Brief description
In colonial organisms, physical damage or predation can result in the loss of part of the colony. Although the colony may survive, the loss of part of the colony may alter patterns of growth and reproduction. In this study, the response of Bugula neritina, an arborescent bryozoan, to physical damage was tested in three experiments: 1) short term regenerative responses to the removal of zooids from growth tips; ii) growth and reproductive responses to damage imposed at different locations within the colony; and iii) the effects of damage produced by a natural predator, the nudibranch Polycera hedgepethi. This dataset gives the growth response of immature colonies over two weeks following the removal of zooids from growth tips of branches from one side of a colony; the remaining side of the colony was left intact. Immature colonies which had undergone four branching events were used in the experiment. After damage was imposed, colonies were returned to the field site at Williamstown, Victoria. Colony size (branching score) and the proportion of branches with budding tips were measured on damaged and intact sides of each colony for three weeks between January and February 2000. Branch tips resumed budding within a few days of damage being imposed and the proportion of budding tips on the damaged sides of the colonies did not differ from intact sides after two weeks. Damaged sides of colonies were smaller than intact sides two weeks after injury but growth rates were similar by day seven.Lineage
Maintenance and Update Frequency: notPlanned
Statement: To prevent light exposure triggering the release of larvae, mature colonies were kept in a light-tight box for 24 hours after collection. In the laboratory, colonies were placed in continuous flow seawater systems. The release and subsequent settlement of larvae from the colonies was initiated by exposure to a halogen light source. Larvae were allowed to settle on roughened PVC plates (110 mm x 110 mm by 6 mm thick) placed in plastic trays. Growing tips were removed from branches using scissors and a 20 x magnification lamp.
Statement: 1.Source:
a. Dataset: This dataset gives the branching score and the proportion of branches with budding tips on damaged and undamaged sides of Bugula neritina colonies (n= 11-14). Data was collected on 6 occasions over 14 days between late January and early February 2000. Fourteen immature colonies that had undergone four branching events (branching score of 4) were used in the experiment. Growth tips were removed from the branches on one side of the colony with scissors under 20 x magnification - the other side of the colony was left undamaged. PVC plates with colonies attached were positioned at a minimum depth of 2 m adjacent to the Breakwater Pier at Williamstown, Victoria. To reduce exposure to light and sediment accumulation, plates were installed so that the colony faced the sediment. At each measurement period plates were retrieved and immersed in trays of seawater during measurement and then returned. Three colonies died towards the end of the experiment reducing the sample number to 11 colonies. Branching score represents the number of times a branching event had taken place and provides an index of colony growth.
Immature colonies of the same age and size used in the experiment were established by inducing the release and settlement of larvae from mature colonies of Bugula neritina that had been collected from Altona Pier, Port Phillip Bay, Victoria and kept in darkness. The release of larvae from these mature colonies was triggered by exposure to a bright light source within 24 hours of collection. The released larvae were allowed to settle onto roughened PVC plates (0.11 m x 0.11 m x 0.006m thick) placed in trays of seawater.
Data columns in the data set are: Time (0, 2, 4, 7, 9, 11, 12, 14, 24 as days); Colony Identification(1-14) ; Colony Side (undamaged, damaged); Branching score; Proportion of tips budding.
For more details on the methods and experimental design see Bone, E.K.A. & Keough, M.J. (2005) Responses to damage in an arborescent bryozoan: effects of injury location, Journal of Experimental Marine Biology and Ecology, 324:127-140.
b. Scale: Values were measured on both sides of the colony and then averaged across the whole colony.
c. Media Types: Not Relevant
d. Date: Late January to early February 2000
e. Dates of various parts of the process:
2. Processing Steps
a. Intermediate processing steps (after data capture): Not Relevant
b. Methods used to generate final product: Not Relevant
Notes
CreditKeough, M.J., Prof
Created: 02 02 2007
Data time period: 2000-01-22 to 2000-02-04
text: westlimit=144.91414; southlimit=-37.86347; eastlimit=144.91414; northlimit=-37.86347
text: uplimit=2; downlimit=2
Subjects
20 000000 |
20 331013 |
24 424002 |
AQUATIC ECOSYSTEMS |
Altona, Victoria |
Benthic Habitat |
BIOSPHERE |
Biosphere | Ecological Dynamics | Adaptation |
Bryozoa |
Bugula neritina |
Civil Disturbance |
EARTH SCIENCE |
ECOLOGICAL DYNAMICS |
ENVIRONMENTAL IMPACTS |
HUMAN DIMENSIONS |
Oceans | Marine Biology | Marine Invertebrates |
Population Dynamics |
Polycera hedgpethi |
Port Phillip Bay |
SPECIES/POPULATION INTERACTIONS |
Williamstown, Victoria |
biota |
colony damage |
disturbance |
modular organisms |
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Other Information
Identifiers
- global : c59bafd0-0e41-11dc-8c12-00188b4c0af8
