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Spatial patterns of genetic structure among populations of a stone‐cased caddis (Trichoptera: Tasimiidae) in south‐east Queensland, Australia
Author(s) -
SCHULTHEIS ALICIA S.,
HUGHES JANE M.
Publication year - 2005
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.2005.01444.x
Subject(s) - biological dispersal , gene flow , biology , ecology , genetic structure , geographical distance , range (aeronautics) , genetic distance , population , fecundity , spatial ecology , streams , zoology , genetic variation , gene , demography , genetics , computer network , materials science , sociology , computer science , composite material
Summary 1. Gene flow and dispersal among populations of a stone‐cased caddis (Tasimiidae: Tasimia palpata ) were estimated indirectly using a 460 bp region of the cytochrome oxidase I gene of mitochondrial DNA. 2. There was no significant differentiation at the largest spatial scale (between catchments) and no correlation between genetic distance and geographic distance. These results are consistent with widespread adult dispersal. 3. Conversely, significant genetic differentiation was detected at the smallest spatial scale examined (among reaches within streams). This pattern was primarily because of significant F ST values in a single stream (Bundaroo Creek). 4. Bundaroo Creek also had the lowest mean number of haplotypes per population ( n = 7) suggesting that a limited number of females may be responsible for recruitment at these sites. Significant F ST 's at the reach scale may be a result of this ‘patchy’ recruitment. However, additional evidence regarding the long‐range dispersal ability and fecundity of T. palpata females is needed to test this hypothesis fully.