Search Results - (Author, Cooperation:O. Iribarne)
-
1Latest Papers from Table of Contents or Articles in PressE. T. Borer ; E. W. Seabloom ; D. S. Gruner ; W. S. Harpole ; H. Hillebrand ; E. M. Lind ; P. B. Adler ; J. Alberti ; T. M. Anderson ; J. D. Bakker ; L. Biederman ; D. Blumenthal ; C. S. Brown ; L. A. Brudvig ; Y. M. Buckley ; M. Cadotte ; C. Chu ; E. E. Cleland ; M. J. Crawley ; P. Daleo ; E. I. Damschen ; K. F. Davies ; N. M. DeCrappeo ; G. Du ; J. Firn ; Y. Hautier ; R. W. Heckman ; A. Hector ; J. HilleRisLambers ; O. Iribarne ; J. A. Klein ; J. M. Knops ; K. J. La Pierre ; A. D. Leakey ; W. Li ; A. S. MacDougall ; R. L. McCulley ; B. A. Melbourne ; C. E. Mitchell ; J. L. Moore ; B. Mortensen ; L. R. O'Halloran ; J. L. Orrock ; J. Pascual ; S. M. Prober ; D. A. Pyke ; A. C. Risch ; M. Schuetz ; M. D. Smith ; C. J. Stevens ; L. L. Sullivan ; R. J. Williams ; P. D. Wragg ; J. P. Wright ; L. H. Yang
Nature Publishing Group (NPG)
Published 2014Staff ViewPublication Date: 2014-03-29Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: *Biodiversity ; Climate ; Eutrophication/drug effects/*radiation effects ; Geography ; Herbivory/*physiology ; Human Activities ; Internationality ; *Light ; Nitrogen/metabolism/pharmacology ; Plants/drug effects/*metabolism/*radiation effects ; *Poaceae/drug effects/physiology/radiation effects ; Time FactorsPublished by: -
2Articles: DFG German National LicensesStaff View
ISSN: 0022-0981Keywords: Cancer magister ; Competition ; Habitat ; Interaction ; Juvenile crabSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyType of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesStaff View
ISSN: 1432-1793Source: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract This study shows that population structure affects guarding time in the amphipod Eogammarus oclairi Bousfield. In the laboratory, mean guarding time depended on the male weight-frequency distribution, operational sex ratio, and male density. It was longer when the male population encompassed a broad range of weights than when the weight distribution was narrower; however, guarding time did not differ when the population's weight distribution was narrow and composed of either small or large males. Mean guarding time varied between a few hours when the operational sex ratio (male:female) was 1:3 to〉7 d when the sex ratio was 2:1. It was also affected by male density, increasing as male density increased. The results suggest that the stimulus to guard depends on the intensity of male-male competition.Type of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesStaff View
ISSN: 1432-1793Source: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract Diel molting cycles of megalopae and first instar Dungeness crabs Cancer magister Dana captured in the Grays Harbor estuary (46° 55′N; 124° 05′ W) in May 1991 were studied under laboratory conditions. Sixtyone percent of the megalopae and 76% of the first instar crabs molted during periods of ambient darkness under a normal light — dark diel regime, and molting pattern was not affected by changes in the photoperiod (24 h daylight or 24 h darkness). Time until metamorphic molt increased as conspecific density increased. Habitat type (shell or mud) did not affect time until molt of megalopae and first instar crabs, nor did it affect daily molting rhythm of first instars. We hypothesize that nightly ecdysis of megalopae and first instar Dungeness crabs and density-dependent molting may be an adaptive response to predation and cannibalism among young-of-the-year.Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 1432-1793Source: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract The importance of oyster-shell habitat-characteristics (depth of the shell layer or degree of fragmentation) to the amphipodEogammarus oclairi were studied in Grays Harbor estuary (Washington, USA) in regard to their effect on local density ofE. oclairi, the risk of predation by juvenile Dungeness crabsCancer magister, and the opportunity for selection on body weight during pairing.E. oclairi was the most abundant macrofaunal species in the intertidal oyster-shell assemblages (density range = 20 to 8500 amphipods m−2), and its density was positively correlated with the depth of the oyster-shell layer (r = 0.85,n = 30,p 〈 0.005). Field experiments showed that amphipod density was much lower when oyster shells were whole (x = 340.7 ± 72.1,n = 10) as opposed to fragmented [x = 41.4 ± 9.3,n = 10;t c (Welch's approximatet-test) = 13.0,df = 9.3,p 〈 0.05]. Densities of a predator, juvenileC. magister, were not affected by depth of the shell layer nor by degree of fragmentation (whole shell,x = 14.6 ± 13.0 crab;fragmented shell,x = 18.7 ± 2.4 crab;t c = 0.83,df = 9.7,p 〉 0.05). Predation rate on single amphipods by crabs did not differ between habitat types (whole shells vs fragmented shells), but mating pairs were consumed more often in the whole-shell treatment (whole shell,x = 0.9 ± 0.8, fragmented shell,x = 0.1 ± 0.3). There were no differences in the size of single amphipods (both sexes) consumed between treatments, or in the size of the paired males consumed. Field experiments showed that the opportunity for selection (i) on male body weight increased with increasing amphipod density which, in turn, increased with increasing degree of shell fragmentation (whole-shell treatment,i = 0.0014 ± 0.0002, fragmented-shell treatment,i = 0.3756 ± 0.0338). Large spatial and temporal fluctuations in population abundance complicate the evaluation of the importance of selection in determining traits such as body weight.Type of Medium: Electronic ResourceURL: