02695nas a2200289   4500008004100000245012300041210006900164300001000233490000700243520171800250653001101968653001101979653002101990653001502011653002702026653002602053100001702079700001802096700002402114700002502138700002402163700002402187700001702211700001802228700002102246856013802267       1995                        eng d00aSeasonality and vertical structure of light-attracted insect communities in a dipterocarp forest in Sarawak [Malaysia]0 aSeasonality and vertical structure of lightattracted insect comm  a59-790 v373 aNocturnal flying insects were collected monthly for 13 months using ultra violet light-traps set at various vertical levels in a weakly-seasonal, tropical lowland dipterocarp forest in Sarawak, Malaysia. Abundance, faunal composition, size distribution and guild structure of these samples were analyzed with respect to temporal and vertical distributions. The nocturnal flying insect com- munity in the canopy level was highly dominated by fig wasps (84~) in individual number, and by scarabaeid beetles (28%) in weight. A principal component analysis on monthly catches detected non-random, seasonal trends of insect abundance. The first two principal trends were an alternation of wetter (September to January) and less wet seasons (February to August) and an alternation be- tween the least wet (January to March) and the other seasons. Many insect groups were less abundant in the least wet season than the other seasons, whilst inverse patterns were found in Scarabaeidae and Tenebrionidae. Significantly positive and negative correlations between monthly catch and rainfall were detected only in ovule-feeders and in phloem-feeders, respectively. Delayed, significant negative correlations between monthly catch and 1-3 month preceding rainfall were more frequently detected in phytophages, phloem-feeders, seed-feeders, wood-borers and scavengers. The peak in abundance along vertical levels were found at the canopy level (35 m) for phloem-, ovule-, seed-, root-, fungal- feeders and nectar collectors, at an upper subcanopy level (25 m) for scavengers and aquatic predators, and at a middle subcanopy level (17 m) for ants. Catches at the emergent level (45 m) did not exceed those at the canopy level. 10aBorneo10acanopy10ainsect community10alight-trap10aseasonality in tropics10avertical distribution1 aKato, Makoto1 aInoue, Tamiji1 aHamid, Abang, Abdul1 aNagamitsu, Teruyoshi1 aBen Merdek, Mahamud1 aNona, Abdul, Rahman1 aItino, Takao1 aYamane, Seiki1 aYumoto, Takakazu  uhttps://scarabnet.myspecies.info/seasonality-and-vertical-structure-light-attracted-insect-communities-dipterocarp-forest-sarawak-mal02471nas a2200265   4500008004100000245012300041210006900164300001100233490000700244520158100251653001101832653002201843653001501865653001301880653002401893653001701917100001701934700001801951700001701969700002101986700001802007700002402025700001802049856013802067       2000                        eng d00aVarious population fluctuation patterns of light-attracted beetles in a tropical lowland dipterocarp forest in Sarawak0 aVarious population fluctuation patterns of lightattracted beetle  a97-1040 v423 aThe population fluctuation pattern of light- attracted beetles was studied from August 1992 to Septem- ber 1998 (for 73 months) using ultraviolet light-traps set at three vertical levels in a tropical lowland dipterocarp forest in Sarawak, Malaysia. During our study, a general flowering occurred from April to July in 1996, and flowering on a small scale in 1997 and 1998. We analyzed the data for eight scarabaeid and six meloid species, some of which were anthophilous species. Various fluctuation patterns were observed among the beetle species in aspects of both seasonality and correlation with the supraannual pheno- logical pattern. Three large chafer species (Scarabaeidae, Melolonthini) showed a clear seasonal fluctuation pattern with a peak once from March to May every year, the peak monthly catch greatly fluctuating annually. Other scara- baeid beetles did not show such a clear seasonal population pattern and hardly fluctuated annually. Populations of an anthophilous scarabaeid species, Parastasia bimaculata, a specific pollinator of Homalomena propinqua (Araceae), hardly fluctuated, probably because of its response to the constant flowering of its floral hosts. Monthly catches of an anthophilous scarabaeid, Anomala sp., and meloid beetles showed clear supraannual patterns in response to the gen- eral flowering and were significantly correlated with the flowering intensity with or without a lag of a month. The fluctuation pattern of meloids suggests a supraannual popu- lation fluctuation pattern of their hosts, i.e., megachilid/ anthophorid bees. 10aBorneo10aGeneral flowering10alight-trap10aMeloidae10aPopulation dynamics10aScarabaeidae1 aKato, Makoto1 aItioka, Takao1 aSakai, Shoko1 aMomose, Kuniyasu1 aYamane, Seiki1 aHamid, Abang, Abdul1 aInoue, Tamiji  uhttps://scarabnet.myspecies.info/various-population-fluctuation-patterns-light-attracted-beetles-tropical-lowland-dipterocarp-forest-