency of selfing. The multilocus outcrossing rates (tm) and 95% confidence intervals were only 0.399 (0.197 < tm < 0.601) for the smallest population and 0.589 (0.475 < tm < 0.703) or 0.685 (0.465 < tm < 0.905), depending on year, for the largest. These are among the lowest rates of outcrossing observed in conifers. The fixation indices for the two populations were -0.058 and 0.121, less than expected for such high levels of selfing. Expected heterozygosity, unbiased He, based on 22 loci in 13 enzyme systems, was 0.121 and 0.101 in the two populations. The proportion of the total genic diversity between populations, FST, was 2.4%. Nm, the number of migrants per generation, was about 1.00 or 10.17, depending on the method of estimation. The time since the two populations were isolated was estimated from Nei's genetic distance as only 150 to 15 000 years, which is consistent with a hypothesis of population collapse during late Pleistocene or Holocene warming. We discuss the implications for conservation.


2011 ◽  
Vol 54 (4) ◽  
pp. 419-429
Author(s):  
S. Kusza ◽  
S. Mihók ◽  
L. Czeglédi ◽  
A. Jávor ◽  
M. Árnyasi

Abstract. The aim of the study was to provide information on the genetic variability of the Hungarian Bronze turkey gene reserve population and its difference from the Broad-breasted turkey, and offer guidance and proposals for its future conservation strategies. Altogether, 239 Hungarian Bronze turkeys from 10 strains and 13 Broad-breasted turkeys as a control population were genotyped for 15 microsatellites. All loci were polymorphic with the average number of alleles per locus 3.20±1.146 in the Hungarian Bronze turkey. The mean expected (Hexp) and observed heterozygosity (Hobs) were not different (0.392 and 0.376, respectively) in the overall population, and similar values were obtained for hens and bucks and among hen strains. Inbreeding coefficient (FIS) and Shannon index (I) indicated that there was low inbreeding within hens and bucks. Our results confirm that the genetic diversity in the Hungarian Bronze turkey population has been preserved by the rotational mating system. Differences between the Hungarian Bronze turkey and the Broad-breasted turkey populations were determined. Nei’s unbiased values clearly indicated that the two populations are highly genetically differentiated.


Plants ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2402
Author(s):  
Awapa Jirabanjongjit ◽  
Paweena Traiperm ◽  
Tomoki Sando ◽  
Alyssa B. Stewart

Argyreia siamensis is extremely rare, and very little is known about its reproduction. The species has colorful flowers that seem likely to attract pollinators, but population sizes are typically small (<30 individuals). To determine whether poor reproduction contributes to its rarity, we investigated its mating system and potential pollinators in two populations. We also examined the staminal trichomes and floral nectary to investigate their role in pollinator attraction. The mating system was assessed with a bagging experiment and pollinator visits were recorded with action cameras. Additionally, we tested the staminal trichomes and floral nectary for terpenes and flavonoids and examined floral nectary micromorphology via scanning electron microscope and compound light microscope. Our results reveal that A. siamensis is self-incompatible and dependent on pollinators; the western population was pollinated by bees (Meliponini and Amegilla), while the eastern population was mainly pollinated by skipper butterflies (Hesperiidae). Both staminal trichomes and the floral nectary appear to contribute to pollinator attraction through the presence of terpenes and flavonoids (in both secretory structures) and nectariferous tissue and nectarostomata (in the nectary). Our results indicate that A. siamensis has reliable and effective pollinators and that insufficient pollination is likely not a primary cause of its rarity.


Author(s):  
Lasana T. Harris

The first chapter states that flexible social cognition—having the ability to engage and not engage in mental state inferences with others—perhaps explains why people are capable of pro and anti-social behaviour. It introduces a classical equation for social behaviour, before suggesting an edit that equation that accounts for social cognition. It then suggests a metaphor to explain how social cognition might be engaged based on the social context. Next, it defines the key terms for the argument surrounding flexible social cognition: flexible and mental state inference as the most fundamental form of social cognition. It reconciles differences in the use of various psychological jargon for various types of social cognition, then defines social groups, explaining their importance to the general theory.


2004 ◽  
Vol 68 (1) ◽  
pp. 83-88 ◽  
Author(s):  
Jan F. Kamler ◽  
Warren B. Ballard ◽  
Patrick R. Lemons ◽  
Kevin Mote

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