scholarly journals Colonization of novel algal habitats by juveniles of a marine tube-dwelling amphipod

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e10188
Author(s):  
Marilia Bueno ◽  
Glauco B.O. Machado ◽  
Fosca P.P. Leite
Keyword(s):  
Population Dynamics ◽  
Field Experiment ◽  
Habitat Quality ◽  
Patch Size ◽  
Weak Effect ◽  
Important Process ◽  
High Quality ◽  
Dispersal Agent ◽  
Sargassum Filipendula ◽  
Successful Colonization

Background Dispersal is an important process affecting population dynamics and connectivity. For marine direct developers, both adults and juveniles may disperse. Although the distribution of juveniles can be initially constrained by their mothers’ choice, they may be able to leave the parental habitat and colonize other habitats. We investigated the effect of habitat quality, patch size and presence of conspecific adults on the colonization of novel habitats by juveniles of the tube-dwelling amphipod Cymadusa filosa associated with the macroalgal host Sargassum filipendula. Methods We tested the factors listed above on the colonization of juveniles by manipulating natural and artificial plants in both the field and laboratory. Results In the laboratory, juveniles selected high-quality habitats (i.e., natural alga), where both food and shelter are provided, when low-quality resources (i.e., artificial alga) were also available. In contrast, habitat quality and algal patch size did not affect the colonization by juveniles in the field. Finally, the presence of conspecific adults did not affect the colonization of juveniles under laboratory condition but had a weak effect in the field experiment. Our results suggest that C. filosa juveniles can select and colonize novel habitats, and that such process can be partially affected by habitat quality, but not by patch size. Also, the presence of conspecifics may affect the colonization by juveniles. Successful colonization by this specific developmental stage under different scenarios indicates that juveniles may act as a dispersal agent in this species.

Population Dynamics of Agouti and Albino Meadow Voles in High-Quality, Grassland Habitats

1995 ◽  
Vol 76 (4) ◽  
pp. 1013-1019 ◽  
Author(s):  
J. D. Peles ◽  
M. F. Lucas ◽  
G. W. Barrett
Keyword(s):  
Population Dynamics ◽  
High Quality ◽  
Meadow Voles ◽  
Grassland Habitats

The Impact of Payment and Respondents’ Participation on Interviewers’ Accuracy in Face-to-face Surveys

Field Methods ◽  
2018 ◽  
Vol 30 (4) ◽  
pp. 295-311
Author(s):  
Natalja Menold ◽  
Uta Landrock ◽  
Peter Winker ◽  
Nathalie Pellner ◽  
Christoph J. Kemper
Keyword(s):  
Field Experiment ◽  
Survey Data ◽  
Task Difficulty ◽  
Quality Data ◽  
Cooperative Group ◽  
Willingness To Participate ◽  
High Quality ◽  
Face To Face ◽  
The Impact

In face-to-face interviews, accurate work by interviewers is crucial for ensuring high-quality survey data. In a field experiment, payment of interviewers, legitimation of falsification behavior, and respondents’ willingness to participate were experimentally varied. The impact of these factors on interviewers’ accuracy during fieldwork was investigated. Low accuracy was operationalized, for instance, as noncompliance with the instructions concerning contacting and recruitment. In addition, falsifications by interviewers were investigated. There were fewer deviations from prescribed routines, and interviewers’ work was of higher quality if the interviewers were paid per hour and when respondents belonged to the cooperative group, compared to break-offs. We conclude that high task difficulty may lead to a decrease of interviewers’ accuracy. Payment per hour seems to ensure higher-quality data and should be preferred.

scholarly journals Heterospecific song quality as social information for settlement decisions: an experimental approach in a wild bird

2019 ◽  
Author(s):  
Jennifer Morinay ◽  
Jukka T. Forsman ◽  
Blandine Doligez
Keyword(s):  
Habitat Selection ◽  
Habitat Quality ◽  
Social Information ◽  
Great Tit ◽  
Social Cues ◽  
Breeding Habitat ◽  
Site Quality ◽  
Ficedula Albicollis ◽  
High Quality ◽  
Local Habitat

AbstractAssessing local habitat quality via social cues provided by con- or heterospecific individuals sharing the same needs is a widespread strategy of social information use for breeding habitat selection. However, gathering information about putative competitors may involve agonistic costs. The use of social cues reflecting local habitat quality acquired from a distance, such as acoustic cues, could therefore be favoured. Bird songs are conspicuous signals commonly assumed to reliably reflect producer quality, and thereby local site quality. Birds of different species have been shown to be attracted to breeding sites by heterospecific songs, but whether they can use fine heterospecific song features as information on producer (and by extension habitat) quality remains unknown. We used a playback experiment in a wild population of collared flycatchers (Ficedula albicollis), a species known to eavesdrop on dominant great tits’ (Parus major) presence and performance, to test whether flycatchers preferred to settle near broadcasts of a high quality great tit song (i.e. song with large repertoire size, long strophes, high song rate), a low quality great tit song or a chaffinch song (control). Among old females, aggressive ones preferred to settle near broadcasts of high quality tit song and avoided broadcasts of low quality tit song, while less aggressive females preferred to settle near broadcasts of low quality tit song. Male personality or age did not influence settlement decisions. Our results show that collared flycatcher females use great tit song quality features as information for settlement decisions, though differently depending on their own competitive ability and/or previous experience with great tit songs. Our study therefore further illustrates the complex condition-dependent use of heterospecific social information for breeding habitat selection.

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