Bibliografie tematiche / Mangrove ecology South Australia St. Vincent Gulf

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Letteratura scientifica selezionata sul tema "Mangrove ecology South Australia St. Vincent Gulf"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 19 febbraio 2022

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Articoli di riviste sul tema "Mangrove ecology South Australia St. Vincent Gulf"

Butler, A. J. "Recruitment of sessile invertebrates at five sites in Gulf St. Vincent, South Australia". Journal of Experimental Marine Biology and Ecology 97, n. 1 (giugno 1986): 13–36. http://dx.doi.org/10.1016/0022-0981(86)90065-1.

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Triantafillos, Lianos, Stephen Donnellan e Alan J. Butler. "Population genetic structure of the muricid gastropodLepsiella vinosain Gulf St Vincent, South Australia". Molluscan Research 19, n. 2 (gennaio 1998): 31–42. http://dx.doi.org/10.1080/13235818.1998.10673716.

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Butler, A. J. "Effect of patchsize on communities of sessile invertebrates in Gulf St Vincent, South Australia". Journal of Experimental Marine Biology and Ecology 153, n. 2 (novembre 1991): 255–80. http://dx.doi.org/10.1016/0022-0981(91)90229-p.

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Tanner, Jason E. "The influence of prawn trawling on sessile benthic assemblages in Gulf St. Vincent, South Australia". Canadian Journal of Fisheries and Aquatic Sciences 60, n. 5 (1 maggio 2003): 517–26. http://dx.doi.org/10.1139/f03-044.

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Most experimental studies on the effects of trawling on the benthos use remote sampling techniques and are conducted in recently trawled areas. Thus it is difficult to determine the effects of trawling on previously unfished areas, and the fates of individual animals cannot be followed. In this study, I follow the fates of individuals of several sessile taxa when exposed to experimental trawling in areas that have not been trawled for some 1520 years. Although there was a significant trawling by location effect for all multivariate analyses and most individual taxa, I found that trawling had an overall negative effect on the benthos. Epifauna at trawled sites decreased in abundance by 28% within 2 weeks of trawling and by another 8% in the following 23 months (compared with control sites). Seasonal seagrasses were also less likely to colonise trawled sites than untrawled sites. The persistence of most taxa declined significantly in trawled areas compared with untrawled areas. In contrast to this, the recruitment rates of several taxa into visible size classes increased after trawling, presumably because of a reduction in competition.

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Bryars, Simon R., e Mark Adams. "An allozyme study of the blue swimmer crab, Portunus pelagicus (Crustacea : Portunidae), in Australia: stock delineation in southern Australia and evidence for a cryptic species in northern waters". Marine and Freshwater Research 50, n. 1 (1999): 15. http://dx.doi.org/10.1071/mf98075.

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Allozyme analysis was used to examine the species-level systematics and stock structure of the Australian blue swimmer crab Portunus pelagicus. Fifty-seven crabs from eight sites were screened in an overview study for allozyme variation at 35 loci. This overview study revealed the presence of two species, differing at a Nei D of 0.14 (2% fixed differences), in the Darwin region of northern Australia. One of these species corresponds to the common P. pelagicus found throughout Australia, whereas the other is most likely either an undescribed ‘cryptic’ species, or the east-Asian species P. trituberculatus. In total, 609 P. pelagicus from 11 sites covering three regions in South Australia and two regions in the Northern Territory were then genotyped at seven polymorphic loci and these data assessed, using goodness- of-fit and F-statistics, for the existence of subpopulations. Four discrete subpopulations could be discerned, namely West Coast, Spencer Gulf, and Gulf St Vincent in South Australia, and Darwin–Gove in the Northern Territory. No evidence of population substructuring among sites within each subpopulation was evident from the allozyme data. The results support the current recognition of the three South Australian regions as separate stocks, and suggest that a taxonomic revision of Indo-Pacific Portunus is warranted.

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Cann, John H., Colin V. Murray-Wallace, Naomi J. Riggs e Antonio P. Belperio. "Successive foraminiferal faunas and inferred palaeoenvironments associated with the postglacial (Holocene) marine transgression, Gulf St Vincent, South Australia". Holocene 16, n. 2 (febbraio 2006): 224–34. http://dx.doi.org/10.1191/0959683606hl907rp.

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Kangas, M. I., e W. B. Jackson. "Sampling juvenile Penaeus latisulcatus Kishinouye with a water-jet net compared with a beam-trawl: spatial and temporal variation and nursery areas in Gulf St Vincent, South Australia". Marine and Freshwater Research 49, n. 6 (1998): 517. http://dx.doi.org/10.1071/mf98038.

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This study demonstrates that the water-jet net is more effective than a beam trawl in capturing juvenile Penaeus latisulcatus. In contrast with the beam trawl, which is maximally effective only at night when prawns are active, the jet net captures high numbers of prawns in daylight. This, combined with its ability to minimize catchability effects, makes the jet net very suitable for sampling juvenile P. latisulcatus. For sampling prawns of widely varying size, perpendicular trawls were more effective than parallel trawls because larger individuals are distributed in deeper waters. Nursery areas for P. latisulcatus are intertidal sand/mudflats and there is little daily variation of prawn abundance and distribution within one site. Large differences in abundance of juvenile prawns were observed throughout Gulf St Vincent with highest concentrations in the northern part of the gulf.

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Fowler, A. J., G. K. Jones e R. McGarvey. "Characteristics and consequences of movement patterns of King George whiting (Perciformes : Sillaginodes punctata) in South Australia". Marine and Freshwater Research 53, n. 7 (2002): 1055. http://dx.doi.org/10.1071/mf02023.

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The characteristics of movement of the South Australian population of King George whiting (Sillaginodes punctata) were determined through analysis of tag and recapture records collected from three tagging periods: (i) 1968–1969; (ii) 1978–1985; and (iii) 1986–1987. The characteristics were compared between the northern and southern parts of two large fishery regions, and determined for fish tagged at different sizes and ages. Fish tagged in the northern Gulf St Vincent and Spencer Gulf moved southwards up to several hundred kilometres, but those tagged in the southern areas showed no systematic directional displacement. Most fish tagged were subadults or young, immature adults at 2–4 years of age. Small, young fish did not move far until a considerable period after tagging, whereas some fish >300 mm total length (TL) at tagging moved substantial distances within only a few weeks. Fish movement resulted in a significant ontogenetic habitat shift, from relatively protected shallow waters that support extensive meadows of seagrass, to southern, exposed, deeper waters and rocky reef. As a result of this systematic, directional displacement the age structures of the fishery catches also varied systematically throughout the two regions. In the northern areas these were simple and dominated by the 3+ age class, whereas in the south they were complex and consisted of the 2+ to 17+ age classes. Because the latter were the spawning populations, fish movement is an obligate step in the life history that ultimately results in supplementation of numbers on the spawning grounds. The consequences for fishery management are discussed.

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Butler, AJ. "Ecology of Pinna bicolor gmelin (Mollusca : Bivalvia) in Gulf St Vincent, South Australia: density, reproductive cycle, recruitment, growth and mortality at three sites". Marine and Freshwater Research 38, n. 6 (1987): 743. http://dx.doi.org/10.1071/mf9870743.

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Random samples of P. bicolor were taken from one intertidal and two subtidal sites over 3 years and tagged individuals of P. bicolor were followed for up to 6 years at two other sites. P. bicolor is dioecious. Mature gonads were observed in early summer (November-January) with a peak in December each year. The pattern appeared to differ little between years or sites but the period of maximum gonad activity was shorter at the intertidal site. Growth was slower at the intertidal site and animals reached a smaller maximum size there than at the subtidal sites, which differed slightly. It is concluded that P. bicolor can reach reproductive size (15 cm shell length) in little more than a year but, at least subtidally, have a low mortality rate (less than 0.1 year-1) thereafter. Recruitment is variable and it is argued that at some sites superficially 'stable' densities of P. bicolor are maintained by occasional strong recruitments, which are 'stored' in the population because of low adult mortality. The implications of this for management and for the use of P. bicolor as a biological monitor are discussed.

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Styan, C. A., e A. J. Butler. "Asynchronous patterns of reproduction for the sympatric scallops Chlamys bifrons and Chlamys asperrima (Bivalvia: Pectinidae) in South Australia". Marine and Freshwater Research 54, n. 1 (2003): 77. http://dx.doi.org/10.1071/mf02019.

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Abstract (sommario):

Patterns of spawning activity were assessed by monitoring gonad states over 2.5 years for Chlamys asperrima and Chlamys bifrons at two sites in Gulf St Vincent, South Australia. Chlamys asperrima appeared to have a minor spawning in June, followed by a major spawning starting in late August. In contrast, the gonads of C. bifrons were regressed only during winter and it appeared that C. bifrons spawned for a long period, from late spring (September) until early autumn (March). At one site where sampling was frequent, there was evidence of three series of C. bifrons spawning events during the summer of 1994/95 and at least two series of events during 1995/96. Build-up and decrease in gonad weight was quick, but there was strong evidence of serial spawning for both species. Subsequently, we once observed C. asperrima spawning in situ at Edithburgh Jetty, at a time when gonad weights had been decreasing in previous years, but also long after the time when peak gonad weights had usually occurred. Only patches within the population were seen spawning, with scallops not spawning observed less than 100 m away from those that were. Indirect sampling of gonad condition also suggested that spawning in C. bifrons at Largs Bay was not always synchronous among patches of scallops within a population, nor always between sexes within patches.

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