Data/hora: 10/06/2024 08:27:46

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 22/09/2008
Data da última atualização: | 22/09/2008
Autoria: | BUTT, K. R.; BRIONES, M. J. I.; LOWE, C. N.
Título: | Fate of visual implant elastomer in tagged earthworms.
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:

Visual Implant Elstomer (VIE) tags, designed for marking fish, have been recently appplied to
earthworms. For example, Gonzalez et al (2006) used this technique and showed that in forest
and pasture soils, tags injected into Pontoscolex corethrus housed in PVC tubes could be located
after a period of 4 months. Laboratory studies with a number of temperate earthworm species
(Butt and Lowe, 2007) showed that the biologically-compatible polymer tags remained in the
animal and could be visually located after a period in excess of 12 months. Tagging was also
shown not to affect growth to maturity, mating or cocoon production of Lumbricus terrestris.
Therefore, this technique offers opportunities for mark, release and recapture studies plus more
general earthworm longevity records under a variety of field and laboratory conditions. Published
data has suggested the tags may not remain in one piece and may move within the earthworm
body over time, migrating towards the posterior end of the animal. The work described here
sought to establish exactly where the VIE material was positioned within an earthworm after
tagging and how aspects of this material might change with time. To this end, L. terrestris,
Octolasion cyaneum, O. lacteum, Aporrectodea caliginosa and Allolobophora chlorotica were
tagged posterior to the clitellum, maintained in laboratory culture conditions. Then after various
periods of time (2 days, 1 week, 1 month, 1 year and 2 years), earthworms were preserved and
dissected, so that location and changes in the appearance of the VIE material could be recorded.
Results showed that, although there were differences between species, over time the tag material
tended to become enveloped by the chloragogenous tissue, septa and nephridia. After injection
and in the longer term (e.g. after two years), the thickness of this layer (surrounding the tag)
made tag location more difficult. This problem became more acute when the material was injected/
settled as small droplets in the post-clitellar region. It is suggested that for reliable tagging, a
reasonably large amount of VIE material needs to be precisely injected into segments anterior
to or close behind the clitellum. It is also concluded that further research is needed to determine
the maximum period of time this tagged material can be observed in different species.

Categoria do assunto: | --
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (43660-1) - UPE - PL - -- - CD0305 -  -  - DIS