Determining metapopulation persistence requires understanding both demographic rates and patch connectivity. Persistence is well understood in theory but has proved challenging to test empirically ...for marine and other species with high connectivity that precludes classic colonisation–extinction dynamics. Here, we assessed persistence for a yellowtail anemonefish (Amphiprion clarkii) metapopulation using 7 years of annual sampling data along 30 km of coastline. We carefully accounted for uncertainty in demographic rates. Despite stable population abundances through time and sufficient production of surviving offspring for replacement, the pattern of connectivity made the metapopulation unlikely to persist in isolation and reliant on immigrants from outside habitat. To persist in isolation, the metapopulation would need higher fecundity or to retain essentially all recruits produced. This assessment of persistence in a marine metapopulation shows that stable abundance alone does not indicate persistence, emphasising the necessity of assessing both demographic and connectivity processes to understand metapopulation dynamics.
We assessed persistence for a yellowtail anemonefish (Amphiprion clarkii) metapopulation using seven years of annual sampling data along 30 km of coastline. Despite stable population abundances through time and sufficient production of surviving offspring for replacement, the pattern of connectivity made the metapopulation unlikely to persist in isolation and reliant on immigrants from outside habitat. This assessment of persistence in a marine metapopulation shows that stable abundance alone does not indicate persistence, emphasizing the necessity of assessing both demographic and connectivity processes to understand metapopulation dynamics.
In this research, we investigate how grittier individuals might incur some costs by persisting when they could move on. Grittier participants were found to be less willing to give up when failing ...even though they were likely to incur a cost for their persistence. First, grittier participants are more willing to risk failing to complete a task by persisting on individual items. Second, when they are losing, they expend more effort and persist longer in a game rather than quit. Gritty participants have more positive emotions and expectations toward the task, which mediates the relationship between grit and staying to persist when they are losing. Results show gritty individuals are more willing to risk suffering monetary loss to persist.
Through the Eyes of Students Tinto, Vincent
Journal of college student retention : Research, theory & practice,
11/2017, Letnik:
19, Številka:
3
Journal Article
Recenzirano
For years, our prevailing view of student retention has been shaped by theories that view student retention through the lens of institutional action and ask what institutions can do to retain their ...students. Students, however, do not seek to be retained. They seek to persist. The two perspectives, though necessarily related, are not the same. Their interests are different. While the institution’s interest is to increase the proportion of their students who graduate from the institution, the student’s interest is to complete a degree often without regard to the institution in which it is earned. Although there has been much written from the former point of view, much less has been written from the latter. This article seeks to address this imbalance by laying out a conceptual model of student institutional persistence as seen through the eyes of students. Having done so, the article asks what such a model implies about institutional action to promote student persistence.
In July 2021, we conducted environmental sampling at the residence of a person in Dallas, Texas, USA, who had travel-associated human West African monkeypox virus (MPXV-WA). Targeted environmental ...swab sampling was conducted 15 days after the person who had monkeypox left the household. Results indicate extensive MPXV-WA DNA contamination, and viable virus from 7 samples was successfully isolated in cell culture. There was no statistical difference (p = 0.94) between MPXV-WA PCR positivity of porous (9/10, 90%) vs. nonporous (19/21, 90.5%) surfaces, but there was a significant difference (p<0.01) between viable virus detected in cultures of porous (6/10, 60%) vs. nonporous (1/21, 5%) surfaces. These findings indicate that porous surfaces (e.g., bedding, clothing) may pose more of a MPXV exposure risk than nonporous surfaces (e.g., metal, plastic). Viable MPXV was detected on household surfaces after at least 15 days. However, low titers (<10
PFU) indicate a limited potential for indirect transmission.
Background and purpose: Perseverance is related to many personality, behavioral and educational variables, and hence the need for a questionnaire in Persian language to measure perseverance is felt. ...This research was conducted with the aim of standardizing and examining the psychometric properties of the Persian version of the Persistence Questionnaire. Methods: The current research is practical in terms of purpose. In terms of the type of survey data collection and in terms of methodology, it is considered as a test-making study, which has been carried out in the general format of a descriptive research project. The statistical population in this research included all managers and employees of non-governmental organizations in Tehran in 1401. The research sample included 865 managers and employees who were selected by cluster method. The data was collected using Duckworth (2008) perseverance questionnaire. In this research, correlation methods, goodness of fit study, factor analysis and reliability analysis (Cronbach's alpha method) were used. Data were analyzed using LISREL 8.80 and SPSS.22 software. Results: Based on the data analysis, the current research identified 2 factors (interest and effort) that explain 60.92% of the persistence variable. The results of confirmatory factor analysis showed that the fit indices of the model are in a favorable condition. In addition, Cronbach's alpha coefficient for the subscales was calculated between 0.74 and 0.82. Conclusion: According to the appropriate statistical analyzes and the results, it seems that the Persian version of the persistence questionnaire (Grit-S) has good validity and reliability and can be considered an efficient tool in this field.
