Showing posts with label natural history. Show all posts
Showing posts with label natural history. Show all posts

Sunday, May 19, 2013

Lizards of Laguna de Apoyo I: Conservation Science Interns at Work

gecko
The Central American Banded Gecko is very attractive, but its intricate pattern hides it well among leaf litter during the dry season. Photo by Laura Ruysseveldt.  
The tropical dry forest habitat of Laguna de Apoyo Nature Reserve dictates the kinds of animals found here. Both plants and animals must tolerate long months without rain, and in many areas, steeply inclined soils stripped of nutrients. Several species of lizards adapt well to the habitats found here, as conservation science interns Bryan Minne and Laura Ruysseveldt from Ghent University in Belgium found during their studies here.

Coleonyx mitratus
The Central American Banded Gecko, Coleonyx mitratus, is uncommon in Laguna de Apoyo Nature Reserve. Photo by Laura Ruysseveldt. 
Bryan and Laura spent a few months in Nicaragua, studying the geckos and other reptiles and amphibians of Laguna de Apoyo Nature Reserve. They turned up some solid information on gecko habitats, particularly regarding the recently introduced Asian house gecko, Hemidactylus frenatusand its impact on native gecko species.
herpetology
Field research on lizards and other herps usually includes a difficult process of identification. Photo by Laura Ruysseveldt.
Laura and Bryan also surveyed several habitats in the Laguna de Apoyo Nature Reserve, in search of each of the reptile and amphibian species that could be found here. They were the first to find the Central American Banded Gecko (Coleonyx mitratus), a charismatic little animal that tends to stay on the ground, rather than in trees. 

Asian house gecko
Asian house geckos (Hemidactylus frenatus) doing what they do best, which is among the reasons why they are now so abundant in Nicaragua, only a few decades after the first individuals arrived. Photo by Laura Ruysseveldt.
Bryan and Jeffrey review trees for study plots for gecko habitats in Laguna de Apoyo Nature Reserve, Nicaragua. Photo by Laura Ruysseveldt.
Field work included systematic reviews of habitats for geckos to determine how native species, particularly the Yellow-headed Gecko (Gonatodes albogularis) and the Yellow-bellied Gecko (Phyllodactylus tuberculosus) are responding to the invasion of the Asian House Gecko (Hemidactylus frenatus). Their project yielded some rigorous results, and they sweated a lot on long walks, but we are sure they are happy they came!
lizard Nicaragua
The Black-bellied Racerunner, Cnemidophorus deppei, is elusive and difficult  to photograph in the wild. Photo by Laura Ruysseveldt.

The Black Iguana, Ctenosaura similis, is an effective symbol for forest destruction in Nicaragua, as poachers often set forest fires to hunt them during the dry season. Photo by Laura Ruysseveldt.
We often ask ourselves how can we assure the protection of lizards and other wildlife in Nicaragua. By sponsoring conservation science internships for students such as Laura and Bryan, we are learning more about our herpetofauna, including what problems each species may be facing. For instance, while surveying the reptiles in our area, the staff at Estacion Biologica, along with Laura and Bryan, witnessed an attempt to capture a large Black Iguana (Ctenosaura similis). We stopped the hunters as they chased the animal through a ravine, and then reported the activity of these people to the park rangers, who responded within minutes to warn the people that hunting is illegal inside the Laguna de Apoyo Nature Reserve.

Sceloporus variabilis
The Rose-bellied Lizard, Sceloporus variabilis, is a close relative to several fence lizards found in the US and  Mesoamerica, and is abundant in rocky and dry areas. Photo by Laura Ruysseveldt.
Forest fires are often set to hunt iguanas and mammals. The fires destroy the habitat of and kill many smaller reptiles and other mammals, too. Laura and Bryan participated in extinguishing a forest fire that burned several hectares, just behind Estacion Biologica. Many animals live precariously in the forests where humans may abuse them in numerous ways.

Bryan examines a captured specimen before making a presentation on the reptiles of our area to the students of a local school. Photo by Laura Ruysseveldt.
Bryan and Laura returned to their studies in Belgium after completing a detailed, quantitative project as well as lots of time in the jungle, in search of lizards and other reptiles, and hopefully, we can utilize their knowledge to promote better stewardship of wild nature in Nicaragua.

lizards
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Friday, February 1, 2013

Bird Studies in Nicaragua

Anyone who has done some birdwatching in Nicaragua knows there are some great birds in this country. Observing birds by binoculars, however, still leaves many details unseen, as the photos below can demonstrate. We get a special opportunity to observe birds up close when mist netting. There are few tasks as gratifying as one involving the observation of a living, wild bird up close, especially our birds here.
birdwatching
Leslie patiently waits for this Blue-tailed Hummingbird (Amazilia cyanura) to fly away. Photo by Emily Williams.
By studying the birds in Laguna de Apoyo Nature Reserve, we are learning about bird communities in the Nicaraguan tropical dry forest habitat that dominates the terrestrial areas in this protected area. We are also learning, however, about land use, by determining which birds are found in different areas according to the human activities in each. Some birds can use only good forest habitats, and they may be getting forced out by forest degradation. We are hoping to demonstrate consistent patterns in bird populations according to land use and to the changing forest structure as a reforested area grows back into a relatively mature, natural forest.
A Yellow-throated Vireo (Vireo flavifrons) wants to make his disagreement known. Photo by Emily Williams.
At least 225 bird species have been documented in Laguna de Apoyo Nature Reserve, to date. Mist netting has helped us confirm several species which had been poorly documented by sightings. Many of the birds captured during mist netting, in appropriate season, are migratory birds, such as the Yellow-throated Vireo (Vireo flavifrons) and the Painted Bunting (Passerina ciris). Perhaps a quarter of the species found in Laguna de Apoyo Nature Reserve are migratory. Almost all migratory birds here nest further north and spend the non-breeding season here.
The male Painted Bunting (Passerina ciris) has dramatic coloration. Photo by Emily Williams.
Some migratory birds winter in mixed-sex flocks, and others segregate by sex and/or age in their southern, nonbreeding range. By counting the birds by sex and age in Laguna de Apoyo, we can help to determine migration patterns for these birds. Appropriate habitat is required for all migratory birds, especially the Red-Listed species such as the Painted Bunting (Near Threatened), and for all sexes and age classes.
Painted Bunting males are bright, whereas the females are drab. Photo by Emily Williams.
Even when the migratory birds have returned to their nesting ranges, the forests and shoreline of Laguna de Apoyo Nature Reserve continue to be conspicuously occupied with birds. The year-round resident birds, which will have become even more evident when the migratory birds have gone, may even reproduce during the stay of most migratory birds, during winter in the northern hemisphere.
The White-tipped Dove (Leptotila verreauxi) is among the larger species we catch commonly in mist netting activities in Laguna de Apoyo Nature Reserve. Photo by Emily Williams.
Not all birds use the same resources, of course. Many resident birds avoid areas with certain kinds of human impacts, such as the elimination of large, old trees, or the clearing of ground cover. The White-tipped Dove (Leptotila verreauxi) is an example. It is common in forest, but quite uncommon in yards, even where the yards have large, old trees. Another resident bird which is affected by human activity is the Northern Barred Woodcreeper (Lepidocolaptes sanctithomae). This species is common on the south side of Lake Apoyo, but absent from the north side, where greater human impacts are found on the vegetation structure. 
The Northern Barred Woodcreeper (Dendrocolaptes sanctithomae) is not well-documented west of Lake Nicaragua. Photo by Emily Williams.
Some of the local people brand us as tree-huggers, which is fine by us. We seem to get in the way of some people who have big plans for building inside the Laguna de Apoyo Nature Reserve, and they would rather that we go away. That gives us even more motivation to continue to work to save the forest and lake of this reserve. The greatest aspect of our bird studies is that of the people-those who are dedicated and even thrilled by the birds, and learn along the way. Our conservation science interns and volunteers bring life to our projects.
Nicaragua birdwatching
Work as a volunteer in wildlife monitoring is exhausting but worthwhile. Photo by Emily Williams.
The most thrilling of the birds we catch with mist nets must be the most demanding for our technicians, the hummingbirds. They are the smallest and, by far, the most delicate of the birds we catch. Hummingbirds keep very little "reserve" to fuel their activities, requiring that they feed and drink often. We give the hummingbirds water when they are captured, and we process them as quickly as possible to allow them to resume their activities with little interruption. Hummingbirds are usually docile in the hand, and sometimes won't fly away immediately when released.

Hummingbirds are not easy to see well when on the wing, so having one in the hand is particularly special. One can appreciate so many particular features of these birds when they are still and close.
With all the information we gather, we are trying to find which birds are segregated by land use and what can be done about it. We are looking for clear recommendations to promote the entire reserve as good forest and lakeshore for the birds.

birds Nicaragua
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Sunday, January 6, 2013

Bird research in Laguna de Apoyo Nature Reserve

Our volunteers have been busy in 2012 catching birds. These volunteers had a great time in all they did, but perhaps the most important aspect of their time at Estacion Biologica Laguna de Apoyo is the change they have left behind here. We are learning more about the birds with every activity, and we work closely with the Nicaraguan Ministry of the Environment and Natural Resources (MARENA) to train park guards, facilitate conservation work, and inform the public on nature issues in the Laguna de Apoyo Nature Reserve.

Here are some photographs taken by our volunteer, Vera Neumann. She has diligently worked on the study of birds several months, and will continue through most of 2013. This volunteer-driven project has yielded a lot of useful information on the birds and on the impacts of forest use in the Laguna de Apoyo Nature Reserve.
Steely-vented Hummingbird
The Steely-vented Hummingbird (Amazilia saucerrottei) looks very similar to the Blue-tailed Hummingbird (Amazilia cyanura). Here, the former has been captured during our mist netting study of birds in Laguna de Apoyo Nature Reserve. 
Each time we capture a bird, we identify it, measure its dimensions, check its age and sex, and then we clip a small piece of feather in a location that does not affect the bird. The bird is released into the wild within a half-hour of capture. We try to affect the life of the bird as little as possible and in return, gather information that can help to protect the wild animals found in Laguna de Apoyo Nature Reserve.
Blue-tailed Hummingbird
The Steely-vented Hummingbird (Amazilia saucerrottei) glows in Elmer's hand.
Hummingbirds are especially gratifying to capture and handle. They are especially delicate and sensitive to mishandling. We provide them with a drink when they are extracted from the mist net, because hummingbirds require frequent feeding and their liquid balance is more critical than with bigger birds. Not only do we enjoy them, we learn about them. For instance, Laguna de Apoyo Nature Reserve is home to two very similar species, the Steely-vented Hummingbird and the Blue-tailed Hummingbird. By capturing them, we can distinguish them and begin to determine how they live together and share resources.
The Worm-eating Warbler (Helmitheros vermivorum) is a migrant which is easily overlooked. We catch them occasionally, but we see them even more rarely. They tend to stay low, and their neutral colors and retiring behavior helps hide them well. 
Migratory birds are abundant in the forests of Laguna de Apoyo Nature Reserve from September through April. Some, such as the Yellow Warbler (Dendroica petechia) are common, others, such as the Worm-eating Warbler (Helmitheros vermivorum) are quite uncommon here. Mist netting is helping us to characterize what kinds of birds are found; we had not even sighted a Worm-eating Warbler before catching one.
Hylocharis eliciae
Hummingbirds such as this one (a Blue-throated Goldentail, Hylocharis eliciae) are docile once captured and held in the hand. 
Through our mist netting studies, we can learn when hummingbirds reproduce. Birds reveal their reproductive status in their feathers and other cues on their bodies. Some species form leks, assemblies of males, in which females come to shop around for their mates.
Myiodynastes luteiventris
The Sulphur-bellied Flycatcher (Myiodynastes luteiventris) is an unusual migratory bird; it nests in Nicaragua but winters in South America. 
Not all migratory birds in Nicaragua breed further north. Many species nest in Nicaragua, among them, the Sulphur-bellied Flycatcher (Myiodynaste luteiventris). Beginning in May, squeaks which suggest the sound a child's bathtub squeeze toy come from high in the forest, as the birds establish breeding territories, find mates, and reproduce. By the end of August, the birds will have bred, fledged their chicks, and departed for lands further south. 

Platyrhinchus cancrominus
This tiny bird is a Stub-tailed Spadebill (Platyrhinchus cancrominus). As a tyrant flycatcher, it has a wide bill and whiskers on the sides of the bill to help it catch insects in flight. This species is present in Laguna de Apoyo Nature Reserve, in the most forested areas along the southwestern shore of the lake.
Some surprises turn up in our bird research, using mist netting. Some birds that are characteristic of humid tropical forest, such as the Stub-tailed Spadebill, are present in Laguna de Apoyo Nature Reserve. This species is more common in the Caribbean side of Nicaragua, where the rains are more abundant and last most of the year. This bird species is missing from the more open areas of this reserve, presumably because the open forest tends to be drier.
birdwatching
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Wednesday, November 14, 2012

Rosebelly Lizard

wildlife
The Rosebelly Lizard, Sceloporus variabilis, is common in Laguna de Apoyo Nature Reserve. Photo by Senen Rivero.

Fourteen species of lizards are known to inhabit the tropical dry forest habitat in Laguna de Apoyo Nature Reserve. One of the more common species is the rosebelly lizard, Sceloporus variabilis, a member of the family Phrynosomatidae. Until recently, this species was classified in the family Iguanidae, along with the iguanas. The species is commonly seen rustling among leaves on the ground, scurrying over rocks or along fenceposts. The local name for this species in Nicaragua is terepota.

The rosebelly lizard is similar to the anoles, but is distinguished by the absence of a gular pouch, and the presence of a small post-femoral pouch, which can barely be noted in the photograph above. The species complex extends as far north as southern Texas. The variety found in Nicaragua, Sceloporus variabilis olloporus, is found from Guatemala into Costa Rica, and is considered by some researchers to be a distinct species. This species is among a group of species widely known as fence lizards.



We do not know how building and clearing of undergrowth for real estate, agriculture, and firewood extraction affects the rosebelly lizard populations in Laguna de Apoyo Nature Reserve. In fact, there is little information about the reproductive biology, diet, and population dynamics of this species, even less about the Central American taxon. This species is just one more example of the biodiversity of Nicaragua of which we know too little.
sceloporus variabilis
The longitudinal pattern of black-white compound spots on the back of the rosebelly lizard in Nicaragua is distinct from the pattern found on individuals in Mexico. Photo by Senen Rivero.
sceloporus variabilis
Distinctive markings help to identify the rosebelly lizard. Photo by Senen Rivero.
We have a lot to learn about the wildlife of the tropics, even in accessible places such as Laguna de Apoyo Nature Reserve. In fact, our understanding of the needs of wildlife in this place is especially important, because firewood cutting, agricultural expansion, and even housing construction is expanding every day. The loss of wildlife habitat could destroy this place as a protected area. FUNDECI/GAIA supports the local efforts to stop all illegal constructions of housing, which are often conducted in the area, almost always by non-Nicaraguans.

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Saturday, October 13, 2012

Woodcreepers

The birds of Nicaragua are diverse and, in many natural areas, abundant. Many of them are only found in forests, never in gardens or towns. Woodcreepers (Family Dendrocolaptidae) are examples of birds which do not prosper in areas with much human impact. Several woodcreeper species can be found in Laguna de Apoyo Nature Reserve, but only in areas where human influence is limited.
birds of Nicaragua
Ivory-billed Woodcreeper (Lepidocolaptes flavigaster) in Laguna de Apoyo Nature Reserve, Nicaragua. Photo by Pier-Oliver Beaudrault.
The woodcreepers crawl along the trunks of trees similarly to woodpeckers. All of them have a rufous-brown base color, some are quite similar. They use their tails for leverage against the tree trunks, and seek invertebrates on and within the bark.
birdwatching
The Ivory-billed Woodcreeper (Xiphorhynchus flavigaster). Photo by Pier-Oliver Beaudrault.
A rising and falling, almost hysterical laughing call may be heard when the Ivory-billed Woodcreeper (Xiphorhynchus flavigaster) is near. Its strong relatively straight bill distinguishes it from the Streak-headed Woodcreeper, also present here.
woodcreeper
The Ruddy Woodcreeper (Dendrocincla homochroa) climbing Spondias mombin. Photo by Pier-Oliver Beaudrault.
It is easier to identify on sight the Ruddy Woodcreeper (Dendrocincla homochroa), because it is uniquely uniform in color. It is not at all common, however, and we have seen it in Laguna de Apoyo Nature Reserve only a few times. It is known to follow army ant columns, preying upon animals that try to escape the path of the ants.
birdwatching
Ruddy Woodcreeper (Dendrocincla homochroa) in Laguna de Apoyo Nature Reserve, Nicaragua. Photo by Pier-Oliver Beaudrault.
The woodcreepers are all limited to certain parts of the forest in Laguna de Apoyo Nature Reserve. No woodcreepers are found in the northern section of the reserve, where Estacion Biologica is located. The forest is considerably older and trees are bigger to the south and the west of the lake, where woodcreepers are common.
woodcreeper
Ruddy Wooodcreeper (Dendrocincla homochroa) is entirely ruddy colored, in constrast to other woodcreepers in Nicaragua. Photo by Pier-Oliver Beaudrault.
Woodcreeper tails are utilized to sustain the birds and to provide leverage when digging in bark. Photo by Pier-Oliver Beaudrault.
We were more surprised to sight, and eventually to capture during mist netting, the Northern Barred Woodcreeper (Dendrocolaptes sanctithornae), a bird supposedly limited to the humid tropical forests of the Caribbean side of Nicaragua. Like the Ruddy Woodcreeper, it is expected at ant-swarms, where it may feed nearly exclusively. As a darker, less colorful bird, with sluggish movements, it might go unnoticed by the birdwatcher.
dendrocolaptes sanctithornae
The tail feathers of the Northern Barred Woodcreeper (Dendrocolaptes sanctithornae) have strong central shafts which aid in propping the bird when perched on vertical stems. Photo by Joe Taylor.
Woodcreepers make a special sighting for most birdwatchers, because they are not found in North America, and because they act differently from most other birds. Identification can be very difficult, however. We are especially happy when one ends up in our mist nets, although that means someone is going to get pecked a few times, as they are aggressive.
woodcreeper
The Northern Barred Woodcreeper caught during mist netting in Laguna de Apoyo Nature Reserve, Nicaragua. Photo by Joe Taylor.
Woodcreepers are part of the conservation story in Laguna de Apoyo Nature Reserve, too. We are hoping that soon woodcreepers will be sighted on the north side of Lake Apoyo, because the forest quality in that area has improved steadily in the past several years. Go birdwatching with us!
birdwatching
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Thursday, June 2, 2011

The Laguna de Apoyo Reading List I





Everyone needs a reading list. And if you are interested in Nicaragua, you will find many, many layers to the story of what makes this country the way it is. There is plenty to read to help you understand better the country "where lead floats and cork sinks". Here we present a reading list which, we think, provides a sound basis for the reality of Nicaragua. From fiction, to documentary, we cover several items available to read which introduce Nicaragua. This is the first of several parts, because, although Nicaragua is small and poor, it is rich in historical and literary heritage.

Please consider making any purchases of these books through our links. Every time you purchase a book using our link, we obtain credit that helps us obtain field guides, reference books, and other books that are vital to our work.

Ephraim George Squier served as an envoy from the US government to Nicaragua in the nineteenth century. His task was to document the geography, society and culture of Nicaragua, which he resumed in a fine book. It is a shame that this was out of print and that hardback copies are rare and very expensive. This book discusses the pressure of the Roman Catholic Church on the local people to destroy all precolombian statues, and his efforts to save some of them from destruction (see the San Francisco Convent in Granada for some of the statues he saved). His activities in the region are a prologue to the transoceanic canal, later constructed in Panama. He wrote sympathetically of Nicaragua, giving ample descriptions of the people and land in this travelogue.



Among the ineludable realities of Nicaragua is the conquest of Latin America by the Spanish and Portuguese, an event which transformed a continent forever. Eduardo Galeano documents the subjugation of an entire race as serfs in a feudal system imposed by the colonizers, which in turn subjugates generation after generation of descendants in despotism. We need not look to Europe and Asia to find police states, massacres, state-sponsored terrorism, proxy wars, famines, and fascism, because they are all contained in the history of Latin America, and retold in this book. Galeano once said of himself, "I'm a writer obsessed with remembering, with remembering the past of America above all and above all that of Latin America, intimate land condemned to amnesia."
Using historical documents, Galeano recreates centuries of history from the perspective of the oppressed, presenting the impacts of wars, colonizations, and policies decided in Europe and in the capitals of these countries on the disenfranchised. The current reality of Nicaragua is immersed in the common history of Latin America, a story whose perspective of oppression is told best by Galeano.
In their first encounter, Hugo Chavez gave a copy of this book to Barak Obama.

Thomas Belt was an English mining engineer who worked in Nicaragua in the nineteenth century. His travels through the countryside, from gold mine to gold mine, provided him with opportunities to pursue his passion-tropical biology. He documented the mutualistic intereactions between Pseudomyrmex ants and the Bullthorn acacia which provides the ants with shelter and food. His incisive descriptions of nature are used in tropical biology texts. His observations of human nature were equally acute, and are told in an engaging style meant for the general reader. Many of his anecdotes on the landscapes and rural people, though more than a century old, ring true today. He struggles with the procrastination endemic to the culture, hails the affection and hospitality abundant among his experiences, and provides the reader detailed landscapes of towns, villages and countryside, in many ways still valid today.

No discussion of Nicaragua can omit the insurrection against the Somoza dynasty and subsequent revolutionary period. Two monumental, successful hostage events occurred during the insurrection, both of which liberated Sandinista guerrilla fighters from Nicaraguan prisons and heightened the image of the revolutionary movement. Gioconda Belli fictionalizes a hostage-taking event, creating a fiction that embeds the issues of political, social and gender liberation in a thrilling story. A young, apolitical woman from the middle class becomes a hostage-taking revolutionary commando in a series of events that seem at once improbable and very convincing. The story gives an excellent insider's view of Nicaraguan middle class society from a woman's perspective.




Omar Cabezas did not come from a prestigious or wealthy family, but he joined the Sandinistas as a teen. He tells his story in a self-effacing, relaxed prose, using Nicaraguan street language, of the formation of a university student leader into a guerrilla fighter: indecision and decision, glory and boredom, illness and banal humor. A well-told story from a more proletarian point of view, in contrast to most who chronicled the period.







Blood of Brothers gives a well-documented, balanced account of events throughout the insurrection and the Sandinista period. Stephen Kinzer combines an authoritative first-hand account of important events with documentary evidence to make a very readable chronicle of the period, told with the precision of a journalist at his best. He portrays skillfully many perspectives inside a divided country during a time of war.



Claribel Alegria tells the chilling story of the only modern head of state to be assassinated in exile-Anastasio Somoza. Argentine revolutionaries taking refuge in Nicaragua learn of his presence in Paraguay and undertake a suicide mission-to kill Somoza in the most controlled police state in the western hemisphere. It would make a great thriller novel, but it is real. A ruthless dictator meets a violent end, told by a great writer who was herself a victim and refugee from the Somoza dictatorship of Nicaragua.


No history would be fairly told without considering all sides. Anastasio Somoza Debayle tells his own story of the last years of his administration, blaming principally Jimmy Carter for removing support for him and allowing the "communist" Sandinista revolutionaries to take power in Nicaragua upon his departure.




The Nicaraguan Revolution was in large measure a transformation of the role of women in the Latin American society. Margaret Randall chronicled the stories of women as participants in the Nicaraguan society in a series of ethnographic sketches, treating women at several levels of Nicaraguan society, in their own voices. Her first book on the subject, Sandino's Daughters, is juxtaposed with Sandino's Daughters Revisited, in which she considers the lives of the same women post-Sandinista period of the 1990's.

A picture is truly worth a thousand words, when the photographer is Susan Meiselas. In this collection of photos, she captures the violence of the insurrection, the cruelty of the National Guard, the absurdity of the ruling class during a bloody war, the horror and sometimes, bravery of common people in the face of tragedy. In her pictures is the collective memory of a nation living a terrible, hopeful, and fateful period.


Julio Cortazar was an Argentine writer who sympathized greatly with the Sandinista Revolution. His chronicle, Nicaraguan Sketches, defends the process of the 1980's in a series of sketches discussing a wide variety of topics.

reading
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