Meiofauna associated with mangroves in the Hunter River estuary and Fullerton Cove, south-eastern Australia

1985 ◽  
Vol 36 (1) ◽  
pp. 41 ◽  
Author(s):  
M Hodda ◽  
WL Nicholas
Keyword(s):  
Relative Abundance ◽  
River Estuary ◽  
Species Distributions ◽  
Total Density ◽  
Nematode Density ◽  
South Eastern ◽  
Algal Food ◽  
Factors Influencing ◽  
Eastern Australia ◽  
South Eastern Australia

The meiofauna from 14 sampling sites around the Hunter River estuary is described, and the factors influencing total density and relative abundance of nematodes and copepods and some species distributions are discussed. Elevation above low tide mark influenced nematode density, and salinity influenced copepod density and relative abundance. Both nematodes and copepods were most dense near the mud surface, and algal food and the depth of the reducing layer appear to be partially responsible for major differences in the density of these two taxa at different sites. Pollution also influenced the total density of both nematodes and copepods and also the relative abundance of oligochaetes: these relationships are discussed in the light of other, contradictory, reports.

Modelling the factors influencing Sambar Deer (Rusa unicolor) occurrence in the wet eucalypt forests of south-eastern Australia

2020 ◽  
Author(s):  
S. Sotorra ◽  
D. Blair ◽  
W. Blanchard ◽  
D. Lindenmayer
Keyword(s):  
National Parks ◽  
Negative Binomial ◽  
Negative Binomial Regression ◽  
South Eastern ◽  
Factors Influencing ◽  
Eastern Australia ◽  
Mountain Ash ◽  
Sambar Deer ◽  
Central Highlands ◽  
South Eastern Australia

Many invasive species have had negative effects on the Australian environment, including the introduced Sambar Deer (Rusa unicolor). However, there is a paucity of information on the factors influencing the fine scale distribution and abundance patterns of Sambar Deer in south-eastern Australia. We present the results of a field survey of Sambar Deer in the Critically Endangered Mountain Ash ( Eucalyptus regnans) forests of the Central Highlands, Victoria. Our key question was: What factors influence detections of Sambar deer (based on scat counts) within the Mountain Ash forests of the Victorian Central Highlands? We surveyed 86 long-term field sites and detected a total of 245 groups of Sambar Deer pellets on 42% of these sites. Negative binomial regression modelling identified three factors associated with the occurrence of deer pellets. We recorded more pellets: (1) in 30 and 80 year old forest that remained unburned in fires that occurred in 2009, (2) on sites within closed National Parks relative to sites in State Forest, and (3) close to streams.

scholarly journals In data-limited situations, stakeholder advice can help shore-up your conservation solutions

2018 ◽  
Author(s):  
OCTO
Keyword(s):  
Species Distributions ◽  
South Eastern ◽  
Marine Park ◽  
Eastern Australia ◽  
Conservation Actions ◽  
Marine Flora ◽  
Environmental Proxies ◽  
South Eastern Australia

In areas without robust surveys of species distributions, proxies are often used to estimate where marine flora and fauna reside. The authors tested a number of environmental proxies to see how well they could be used to predict both the distribution and abundance of species, using the Solitary Islands Marine Park in south-eastern Australia as a case study. Merging the outputs from both species- and habitat-oriented models with stakeholder advice is likely the best bet for planning conservation actions in data-limited situations.

scholarly journals Recolonisation of rabbit warrens following coordinated ripping programs in Victoria, south-eastern Australia

2014 ◽  
Vol 41 (1) ◽  
pp. 46 ◽  
Author(s):  
D. S. L. Ramsey ◽  
S. R. McPhee ◽  
D. M. Forsyth ◽  
I. G. Stuart ◽  
M. P. Scroggie ◽  
...  
Keyword(s):  
Monitoring Program ◽  
Source Population ◽  
South Eastern ◽  
Factors Influencing ◽  
Adaptive Monitoring ◽  
Eastern Australia ◽  
Using Data ◽  
South Eastern Australia

Context Warren ripping has been demonstrated to be an effective tool for controlling rabbit populations. However, few studies have examined factors influencing the rate at which ripped warrens are likely to be recolonised (i.e. be re-opened). Aims To examine factors influencing the recolonisation of ripped warrens by rabbits by using data collected on 555 warrens for up to 15 years following coordinated ripping programs at 12 sites in Victoria, south-eastern Australia. Methods Warren-monitoring data (number of active and inactive warren entrances) were analysed using discrete-time survival analysis to determine the effects of warren-level and site-level covariates on the recolonisation of ripped warrens. Key results Warren recolonisation was related to the distance between the ripped warren and the nearest active warren, the number of active entrances in the nearest warren, the initial number of active entrances in the ripped warren and the rabbit spotlight abundance index at the site. The probability of warren recolonisation was highest for ripped warrens within 1 km of an active warren and negligible beyond 3 km. The probability of warren recolonisation also increased by 22% for every increase in the rabbit spotlight count at the site by 10 rabbits km–1. Conclusions The recolonisation of ripped warrens was highly influenced by both the distance to, and size of, neighbouring active warrens. Larger warrens also appear to be preferentially recolonised compared with smaller warrens, suggesting that recolonisation of ripped areas may be related to habitat quality. The present results are consistent with ideas from classical metapopulation theory predicting that the rates of colonisation of vacant patches are dependent on both the proximity and size of the source population as well as the quality of habitat patches. Implications Although coordinated warren ripping programs are effective at achieving long-term control of rabbits, their efficiency at maintaining low rabbit populations can be increased by adopting an adaptive monitoring program that incorporates warren size and the spatial relationships among warrens, and using this information to better target maintenance-control activities.

Distribution and growth of juvenile mulloway, Argyrosomus hololepidotus (Pisces: Sciaenidae), in the Hawkesbury River, south-eastern Australia

1993 ◽  
Vol 44 (3) ◽  
pp. 401 ◽  
Author(s):  
CA Gray ◽  
VC McDonall
Keyword(s):  
Fresh Water ◽  
Relative Abundance ◽  
Salinity Gradient ◽  
Late Summer ◽  
River Otter ◽  
South Eastern ◽  
Total Length ◽  
Eastern Australia ◽  
South Eastern Australia

The distribution, recruitment, relative abundance and growth of juvenile mulloway, Argyrosomus hololepidotus Lacepede, was investigated in the Hawkesbury River. Otter trawling was used monthly between July 1986 and March 1988 at 12 sites along a salinity gradient over 85 km of the estuary. The greatest numbers of juveniles were caught at sites in the mid section of the estuary (20-40 km from the mouth) where salinities were greatly reduced. No A. hololepidotus were caught at sites that were permanently fresh water and few were caught at the marine-dominated sites closest to the mouth of the estuary. The greatest numbers of juveniles were caught between March and September (autumn-winter) and the fewest between October and January (spring-summer). Juveniles with an estimated age of 2-6 months were caught between February and July (late summer-winter) each year at a size of 30-150 mm total length. Juveniles increased in length by 80-100 mm between March and October.

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