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We studied spatiotemporal variation in the spawning patterns of a local population of the brackish water clam Corbicula japonica in Lake Abashiri and the Abashiri River, over the entire range of this species in this basin. Reproductive patterns were approximately synchronous throughout the local range of this species, with clams maturing in July and spawning in August. However, spatiotemporal variation in reproductive patterns was detected along the brackish water environmental gradient, especially at the edge of the distribution range where a delay in reproduction was observed. Such spatiotemporal variation in reproductive patterns is likely to have arisen due to factors such as water temperature, salinity, turbidity and environmental stress, which are typical of brackish water environments and which are a#ected by freshwater inputs upstream and tidal inflows downstream. The reproduction and viability of this population are strongly a#ected by local variations in temperature, salinity and anoxic conditions below the halocline of Lake Abashiri, which is located along the northern edge of the distribution range of C. japonica. Key Words: Abashiri River basin, brackish water clam, Corbicula, Lake Abashiri, reproductive pattern Corbicula japonica,./012 3 4 5! "#678 9 9: ;<= "$>?@A %=&( 7 B'( C(DEFGHIJ K)* 2000L# 1,000 MN (C @O 8GA%(P, QR S+ TUR V W XY ,-Y K./ 01 ,L GZ@ O K 2= [ \]34^ 2009L# 5A(C6, 19657./ 19707 4_58 9 >IJ`@ K)* 2000La b,cd e:f`ZHI g20067 (C6,9 h*^7 13,412 F GHIJ K 2= [ \]34^ 2009L# (C6 cdij,; <= Gklmn>"#67 O o02 pq6cdFr ?3 @A7Og KsB 2002; " / 2009L%=&(C(DEF>Itu IB'G ( vw C5,o02 D DxG2yzfE{IJ @|}7O K~: =F 2009L . G+7, @r8'G (P7O g7 H 800  >I7 H 5 58 KI  157_197IJ % 2008L (C@O # 7, ; y  Palaemon paucidens, z Eriocheir japonicaGZ  y ;0  Hypomesus nipponensis,  Salangichthys microdon GZ@(C K % 2008LG+ %=&(P FGHIJ # ,& 32.3 km0 42 km = 16.1 mI= 6.1 m  7& 1,380 km K0 115 km 1 9 =¡ LM ¢N>I g./ KH 7 km f£I¤ ¥zFOP>IJ KG+¦Q§ ¦Q ̈© 1994L# a«./012 ¬7 ­JRS T 3 FHI, GM ¢N>IJ F®{/U ̄°7O ±2 =3F ́ @pqμ" B'G¶·' ̧ GHIJ 1F@Oo/. IJ

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Spatiotemporal Spawning Patterns in a Local Population of Brackish Water Clam, &lt;i&gt;Corbicula japonica&lt;/i&gt;, in Lake Abashiri and the Abashiri River, Northern Japan