Occupancy and detection of Yellow Perch in Great Lakes coastal wetlands

Accurately estimating the distribution of a species is important for managing sustainable populations of fishes. The Yellow Perch Perca flavescens is an important sport fish in the Great Lakes region and one of the most abundant fishes in Great Lakes coastal wetlands, which they commonly use for spawning and nursery habitat. Many fisheries management decisions are based on results from sampling fish assemblages, but these methods rarely account for incomplete detection (i.e., presence of a species that is not detected by sampling), which could create biased results. We applied the method of occupancy modeling, which accounts for incomplete detection, to Yellow Perch presence/absence data from coastal wetlands across all five Great Lakes. We used occupancy models with environmental variables to predict the detection probability of fyke-net sampling and the occupancy of Yellow Perch under different environmental conditions. We found that both detection probability and occupancy of Yellow Perch varied among Great Lakes and with changes in other environmental variables. The best statistical model included sampling depth, specific conductivity, wetland hydrologic connection, and Great Lake basin. Yellow Perch occupancy was predicted to be highest in areas with greater depth, lower specific conductivity, and a riverine connection to a Great Lake. All naïve occupancy estimates were lower than the occupancy estimates predicted by our models. Our base model with no covariates predicted an occupancy of 0.68 and detection probability of 0.669 across all sites. Our results predict which coastal wetland habitats were preferred by Yellow Perch (i.e., those with low specific conductivity and greater depth) and emphasize the importance of incorporating detection probability into occupancy estimates. Our results can help provide support for the conservation of coastal wetlands with preferred Yellow Perch habitat, and guidance for future coastal wetland restoration projects

Choosing quality multicultural literature for use in a general classroom

The history of multicultural education has changed from the conception of it in the 1960\u27s until now. It emerged primarily in the 1960\u27s, initially in response to cultural deprivation theory. Today, however, multicultural education is linked to cultural diversity. Most teachers use multicultural education and literature only if they have a diverse population; however, the belief is that all students need to experience diversity. Multicultural literature may help not only students to broaden their knowledge and information about others, but may also provide teachers with new ideas and perspectives

Vriendschappen tussen jong en oud in 25 Europese landen

_Cross-age friendships in 25 European countries_ This paper focuses on individual and country-level circumstances shaping friendships between young and old to gain insight into conditions for intergenerational solidarity. Using European Social Survey data, findings show that relatively few people have cross-age friendships (18% of the young and 31% of the old). As predicted by the ‘meeting principle’, individuals who operate in settings where there are opportunities for meaningful interactions with people belonging to a different age group are more likely to have cross-age friendships. As predicted by the ‘disposition principle’, individuals with more favourable feelings about other age groups are more likely to have cross-age friendships. Neither the Active Ageing Index nor macro-level trust and individualism show significant associations with the likelihood of having cross-age friendships. Apparently, conditions that bring generations together are meeting opportunities at the local level, underscoring the importance of decentral

Cross-age friendship in 25 European countries

This paper focuses on individual and country-level circumstances shaping friendships between young and old to gain insight into conditions for intergenerational solidarity. Using European Social Survey data, findings show that relatively few people have cross-age friendships (18% of the young and 31% of the old). As predicted by the “meeting principle”, individuals who operate in settings where there are opportunities for meaningful interactions with people belonging to a different age group are more likely to have cross-age friendships. As predicted by the “disposition principle”, individuals with more favourable attitudes towards other age groups are more likely to have cross-age friendships. Neither the Active Ageing Index nor macro-level trust show significant associations with the likelihood of having cross-age friendships. Apparently, conditions that bring generations together are at the local level, underscoring the importance of decentralized initiatives aimed at increased contact and co-operation across age groups

Are societies with a high value on the Active Ageing Index more age-integrated?

Combining round four data from the European Social Survey (ESS) with indicators of Active Ageing, we examine conditions conducive to age integration. We use both a behavioural and an attitudinal measure of age integration: the prevalence of cross-age friendships and low levels of ageism. The analyses focus on both “young” (age 18 to 30) and “old” (ages 70 to 90). Interestingly, high levels of independence, health and security in late life, and greater capacity to actively age rather than high levels of working, volunteering, caring and political engagement among the old create the greatest opportunities for meaningful cross-age interactions. These findings suggest that quality of life, well-being and autonomy contribute to a general atmosphere facilitating sustained familiarity of the old with the young. Caution is advised in equating high levels of active engagement among the elderly with conditions enabling durable interactions between young and old, thereby promoting a better understanding of people of different ages. “Productive ageing” will in and of itself not lead to greater age integration

Onder vier ogen

Uit het NKPS-onderzoek blijkt dat bij meer dan de helft van alle ouder-kind relaties wekelijks sprake is van face-to-face contact.Bij vijf procent is er helemaal geen contact.Zes procent van de moeders en negen procent van de vaders heeft het contact met ten minste één kind verbroken. Het aantal contacten per kind neemt rechtlijnig af met de grootte van de kinderschare

Observation of generalized synchronization of chaos in a driven chaotic system

We report on the experimental observation of the generalized synchronization of chaos in a real physical system. We show that under a nonlinear resonant interaction, the chaotic dynamics of a single mode laser can become functionally related to that of a chaotic driving signal and furthermore as the coupling strength is further increased, the chaotic dynamics of the laser approaches that of the driving signal.Tang, D. Dykstra, R. ; Hamilton, M. ; Heckenberg, N