Image: Scott Camazine/Wikimedia Commons.
Home » The ultimate packed lunch?

The ultimate packed lunch?

Heterotrophy or growing your own algae? Image: Scott Camazine/Wikimedia Commons.
Image: Scott Camazine/Wikimedia Commons.

Heterotrophy is so time-consuming: find prey, stalk prey, catch prey, consume prey… Preying all of the day and all of the night in some cases. How much more straightforward if you could just synthesise your own food and avoid all of that rushing about. Well, this particular calorific conundrum was solved by plants many hundreds of millions of years ago. But some animals have also cottoned on to this idea of a ‘free lunch’. Arguably, the most spectacular example of such an alliance is that between heterotrophic polyps and autotrophic zooxanthellae in coral reefs. Another – but entirely unsuspected – symbiosis has recently been discovered between the Spotted Salamander (Ambystoma maculatum) and a green alga (Oophila amblystomatis), within the adult reproductive tracts of the former, by Ryan Kerney and colleagues (PNAS 108: 6497–6502, 2011). An association between the alga and eggs of amphibians – and not just the spotted salamander – has been known for some time where it been suggested that the autotroph supplies oxygen to an otherwise hypoxic egg mass (e.g. Pinder and Friet, Journal of Experimental Biology 197: 17–30, 1994] and may in return benefit from amphibian nitrogenous waste. But identification of algal cells within the amphibian’s tissues was unexpected. This ‘association’ – it is too early to say what sort of symbiosis it might be or if the salamander obtains food from the alga, but which is viewed as a unique relationship between a vertebrate and a eukaryotic alga – poses many questions relating to cell–cell recognition and possible exchange of metabolites or DNA. And, like other symbioses, this new one raises further questions concerning the role(s) of ‘helping hands’ in the course of evolution.

Nigel Chaffey

I am a Botanist and former Senior Lecturer in Botany at Bath Spa University (Bath, near Bristol, UK). As News Editor for the Annals of Botany I contributed the monthly Plant Cuttings column to that international plant science journal for almost 10 years. As a freelance plant science communicator I continue to share my Cuttingsesque items - and appraisals of books with a plant focus - with a plant-curious audience at Plant Cuttings [] (and formerly at Botany One []). In that guise my main goal is to inform (hopefully, in an educational, and entertaining way) others about plants and plant-people interactions, and thereby improve humankind's botanical literacy. I'm happy to be contacted to discuss potential writing - or talking - projects and opportunities.
[ORCID: 0000-0002-4231-9082]

1 comment

  • While I can understand the association with eggs, the association of algal cells with adult salamanders is extremely odd, especially for almost fossorial species such as A. maculatum which almost never expose themselves to light (outside of spawning time). This sort of possible symbiosis might make sense in a few amphibia such as bufonids which do occasionally sunbathe, but makes no sense to me in Ambystomids.

Read this in your language

The Week in Botany

On Monday mornings we send out a newsletter of the links that have been catching the attention of our readers on Twitter and beyond. You can sign up to receive it below.

@BotanyOne on Mastodon

Loading Mastodon feed...