title: Convergence in floodplain pond communities indicates different pathways to community assembly

authors: Chanut, P. C. M.

subjects: Disturbance

abstract: Disturbance can strongly influence ecosystems, yet much remains unknown about the relative importance of key processes (selection, drift, and dispersal) in the recovery of ecological communities following disturbance. We combined field surveys with a field experiment to elucidate mechanisms governing the recovery of aquatic macroinvertebrates in habitats of an alluvial floodplain following flood disturbance. We monitored macroinvertebrates in 24 natural parafluvial habitats over 60 days after a major flood, as well as the colonization of 24 newly-built ponds by macroinvertebrates over 45 days in the same floodplain. We examined the sources of environmental variation and their relative effects on aquatic assemblages using a combination of null models and Mantel tests. We also used a joint species distribution model to investigate the importance of primary metacommunity structuring processes during recovery: selection, dispersal, and drift. Contrary to expectations, we found that beta diversity actually decreased among natural habitats over time after the flood or the creation of the ponds, instead of increasing. This result was despite environmental predictors showing contrasting patterns for explaining community variation over time in the natural habitats compared with the experimental ponds. Flood heterogeneity across the floodplain and spatial scale differences between the experimental ponds and the natural habitats seemingly constrained the balance between deterministic and stochastic processes driving the ecological convergence of assemblages over time. While environmental selection was the dominant structuring process in both groups, biotic interactions also had a prominent influence on community assembly. These findings have profound implications towards understanding metacommunity structuring in riverscapes that includes common linkages between disturbance heterogeneity, spatial scale properties, and community composition.

text: Convergence in floodplain pond communities indicates different pathways to community assembly Disturbance can strongly influence ecosystems, yet much remains unknown about the relative importance of key processes (selection, drift, and dispersal) in the recovery of ecological communities following disturbance. We combined field surveys with a field experiment to elucidate mechanisms governing the recovery of aquatic macroinvertebrates in habitats of an alluvial floodplain following flood disturbance. We monitored macroinvertebrates in 24 natural parafluvial habitats over 60 days after a major flood, as well as the colonization of 24 newly-built ponds by macroinvertebrates over 45 days in the same floodplain. We examined the sources of environmental variation and their relative effects on aquatic assemblages using a combination of null models and Mantel tests. We also used a joint species distribution model to investigate the importance of primary metacommunity structuring processes during recovery: selection, dispersal, and drift. Contrary to expectations, we found that beta diversity actually decreased among natural habitats over time after the flood or the creation of the ponds, instead of increasing. This result was despite environmental predictors showing contrasting patterns for explaining community variation over time in the natural habitats compared with the experimental ponds. Flood heterogeneity across the floodplain and spatial scale differences between the experimental ponds and the natural habitats seemingly constrained the balance between deterministic and stochastic processes driving the ecological convergence of assemblages over time. While environmental selection was the dominant structuring process in both groups, biotic interactions also had a prominent influence on community assembly. These findings have profound implications towards understanding metacommunity structuring in riverscapes that includes common linkages between disturbance heterogeneity, spatial scale properties, and community composition.

year: 2023

title: How kids see search: a visual analysis of internet search engines

authors: Vanderschantz, Nicholas

subjects: computer science

abstract: Through previous studies into children’s internet search practice, we have gained insight into the taught strategies, information behaviour, and common errors children experience while searching. This paper analyses the visual structure of commonly-used internet search engines (ISEs) to explore how the interface and interaction design of ISEs may influence the search practices of children. Common features of ISEs are identified and the effects of query construction techniques on the visual presentation of information are reported. We use our observations to provide guidelines for the design and development of ISEs for children

text: How kids see search: a visual analysis of internet search engines Through previous studies into children’s internet search practice, we have gained insight into the taught strategies, information behaviour, and common errors children experience while searching. This paper analyses the visual structure of commonly-used internet search engines (ISEs) to explore how the interface and interaction design of ISEs may influence the search practices of children. Common features of ISEs are identified and the effects of query construction techniques on the visual presentation of information are reported. We use our observations to provide guidelines for the design and development of ISEs for children

year: 2017

title: Ngā ia nōnoke taketake

authors: Manuirirangi, Hōri

subjects: whātōtō nōnoke mamau

abstract: Tā tēnei tuhinga, he titiro ki ngā kōrero onamata mō ngā mahi nōnoke a te Māori. I mua, whāia ai te nōnoke e ētehi hapori Māori hei koringa tinana, hei tū hākinakina, hei tākaro hoki. Ko te nōnoke, te whātōtō, te taitai me te mamau, he rite katoa. Nō te kuhutanga mai o ngā tini whakaawenga a tauiwi, ka nui hoki te Māori i tahuri ki hākinakina kē. Nāwhai ā ka mimiti te whāia o te nōnoke. Kei tēnei tuhinga, ka āta wetekina ngā kupu me ngā kōrero o te reo nōnoke o mua, arā ngā tohutohu a ngā pāhake e whakaahua ana i ngā tūmomo neke, i ngā whiu me ngā puringa mahia ai e te kaiwhātōtō. Ka arohaehaetia tēnei mea te karakia, te waiata me te pepeha kia kuhuna ai te hinengaro o te kaiwhātōtō e mārama rawa ai te ia o ōna whakaaro, tōna waiaro me tōna whanonga. Waihoki ko ngā pūrākau o mua, kua whakaemia ētehi tauira kia tīroua ngā karere i whaona ki roto. Ko te tino whāinga, ko te whera i ngā rangahau nei kia āta mōhio ki ngā koronga me ngā horopaki whāia ai e te Māori o mua ngā mahi nōnoke.

text: Ngā ia nōnoke taketake Tā tēnei tuhinga, he titiro ki ngā kōrero onamata mō ngā mahi nōnoke a te Māori. I mua, whāia ai te nōnoke e ētehi hapori Māori hei koringa tinana, hei tū hākinakina, hei tākaro hoki. Ko te nōnoke, te whātōtō, te taitai me te mamau, he rite katoa. Nō te kuhutanga mai o ngā tini whakaawenga a tauiwi, ka nui hoki te Māori i tahuri ki hākinakina kē. Nāwhai ā ka mimiti te whāia o te nōnoke. Kei tēnei tuhinga, ka āta wetekina ngā kupu me ngā kōrero o te reo nōnoke o mua, arā ngā tohutohu a ngā pāhake e whakaahua ana i ngā tūmomo neke, i ngā whiu me ngā puringa mahia ai e te kaiwhātōtō. Ka arohaehaetia tēnei mea te karakia, te waiata me te pepeha kia kuhuna ai te hinengaro o te kaiwhātōtō e mārama rawa ai te ia o ōna whakaaro, tōna waiaro me tōna whanonga. Waihoki ko ngā pūrākau o mua, kua whakaemia ētehi tauira kia tīroua ngā karere i whaona ki roto. Ko te tino whāinga, ko te whera i ngā rangahau nei kia āta mōhio ki ngā koronga me ngā horopaki whāia ai e te Māori o mua ngā mahi nōnoke.

year: 2017