Wessel and Hoch (1999) Analysis of the Oliarus polyphemus species complex - Morphological, ethological and molecular approaches to study incipient speciation.

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Analysis of the Oliarus polyphemus species complex - Morphological, ethological and molecular approaches to study incipient speciation.

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CONTRIBUTORS:

	Author:	Wessel, Andreas (Humboldt Universität zu Berlin)
	Author:	Hoch, Hannelore

CONFERENCE TITLE:

10th International Auchenorrhyncha Congress (Cardiff, Wales)

CONF. LOCATION:

None

YEAR:

1999

PUB TYPE:

Conference Paper

SUBJECT(S):

incipient speciation

DISCIPLINE:

Entomology

HTTP:

http://www.agric.nsw.gov.au/Hort/ascu/tymbal/meetings.htm

LANGUAGE:

English

PUB ID:

103-397-640 (Last edited on 2003/12/05 08:55:45 US/Mountain)

SPONSOR(S):

ABSTRACT:
Among populations of Oliarus polyphemus FENNAH, a troglobitic species found in numerous lava tubes on Hawaii Island, a high degree of behavioural differentiation in the intraspecific communication signals has been observed (Hoch & Howarth 1993). Hoch & Howarth (1993) hypothesized that some of these populations were likely to represent species in statu nascendi or even reproductively isolated species.

A statistical species criterion was applied in recent studies on morphological and ethological character complexes of 10 populations of O. polyphemus (Wessel & Hoch 1999). As a result of these studies we hypothesize subspecies status for nine populations, one population is assigned specific rank. It was attempted to construct a phylogeny with the same morphological and ethological characters using PAUP.

On the molecular level mitochondrial sequences already successfully sequenced in other insect taxa were analysed in order to construct a molecular phylogeny. As the age of the Hawaiian caves is well known, it was tried to adjust the molecular clock for this model system. In addition, the period gene known from Drosophila was studied. The period gene is the only gene known to influence complex behavioural patterns in insects (circadian rhythms and song patterns). Thus, in addition to using the sequences for building an alternative molecular phylogeny, insights into the evolution and constraints on song development on the molecular level should be gained.

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