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sible to make production calculations. Whilethere is a cyclicity in standing crop at station 2(mid intertidal zone), this is not the case at station1 (lower intertidal zone). Species diversityshowed reasonable annual cyclicity at both stations.At neither station is there any correlationbetween the size of the standing crop and thechlorophyll a content of the surface sediment.There was some cyclicity in the peaks of biomass(only determined for sta. 1) in all threespecies and considerable variability from oneyear to the next. Thus this area is extremelyvariable, there is no obvious annual pattern instanding crop, and the best measures of seasonalityseem to be species diversity and biomass.2008040266人 工 海 草 上 的 有 孔 虫 群 集 化 = Foraminiferalcolonization on artificial seagrass leaves. ( 英 文 ).Ribes T; Humbert Salvadó. Journal of ForaminiferalResearch, 2000, 30(3): 192-201 1 图版 .Colonization of seagrass leaves was studiedusing artificial ribbon-like substrates. The studywas carried out in a seagrass (Posidonia oceanica(L.) Delile) meadow off the Medes Islands(NW Mediterranean). Artificial leaves of differentcolors and textures were immersed at twodepths (5 and 13m), and retrieved after 3 and 6months; epiphytic foraminifera were identifiedand counted, and the results were compared withthose obtained from natural leaves. Althoughsome differences were found in the colonizationof the various types of artificial leaf (e.g.,smooth, green leaves with float bladder had thehighest number of individuals and species)ANOVA and cluster analyses revealed that thetype of substrate did not significantly affect thecolonization by foraminifera; the main sourcesof variability were mainly seasonality and, to aminor extent, water depth. Thus, the dominantspecies were the same in both natural and artificialleaves. The calcareous perforated shells andthe trochospiral morphotype were the mostabundant, and the dominant biological typeswere groups B and C, i.e., temporarily or permanentlymobile species.2008040267突 尼 斯 Ain Settara 地 区 白 垩 纪 / 古 近 纪(K/P) 界 线 浮 游 有 孔 虫 突 然 灾 难 性 集 群 灭绝 = The Cretaceous/Paleogene (K/P) boundaryat Ain Settara, Tunisia: sudden catastrophic massextinction in planktic foraminifera. ( 英 文 ).Arenillas I; José A Arz. Journal of ForaminiferalResearch, 2000, 30(3): 202-218 2 图 版 .The quantitative study and high resolutionsampling of an essentially continuous and expandedCretaceous/ Paleogene (K/P) boundarysection in Tunisia allow us to test the model ofextinction in planktic foraminifera. The extinctionat the Aïn Settara section occurred over ashort period of time similar to the Tunisian sectionsat El Kef and Elles and the Spanish sectionsat Agost, Caravaca and Zumaya. At AïnSettara only 3 species disappeared in the latestMaastrichtian, 45 became extinct precisely at theK/P boundary and 18 disappeared in the earliestDanian. The species that became extinct at theK/P boundary constitute about 20% of the individualsin the population larger than 63 micronsand 68% of the species, which suddenly becameextinct in a catastrophic event precisely coincidingwith the layer containing evidence for anasteroid impact. Most of these species are large,complex and low latitude deeper to intermediatedwelling forms. This extinction event is clearlythe most important catastrophic mass extinctionrecorded in the history of planktic foraminifera.This pattern of extinction is superimposed on acontroversial gradual pattern of extinction of 21species that apparently began in the latest Maastrichtianand ended in the early Danian. TheMaastrichtian species that seem to become extinctgradually are generally small, cosmopolitanand simple surface dwellers. The catastrophicmass extinction of the 45 species coincident withthe K/P boundary is compatible with the effectof the impact of a large asteroid, whereas thegradual extinction of 18 species in the basalDanian could also be attributed to the long termdisruptive effect of the impact.2008040268西 班 牙 坎 塔 布 连 山 脉 Las Llacerias 剖 面 一 些Moscovian 晚 期 和 Kasimovian 期 的 蜓 类 =Some Late Moscovian and Kasimovian fusulinaceansfrom the Las Llacerias section (Cantabrianmountains,Spain). ( 英 文 ). Villa E; Ginkel A C V.Journal of Foraminiferal Research, 2000, 30(3):219-243 7 图 版 .The upper part of the Las Llacerias sectionshows an exceptionally complete sequence ofUpper Moscovian (Myachkovsky) and Kasimovian(Krevyakinsky-Khamovnichesky) stratawhich yielded fusulinacean foraminifera fromnumerous beds throughout the succession. Inaddition to the advanced fusulinellins and primitiveschwagerinins described already in a separatepaper, the present work completes the studyof the fusulinacean fauna with the description ofadditional fusulinids, schubertellinids, andozawainellids. The fusulinaceans of the studiedpart of this section provide a basis for recognizingthree biozones, i.e., the Fusulinella, Protriticitesand Montiparus Zones, and they allowa correlation of the Las Llacerias strata with theMoscow Basin and the Donets Basin. An earlyschwagerinid species intermediate between Pro-86