Edge effects on fish associated with seagrass and sand patches

Abstract

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 359:203-213 (2008) - DOI: https://doi.org/10.3354/meps07348 Edge effects on fish associated with seagrass and sand patches Timothy M. Smith1,2,*, Jeremy S. Hindell2,3, Gregory P. Jenkins2,3, Rod M. Connolly4 1Victorian Marine Science Consortium, PO Box 114, Queenscliff, Victoria 3225, Australia 2Department of Zoology, The University of Melbourne, Parkville, Victoria 3052, Australia 3Marine and Freshwater Systems, Department of Primary Industries Victoria, PO Box 114, Queenscliff, Victoria 3225, Australia 4Australian Rivers Institute—Coast and Estuaries, and Griffith School of Environment, Gold Coast Campus, Griffith University, Queensland 4222, Australia *Email: [e-mail] ABSTRACT: Seagrass beds form naturally patchy habitats with large areas of seagrass–sand interface, or edges. Fish were sampled at 3 sites in the temperate waters of Victoria, Australia, using small (0.5 m wide) push nets at 7 positions: unvegetated sand distant from the patch on the seaward side, the sand edge adjacent to the seagrass on the seaward side, the seagrass edge on the seaward side, the middle of the seagrass patch, the seagrass edge on the shore side of the patch, the sand adjacent to the seagrass on the shoreward side of the patch and unvegetated sand distant from the seagrass on the shoreward side. Samples were taken during the day and night, and seagrass variables were collected to describe structural complexity. As expected, more fish were caught in seagrass than over sand. Within seagrass, we found strong and consistent patterns at edges. Regardless of site, the total number of fish sampled was greater at the seaward seagrass edge (484 fish) than in the seagrass middle (231), but there was little difference between the seagrass middle and the shoreward seagrass edge (297). Two species of pipefish, Stigmatopora argus (193) and S. nigra (160), were much more abundant at the seaward seagrass edge than in the seagrass middle at all sites (54 and 46, respectively). The goby Nesogobius maccullochi showed a very different pattern. It was more abundant at the shoreward seagrass edge (127) than over the seagrass middle (31) at all sites, and tended to be more abundant over sand at the edge of seagrass patches than in any other sand positions. The weedfish Cristiceps australis was significantly more abundant at the seaward seagrass edge (26) than in the middle (11), but only at night. Consistent patterns in fish distributions demonstrate clear edge effects both within and alongside seagrass at these sites in south-eastern Australia. KEY WORDS: Seagrass · Fish · Edge effects · Diel cycles · Heterozostera nigricaulis · Unvegetated habitats · Seagrass structure Full text in pdf format PreviousNextCite this article as: Smith TM, Hindell JS, Jenkins GP, Connolly RM (2008) Edge effects on fish associated with seagrass and sand patches. Mar Ecol Prog Ser 359:203-213. https://doi.org/10.3354/meps07348 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 359. Online publication date: May 05, 2008 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2008 Inter-Research.