Posts

Showing posts with the label Ecology

Researching Algae, the Unsung Heroes of Aquatic Food Webs

Image
by Luca Marazzi * Why is it important to study algae? To start with, algae produce ~ 50% of the oxygen on planet Earth, they are food for small and large animals that in turn are eaten by people, but they also recycle nutrients and absorb CO 2 from the air; by existing and doing their own thing, these microorganisms provide these so called ecosystem services to human beings (Fig. 1). Moreover, as algae reproduce fast and are often adapted to specific environmental conditions, understanding how many species of algae, and which ones, live where and why give us cues as to the health of aquatic ecosystems, such as rivers, lakes, and wetlands.  Fig. 1 . Simplified scheme of the role of algae in food webs (from my Ph.D.  Thesis ). * Dr.   Luca Marazzi   is a freshwater ecologist working in   Dr. Evelyn Gaiser’s research group   in the School of Environment, Arts and Society at Florida International University. His main int...

Diatom of the month – April 2016: Cocconeis placentula

Image
by Luca Marazzi* ‘Who’ is it and where does it live? This diatom is monoraphid, that is to say it has a raphe only on one valve, as shown in the figures. Monoraphid species are one of 9 major morphological types of diatoms - the other ones are: centric (like Cyclotella meneghiniana ) , araphid (e.g. Asterionella formosa , which forms star-shaped colonies !), eunotioid (e.g. the beautifully ornamented Eunotia diadema ), symmetrical biraphid (e.g. the slender Navicula lanceolata ), asymmetrical biraphid (e.g. Gomphonema parvulum ), epithemioid (e.g. Rhopalodia gibba , which hosts nitrogen-fixing bacteria as symbionts), nitzschioid (e.g. the organic pollution-loving Nitzschia palea ), and surirelloid (the big Surirella ovalis ) 1 . Like in many other cases, the taxonomy is far from settled though; following recent research, numerous specimens usually named C. placentula should be more accurately named Cocconeis lineata and C. euglypta 2 .         ...

The Wonderful World of Diatoms

Image
I admit that I ended that last post a bit unclear. But diatoms, it should be said, aren’t (or, rather, shouldn't be said since I shouldn't use double negatives. Ah, well.).

Okeechobee or Okoboji? An Everglades Student’s Corny Tale

Image
This post was written by Nick Schulte, a Master's student in Evelyn Gaiser's lab at Florida International University.  So where would you go to study how Everglades algae respond to increased nutrients from sea level rise? The Florida Everglades, right? That’s what I thought. But I went to Iowa.

Why do we still know so little about common species?

Image
This guest post was written by James Stroud, Ph. D. student in Dr.  K en Feeley's  lab at Florida International University.  He is a regular blogger on the Feeley lab blog  upwithclimate. ------------------------------------------------------------------------------------------------------------------------- South Florida is a wild place for lizards. And at the moment, as the region’s most abundant native lizard, life sucks for the American green anole Anolis carolinensis . In the recent past a wealth of invasions have occurred from exotic Caribbean Anolis leading to the establishment of up to 10 non-native species around the Miami area, annually creeping further outwards towards the Everglades. The effect of congenerics on American green anoles has been well studied; the presence of an ecologically similar competitor – such as the now widespread Cuban brown anole Anolis sagrei (Fig. 2) – has forced them higher up into the trees and off the g...

What's next?

I'm just going to go ahead and say it: graduate school is great (though  The Simpsons disagree ). We're given 2-9 years (depending on whether you're a masters or doctoral student and the scope of your research) to live in a cozy academic bubble surrounded by like-minded peers doing research on things we think are interesting and important. We teach, we write, we think, we analyze, and we get to explore new places and meet really smart people. We don't have tons of extra responsibilities like kids (usually) and onerous administrative crap, and we're given some room to fail every once in a while (the most important part of the scientific process). Sure graduate school can be frustrating, annoying, and just plain idiotic at times, but that's pretty much a definition for life. Let's not get bogged down in the mundane. But the question I've been asking myself recently is, what's next?

How to Hate Ecology and Still Write a Thesis

During my first year as a graduate student, a week didn't go by where someone didn't ask me "So what's your research question?"  I hated that question more than anything.  I had combed the literature, searching for research ideas, only to discover everything I was interested in had already been done a hundred times over.  All of the mysteries of the environment had been answered and there wasn't anything left to be studied.  "Why am I even here and why are any of us doing science," I frequently asked myself.   "Ecology is stupid.  Ecology is hard.  I hate Ecology!" were also common chants I shouted in my office (and by office, I mean the spare lab next door that was used for storage and sleeping quarters for homeless grad students).  Then, one day, it suddenly all made sense.  I realized I was being punished by my adviser, because he was punished by his adviser, and his adviser's adviser punished him, etc. etc....