Marine biological shifts and climate

Area of Science:

• Marine ecology
• Climate change biology
• Zooplankton dynamics

Background:

• Marine ecosystems exhibit phenological, biogeographic, and community shifts due to climate change.
• The underlying causes of these biological changes are not well understood, despite significant impacts on ecosystem functioning and services.

Purpose of the Study:

• To demonstrate that species and community responses to climate change are deterministic at certain scales.
• To propose a theory based on ecological niche concepts to explain observed biological shifts.
• To enable testable predictions and improve projections of future climate change impacts.

Main Methods:

• Developing a theory based on the ecological niche to link phenological, biogeographic, and community shifts.
• Applying the theory to explain shifts in the zooplankton Calanus finmarchicus in the North Atlantic.
• Analyzing long-term (1958-2009) copepod community shifts in the North Sea.

Main Results:

• The proposed ecological niche theory explains approximately 70% of phenological and biogeographic shifts for Calanus finmarchicus.
• The theory accounts for approximately 56% of long-term copepod community shifts observed in the North Sea.
• Demonstrated deterministic patterns in biological responses to climate change at emergent spatio-temporal scales.

Conclusions:

• A significant portion of marine species' responses to climate change is deterministic.
• Ecological niche theory provides a robust framework for understanding and predicting climate-driven biological shifts.
• Accurate projections of future ecosystem changes are achievable through understanding these deterministic responses.