Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Daniel A. Leger"'
Autor:
Daniel D. Leger
Publikováno v:
American Political Thought. 3:370-372
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::53e6bdb322dc432e0c61afaa29e8d155
https://doi.org/10.1086/677548
https://doi.org/10.1086/677548
Autor:
Donald H. Owings, Daniel W. Leger
Publikováno v:
Zeitschrift für Tierpsychologie. 54:163-184
Multiple-note chatter vocalizations, recorded in the field, occurred in response to mammals, snakes, raptors, and during agonistic chases. Discriminant function analyses of sonagram-derived data revealed that: (1) Chatters evoked by terrestrial preda
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2c56c4241c26a15fc9b7c02ba02a7daa
https://doi.org/10.1111/j.1439-0310.1980.tb01070.x
https://doi.org/10.1111/j.1439-0310.1980.tb01070.x
Publikováno v:
Zeitschrift für Tierpsychologie. 52:227-246
California ground squirrel single-note vocalizations were recorded in the field, then analyzed spectrographically. These calls were elicited by low-flying raptors and by larger mammals; they were also emitted by the participants of agonistic chases.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1e0c68dc9b37401141a4e1f41876b56b
https://doi.org/10.1111/j.1439-0310.1980.tb00714.x
https://doi.org/10.1111/j.1439-0310.1980.tb00714.x
Autor:
Daniel W. Leger, Cody L. Arenz
Publikováno v:
Ethology. 103:945-953
Visual antipredator vigilance was predicted to increase in the presence of visual obstructions that do not otherwise provide cover. This hypothesis was tested using 13-lined ground squirrels as they fed in four Plexiglas boxes that varied in the exte
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::404fae22ff2a8357ea14624f296dad54
https://doi.org/10.1111/j.1439-0310.1997.tb00136.x
https://doi.org/10.1111/j.1439-0310.1997.tb00136.x
Publikováno v:
Zeitschrift für Tierpsychologie. 49:142-155
In the field, we videotaped the reactions of squirrels to playbacks of 1, 3 and 5 whistle vocalizations at two sound intensities differing by 10 dB. The squirrels reacted by running to boulders or burrows and freezing. As time progressed following pl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a19caa69056a4aa53c9c71d85cf704a1
https://doi.org/10.1111/j.1439-0310.1979.tb00283.x
https://doi.org/10.1111/j.1439-0310.1979.tb00283.x
Autor:
Daniel W. Leger
Publikováno v:
The Condor. 107:765-774
Birds with songs having two or more acoustically distinct elements can arrange them either rigidly (i.e., in the same sequence) or flexibly. Flexible song syntax can be achieved either by varying the number of repetitions of elements or by combining
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::82f02c53177fe0838b2b63e5dd857464
https://doi.org/10.1093/condor/107.4.765
https://doi.org/10.1093/condor/107.4.765
Autor:
Daniel W. Leger, D. James Mountjoy
Publikováno v:
Behavioral Ecology. 12:98-102
Previous studies have found a relationship between migration and the degree of elaboration of sexually selected traits, but investigators have differed in the mechanisms they proposed to account for this association. We examined the relationship betw
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9b2a98d58dd6a3deaea67c6ca6d8aca6
https://doi.org/10.1093/oxfordjournals.beheco.a000385
https://doi.org/10.1093/oxfordjournals.beheco.a000385
Publikováno v:
The Auk. 117:1038-1042
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8f81218deb0f99869294cf36f96eddf9
https://doi.org/10.1093/auk/117.4.1038
https://doi.org/10.1093/auk/117.4.1038
Autor:
Cody L. Arenz, Daniel W. Leger
Publikováno v:
Ethology. 105:807-816
Despite the success of antipredator vigilance research, the specific focus of this vigilance has been difficult to determine. We have previously shown that thirteen-lined ground squirrels (Spermophilus tridecemlineatus) increase their vigilance when
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::500a33079f2bea97bb09543dab1e4273
https://doi.org/10.1046/j.1439-0310.1999.00458.x
https://doi.org/10.1046/j.1439-0310.1999.00458.x
Autor:
Cody L. Arenz, Daniel W. Leger
Publikováno v:
Behaviour. 134:1101-1114
Antipredator vigilance behaviour is affected by a number of variables, but studies reporting experimental manipulation of visual obstructions are generally lacking in the literature. We examined the individual antipredator behaviour of free-ranging t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::49630fd099d0cfffd77526643a42a745
https://doi.org/10.1163/156853997x00421
https://doi.org/10.1163/156853997x00421