Ecology of terrestrial gastropods and their response to conifer release treatments in northwestern Ontario
Notice bibliographique
Résumé
The primary objective of this study was to document any changes in terrestrial \ngastropod species richness and density associated with alternative methods of managing \ncompeting vegetation on regenerating conifer plantations. Pre-treatment data were \ncollected in 1993 and post-treatment data in 1994, following application of four conifer \nrelease treatments including, two chemical herbicides (Vision? and Release?), removal of \nvegetation by mechanical means (Silvana Selective/Ford Versatile), and manual cutting \nwith brushsaws. Gastropod densities were estimated using cardboard sheets. A total of \n47,595 gastropods was collected over the two years, comprising 21 species. No change \nin gastropod richness or density was detected between the four conifer release areas and \nthe control in 1994, despite changes in vegetation cover following treatments. This was \nattributed to rapid re-establishment of the herbaceous layer following treatments which \nprobably continued to provide favourable conditions for snails and slugs. \nSpecies richness and density of gastropods in a 9-year-old regenerating conifer \nplantation and an adjacent 70-year-old mixedwood forest were compared. Gastropod \ndensity was higher on the regenerating plantation (15.5?1.3 m-2) than in the mature forest \n(9.4?0.6 m-2) and species richness was also slightly greater (20 spp. vs. 18 spp., \nrespectively). These differences were attributed to the more abundant near-ground \nvegetation and the greater amount of deciduous litter characterizing the regenerating \nplantation. \nNear ground temperature was measured on the four conifer release areas and the control using thermocouples. Temperature was measured 2 cm above cardboard sheets, \ndirectly beneath the sheets, and 2 cm deep in the humus layer. Results suggest that \ntemperatures were not affected by the release treatments. Temperatures above and \nbeneath the sheets were similar and greater than those in the humus layer throughout the \nearly part of the summer. In August, temperature above and beneath the sheets cooled \nto below that in the humus layer. Gastropod collections were greatest when the \ntemperature beneath the cardboard sheets was approximately 15?C. \nPossible limitations associated with the cardboard sheet sampling method were \ninvestigated. Gastropod collections from sheets enclosed with a barrier were compared \nto unenclosed sheets to determine the extent of horizontal movement. The mean density \nrecovered beneath enclosed sheets (2.1?0.2 m-2) was less than that from unenclosed sheets \n(3.1db0.4 m-2) suggesting horizontal movement to the sheets does occur. However, \nwhether gastropods are actually attracted to the sheets remains unknown. Gastropod \ncollections from weathered sheets were contrasted with those from new sheets. Overall, \ntotal mean densities of gastropods from weathered sheets (27.3?4.1 m-2) and new sheets \n(16.2?2.6 m-2) did not differ, but four species were collected in greater numbers on the \nweathered sheets suggesting differential use of cardboard sheets by particular species.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».