Brief description
For colonial organisms physical damage or predation can result in the loss of part of the colony. Although the colony may survive, 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 and reproductive responses of B. neritina colonies over a four week period in February 2000 following three treatments: i) a single predation event by P. hedgepethi; ii) an imitation predation event and iii) no damage. Each of the three experimental treatments was carried out on twenty immature B. neritina colonies under laboratory conditions; the colonies were then returned to the field site at Williamstown, Victoria. Neither predation by P. hedgepethi nor imitation predation resulted in any significant change in growth, onset of reproduction or reproductive output in B. neritina.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 after collection. In the laboratory colonies were placed in a continuous flow seawater system. The release and subsequent settlement of larvae from the colonies was initiated by exposure to a halogen light source. Larvae were allowed to settled 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 i) branching score; ii) change in branching score; iii) proportion of colonies reproductive and iv) number of ovicells per branching score for Buluga neritina colonies at weekly intervals for four weeks following three predation treatments: no predation (control); ii) predation by the nudibranch Polycera hedgepethi and iii) mock nudibranch predation. Sixty colonies were established from larvae settled onto four PCV plates, with 15 colonies on each plate (see below). Each of the three treatments was applied to five colonies on each of the four plates, so that in total each treatment was replicated 20 times. At the time of treatment colonies were immature and on average had undergone six branching events. A nudibranch that had been starved for 24 hours was placed on a single colony and allowed to feed for six minutes, removing ~ 20 % of the colony. Predation by the nudibranchs was mimicked by manually removing the equivalent amount of zooid pairs from equivalent regions. Treatments were applied on the 18 February 2000 and colonies repositioned within 12 hours 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. Plates were returned to the laboratory once a week for measurement.
Colony Establishment: 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, 1, 2, 3, 4 as weeks); Plate No (1, 2, 3, 4) Colony (1-15) ; Treatment (Nudibranch , Mock, Control); Branching score; Change in Branching Score; Proportion of colonies reproductive; Ovicells per branching score.
NB. Branching score represents the number of times a branching event had taken place and provides an index of colony size.
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 are for an individual colony
c. Media Types: Not Relevant
d. Date: February 2000
e. Dates of various parts of the process: Treatments imposed 18 February 2000
2. Processing Steps
a. Intermediate processing steps (after data capture): Not Relevant
b. Methods used to generate final product: Not Relevant
a. Dataset: This dataset gives i) branching score; ii) change in branching score; iii) proportion of colonies reproductive and iv) number of ovicells per branching score for Buluga neritina colonies at weekly intervals for four weeks following three predation treatments: no predation (control); ii) predation by the nudibranch Polycera hedgepethi and iii) mock nudibranch predation. Sixty colonies were established from larvae settled onto four PCV plates, with 15 colonies on each plate (see below). Each of the three treatments was applied to five colonies on each of the four plates, so that in total each treatment was replicated 20 times. At the time of treatment colonies were immature and on average had undergone six branching events. A nudibranch that had been starved for 24 hours was placed on a single colony and allowed to feed for six minutes, removing ~ 20 % of the colony. Predation by the nudibranchs was mimicked by manually removing the equivalent amount of zooid pairs from equivalent regions. Treatments were applied on the 18 February 2000 and colonies repositioned within 12 hours 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. Plates were returned to the laboratory once a week for measurement.
Colony Establishment: 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, 1, 2, 3, 4 as weeks); Plate No (1, 2, 3, 4) Colony (1-15) ; Treatment (Nudibranch , Mock, Control); Branching score; Change in Branching Score; Proportion of colonies reproductive; Ovicells per branching score.
NB. Branching score represents the number of times a branching event had taken place and provides an index of colony size.
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 are for an individual colony
c. Media Types: Not Relevant
d. Date: February 2000
e. Dates of various parts of the process: Treatments imposed 18 February 2000
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: 2000-02-18 to 2000-03-18
text: westlimit=144.91414; southlimit=-37.86347; eastlimit=144.91414; northlimit=-37.86347
text: uplimit=100; downlimit=2
Subjects
20 000000 |
20 331013 |
24 424002 |
AQUATIC ECOSYSTEMS |
Benthic Habitat |
BIOSPHERE |
Biosphere | Ecological Dynamics | Adaptation |
Biosphere | Zoology | Invertebrates |
Bryozoa |
Bugula neritina |
Civil Disturbance |
EARTH SCIENCE |
ECOLOGICAL DYNAMICS |
ENVIRONMENTAL IMPACTS |
HUMAN DIMENSIONS |
Oceans | Marine Biology | Marine Invertebrates |
Population Dynamics |
Polycera hedgpethi |
SPECIES/POPULATION INTERACTIONS |
biota |
colony damage |
disturbance |
modular organisms |
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Identifiers
- global : 61ef6ed0-0e56-11dc-8c12-00188b4c0af8