INVESTIGADORES
SAHADE Ricardo Jose
artículos
Título:
Genetic differentiation between morphotypes in the Antarctic limpet Nacella concinna as revealed by inter-simple sequence repeat markers
Autor/es:
CARLA DE ARANZAMENDI; RICARDO SAHADE; MARCOS TATIÁN; MARINA CHIAPPERO
Revista:
MARINE BIOLOGY
Editorial:
Springer
Referencias:
Año: 2008
ISSN:
0025-3162
Resumen:
The limpet Nacella concinna (Strebel 1908)
was the focus of numerous studies dealing with Antarctic
benthos. One of the main characteristics of the species is the
presence of two distinguishable morphotypes, one inhabiting
the intertidal (during summer) and the other inhabiting
the subtidal. For a long time these forms were considered as
an expression of phenotypic plasticity, since previous
studies did not found genetic differences between them. In
the present work, we performed both a morphometric and a
genetic differentiation analysis (using ISSR-PCR markers)
of these two forms in three stations sampled at Potter Cove,
South Shetland Islands. The results confirmed the morphological
differences between intertidal and subtidal forms
reported in other Antarctic localities. The genetic differences
detected indicate that the two forms can be considered
as genetically distinct populations maintaining low levels of
gene flow. The degree of reproductive isolation of the
ecotypes is discussed, as well as the possible origin of the
divergence. The genetic differentiation observed can also
have behavioral and physiological correlates, pointing out
the importance of taking into account the potential differences
in the response of both populations to different
conditions in future studies in this species.
was the focus of numerous studies dealing with Antarctic
benthos. One of the main characteristics of the species is the
presence of two distinguishable morphotypes, one inhabiting
the intertidal (during summer) and the other inhabiting
the subtidal. For a long time these forms were considered as
an expression of phenotypic plasticity, since previous
studies did not found genetic differences between them. In
the present work, we performed both a morphometric and a
genetic differentiation analysis (using ISSR-PCR markers)
of these two forms in three stations sampled at Potter Cove,
South Shetland Islands. The results confirmed the morphological
differences between intertidal and subtidal forms
reported in other Antarctic localities. The genetic differences
detected indicate that the two forms can be considered
as genetically distinct populations maintaining low levels of
gene flow. The degree of reproductive isolation of the
ecotypes is discussed, as well as the possible origin of the
divergence. The genetic differentiation observed can also
have behavioral and physiological correlates, pointing out
the importance of taking into account the potential differences
in the response of both populations to different
conditions in future studies in this species.
was the focus of numerous studies dealing with Antarctic
benthos. One of the main characteristics of the species is the
presence of two distinguishable morphotypes, one inhabiting
the intertidal (during summer) and the other inhabiting
the subtidal. For a long time these forms were considered as
an expression of phenotypic plasticity, since previous
studies did not found genetic differences between them. In
the present work, we performed both a morphometric and a
genetic differentiation analysis (using ISSR-PCR markers)
of these two forms in three stations sampled at Potter Cove,
South Shetland Islands. The results confirmed the morphological
differences between intertidal and subtidal forms
reported in other Antarctic localities. The genetic differences
detected indicate that the two forms can be considered
as genetically distinct populations maintaining low levels of
gene flow. The degree of reproductive isolation of the
ecotypes is discussed, as well as the possible origin of the
divergence. The genetic differentiation observed can also
have behavioral and physiological correlates, pointing out
the importance of taking into account the potential differences
in the response of both populations to different
conditions in future studies in this species.
Nacella concinna (Strebel 1908)
was the focus of numerous studies dealing with Antarctic
benthos. One of the main characteristics of the species is the
presence of two distinguishable morphotypes, one inhabiting
the intertidal (during summer) and the other inhabiting
the subtidal. For a long time these forms were considered as
an expression of phenotypic plasticity, since previous
studies did not found genetic differences between them. In
the present work, we performed both a morphometric and a
genetic differentiation analysis (using ISSR-PCR markers)
of these two forms in three stations sampled at Potter Cove,
South Shetland Islands. The results confirmed the morphological
differences between intertidal and subtidal forms
reported in other Antarctic localities. The genetic differences
detected indicate that the two forms can be considered
as genetically distinct populations maintaining low levels of
gene flow. The degree of reproductive isolation of the
ecotypes is discussed, as well as the possible origin of the
divergence. The genetic differentiation observed can also
have behavioral and physiological correlates, pointing out
the importance of taking into account the potential differences
in the response of both populations to different
conditions in future studies in this species.