e-journal

Transgressive aggression in Sceloporus hybrids confers fitness through advantages in male agonistic encounters

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Summary
1. We investigated agonistic behaviour and associated characteristics of Sceloporus woodi (Florida
scrub lizard), Sceloporus undulatus (Eastern fence lizard) and their hybrids using staged territorial
encounters.
2. These Sceloporus hybrids exhibit transgressive aggression and transgressive head-girth relative
to the parental species and the transgressive aggression was specifically associated with an advantage
in agonistic encounters. Our results suggest a hybrid advantage in natural habitats when
defending and invading territories against either parental species.
3. We further analysed general advantages in agonistic encounters across the entire three-group
system to elucidate characteristics that may be advantageous under specific circumstances. Individuals
with larger body size (SVL) and greater aggression had an overall advantage in agonistic
encounters; however, smaller individuals could win when slightly more aggressive and fatter, and
less aggressive individuals could win when slightly larger, especially with greater head-girth.
4. The extreme hybrid phenotypes likely occurred through transgressive segregation, which has
been implicated as a process through which homoploid, hybrid speciation can occur. Some formof
ecological divergence is necessary, however, to impede parental gene flow. Our data suggest that
ecological divergence could manifest in territorial species through transgressive aggression.

Key-words: ecological isolation, extreme phenotype, homoploid hybrid speciation, hybrid
vigour, squamates

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Ketersediaan

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Informasi Detail

Judul Seri

Journal of Animal Ecology

No. Panggil

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Penerbit

London : British Ecological Society., 2010

Deskripsi Fisik

Journal of Animal Ecology 2010, 79, 137–147

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

BIOLOGI

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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