Determining the extent to which weather-related abiotic factors influence daily variation in early benthic phase mortality of intertidal marine invertebrates
Notice bibliographique
Résumé
Populations of marine intertidal invertebrates vary substantially in abundance from year to year. These differences might be partly due to cohorts experiencing 60 – 99% mortality during the first few days after the transition from pelagic to benthic environments. However, the causes of this mortality, including the role of weather conditions experienced during low tide, are not well understood. This study aimed to improve our understanding of the influence of low tide environmental stress on survival through the early benthic phase by (1) determining the influence of temperature and desiccation stress on mortality of newly settled mussels and the ontogeny of sensitivity to these stresses through the early benthic phase; (2) examining the mortality of barnacle cyprids from settlement to metamorphosis and mortality of early juveniles up to the age of 10 days after metamorphosis; and (3) documenting the frequency of occurrence of lethal conditions occurring in the field at low tide during the recruitment season.\nLaboratory experiments revealed that newly settled Mytilus trossulus of 1-2 mm shell length experienced a temperature tolerance threshold at 34°C and a desiccation tolerance threshold at a vapour pressure deficit level of 1.01 kPa. Mussels became highly tolerant to desiccation stress when they reached a size of 3 mm shell length, suggesting a size threshold of desiccation tolerance between 2-3 mm shell length. This size closely corresponds to the size at which some studies have reported juvenile M. trossulus relocate from protective filamentous algal habitat to adult habitat, suggesting ontogenetic shifts in habitat use by juvenile M. trossulus may be a response to changing vulnerability to desiccation stress.\nA field survey of Balanus glandula recruitment revealed that cyprid and juvenile mortality varied greatly among daily cohorts and was significantly higher under Fucus spp. cover than on bare surfaces. Contrary to expectations, cyprid mortality was not significantly influenced by weather-related abiotic conditions. This was likely due to the study being conducted during a La Niña cycle that may have had lower temperature and desiccation stress than is typical for Barkley Sound.\nIntertidal temperatures above the threshold tolerance levels for newly settled mussels were uncommon during the recruitment season, suggesting that temperature stress is not likely an important factor influencing early benthic phase mortality of mussels. The desiccation stress threshold level for newly settled mussels was frequently exceeded for several hours during the recruitment season, however, suggesting that desiccation stress may be an important factor influencing early benthic phase mortality in mussels that settle on open surfaces. In contrast, cyprid mortality on bare surfaces was not significantly influenced by desiccation stress or any other weather-related abiotic factors. I concluded that the survival of newly settled mussels likely depends upon the presence of protective microhabitats created by filamentous and fucoid algae, whereas barnacles experience reduced survival through the early benthic phase in the presence of fucoid algae. Changes in survival of these algae due to climate change could therefore have extensive influence on mortality through the early benthic phase and may subsequently affect population and community structure.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 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) | 0,001 | 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 source (Gemma direct ou Codex distillé), 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 ».