Summer foraging ecology of wapiti (Cervus elaphus roosevelti) in the Mount St. Helens blast zone

1994 ◽  
Vol 72 (2) ◽  
pp. 303-311 ◽  
Author(s):  
Evelyn H. Merrill
Keyword(s):  
Foraging Behavior ◽  
Plant Community ◽  
Cervus Elaphus ◽  
Seasonal Changes ◽  
Foraging Ecology ◽  
Feeding Time ◽  
Breakdown Rates ◽  
Successional Forests ◽  
Blast Zone ◽  
Mount St Helens

Summer–fall foraging behavior of wapiti was studied relative to seasonal changes in forage resources in early successional forests of the Mount St. Helens "blast zone." Seasonal changes in diet, plant community selection, and foraging behavior of wapiti were generally consistent with hypothesized ingestive and processing constraints on a large-bodied ruminant. When high-quality forage was abundant early in the growing season, forbs dominated in wapiti diets probably because of their high digestibility and cell-wall breakdown rates. As forb biomass declined, wapiti initially maintained a high intake of forbs by increasing search rates (m/min). Eventually wapiti switched to grasses, with consequent decreases in feeding time and increases in rumination time. Selection of plant communities by wapiti was related to the standing crop (kg/ha) of forage only in the fall, when grasses were the preferred forage type. Cover and spacing needs during calving and the influence of forage structure on intake rates and plant community selection are discussed.

scholarly journals Seasonal changes in mineral intake and first antler growth in Iberian red deer (Cervus elaphus hispanicus)

2007 ◽  
Vol 6 (sup1) ◽  
pp. 851-851
Author(s):  
L. Estévez ◽  
F. Ceacero ◽  
Landete Castillejos ◽  
A. J. García ◽  
D. Carrión ◽  
...  
Keyword(s):  
Cervus Elaphus ◽  
Seasonal Changes ◽  
Red Deer ◽  
Cervus Elaphus Hispanicus ◽  
Iberian Red Deer ◽  
Antler Growth

scholarly journals Sedimentation in a blast-zone lake at Mount St. Helens, Washington—Implications for varve formation

Geology ◽  
1985 ◽  
Vol 13 (5) ◽  
pp. 348 ◽  
Author(s):  
Roger Y. Anderson ◽  
Edward B. Nuhfer ◽  
Walter E. Dean
Keyword(s):  
Blast Zone ◽  
Mount St Helens

Vegetation change in the Mount St. Helens (U.S.A.) blast zone, 1979–1992

1998 ◽  
Vol 13 (1) ◽  
pp. 75-82 ◽  
Author(s):  
Lisa M.B. Harrington ◽  
John A. Harrington ◽  
Peter M. Frenzen
Keyword(s):  
Vegetation Change ◽  
Blast Zone ◽  
Mount St Helens

scholarly journals Impact of Mount St. Helens Eruption on Bacteriology of Lakes in the Blast Zone

1982 ◽  
Vol 43 (3) ◽  
pp. 664-670 ◽  
Author(s):  
J. T. Staley ◽  
L. G. Lehmicke ◽  
F. E. Palmer ◽  
R. W. Peet ◽  
R. C. Wissmar
Keyword(s):  
Blast Zone ◽  
Mount St Helens

scholarly journals Patterns of foraging activity and fidelity in a southeast Asian flying fox

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Elodie Schloesing ◽  
Rémi Chambon ◽  
Annelise Tran ◽  
Kinley Choden ◽  
Sébastien Ravon ◽  
...  
Keyword(s):  
Foraging Behavior ◽  
Animal Movement ◽  
Foraging Ecology ◽  
Nipah Virus ◽  
Food Resource ◽  
Habitat Type ◽  
Pathogen Transmission ◽  
Foraging Activity ◽  
Residential Areas ◽  
Fruit Bat

Abstract Background Improved understanding of the foraging ecology of bats in the face of ongoing habitat loss and modification worldwide is essential to their conservation and maintaining the substantial ecosystem services they provide. It is also fundamental to assessing potential transmission risks of zoonotic pathogens in human-wildlife interfaces. We evaluated the influence of environmental and behavioral variables on the foraging patterns of Pteropus lylei (a reservoir of Nipah virus) in a heterogeneous landscape in Cambodia. Methods We employed an approach based on animal-movement modeling, which comprised a path-segmentation method (hidden Markov model) to identify individual foraging-behavior sequences in GPS data generated by eight P. lylei. We characterized foraging localities, foraging activity, and probability of returning to a given foraging locality over consecutive nights. Generalized linear mixed models were also applied to assess the influence of several variables including proxies for energetic costs and quality of foraging areas. Results Bats performed few foraging bouts (area-restricted searches) during a given night, mainly in residential areas, and the duration of these decreased during the night. The probability of a bat revisiting a given foraging area within 48 h varied according to the duration previously spent there, its distance to the roost site, and the corresponding habitat type. We interpret these fine-scale patterns in relation to global habitat quality (including food-resource quality and predictability), habitat-familiarity and experience of each individual. Conclusions Our study provides evidence that heterogeneous human-made environments may promote complex patterns of foraging-behavior and short-term re-visitation in fruit bat species that occur in such landscapes. This highlights the need for similarly detailed studies to understand the processes that maintain biodiversity in these environments and assess the potential for pathogen transmission in human-wildlife interfaces.

scholarly journals A Survey of Ant Species in Three Habitats at Mount St. Helens National Volcanic Monument

2012 ◽  
Vol 2012 ◽  
pp. 1-9
Author(s):  
Jessamy J. Rango
Keyword(s):  
Species Richness ◽  
Plant Community ◽  
Plant Architecture ◽  
Vegetation Density ◽  
Focal Species ◽  
Ant Community ◽  
Biotic Recovery ◽  
Mount St Helens

Ants were surveyed in three habitats at Mount St. Helens in 2008. The area most impacted by the 1980 eruption is the Pumice Plain. Less impacted is the Blowdown Zone where trees were toppled due to the blast. Two habitats were surveyed in the Pumice Plain varying in vegetation density (Pumice Plain Low-Vegetation (PPLV) and Pumice Plain High-Vegetation (PPHV)), and one habitat was surveyed in the Blowdown Zone (BDZ). Ten ant species were collected with the most species collected from the BDZ habitat and the least from the PPLV habitat. Ant abundance was higher at the BDZ and PPHV habitats than at the PPLV habitat. Ant biodiversity was highest at the BDZ habitat than at the PPHV and PPLV habitats. Significant correlations between ant community parameters and plant community parameters were also found. Few plants in the PPLV habitat may contribute to the lack of ants. High ant species richness at the BDZ habitat may be due to complex plant architecture. Results from this study suggest that ants are important focal species in tracking biotic recovery following disturbances.

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