Brief description
This study examines the effects of trampling on rocky intertidal platforms dominated by the brown algae Hormosira banksii. This dataset gives the percent cover of Hormosira banskii in response to four levels of experimental trampling applied over six summers, between 1991 and 1996, within Point Nepean National Park, Victoria. Two sites were located at Cheviot Beach (Harry's Pool, Cheviot Mid) and one at Grenade Range (Grenade Range). The percent cover of Hormosira banskii in each experimental strip of shoreline was assessed bi-annually for six years. Hormosira banksii was affected by trampling but the response varied with location. At Cheviot beach periodic disturbance produced a pulse response in the cover of Hormosira, but responses to a given level of trampling varied among years. At Grenade Range there was little recovery between trampling periods after two years and by this time Hormosira was almost eliminated at the highest level of trampling.Lineage
Maintenance and Update Frequency: notPlanned
Statement: Quadrats (0.70 m x 0.35 m) were photographed using slide film or Video-8. Percent cover was calculated by superimposing 100 randomly placed dots on projected images of the sampled quadrats.
Statement: 1.Source:
a. Dataset: This data set gives the percent cover of the brown algae Hormosira banskii in response to four levels of experimental trampling applied over six summers, between 1991 and 1996. Trampling levels were 0, 5, 10 and 25 passages per day; a passage represents a single walk over a strip of shoreline. Trampling treatments were applied on 6-8 occasions during low-tide over summer. Each of the four levels of trampling were applied to two replicate strips of shoreline (0.5 m x 2-3 m long) within each of two plots (~ 10 m x 3 m) at each of three sites (Harrys Pool, Cheviot Mid, Grenade Range). Sites were located at either Cheviot Beach (Harry's Pool and Cheviot Mid) or at Grenade Range, ~ 1 km apart. The percent cover of Hormosira banskii in each experimental strip of shoreline was assessed bi-annually for six years using quadrats (0.70 m x 0.35 m) . Each year sampling was carried out in early summer, before trampling was applied, and at Easter, at the end of each trampling application. Samples collected at Easter reflect the effects of trampling whilst those collected in early summer reflect recovery from trampling.
Data columns in the data set are:
Place (C, Cheviot Beach; G, Grenade Range); Site (CM, Cheviot Mid; HP, Harry's Pool; GR, Grenade Range); Plot (CMSea, Cheviot Mid Sea; CMShore, Cheviot Mid Shore; GRE, Grenade Range East, GRW, Grenade Range West; HPE, Harry's Pool East; HPW, Harry's Pool West); Trampling (1, 0 passages; 2, 5 passages, 3, 10 passages, 4, 25 passages);
H1-Hx give the percent cover of Hormosira banksii at different times since the first census. The column H1 gives percent cover prior to trampling in January 1991. All integers represent months following the first census (i.e. H5 is Hormosira cover in May 1991).
For more details on the methods and experimental design see Keough, M.J. and Quinn, G.P. 1998. Effects of periodic disturbances from trampling on rocky intertidal algal beds. Ecological Applications 8(1): 141-161.
b. Scale: Percent cover of Hormosira banskii within 0.70 m x 0.35 m quadrats
c. Media Types: Not Relevant
d. Date: 1991-1996
e. Dates of various parts of the process: Sampling was carried out biannually from 1991 to 1996. Each year sampling was carried out at the beginning of summer, prior to trampling, and again after Easter, after the last trampling event. Sampling in summer reflects the extent of recovery from the trampling applied in the previous season. Sampling after Easter reflects the effects of trampling.
2. Processing Steps
a. Intermediate processing steps (after data capture): Sampling quadrats were photographed using slide film or Video-8; cover was then calculated by superimposing 100 randomly placed dots on projected images of the quadrats.
b. Methods used to generate final product: Not Relevant
Notes
CreditThis project was supported by the Australian Research Council (ARC).
Credit
Permission to work at Point Nepean National Park was given by the National Parks Service.
Permission to work at Point Nepean National Park was given by the National Parks Service.
Credit
The Australian Bureau of Meteorology and the National Tidal Facility provided data on air temperature and tides, respectively.
The Australian Bureau of Meteorology and the National Tidal Facility provided data on air temperature and tides, respectively.
Credit
A number of people assisted with data collection including Nick Gust, Michael Holloway, Laura Stuart, Michael Shirley and Jim Radford.
A number of people assisted with data collection including Nick Gust, Michael Holloway, Laura Stuart, Michael Shirley and Jim Radford.
Purpose
This study was carried out to assess if trampling by humans alters the cover of Hormosira banskii in rocky intertidal shores
This study was carried out to assess if trampling by humans alters the cover of Hormosira banskii in rocky intertidal shores
Created: 19 01 2007
Data time period: 12 1990 to 31 01 1996
text: westlimit=144.666; southlimit=-38.314; eastlimit=144.666; northlimit=-38.314
Subjects
54 100001 |
Biosphere | Ecological Dynamics | Adaptation |
Biosphere | Vegetation | Macroalgae |
Civil Disturbance |
EARTH SCIENCE |
ENVIRONMENTAL IMPACTS |
HUMAN DIMENSIONS |
Hormosira banksii |
Mornington Peninsula, Victoria |
Oceans | Marine Biology | Marine Plants |
Point Nepean National Park |
biota |
coverage |
experimental_method |
periodic |
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Other Information
Identifiers
- global : e769f830-0cc3-11dc-ab27-00188b4c0af8
