Data/hora: 23/09/2024 20:15:16

Biblioteca(s): 	Embrapa Florestas.	
Data corrente: 	23/09/2008	
Data da última atualização: 	23/09/2008	
Autoria: 	LOWE, C. N.; BUTT, K. R.	
Título: 	Allolobohora chlorotica (Savigny, 1826): Further evidence for consideration as two separate species.	
Ano de publicação: 	2008	
Fonte/Imprenta: 	In: INTERNATIONAL COLLOQUIUM ON SOIL ZOOLOGY, 15; INTERNATIONAL COLLOQUIUM ON APTERYGOTA, 12., 2008, Curitiba. Biodiversity, conservation and sustainabele management of soil animal: abstracts. Colombo: Embrapa Florestas. Editors: George Gardner Brown; Klaus Dieter Sautter; Renato Marques; Amarildo Pasini. 1 CD-ROM.	
Idioma: 	Inglês	
Conteúdo: 	The temperate earthworm species Allolobophora chlorotica exists as two colour morphs; green
(g) and pink (p). Breeding experiments (Satchell, 1967; Lowe and Butt, in press) have questioned
the status of these two morphs. Should they become regarded as separate species, the name
Allolobophora virescens (Savigny, 1826) is available for the pink form of this earthworm. Further
breeding experiments were established to investigate the status of this species utilising previously
unmated laboratory-reared adults. Pairs were set up for 10 days to facilitate mating, separated
and then maintained in isolation for 28 days to obtain individual reproduction results. Cocoon
production and viability were first determined from intra-morphic (p x p and g x g) and intermorphic
(p x g) pairings. All p x p and g x g pairings bred true with mean cocoon production in
g x g (4.6 cocoons / worm / 28 days) significantly greater (P<0.05) than in p x p (3.2 cocoons /
worm / 28 days). In p x g pairings, both pink and green individuals produced cocoons (3.9 and
5.9 cocoons / worm / 28 days respectively). However here, viability of cocoons produced by g
was very low at 6 %, compared with 59 % for p. In a second experiment, previously unmated
offspring from inter-morphic pairings (pg) were paired with like individuals (pg x pg) and also
paired with with pure bred pink (p) and green (g) individuals (p x pg and g x pg respectively). All
crosses produced cocoons. All cocoons produced by pg x pg crosses were inviable. In p x pg
and g x pg crosses the pg parent produced viable cocoons (64 and 79% viability respectively)
but cocoons produced by p and by g parents from these matings were 100% inviable. It is
suggested that severely restricted viability of cocoons produced by the green morph in p x g
pairings provides evidence for genetic divergence of the 2 morphs. Furthermore, backcrossing
of hybrids (pg) with pure bred morphs has indicated that hybrids are male sterile confirming one
of the hypotheses proposed by Satchell (1967). These results, albeit with single populations of
both morphs, provides evidence for the re-classification of the pink morph as Allolobophora
virescens.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Florestas (CNPF)	
Exemplares: 	CNPF - (43670-1) - UPE - PL - -- - CD0305 -  -  - DIS