Comportement du gastéropode du médiolittoral Littorina saxatilis face aux fluctuations météorologiques journalières

Authors: Fernandez Nieto, Guadalupe Daniela
Advisor: Johnson, Ladd ErikMcKindsey, Christopher W.
Abstract: Life on Earth has appeared and evolved in a physical environment that changes through time and space. Living beings are found in places that bring together all the environmental conditions that allow them to complete their life cycle. Environmental factors such as temperature and the presence of water affect the abundance and distribution of species around the Earth. There are also variations in the physical environment over time. Life on Earth experiences annual, seasonal and daily cycles and can experience environmental changes on an hourly scale. All spatial and temporal changes shape the physical environment and the ecosystems that develop there. In the intertidal environment, organisms undergo changes due to tidal action. The movement of water caused by tides exposes the organisms living in it for a period of time. These organisms, mainly algae and invertebrates, have physiological or behavioral adaptations that allow them to survive aerial conditions. Mobile invertebrates often exhibit behavioral changes that allow them to find less stressful places to take refuge during the low tide. This study investigated the behavior of an intertidal gastropod, Littorina saxatilis, which is widely distributed in temperate environments. In the littoral zone of the St. Lawrence Maritime Estuary, this gastropod is often found inside cracks in the rock surface and forages outward from these refuges to graze on ephemeral algae. We observed the use of refuges under different weather conditions and conducted a field manipulation experiment to better understand the effect of different environmental factors affecting this behavior. The herbivorous gastropods of the intertidal are an important component of these ecosystems that affect local biodiversity. By better understanding their behavior responses to environmental changes, we can better understand this ecosystem and the changes that it is experiencing.
Document Type: Mémoire de maîtrise
Issue Date: 2019
Open Access Date: 14 December 2019
Grantor: Université Laval
Collection:Thèses et mémoires

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