Nesting behaviour of a temperate damselfish (Parma mccullochi) and its influence on algae
MetadataShow full item record
Many pomacentrid fishes spawn demersally, often onto nest sites of filamentous algae. The temperate Western Australian pomacentrid P. mccullochi spawns onto such nest sites. During preliminary observations nest sites with visibly different algal structures were observed, with the filamentous algal cover of some nests being greatly reduced compared to others. These observations led us to hypothesise that algal management by this species would lead to a large change in the algal structure of nest sites, through more intense disturbance processes than have been described in tropical herbivorous pomacentrids when maintaining their algal feeding areas. Behavioural observations and collection of algae from nest sites revealed that in late spring and summer P. mccullochi maintained and defended a nesting site that was populated by filamentous algae. Fish with nests defended the territory more intensively than fish without nests, at a cost of reduced feeding rates. The algae within the nest sites progressed through a series of three stages: prepared nests without eggs, nests with eggs and cropped nests. These three stages were characterised by variation in the biomass of red filamentous algae, which was highest on nests with eggs. The nest algae were severely cropped back after hatching and most of the biomass of red filamentous algae was removed. On this small spatial scale during late spring and summer, the effect of algal manipulation by this temperate pomacentrid inan algal canopy dominated reef system, is comparable to the strongest effects ofthe tropical pomacentrids that maintain species poor, high biomass feeding areasin coral reef systems.
Showing items related by title, author, creator and subject.
Saunders, Ben; Harvey, Euan; Kendrick, G. (2013)Many pomacentrid fishes spawn demersally, often onto nest sites of filamentous algae. The temperate Western Australian pomacentrid P. mccullochi spawns onto such nest sites. During preliminary observations nest sites with ...
Factors influencing distribution and habitat associations in an endemic group of temperate Western Australian reef fishes over a latitudinal gradientSaunders, Ben; Harvey, Euan; Kendrick, G. (2014)Similarities and differences in the density, distribution and habitat associations of 3 species from the pomacentrid genus Parma (Parma mccullochi, P. occidentalis, P. victoriae) were identified across 2000 km of temperate ...
Temperate territorial damselfish act like tropical damselfish, but have no measurable effect on algae within their feeding areasSaunders, Ben; Kendrick, G.; Harvey, Euan (2015)Areas of high habitat heterogeneity support a high diversity of fauna in both terrestrial and aquatic systems. In altering the rate of consumption of benthic communities, tropical damselfish affect the rate and trajectory ...