Reproductive phenology in Dendrocoelum lacteum (Turbellaria) in South Sweden

Autor:	Jan Herrmann
Rok vydání:	1985
Předmět:	Hatching Phenology Ecology Environmental factor medicine Zoology Dendrocoelum lacteum Aquatic Science Biology medicine.disease_cause biology.organism_classification Turbellaria Hatchling
Zdroj:	Freshwater Biology. 15:127-132
ISSN:	1365-2427 0046-5070
Popis:	SUMMARY. 1 L 266 degree-days, above a threshold of 1.0°C, were required for cocoons from the triclad Dendrocoelum lacteum to hatch. The relation is described by ln D=6.12–1.17 1nr (D=number of days, T= temperature). 2 Laboratory and field cocoon deposition reached a maximum in late April; peaks of hatchling occurrence were 2 weeks later. The number of hatchlings per cocoon and eocoon viability declined as spring proceeded. Cocoon deposition ceased in June, coincident with regression of the reproductive organs of the adults. 3 Newly hatched triclads in the field are thought to avoid stones for their first weeks. 4 It is suggested that the earlier and more abundant offspring production in South Sweden than in Britain could be attributed to differences in spring temperature conditions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b1dcac3036d1d4c8b6c5f863491bcfc8 https://doi.org/10.1111/j.1365-2427.1985.tb00186.x Zobrazit plný text záznamu Plný text