Harrowed sparrows and shrinking starlings

Posted by Sam Heggie-Gracie @SamHegGra

Birds are one of many taxa seen to be on the downslide globally, with 12% of all birds classified as threatened. Bird trends have been particularly well documented in Europe, and some of these studies have thrown up some interesting findings. In particular, it appears rarer birds are increasing in abundance, whilst the more common species are driving the brunt of the overall decline.

Spock’s famous adage “The needs of the many outweigh the needs of the few,” doesn’t normally apply in conservation, whereby common species are often overlooked in favour of protecting those that are rarer. It’s easy to take common species for granted. However, common species disproportionately influence the environment they live in as they form an especially integral part of the structure and function of their habitat. Commonality in ecology is (ironically) a rare trait, with only a few species lucky enough to have the right characteristics to multiply like nobody’s business and dominate an environment (think: humans). A decline of a once common species will be pretty bad news. In Europe, even the cherished, ever-present sparrows have taken a dive, as have starlings.

sparrowHouse sparrow (Image source: Fir0002/Flagstaffotos)

Some recent research has shown some of our own common birds such as tui may also be declining. Habitat destruction, invasive species and climate change pose threats to these birds, so it will be important to keep an eye on their populations.

By continuing to undertake informed bird-friendly actions (such as good bird feeding practices!), we can safeguard our inimitable native species from further loss. In terms of policy, a compact city as opposed to a sprawling one appears more favourable for bird communities, and this may be especially true for natives. Such city-scape planning alongside regular population monitoring may be increasingly required in order to mitigate biodiversity loss and assist both the many as well as the few.silvereyeSilvereye (Image source: Fir0002/Flagstaffotos)

Check out Josie’s endearing video on good feeding practices, and remember to keep a close eye on your cat this summer as baby birds begin to emerge!

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Sam Heggie-Gracie is an MSc student in the Centre for Biodiversity & Biosecurity, School of Biological Sciences, University of Auckland. He is investigating the drivers of bird composition in cities. He is supervised by Margaret Stanley and Cheryl Krull (AUT).

 

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