Community structure of pre-dispersal seed predatory insects on eleven<i>Shorea</i>(Dipterocarpaceae) species

Hosaka, Tetsurō; Yumoto, Takakazu; Kojima, Hiroaki; Komai, Furumi; Noor, Nur Supardi Md.

doi:10.1017/s0266467409990265

Cited by 17 publications

(29 citation statements)

References 41 publications

(101 reference statements)

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“…, Hosaka et al . ). In this study, the percentage of developing fruit killed by generalist pre‐dispersal insect seed predators ranged from 14 ( S. maxwelliana in GF2002) to 63 percent ( S. lepidota in GF2002) (Fig.…”

Section: Discussionmentioning

confidence: 97%

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Responses of pre‐dispersal seed predators to sequential flowering of Dipterocarps in Malaysia

et al. 2016

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Many species of Dipterocarpaceae and other plant families reproduce synchronously at irregular, multi-year intervals in Southeast Asian forests. These community-wide general flowering events are thought to facilitate seed survival through satiation of generalist seed predators. During a general flowering event, closely related Shorea species (Dipterocarpaceae) stagger their flowering times by several weeks, which may minimize cross pollination and interspecific competition for pollinators. Generalist, pre-dispersal seed predators might also track flowering hosts and influence predator satiation. We addressed the question of whether pre-dispersal seed predation differed between early and late flowering Shorea species by monitoring flowering, fruiting and seed predation intensity over two general flowering events at the Pasoh Research Forest, Malaysia. Pre-dispersal insect seed predators killed up to 63 percent of developing seeds, with Nanophyes shoreae, a weevil that feeds on immature seeds being the most important predator for all Shorea species. This weevil caused significantly greater pre-dispersal seed predation in earlier flowering species. Long larval development time precluded oviposition by adults that emerged from the earliest flowering Shorea on the final flowering Shorea. In contrast, larvae of weevils that feed on mature seeds before seed dispersal (Alcidodes spp.), appeared in seeds of all Shorea species almost simultaneously. We conclude that general flowering events have the potential to satiate post-dispersal seed predators and pre-dispersal seed predators of mature fruit, but are less effective at satiating pre-dispersal predators of immature fruit attacking early flowering species.Abstract in Malay is available with online material.

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Section: Discussionmentioning

confidence: 97%

“…The three weevils are primarily specific to Shorea seeds (Toy , Lyal & Curran , Hosaka et al . ). Since the two large weevils have similar ecological traits ( e.g., the timing of abortion of fruits containing larvae and adult emergence), we combined their data in the present study.…”

Section: Methodsmentioning

confidence: 97%

Responses of pre‐dispersal seed predators to sequential flowering of Dipterocarps in Malaysia

et al. 2016

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“…Dipterocarpaceae species are insect-pollinated; a variety of insects have been implicated in its pollination [18]. However, damage by seed insects is a serious problem before the seeds are being dispersed [19] [20] [21] is one of the factors that contribute to limit the regeneration of D. semivestitus.…”

Section: Major Constraints To Natural Regenerationmentioning

confidence: 99%

“…However, damage by seed insects is a serious problem before the seeds are being dispersed [19] [20] [21] is one of the factors that contribute to limit the regeneration of D. semivestitus. While, another factor contribute to limit the natural regeneration of Dipterocarpaceae species is the seed dispersal, which depends on the height of the release point; so taller trees disperse their seed more extensively [22].…”

Section: Major Constraints To Natural Regenerationmentioning

confidence: 99%

Conservation of the critically endangered tree species Dipterocarpus semivestitus in Malaysia

Liliwirianis

Suratman

Tahir

2013

2013 IEEE Business Engineering and Industrial Applications Colloquium (BEIAC)

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Dipterocarpaceae is a tree family which consists of 17 genera and approximately 475 species. The Malaysian Plant Red List of Peninsular Malaysia Dipterocarpaceae reported that 35 species are endangered and 15 species are critically endangered. Of the critically endangered species, six are endemics to Peninsular Malaysia in which Dipterocarpus semivestitus or locally known as Keruing padi falls under this category as listed by the Red List and International Union for Conservation of Nature (IUCN). Historical records show that this species grows only in two places in the world; central Kalimantan and Perak. In 2006, Forest Research Institute Malaysia (FRIM) researchers discovered a total of 53 trees of D. semivestitus in a patch of freshwater swamp forest in the Universiti Teknologi MARA (UiTM) campus in Sri Iskandar, Perak. The stands are reported to be the last population of D. semivestitus in the world as the forest area in central Kalimantan population has been converted into oil palm.In order to protect the species, there is an urgent need for conservation measures to be taken to monitor the populations and aid its recovery and restoration. This paper highlights the distribution, habitat, conservation status, morphological characteristics as well as threat to this species. This information is not only much needed as there are gaps in our understanding of critically endangered plants, but also is essential for the management and conservation of country's botanical heritage.

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“…The species composition of seed predators and the changes in resource partitioning of seed predator assemblages over time differ among regions and sites (Curran and Leighton 2000;Nakagawa et al 2003;Sun et al 2007;Hosaka et al 2009Hosaka et al , 2011. Therefore, further empirical research should be conducted at various sites to elucidate the evolutionary and ecological mechanisms affecting CM in Southeast Asian tropical rainforests.…”

Section: Introductionmentioning

confidence: 99%

Increased seed predation in the second fruiting event during an exceptionally long period of community‐level masting in Borneo

Iku

Itioka

Kishimoto‐Yamada

et al. 2017

Ecological Research

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In Southeast Asian tropical rainforests, community‐level masting (CM) occurs at irregular intervals of 2–10 years. During CM periods, many plant species from various families synchronously flower and subsequently undergo community‐level fruiting. Seed predation is a key factor in understanding the ecological and evolutionary factors affecting CM. Masting is proposed to decrease seed mortality due to predation in two ways: by depressing predator abundance through extended and unpredictable absences of seeds; and by satiating predators via mass seed production (predator satiation hypothesis). If the hypothesis is valid in these rainforests, the incidence of seed predation will be higher in a fruiting event that occurs soon after a previous fruiting event, because the intervening period of seed absence would be inadequate to starve the predators. In this study, we examined seed predation by insects, focusing on five dipterocarp species that exceptionally reproduced twice during an extended CM period. All of the five species suffered more intense seed predation in the second fruiting event, consistent with the prediction expected from the predator satiation hypothesis. Weevils, bark beetles and mammals were the main cause of increased seed predation in three, one and one plant species, respectively. However, seed predation intensity did not increase during the second fruiting event in a few combinations of predator and plant species. We discuss the possibility that competition for seeds among predators and/or the interspecific differences in life history traits among predators might affect the varying intensities of seed predation among dipterocarp species by different seed predators.

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Community structure of pre-dispersal seed predatory insects on elevenShorea(Dipterocarpaceae) species

Cited by 17 publications

References 41 publications

Responses of pre‐dispersal seed predators to sequential flowering of Dipterocarps in Malaysia

Responses of pre‐dispersal seed predators to sequential flowering of Dipterocarps in Malaysia

Conservation of the critically endangered tree species Dipterocarpus semivestitus in Malaysia

Increased seed predation in the second fruiting event during an exceptionally long period of community‐level masting in Borneo

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