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Resurrection of Dormant Daphnia magna: Protocol and Applications

Resurrection of Dormant Daphnia magna: Protocol and Applications

Published on: January 19, 2018

Temporal changes in abundance-occupancy relationships over 40 years.

Lisa L Manne^1,2, Richard R Veit^1,2

¹Biology Department College of Staten Island City University of New York Staten Island New York.

Ecology and Evolution

|February 5, 2020

Summary

Abundance-occupancy relationships vary for bird groups. Neotropical migrants show increasing trends, while permanent residents show declining trends, influenced by human impacts and differing species responses over 40 years.

Keywords:

abundance–occupancy avian ecology breeding bird survey geographic range macroecology migratory guild population monitoring temporal change

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Area of Science:

Ecology
Conservation Biology
Ornithology

Background:

Abundance-occupancy (A-O) relationships are key ecological indicators of population and community trends.
Monitoring A-O changes over time is crucial for assessing species conservation status.
Human impacts on habitats can influence species' abilities to respond, potentially altering A-O dynamics.

Purpose of the Study:

To investigate how A-O relationships differ among migratory bird groups (Neotropical migrants, short-distance migrants, permanent residents) in North America.
To assess changes in A-O relationships over a 40-year period (1969-2009).
To determine if differences in declining species proportions and rates of change in abundance and occupancy drive observed A-O trends.

Main Methods:

Assessed numbers of declining species across migratory groups from 1969-2009.
Analyzed changes in A-O relationships for Neotropical migrants, short-distance migrants, and permanent residents.
Compared rates of change in abundance and occupancy separately among the three groups.

Main Results:

Significant differences in declining species were found among migratory groups.
A-O relationships declined significantly for permanent residents and non-significantly for short-distance migrants.
A-O relationships increased significantly for Neotropical migrants over the 40-year period.
Occupancy consistently increased for Neotropical migrants compared to permanent residents, driving A-O changes.

Conclusions:

A-O relationships are not temporally invariant and vary significantly across different bird migratory strategies.
Human impacts on habitats, combined with species-specific response variations, likely cause the observed temporal divergence in A-O relationships.
This study highlights the dynamic nature of A-O relationships and their sensitivity to environmental changes and species traits over ecological timescales.