Composite forces shape population dynamics of copepod crustaceans.

Area of Science:

• Ecology
• Aquatic Biology
• Population Dynamics

Background:

• Understanding species abundance and distribution is a key ecological challenge.
• Crustacea, especially those with complex life cycles, often defy traditional demographic analyses.
• Biotic and abiotic factors influencing population size are poorly understood for many organisms.

Purpose of the Study:

• To evaluate models of factors controlling the abundance of two copepod crustaceans in a tropical floodplain lake.
• To identify key biotic and abiotic drivers of copepod population dynamics.
• To investigate stage-specific influences on abundance and population growth rates.

Main Methods:

• Utilized likelihood techniques and information theory to assess multiple ecological models.
• Collected quantitative zooplankton samples bi-daily over six months in a Venezuelan floodplain lake.
• Constructed stage-structured models incorporating six biotic and abiotic covariates.

Main Results:

• Multiple environmental forces influenced the abundance of specific copepod life stages.
• Identified differing factors affecting species and distinct stages within species.
• Biotic processes, including density dependence, exerted the most significant effects on copepod population dynamics.

Conclusions:

• Biotic interactions play a crucial role in regulating copepod populations in tropical aquatic ecosystems.
• Density dependence significantly affects the survival of Oithona amazonica copepodites.
• Population growth rate of Diaptomus negrensis is strongly influenced by density dependence.