Biodiversity and Biogeography of the Kuril Islands and Sakhalin (2009) 3,1-34.
Geographical Distribution Patterns of the Apiaceae in
Sakhalin and the Kurillslands
Hideki Takahashi
The Hokkaido University Museum, Sapporo 060-0810, Japan
E-mail:
[email protected]
Abstract Thirty species of the Apiaceae in Sakhalin (S) and the Kuril Islands (K)
were
examined on 1,592 specimens deposited in the main Japanese herbaria: KYO,
SAPS, SAPT, TI and TNS. The geographical distribution
of 27 of these 30 species was
determined quantitatively. Ligusticum scoticum (number
of specimens: S+K = 190) and
Tilingia ajanensis (S+K
= 171) represent the two most abundant species of the Apiaceae in
these regions. The Sakhalin-Kurils index (S-K index:
S-K/S+K) of L. scoticum showed a
somewhat negative numerical value, -0.11, and that
of T. ajanensis showed an especially
negative value,
-0.43, meaning a clear distribution bias of the latter species toward the
Kurils. However, many Apiaceae species are characterized by positive S-K indices, which
means generally a distribution bias toward Sakhalin. An extreme high positive S-K index
(+ 1.00), which means the presence in Sakhalin but the absence in the Kurils, is found in the
following six species: Angelica edulis (but only S+K
= 1), A. maximowiczii, A. saxatilis,
A. ursina (but actually present in Kunashir), Phlojodicarpus
viZZosus and SphaZZerocarpus
gracilis. An extreme high negative S-K index
(-1.00) is found in only one species,
Conioselinum filicinum.
Kew words: Apiaceae, geographical distribution, Kurils, Sakhalin, S-K index
Introduction
The distribution patterns of gymnosperms
(Takahashi 2004) and Ericaceae (Takahashi 2006)
in Sakhalin and the Kuril Islands have been reported
previously, and the Sakhalin-Kurils index (S-K
index) proved to be a convenient way of showing the
quantitative distribution patterns.
Following these
earlier reports, geographical distribution patterns
of
the Apiaceae are considered in this study. The plants
of Apiaceae grow in a wide variety of habitats: coastal
meadows and rocks, wet places along streams and
valleys, forests to forest-edges in lowland to mountain
regions, and alpine meadows. This family is regarded
as one of the important main components of the boreal
native flora and vegetation
of the regions in question.
Determining the extant distribution patterns of the
Apiaceae in Sakhalin and the Kurils will contribute to
the study on the past changes
of flora and vegetation in
Northeast Eurasia.
Materials and Methods
Thirty species of the Apiaceae have been recorded
from Sakhalin and the Kurils. Specimens collected
from the regions were examined in the main Japanese
herbaria: KYO, SAPS, SAPT, TI and TNS (acronyms
following
Holmgren et al. 1990, except for SAPT,
which means the Herbarium
of the Botanic Garden,
Hokkaido University). As the presence of three
species, Hydrocotyle ramiflora, Seseli condensatum and
Torilis japonica, was not ascertained from the regions,
the distribution patterns
of the remaining 27 species
were analyzed quantitatively. Specimens examined are
listed in the Appendix. Geographical grids or island
numbers used in the Appendix are shown in the maps
of Sakhalin (Fig. 1) and the Kurils (Fig. 2).
The number
of herbarium specimens excluding
duplicate sheets are counted for Sakhalin (S) and the
Kurils (K), and also counted for three parts
of each
region (Table
1). The S-K index is formulated as S-KI
S+K. The numerical value of this index varies between
-1.0 and + 1.0; a higher positive number indicates more
abundant distribution in Sakhalin than in the Kurils,
and vice versa (Table 2).
Since this study aims mainly to determine
quantitatively the geographical distribution patterns
of the Apiaceae species in these regions, only
representative synonyms and recent literatures are cited
in the Results and Discussion.