Knowledge (XXG)

Western pearlshell

Source 📝

31: 82: 57: 251:. Some scientists consider a number of the coastal and large river populations of this species to be already extirpated, nearly extirpated, or declining rapidly. However, this species is still common throughout parts of the northern Rocky Mountains, although some populations in 372:
Frest, T.J. and E. J. Johannes. 1995. Interior Columbia Basin mollusk species of special concern. Final report to the Interior Columbia Basin Ecosystem Management Project, Walla Walla, WA. Contract #43-0E00-4-9112. 274 pp. plus
382:
Brim Box, K., J. Howard, D. Wolf, C. O'Brian, D. Nez, and D. Close. 2006. Freshwater mussels (Bivalvia: Unionoida) of the Umatilla and Middle Fork John Day rivers in eastern Oregon.
553: 672: 605: 527: 566: 682: 687: 296:
are thought to have crossed the Continental Divide from the West into the headwaters of the present-day Missouri River during the
644: 412: 571: 280:, which means that the species somehow was able to cross the divide. The most likely explanation for this distribution is 81: 30: 488: 272: 519: 610: 466: 293: 677: 428: 192: 493: 176: 281: 649: 475: 227:. This species can be found only in the United States and Canada, where it occurs mostly west of the 300:
glaciation, more that 20,000 years ago. Since cutthroat trout are an important host species for the
46: 597: 416: 259: 213: 76: 558: 631: 584: 501: 244: 224: 143: 636: 618: 289: 228: 61: 326: 514: 395:
Gangloff, M. M. and D.L. Gustafson. 2000. The mussels (Bivalvia: Unionida) of Montana.
285: 267: 480: 666: 579: 335: 153: 66: 308:, it is likely that the mussels crossed the divide by hitching a ride on the trout. 506: 360:. National Museum of Natural Sciences, National Museums of Canada, Ottawa. 446 pp. 592: 540: 460: 297: 451: 263: 240: 301: 93: 623: 276:, but recently scientists have confirmed that the populations are in fact 445: 133: 123: 113: 532: 252: 220: 217: 545: 270:. Originally these populations were identified as the eastern species 248: 103: 422: 239:
This species of pearl mussel is found in Pacific drainages from
426: 325:
Blevins, E.; Jepsen, S.; Brim Box, J. & Nez, D. (2016).
435: 415:documentary on species population and health ( 8: 423: 55: 29: 20: 352: 350: 368: 366: 317: 258:The species is also found east of the 673:IUCN Red List near threatened species 7: 413:Freshwater Mussels Of The Willamette 336:IUCN Red List of Threatened Species 14: 358:The Freshwater Molluscs of Canada 80: 1: 683:Molluscs of the United States 288:were cut and reconfigured by 273:Margaritifera margaritifera 704: 688:Bivalves described in 1850 397:Central Plains Archaeology 294:Westslope cutthroat trout 182: 175: 77:Scientific classification 75: 53: 44: 37: 28: 23: 343:: e.T91109639A114128748. 467:Margaritifera falcata 437:Margaritifera falcata 209:Margaritifera falcata 186:Margaritifera falcata 39:Margaritifera falcata 356:Clarke, A. H. 1981. 329:Margatifiera falcata 284:, where pre-glacial 216:, a pearl mussel, a 212:) is a species of 47:Conservation status 24:Western pearlshell 417:Oregon Field Guide 260:Continental Divide 255:may be declining. 214:freshwater bivalve 204:western pearlshell 16:Species of bivalve 660: 659: 632:Open Tree of Life 429:Taxon identifiers 384:Northwest Science 282:headwater capture 200: 199: 70: 695: 653: 652: 640: 639: 627: 626: 614: 613: 601: 600: 588: 587: 575: 574: 562: 561: 549: 548: 536: 535: 523: 522: 510: 509: 497: 496: 484: 483: 471: 470: 469: 456: 455: 454: 424: 400: 393: 387: 380: 374: 370: 361: 354: 345: 344: 322: 245:British Columbia 225:Margaritiferidae 188: 144:Margaritiferidae 85: 84: 64: 59: 58: 33: 21: 703: 702: 698: 697: 696: 694: 693: 692: 663: 662: 661: 656: 648: 643: 635: 630: 622: 619:Observation.org 617: 609: 604: 596: 591: 583: 578: 570: 565: 557: 552: 544: 539: 531: 526: 518: 513: 505: 500: 492: 487: 479: 474: 465: 464: 459: 450: 449: 444: 431: 409: 404: 403: 394: 390: 381: 377: 371: 364: 355: 348: 324: 323: 319: 314: 290:glacial advance 237: 229:Rocky Mountains 196: 190: 184: 171: 168:M. falcata 79: 71: 62:Near Threatened 60: 56: 49: 17: 12: 11: 5: 701: 699: 691: 690: 685: 680: 675: 665: 664: 658: 657: 655: 654: 641: 628: 615: 602: 589: 576: 563: 550: 537: 524: 515:Fauna Europaea 511: 498: 485: 472: 457: 441: 439: 433: 432: 427: 421: 420: 408: 407:External links 405: 402: 401: 388: 375: 362: 346: 316: 315: 313: 310: 268:Missouri River 236: 233: 223:in the family 198: 197: 191: 180: 179: 173: 172: 165: 163: 159: 158: 151: 147: 146: 141: 137: 136: 131: 127: 126: 121: 117: 116: 111: 107: 106: 101: 97: 96: 91: 87: 86: 73: 72: 54: 51: 50: 45: 42: 41: 35: 34: 26: 25: 15: 13: 10: 9: 6: 4: 3: 2: 700: 689: 686: 684: 681: 679: 678:Margaritifera 676: 674: 671: 670: 668: 651: 646: 642: 638: 633: 629: 625: 620: 616: 612: 607: 603: 599: 594: 590: 586: 581: 577: 573: 568: 564: 560: 555: 551: 547: 542: 538: 534: 529: 525: 521: 516: 512: 508: 503: 499: 495: 490: 486: 482: 481:Margaritifera 477: 473: 468: 462: 458: 453: 447: 443: 442: 440: 438: 434: 430: 425: 418: 414: 411: 410: 406: 398: 392: 389: 385: 379: 376: 369: 367: 363: 359: 353: 351: 347: 342: 338: 337: 332: 330: 321: 318: 311: 309: 307: 303: 299: 295: 291: 287: 283: 279: 275: 274: 269: 265: 261: 256: 254: 250: 247:and southern 246: 242: 234: 232: 230: 226: 222: 219: 215: 211: 210: 205: 194: 189: 187: 181: 178: 177:Binomial name 174: 170: 169: 164: 161: 160: 157: 156: 155:Margaritifera 152: 149: 148: 145: 142: 139: 138: 135: 132: 129: 128: 125: 122: 119: 118: 115: 112: 109: 108: 105: 102: 99: 98: 95: 92: 89: 88: 83: 78: 74: 68: 63: 52: 48: 43: 40: 36: 32: 27: 22: 19: 436: 399:8(1):121-130 396: 391: 383: 378: 357: 340: 334: 328: 320: 305: 292:or retreat. 277: 271: 257: 238: 235:Distribution 208: 207: 203: 201: 185: 183: 167: 166: 154: 38: 18: 593:NatureServe 541:iNaturalist 461:Wikispecies 373:appendices. 298:Pleistocene 667:Categories 312:References 306:M. falcata 304:larvae of 286:watersheds 278:M. falcata 264:headwaters 241:California 386:80:95-107 302:glochidia 243:north to 162:Species: 100:Kingdom: 94:Eukaryota 598:2.107100 585:91109639 559:10239201 452:Q3803562 446:Wikidata 140:Family: 134:Unionida 124:Bivalvia 114:Mollusca 110:Phylum: 104:Animalia 90:Domain: 67:IUCN 3.1 533:2287872 266:of the 262:in the 253:Montana 221:mollusk 218:bivalve 150:Genus: 130:Order: 120:Class: 65: ( 650:857186 624:946966 546:148212 249:Alaska 195:, 1850 645:WoRMS 637:88260 611:52361 572:80372 554:IRMNG 520:97602 507:3Y44D 494:28160 193:Gould 606:NCBI 580:IUCN 567:ITIS 528:GBIF 489:BOLD 341:2016 202:The 502:CoL 476:ADW 669:: 647:: 634:: 621:: 608:: 595:: 582:: 569:: 556:: 543:: 530:: 517:: 504:: 491:: 478:: 463:: 448:: 365:^ 349:^ 339:. 333:. 231:. 419:) 331:" 327:" 206:( 69:)

Index


Conservation status
Near Threatened
IUCN 3.1
Scientific classification
Edit this classification
Eukaryota
Animalia
Mollusca
Bivalvia
Unionida
Margaritiferidae
Margaritifera
Binomial name
Gould
freshwater bivalve
bivalve
mollusk
Margaritiferidae
Rocky Mountains
California
British Columbia
Alaska
Montana
Continental Divide
headwaters
Missouri River
Margaritifera margaritifera
headwater capture
watersheds

Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.