Cuba to Yellowstone

by Bob Unnasch director of science

During the past several weeks I had the opportunity to take a break and travel some. At the end of May I traveled to the Archipiélago de los Jardines de la Reina, a cluster of islands off the southern coast of Cuba. Two weeks later I spent a few days in Yellowstone. 

While honestly, the main reason for my visit to the Caribbean was to catch large fish on flies, I was also excited to see the island’s biodiversity. Cuba is only 90 miles south of Florida and 140 miles east of the Yucatán. At times the Gulf of Mexico Loop Current sweeps past the Yucatán peninsula and turns due east brushing the northern coast of Cuba. Other times the current flows north through the Gulf of Mexico then south along the western coast of Florida before flowing east through the Straits of Florida. It seems like the ideal conveyor to carry critters to the island. I anticipated the fauna of Cuba to be an amazing collection of North and Central American critters. 

 

Going Fishing © Bob Unnasch

My trip to the Jardines involved flying into Havana and then driving ~300 miles to the small town of Júcaro. We then boarded a boat for a 60 mile trip to the islands. To my great disappointment I saw no mammals, nor any evidence of mammals. Similarly, I saw few bird species — even remarkably few individual birds. I was dumbfounded; my daydreams of a biologically diverse paradise, shattered. Maybe it was time to get my eyes checked.

Upon my return, I did a bit of research and discovered that it wasn’t my eyes. Cuba's native land mammals include two insectivores, one coney, and twelve rodents. Of these, five are extinct, including the coney, and five are critically endangered. By comparison, Yellowstone has 67 native mammals in the park, (Idaho has 107).

 

Cuban hutia © Bob Unnasch

Our visit to Yellowstone National Park was a typical driving tour over a few days with a couple of stops at the Conservancy’s Flat Ranch. We saw all the charismatic mega-fauna that make Yellowstone famous and lots of small and medium mammals. It was fun, as always, to see the abundance and diversity of the park, and to imagine what the Rocky Mountains were like a millennium ago.

During my drive home, I started to think about the contrast between Yellowstone and Cuba. What would Yellowstone, or Idaho, be like if we only had a handful of native mammals? It would certainly feel different... and empty. Conservation biologists have described many tropical forest parks as suffering from an “empty forest syndrome”. The forests still have their trees, but all the large mammals are gone; typically the result of market hunting.

 

Yellowstone bison © Alan W. Eckert

We are seeing dramatic changes in the Rocky Mountains. Warmer winters have released mountain pine beetles which are now decimating our forests. Our whitebark pines, which play a keystone role in these ecosystems is disappearing. Whitebark pine nuts are a crucial food resource for a diversity of animals, including the Clark’s nutcracker and grizzly bears. We don’t know what will happen when those pine nuts are no longer available. Climate change rather than market hunting may well be emptying our forests. While we cannot predict how the future will unfold, we can build on what we do know to hopefully minimize the impact of the changes we see coming.

Ecologists use the word niche as a catch-all term that means “all the biological, ecological, and physical constraints on a species’ range”. Physical constraints include climate, geology, soils, hydrology, etc.  In 2010, two TNC scientists, Mark Anderson and Charles Ferree proposed a unique strategy for biodiversity conservation in light of climate change. Rather than focus on the species, we should focus on maintaining those geophysical features that ultimately control species distributions. This idea has taken hold and the strategy is now called “Conserving Nature’s Stage”. Click here for more information.

 

Flat Ranch bluebird © Marilynne Manguba

TNC has embraced this idea and is now mapping the geophysical diversity (Nature’s Stage) across North America. We completed this assessment for the Pacific Northwest late last year, and are now identifying key areas for conservation. The Doris Duke Charitable Foundation recently granted The Nature Conservancy $6,000,000 for land conservation work within these areas.  I’m hopeful that by conserving the diverse ecological stage we’ll be able to ensure that the actors will always find a home.

Installing A New Dam - an update on the restoration at Silver Creek

Editor's note: The Kilpatrick Pond project is the largest enhancement project to take place at Silver Creek. The project is restoring the impounded section of the creek known as Kilpatrick Pond to address rising water temperatures and decades of sediment build up. Presently the pond contributes a significant amount of warm water into the system because of its large surface area. This affects over 15 miles of creek downstream. Every month we will post an update about the project on this blog.

We are nearing the end of the first phase of the restoration at Kilpatrick Pond. This month we completed dredging of the pond on the Purdy property, and began installing a new dam structure that is designed to allow for fish passage and the flow of cooler water under the dam. Recently water was diverted out of the pond to allow for the dam's installation. Fall is upon us and we are making steady progress. Stay tuned for more ...

Learn more about the project and how you can contribute at the Kilpatrick Pond Project webpage.

Looking upstream at The Nature Conservancy’s half of Kilpatrick Pond, following the downstream diversion of Silver Creek. Photo taken from the float tube access farthest downstream on Silver Creek Preserve, just above Kilpatrick Bridge. Photo © Rydell Welch/TNC.

Looking downstream from Kilpatrick Bridge, towards the Purdy’s (RR Ranch) half of Kilpatrick Pond.  Diverting Silver Creek through one of the Purdy’s irrigation canals exposed much of the ‘pond’ sediment for restoration work. Photo © Rydell Welch/TNC.

Silver Creek diverted through Albrethson Ditch, an irrigation canal on the Purdy’s property. Diverting Silver Creek at this point exposes most of the pond sediment and allows for the construction of a new irrigation dam. Photo © Rydell Welch/TNC.

The old dam used for irrigation on the Purdy’s property. The new dam is designed to allow fish passage and the flow of cooler water under the dam. Photo © Rydell Welch/TNC.

An overview of the Purdy’s half of Kilpatrick Pond, taken from the south side of Silver Creek. Silver Creek is visible along the northern side of the pond until it disappears into Albrethson Ditch. Photo © Rydell Welch/TNC.

Electro-fishing

Recalling his first fishing trip to Silver Creek, Jack Hemingway wrote "I suspected there was something going on that I simply didn't understand"--a sentiment familiar to many anglers.

Spring creeks like Silver Creek are complex ecosystems. Even a careful observer can only hope to catch an incomplete glimpse of what's really happening.

That's why monitoring and research are such an important part of the Silver Creek conservation program. Spring creeks are not well studied. But at Silver Creek, a substantial monitoring program supplies biologists with a more complete picture.

From birds to vegetation, from water temperatures to flow rates, monitoring programs regularly assess the state of the creek.Beginning in 1997, the U.S. Geological Survey (USGS) has monitored fish populations in Silver Creek every three years.

This year, USGS biologists, with assistance from the Idaho Department of Fish & Game and Conservancy interns and volunteers, are electro-shocking sections of the creek to conduct their survey. Electro-shocking sends an electric current through the water which stuns any nearby fish. Volunteers net the fish, which are then delivered to live wells.

Fish species are recorded, and each fish is then weighed and measured, before being carefully released back to the stream. Anglers and conservationists are always very interested to know the ratio of rainbow trout to brown trout. There has been some evidence that brown trout, a Eurasian species, have slowly been taking over as the dominant species.

During Monday's electro-shocking, biologists were surprised at the large number of healthy rainbow trout. But it's far too early to guess what the monitoring studies will find.Trout aren't the only focus of this study; biologists also record the presence of dace, sculpin and the other small fish species that often escape notice. USGS biologists are also recording large invertebrates as part of the monitoring survey.

These smaller species are an integral part of the Silver Creek ecosystem--and serve as indicators as far as water quality and the overall health of the creek.

The electro-shocking will continue through July. In early autumn, the Conservancy will receive the results of this year's monitoring. We'll post the information here, so check back for the most current information on Silver Creek's fish.