Skip to content. | Skip to navigation

Personal tools

You are here: Home / Associated publications / Belgian Journal of Zoology / Bibliographic References / Further monthly records (1994 to 2000) of size and abundance in a population of the ``Australian'' flatworm, Australoplana sanguinea alba in the UK

HD Jones, J Green, K Harrison and DW Palin (2001)

Further monthly records (1994 to 2000) of size and abundance in a population of the ``Australian'' flatworm, Australoplana sanguinea alba in the UK

BELGIAN JOURNAL OF ZOOLOGY, 131(S1):217-220.

Collections of the ``Australian'' flatworm, Australoplana sanguinea alba, have been made in one garden in the UK three times a week from February 1995 to September 2000. All specimens seen were placed in 70\% alcohol, one jar each month. Flatworms were counted but not collected for some months from March 1992. The first flatworm was seen in December 1991. Rainfall, soil moisture and air and soil temperature (and latterly, the depth of the water table) were recorded. All specimens (5121) were weighed and measured. For some years the maturity of each specimen was also determined. Fewest flatworms are found in July and most in November. Seasonal variation is probably related to soil moisture content. Relatively low rainfall in the winter of 1995-6 apparently led to low numbers of flatworms the following winter. Average size of flatworms is smallest in July and largest in March. Apparent hatchlings are most abundant August to October. 80\% of the specimens were mature. Immature flatworms form the majority only between July and October. Specimens as small as 9.5 mm long are mature. Only four egg capsules have been seen over eight years. Flatworms have been observed undergoing fission and it is suspected that fission may be the main method of reproduction in this population. Body weight varies with the square of body length (exponent = 2.093).

Platyhelminthes; Tricladida; Australoplana sanguinea var. alba; Geoplana sanguinea; reproduction; growth; allometry
9th International Symposium on the Biology of the Turbellaria (ISBT), BARCELONA, SPAIN, JUN, 2000
BJZ

ISSN 2295-0451 (online version)
ISSN 0777-6279 (printed version)
impact factor 2015: 0,87.

Editor-in-Chief:
Prof. Dr. Isa Schön
Royal Belgian Institute of Natural Sciences
Vautierstraat 29
1000 Brussels, Belgium

 



1863-1903
Annales de la Société malacologique de Belgique
 
1903-1923
​Annales de la Société royale malacologique et zoologique de Belgique
 
1923-1989
Annales de la Société Royale Zoologique de Belgique
 
1989-
Belgian Journal of Zoology