JulieCraves

Research: Birds and lizards as insect predators in shade coffee

Borkhataria, R. R., J. A. Collazo, and M. J. Groom.  2006.  Additive effects of vertebrate predators on insects in a Puerto Rican coffee plantation.  Ecological Applications 16:696-703.

The authors used an exclosure study to see if birds and lizards had an impact on the abundance of insects in a shade coffee plantation, in particular two that damage coffee (the coffee leafminer and flatid planthopper).  When birds or birds and lizards were excluded, the abundance of larger insects increased.  In particular, planthoppers increased greatly when birds were unable to prey upon them. The leafminers, which are serious pests of coffee and are small insects, increased if lizards were not able to prey on them.   

This study indicates that birds and lizards (which the senior author found more abundant in shade coffee than sun coffee in Puerto Rico, presented in her Masters’s thesis) may help control the numbers of some coffee pests in shade plantations. Another important finding is that neither birds nor lizards interfered with the numbers of other natural insect enemies of coffee pests, parasitoid wasps.

Review: Good Coffee Co.

Every month, I like to try out a new shade-grown coffee.  This month, it was from the Good Coffee Company of South Carolina, which sells only Rainforest Alliance certified coffee. Since their coffees are available in 8 oz. packages, I tried two: El Salvador and their Costa Rica/Brazil blend.  I wish more roasters would offer small packages like this for folks to try, especially online vendors.  I don’t like to buy several pounds of coffee if I might not like it, not to mention I can’t drink that much in a week and hate to evaluate stale coffee. But just buying one pound and paying shipping is pretty pricing.  The option of buying several small bags is really appealing to me.

I ordered these beans as dark roasts.  A peek at the beans when they arrived showed a lighter color than what I’m used to seeing in a “dark roast.”  Only a few beans with oils barely showing on the surface, and a flat, milk-chocolate brown color.  The roast description on the Good Coffee site is a close match to this…I should have read it first! I tried the El Salvador first, noted to be of mild acidity and medium body.  I thought it was really nice when prepared as a strong cup in an Aeropress.

The Costa Rica/Brazil blend was described as an “Experimental blend. This product is a blend of our 05-06 crop RA Costa Rican SHB and Brazil NY2 Screen 19 coffees with a dash of RA Guatemalan and Kenya AA for balance.”  The beans were roasted to an identical medium, not dark, roast like the El Salvador, but I actually liked it a little better, and it was especially good in the Aeropress.   Both of these coffees “aged” better than a dark roast, I must admit, whether cooking in the pot or sitting in a thermal mug.  Since I like strong coffees, I actually liked them better a little old.  They also made a fine blend with a darker roast.

Coffee growing in Africa

Since shade certification is not available for coffee grown outside of Latin America, it can be helpful to understand coffee cultivation practices in the Old World.  This can help consumers choose sustainable coffees.  Certified organic is a good choice where available, although in many African countries, it is grown organically by default because small farmers cannot afford chemicals and fertilizers (“passive organic”) and may not be certified.

The whole concept of “shade grown” and what it means to biodiversity is different in Africa (and other Old World countries). Many Eurasian breeding bird species winter in Africa, but the most species are not found in tropical forests, but scrub savannas north of the equator, areas that do not coincide well with coffee-growing regions.  Thus the issues are not quite the same as in Latin America, but generally the most biodiversity is preserved on small farms, in diverse mixed crop farms, and farms that do not use chemicals.  If anybody has further information on biodiversity issues in African coffee plantations, drop me a line at coffeehabitat AT gmail.com.

Coffee originated in Africa, and today Africa still produces some great high quality arabica (Coffea arabica) coffees.  Africa is also the source of a lot of cheap robustas (Coffea canephora), which is also the easier variety to grow in the sun.  Sun plantations are more likely to be monocultures, and by virtue of that harbor less biodiversity.

The following countries produce primarily or entirely robusta coffee. Coffees from these sources are likely to be of lower quality, or not grown in a sustainable manner.  I would avoid them: Angola, Benin, Central African Republic, Congo, Gabon, Ghana, Guinea, Equatorial Guinea,  Ivory Coast, Liberia, Nigeria, Sierra Leone, Togo, Uganda, Zaire.

The following countries grow Arabicas, or both varieties. Links provide more growing, historical, or quality information. A star (*) indicates the best bets in sustainable coffees.

*Burundi — Nearly all arabica. Most is grown in full shade, and most is organic, since farmers cannot afford chemicals.  Coffee is a major export crop for Burundi.  A specialty coffee marketed as Ngoma is traditionally grown and especially sought-after.  Bird info for Burundi.

Cameroon — Mostly (>80%) robusta.  Most arabicas grown in the west, northwest, and east at high altitudes. There are Important Bird Areas in these regions. Choose arabica coffee from Cameroon, which is grown in small mixed plots (shade) or harvested nearly wild, and without the use of chemicals.  Bird/birding info for Cameroon.

*EthiopiaNearly all coffee in Ethiopia is grown in shade, either as ”forest coffee,” nearly wild, or ”cottage coffee,”  interplanted with other crops without the use of chemicals.  Some is now being grown on plantations.

The two main growing regions are Harrar, the province east of the capital of Addis Ababa, and Yirgacheffe in southwestern Ethiopia (also known as Sidamo).  Both regions grow coffee on small plots using traditional methods, and there are Important Bird Areas in these regions. Bird/birding info for Ethiopia.

Kenya – Grows Arabica almost exclusively, but rarely grown in shade. While it may be that the growing areas are not along migratory routes, and shade trees are less important to birds there, monocultures of anything are generally not good for any type of wildlife, and replace native habitats. Large estates generally use a variety of herbicides, pesticides, fungicides, and fertilizers. Bird/birding info for Kenya.

Madagascar — Both arabica and robusta are grown. Interestingly, Madagascar has 55 endemic species of coffee, including a bean without caffeine.  This island is one of the richest areas of biodiversity on earth, and has been severely deforested, and the farming of coffee was a major reason.  Unless you can determine the specific origin and growing practices of a Madagascar coffee, I’d avoid it.  I’ll try to dig deeper into this situation.  Bird/birding info for Madagascar.

Malawi —Arabicas are grown in several regions.  Due to the steepness of the terrain, coffee in Malawi is usually grown on terraces, using organic mulches to prevent erosion, and usually without pesticides.  It is sometimes grown interplanted with bananas, but it is often in fairly sunny conditions, or under bananas.  Bird/birding info for Malawi.

*Rwanda – Only arabicas are grown.  After the genocide and political unrest, various organizations have been helping to repair the Rwandan coffee industry (see my review of One Thousand Hills here, with accompanying links). Rwandan coffee is generally grown in small mixed plots with little or no chemical inputs.  It is often grown on steep slopes.  Bird/birding info for Rwanda.

Tanzania Grows both arabica (70%) and robusta. When coffee is grown in shade, it is under banana trees. Most arabicas are grown in the north, near the Kenyan border, on the slopes of Mt. Kilimanjaro and Mt. Meru (they may be called Kilmanjaros, Moshis, or Arushas).  Coffees called Mbeyas or Pares are Arabicas grown in southern Tanzania, between the rift lakes of Lake Tanganyika and Lake Nyasa.  With snow caps on the mountains diminishing (global climate change is a factor), farmers are struggling with irrigation issues.  Quality has been declining, but some organizations are working at reviving Tanzania’s coffee industry. Full post on Tanzanian coffee here.  Bird/birding info for Tanzania.

Zambia — All arabica, of variable quality.  Some avoid buying Zambian (and Zimbabwean) coffee because proceeds have been known to end up fueling the bloodshed in the Congo. Bird/birding info for Zambia.

Zimbabwe — Mostly Arabicas, grown on medium to large farms, mainly in eastern Zimbabwe bordering Mozambique, in the Chipinge region. Some avoid buying Zimbabwean (and Zambian coffee because proceeds have been known to end up fueling the bloodshed in the Congo. Bird/birding info for Zimbabwe.

Extensive information on African birds can be found at the African Bird Club web site.

Who evaluates non-certified shade coffee? Part 2

In Part 1 of “Who evaluates non-certified shade coffee?” I pointed out that roasters, importers, and retailers of non-certified shade coffee have assorted means of “verifying” that coffee is shade-grown.  These are usually described as farm visits by roasters, importers, brokers, or independent evaluators.  I pointed out that there isn’t much evidence that these evaluators have experience in actually assessing biodiversity, from a scientific viewpoint.

Why is this important? Can people without a biology background make sound assessments of coffee plantations?

The point of encouraging shade management on farms is not just shade, but functioning ecosystems that are as close as is practical to intact forest.  Looking at a farm and seeing lots of birds and trees does not address ecosystem functioning or biodiversity, the real goals of the shade coffee movement.

Agricultural areas share some of the same biological characteristics of urban areas. They are simplified, homogenized “ecosystems” populated with suites of similar, adaptable organisms.  One might find the same number of species of birds (or trees, or ants, or mammals) in a suburban park and an intact forest, and numerically these two plots would have the same species richness or “biodiversity.”

But there is a huge difference in a park in which the bird species are Rock Pigeon, House Sparrow, European Starling, American Robin, and Northern Cardinal and one which has Scarlet Tanager, Acadian Flycatcher, Red-eyed Vireo, Ovenbird, and Black-and-white Warbler.  The latter group is a suite of forest specialists, which would occur at low abundance. In the first group, we have a suite of common generalists. An inexperienced observer might conclude since each plot has 5 species, they are “equal.” In fact, the  person might conclude that the first plot is “better” because of the large number of starlings and House Sparrows!

Biologists take into consideration more than numbers when defining biodiversity, including relative abundance (which takes rareness into account), genetic diversity, the diversity of habitat types within the landscape, and ecosystem health and functioning.

In order to accurately assess the value of a coffee plantation to biodiversity, if that is truly our goal, an evaluator, at a minimum, must be able to be able to identify many of the major tree and bird species of a region, as well as understand their roles in the local ecosystem (is this bird common or rare? does it represent a forest specialist or a generalist? does this tree provide fruit, pollen, or nesting sites?).

So, it’s not enough to recognize trees and birds.  One has to have some sort of idea of what to look for. It would be great if there were a group of independent biologists who were experienced with the differences in regional biodiversity who could go around to farms and assess the growing practices for their value to biodiversity.

Until that happens, consumers must rely on some background information to try to decide which coffees, advertised as shade grown but not certified, might be best for biodiversity.  This information can include:

  • Knowledge of regional growing practices.  Certain countries and regions grow mostly shade coffee.  I’ll be posting information on growing practices in various regions in the future.
  • Knowledge of which farms and cooperatives have been certified.  If these beans are used in blends with beans from non-certified sources, they cannot be labeled certified, as far as I know.  I’ll be posting lists of certified farms and coops, which may be listed as sources by roasters.
  • Knowledge of botanical varieties.  There are two main coffee species, known commonly as arabica and robusta, and robusta is usually grown in the sun.  But even among arabicas, there are varieties that are less sun-tolerant.  I’ll be posting about the characteristics of the botanical types, which are sometimes mentioned by growers.

Needless to say, I’d always recommend buying from roasters that have close relationships with growers; who favor small farms; whose selections are mainly organic (which are usually shade grown, at least to some degree); and who have made an effort to support sustainability via their business practices and associations.

Photo of a coffee farmer in Colombia by Ashley Aull, under a Creative Commons license.