Canadian Journal of Zoology
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Experimental evidence of size-dependent predation mortality in juvenile yellow perch Adult yellow perch, Perca flavescens, when offered equal numbers of small (52 – 59 mm total length) and large (66 – 73 mm total length) conspecifics, selected more small than large prey in 9 of 11 laboratory feeding trials. The small and large groups were selected from the smallest 40% and largest 15% of a natural length–frequency distribution of young-of-the-year yellow perch captured in... ... hiện toàn bộ
Canadian Journal of Zoology - Tập 67 Số 2 - Trang 521-523 - 1989
The implications of bite performance for diet in two species of lacertid lizardsOne of the performance features that is generally considered crucial to increasing the potential prey spectrum of lizards is bite capacity. In this study we tested whether bite forces may serve as a basis for diet selection in two syntopically occurring lacertid lizards. We did so by measuring bite forces in vivo for a large sample of lizards of the species Podarcis muralis and Lacerta viv... ... hiện toàn bộ
Canadian Journal of Zoology - Tập 79 Số 4 - Trang 662-670 - 2001
The ultrastructure of the spermatozoa of the worm lizard <i>Amphisbaena alba</i> (Squamata, Amphisbaenidae) and the phylogenetic relationships of amphisbaenians
Canadian Journal of Zoology - Tập 77 Số 8 - Trang 1254-1264 - 1999
OBSERVATIONS ON EXPERIMENTAL INFECTIONS WITH ECHINOCOCCUS IN RODENTS Experimental infections in rodents with Echinococcus multilocularis sibiricensis, Echinococcus granulosus canadensis, and Echinococcus granulosus (Lebanon origin) both by ingestion of onchospheres and by parenteral injection are recorded. The microscopic anatomy of the larval parasite and of the host reaction are discussed and illustrated in detail. Voles and cotton rats display little re... ... hiện toàn bộ
Canadian Journal of Zoology - Tập 39 Số 6 - Trang 877-891 - 1961
Efficiency of filter feeding of black fly larvae (Diptera: Simuliidae) Larvae of nine species of black flies were exposed to synthetic particles in the laboratory. Sizes and concentrations of particles were chosen to simulate natural conditions. Smaller particles (diameter 5–10 μm) were offered at a rate of 50–100/cephalic fan area per second, and larger ones (diameter approximately 150 μm) at 0.3–1.0/cephalic fan area per second. Experiments were conducted ... ... hiện toàn bộ
Canadian Journal of Zoology - Tập 56 Số 7 - Trang 1608-1623 - 1978
Response of stream benthos and drift to fine sediment deposition versus transport Field experiments were conducted to investigate the responses of benthic macroinvertebrate communities to experimental additions of fine sediments into riffles having a flow with either low tractive force so the sediments were deposited or sufficient tractive force to transport the added sediments. Sediment deposition had no measurable impact on most taxa, the only negative effects being ... ... hiện toàn bộ
Canadian Journal of Zoology - Tập 64 Số 6 - Trang 1345-1351 - 1986
Diving and foraging behavior of leatherback sea turtles (Dermochelys coriacea) Remote time–depth recorders (TDR) were deployed on six gravid leatherbacks nesting on Sandy Point, St. Croix. Dive behavior was monitored continuously for each turtle during internesting intervals ranging from 9 to 11 days. Dive duration averaged 9.9 min/dive (SD = 5.3, n = 5096); mean depth was 61.6 m (SD = 59.1, n = 5096). One turtle dived twice beyond the range of her TDR to depths we ... ... hiện toàn bộ
Canadian Journal of Zoology - Tập 67 Số 11 - Trang 2834-2840 - 1989
Agonistic behavior among mountain goats foraging in winter During two winters we studied agonistic behavior of foraging mountain goats (Oreamnos americanus) in both natural and manipulated conditions. By maintaining food pellets at bait site we tested two hypotheses: (i) dominant goats will have primary access to the food, and (ii) kids of dominant nannies will have access to the food with their mothers. At the bait site, average group size was l... ... hiện toàn bộ
Canadian Journal of Zoology - Tập 66 Số 11 - Trang 2585-2588 - 1988
Functional aspects of maternal aggression in mammals Evidence from several species of mammals suggests that the observed increase in female aggressiveness during lactation is aimed at protecting offspring from conspecifics. Whereas in rodents maternal aggression seems to constitute a deterrent against infanticidal behavior by adult males and females, in pinnipeds and primates its most likely function is to protect infants from general haras... ... hiện toàn bộ
Canadian Journal of Zoology - Tập 70 Số 6 - Trang 1069-1077 - 1992
Mountain goat recruitment: kid production and survival to breeding age During a 5-year study of a marked population of mountain goats (Oreamnos americanus) in west-central Alberta, 5 of 17 females produced their first kid at 4 years of age, while most females did not reproduce until 5 years of age. Twinning accounted for 2% of births. Survival of kids to 1 year averaged 60%, and survival of females from 1 to 4 years of age was 52%. Most deaths of kids occurr... ... hiện toàn bộ
Canadian Journal of Zoology - Tập 72 Số 1 - Trang 22-27 - 1994
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