Fragments of Life

MabeesSalamander_web

When zookeepers discovered that flamingos need a large flock in order to breed, it led to all kinds of crazy approaches to fool the birds – mirrors, plastic yard ornaments, speakers playing bird-crowd sounds (now, zoos generally just keep more birds). I think of habitat loss and fragmentation like a flock of flamingos. There’s a certain amount required for the habitat to function properly. If the size is too small or divided, it will fail.

The Atlantic Longleaf Pine Ecosystem (a.k.a. pine barrens – a deceptive name considering the high amount of biodiversity) spanned over 35 million hectares (about the size of Germany) around the year 1500; today, only ~1 million hectares of pocket forests remain. (1)

Good news though! If habitat is restored, amphibians (including our friend, Mabee’s salamander), among many other species, come back too. (2)

 

  1. D.H. Van Lear et al. 2005. History and restoration of the longleaf pine-grassland
    ecosystem. Forest Ecology and Management 211:150–165
  2. J. C. Mitchell. 2016. Restored Wetlands in Mid-Atlantic Agricultural Landscapes Enhance Species Richness of Amphibian Assemblages. Journal of Fish and Wildlife Management. 7(2) 490-498

Bone-Eater of the Dark Depths

osedax_colorWeb_JMLandin

When a whale dies, its body often sinks to the bottom of the sea. From death comes life – an entire ecosystem blooms from the resource-rich remains.

Scavenger fish (sharks and hagfish), as well as crabs, shrimp, and octopuses, consume the flesh, leaving only a massive skeleton behind. Even the bones are devoured in this cold, dark place. Osedax worms, a.k.a. bone-eating or zombie worms, slowly dissolve and ingest the protein- and fat-rich bone. Very slowly… for up to a century. The worms grow root-like structures into the bone’s marrow. These “roots” contain symbiotic bacteria that help digest the nutrients.

Descriptions of bone-eating worms were first published just 15 years ago. Since then, more than a dozen species of bone-eating worms have been identified from every ocean. Originally, researchers thought that the worms evolved with whales but more fossil evidence indicates that Osedax were likely present on the bones of marine reptiles at least 50 million years earlier. (1)

The whale-fall ecosystem was recently captured on video (the fuzzy reddish-brown coating on the bones are large numbers of the worms).

  1. Danise, S. and N.D. Higgs. 2015. Bone-eating Osedax worms lived on Mesozoic marine reptile deadfalls. Royal Society Biology Letters. 11(4)

Pining for Carbon

Conifers_landin

The boreal forest, or taiga, extends across Canada and Russia. Conifers dominate this cold ecosystem. The evergreen needles allow the trees to photosynthesize all year.

While conifers grow well in the frigid taiga, they don’t decompose very quickly when a tree falls. In other habitats, trees that die release their carbon as they decay. The pines, firs, spruce, and larches of the taiga soak in carbon from the atmosphere, add that carbon to their mass, and hold it in their bodies even after they die. One study suggests that the boreal forest sequesters twice as much carbon as tropical forests and six times the amount held in temperate forests (1).

For now, the taiga is helping us combat climate change. As temperatures warm, though, stored carbon can break down and release into the atmosphere as carbon dioxide, exacerbating the issue. The more we limit carbon emissions now, the more the boreal forest can help us into the future.

  1. https://www.borealbirds.org/sites/default/files/pubs/report-execsummary.pdf

Playful Kittens

3kittens_Landin

Play. It’s well-documented in many mammals and birds. Fish have also been observed leaping over sticks and batting around balls.  Frogs play-wrestle and tadpoles ride bubbles. Turtles play tug-of-war (1). Some invertebrates even play. Octopuses, and possibly spiders and wasps, have shown play behaviors too (2).

Welcome to our new playful kittens, adopted from SAFE Haven.

  1. Burghardt, G.M. 2015. Play in fishes, frogs, and reptiles. Current Biology. 25(1) R9-10
  2. Zylinski, S. 2015. Fun and play in invertebrates. Current Biology. 25(1) R10-11

 

Homegrown Squash

squash_landin

These heirloom varieties of squash are the literal fruits of my springtime obsession with Cucurbits (the gourd family – almost 1000 species of zucchini, pumpkin, watermelon, cucumber, etc).

This obsession grew thanks to Dr. Lori Shapiro who knows the coolest facts about squash! For instance, before domestication, wild gourds contained bitter toxins. Only megafauna like mammoths could ingest and disperse the seeds of these protected fruits (1). In the Americas, early hunter-gatherers used dried gourds as floats for fishing nets and to hold food and water. They also used fresh wild gourds for the medicinal properties of the bitter compounds (2). The wild gourd (Cucurbita pepo) was the first plant domesticated in the Americas, and the first agriculturalists likely grew them for their nutritious seeds rather than the bitter flesh. Thanks, Lori!

  1. Kistler, L., L.A. Newson, T.M. Ryan, A.C. Clarke, B.D. Smith, G.H. Perry. 2015. Adaptive domestication in squashes and gourds. Proceedings of the National Academy of Sciences, 112 (49) 15107-15112.
  2. Hart, J.P., R.A. Daniels, C.J. Sheviak. 2004. Do Cucurbita pepo gourds float fishnets? American Antiquity. 69(1) 141-148.

 

Limes & Science Go Together

Landin_limes_web

In 1740, an English commodore led an ill-fated squadron of ships out to sea, prepared to circumnavigate the world (and attack some Spanish holdings along the way). Of over 1800 men starting the voyage, only 500 survived. The main killer was not war or weather, but  nutrition.

Just a few years after the flotilla returned, a naval doctor conducted one of the most famous experiments in the history of science. After a few months at sea, sailors on Dr. James Lind’s ship began exhibiting signs of scurvy. The doctor treated sick sailors with random supplements to their regular diet. Some shipmen received vinegar, or sea water, or barley water. They made no improvement. Sailors who were given citrus fruits, though, made quick and full recoveries.

Unfortunately, dogma and a small sample size caused many (including Dr. Lind) to underestimate the power of citrus. It wasn’t until the mid-1790s, as scurvy-free anecdotes and experiences grew, that ships rationed out citrus juice to prevent the disease. Enjoy some lemons, limes, or oranges in celebration of science!

Beech Bodies

beech

Take a walk in a winter forest and you can’t help but notice beech trees. Silky smooth bark and sand-colored dry leaves stick out like Christmas lights against a dull and gloomy background. While every other leaf drifted to the forest floor months ago, beech leaves hold tight like cat hair on a sweater.

It’s called marcescence – these leaves that just won’t drop – and it’s common in oak and beech (the trees are close relatives). But why keep the leaves? Are these trees just photosynthetic versions of hoarders?

One possible reason may be to protect that bud, the thin tapered structure often described as “cigar-shaped.” Inside the scaly covering are the beginnings of the new year’s growth. Hungry deer can ruin a tree’s plans for spring. But with beech trees, deer tend to get a mouthful of dry leaves whenever aiming for a yummy bud. (1)

What about attacks from smaller enemies? Insects seem to prefer infesting trees with leaves hanging on over winter.  R. Karban decided to yank all the leaves off a few dozen small oaks and compare infestation levels of a tree-noshing wasp. (2) His numbers indicate that wasps prefer leaf-hoarding trees three-to-one compared to his denuded ones.

I believe Nature is constantly sending messages of wisdom if we’ll just listen. In this case, perhaps she’s saying “every action has an upside and downside, but with diversity, there’s always hope for a better future.”

  1. Svendsen, Claus R. 2001. Effects of marcescent leaves on winter browsing by large herbivores in northern temperate deciduous forests. Alces 37(2): 475-482.
  2. Karban, R. 2007. Deciduous leaf drop reduces insect herbivory. Oecologia. 153: 81-88.