Preliminary estimates of stocks of the king prawn, Penaeus plebejus, in south-east Queensland

1974 ◽  
Vol 25 (1) ◽  
pp. 35 ◽  
Author(s):  
C Lucas
Keyword(s):  
Population Estimates ◽  
Population Parameters ◽  
Offshore Area ◽  
Moreton Bay

Population estimates of the king prawn, Penaeus plebejus, in Moreton Bay and adjacent offshore areas are made from a study of commercial catches and by tag-recapture experiments. Juvenile prawns which are abundant in Moreton Bay during the summer months rapidly migrate to adjacent offshore areas and form the basis of an offshore fishery. Population parameters for Moreton Bay are F1 = 0.04, E1 = 0.17 and M1 ≤ 0.22 week-1. For the adjacent offshore area the parameters are F2 = 0.02, M2 = 0.05 week-1. These estimates indicate that of the order of 17% of the available stock is caught in Moreton Bay and that of the order of 26% of the available stock is caught in the offshore area off Mooloolaba. From a yield equation the response in catch to variations in fishing intensity is estimated.

Distribution and abundance of dugongs in Moreton Bay, Queensland, Australia

2003 ◽  
Vol 30 (4) ◽  
pp. 397 ◽  
Author(s):  
Janet M. Lanyon
Keyword(s):  
Hot Spots ◽  
Population Estimates ◽  
Correction Factors ◽  
Water Turbidity ◽  
Mean Intensity ◽  
Moreton Bay ◽  
Perception Bias ◽  
Species Specific ◽  
High Degree ◽  
Specific Correction

Dugong abundances in Moreton Bay (south-east Queensland) were estimated during six bi-monthly aerial surveys throughout 1995. Sampling intensity ranged between 20 and 80% for different sampling zones within the Bay, with a mean intensity of 40.5%. Population estimates for dugongs were corrected for perception bias (the proportion of animals visible in the transect that were missed by observers), and standardised for availability bias (the proportion of animals that were invisible due to water turbidity) with survey and species-specific correction factors. Population estimates for dugongs in Moreton Bay ranged from 503 ± 64 (s.e.) in July to 1019 ± 166 in January. The highest uncorrected count was 857 dugongs in December. This is greater than previous population estimates, suggesting that either previous surveys have underestimated abundance and/or that this population may have increased through recruitment, immigration, or a combination of both. The high degree of variation in population estimates between surveys may be due to temporal differences in distribution and herding behaviour. In winter, dugongs were found in smaller herds and were dispersed over a wider area than in summer. The Eastern Banks region of the bay supported 80–98% of the dugong population at any one time. Within this region, there were several dugong 'hot spots' that were visited repeatedly by large herds. These 'hot spots' contained seagrass communities that were dominated by species that dugongs prefer to eat. The waters of Rous Channel, South Passage and nearby oceanic waters are also frequently inhabited by dugongs in the winter months. Dugongs in other parts of Moreton Bay were at much lower densities than on the Eastern Banks.

Net migration estimates for Greece by age, sex and citizenship, 1991-2001

2008 ◽  
Vol 5 (2) ◽  
pp. 189-202
Author(s):  
Cleon Tsimbos
Keyword(s):  
Reproductive Age ◽  
Population Estimates ◽  
Demographic Analysis ◽  
Resident Population ◽  
Net Migration ◽  
Intercensal Period ◽  
Working Age ◽  
Official Data ◽  
Migration Component ◽  
Of Greece

This paper applies techniques of demographic analysis to official data of Greece to obtain net migration estimates by age, sex and citizenship for the intercensal period 1991-2001. It is found that the overall net immigration rate for the decade is 6.3 per 100 resident population and the contribution of foreign immigrants to this figure is 88.2 per cent. 85.4 % of the net immigrants are of working age and 70.3 % of net immigrant women are of reproductive age. The results of the study can be used to formulate assumptions regarding the migration component when handling population estimates and projections.

Source populations in coastal crabs: population parameters affecting egg production

2009 ◽  
Vol 7 ◽  
pp. 31-43 ◽  
Author(s):  
AAV Flores ◽  
CC Gomes ◽  
WF Villano
Keyword(s):  
Egg Production ◽  
Population Parameters ◽  
Source Populations

Estimating Population Parameters of the Cladocera

1998 ◽  
Vol 34 (4-5) ◽  
pp. 41-49
Author(s):  
V. I. Razlutskii
Keyword(s):  
Population Parameters

The Archaeology of the Peel Island Lazaret: Part 1: Survey

2002 ◽  
Vol 13 ◽  
pp. 31 ◽  
Author(s):  
Jonathan Prangnell
Keyword(s):  
Conservation Planning ◽  
Archaeological Survey ◽  
Landscape Modification ◽  
Moreton Bay ◽  
Nineteenth And Twentieth Centuries ◽  
Southeast Queensland

<p>An archaeological survey on Peel Island in Moreton Bay, southeast Queensland, was conducted to assist the conservation planning for the Peel Island Lazaret (PIL), one of a number of institutions housed on the island during the nineteenth and twentieth centuries. The survey revealed a patterning of artefacts across the island as well as landscape modification related to its Aboriginal and European institutional uses.</p>

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