Szczegóły

Tytuł artykułu

Discovery of Swimming Males of Paratanaoidea (Tanaidacea)

Tytuł czasopisma

Polish Polar Research

Rocznik

2014

Numer

No 2

Autorzy publikacji

Słowa kluczowe

Icelandic waters ; IceAGE ; Crustacea ; sexual dimorphism ; biodiversity ; barcoding

Wydział PAN

Nauki o Ziemi

Zakres

415-453

Abstrakt

In Tanaidacea morphological identification of male individuals to the species level is complicated by two factors: the presence of multiple male stages/instars confuse the assessment of sexual stage while strong sexual dimorphism within several families obscures the morphological affinities of undescribed males to described females. Males of Paratanaoidea are often morphologically quite different from females and have not been discovered for most genera so far, which has led to the assumption that some tanaidaceans might have parthenogenetic reproduction or simply have undeveloped secondary sex traits. As a part of the IceAGE project (Icelandic marine Animals: Genetics and Ecology), with the support of molecular methods, the first evidence for the existence of highly dimorphic (swimming) males in four families of the superfamily Paratanaoidea (Agathotanaidae, Cryptocopidae, Akanthophoreidae, and Typhlotanaidae) is presented. This study suggests that these males might be the next instars after juvenile or preparatory males, which are morphologically similar to females. It has been assumed that “juvenile” males with a restricted ability for swimming ( e.g. , undeveloped pleopods) have matured testes, are capable of reproduction, and mate with females nearby, while swimming males can mate with distant females. Our explanation of the dimorphism in Tanaidomorpha lies in the fact that males of some species ( e.g. , Nototanais ) retain the same lifestyle or niche as the females, so secondary traits improve their ability to guard females and successfully mate. Males of other species that have moved into a regime (niche) different than that of the female have acquired complex morphological changes ( e.g. , Typhlotanais ).

Wydawca

Committee on Polar Research ; Polish Academy of Sciences

Data

2014

Typ

Artykuły / Articles

Identyfikator

ISSN 0138-0338 ; eISSN 2081-8262

DOI

10.2478/popore−2014−0022

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