Cosiguina Reserve
The dominating feature of the Cosiguina Reserve is the volcano itself. It was once the tallest volcano in Central America, estimated at more than 3000 meters tall (nearly 1000 feet). On January 20, 1835, Cosguina erupted and Nicaragua first appeared in the Guinness Book of Records for this, the third most potent explosion in all of America. It is considered to be the most violent eruption in the Americans since colonization. The sound wave reverberated its way to Colombia, Jamaica and Mexico, while it left Nicaragua, El Salvador and Honduras in stiflingly hot darkness for days. It created the Islets of Cosiguina, which serve as reminders of the incident, along with the jagged remains of the volcano, now less than half its original stature. There is a 2000 meter in diameter, rainwater filled crater lake at the top, which remains a rich blue-green hue due to continuing volcanic activity.
The reserve, declared in 1983, wraps around the remains of the volcanic cone and is a rare, dry tropical forest. This special habitat is home to Nine Banded Armadillos, Three-Toed Sloths, big cats (Jaguars, Mountain Lions, Pumas, Tiger Cats, Ocelots), Coatis (Ring-Tailed, White-Nosed), Spider Monkeys, Vampire Bats, Eastern Cottontails, Whitetail Deer, Weasels, Pacas and Squirrels. Reptiles also abound and Iguanas (Black, Green), Whiptails (Barred, Deppe’s), American Crocodiles, Snakes (Rat Snake, Boa Constrictor), Brown Caimans and Mudpuddle Frogs can be found here.
However this reserve is truly a bird sanctuary and is home to one of the continent’s last sustainable populations of Scarlet Macaws. These endangered huge, red parrots are stunningly beautiful and rare to find in the wild anywhere. They are social birds and are most commonly seen in groups, flying or perched in the tops of the tall deciduous trees in which they live. Additionally, the Cosiguina reserve is one of the last refuges in Pacific Nicaragua for two highly endangered species, the Great Curassow and the Crested Guan. These birds are very rare and almost extinct in the Pacific region.
Other species found in the Cosiguina Reserve are listed below:
- Herons (Little Blue, Tiger, Green)
- Kingbirds (Eastern, Western, Tropical)
- Vultures (Black, Turkey)
- Hawks (Roadside, Gray, Short-Tailed, Red-Tailed, Broad-Winged, Harris’)
- Doves (White-Winged, Ruddy Ground, Mourning)
- Parakeets (Orange-Chinned, Orange-Fronted, Green)
- Owls (Nocturnal Barn, Pacific Screech, Spectacled,)
- Wrens (Rufous-Naped, Stripe-Breasted)
- Orioles (Orange, Altamira)
- Ducks (Long-Legged Tree, Black-Bellied Whistling)
- Egrets (Great, Cattle)
- Parrots (Yellow-Crowned, White-Fronted)
- Motmots (Blue-Crowned, Tody)
- Blackbirds (Red-Winged, Common)
Other Species of Interest: Spotted Sandpipers, Lesser Ground Cuckoos, Cinnamon Hummingbirds, Golden-Fronted Woodpeckers, Scissor-Tailed Flycatchers, Barn Swallows, Yellow Warblers, Blue-Gray Tanagers, Great Antshrikes, Laughing Gulls, Brown Pelicans, Thicket Tinamous, Wood Storks, Laughing Falcons, American Kestrels, Spot-Bellied Bobwhites, Red-Billed Pigeons, Green-Breasted Mangos, Citreoline Trogons, Ringed Kingfishers, Golden-Fronted Woodpeckers, Long-Tailed Manikins, Great Kiskadees, Great-Tailed Grackles, Jaribu Storks and Pinnated Bitterns.
Gulf of Fonseca
- Fonseca Bay was discovered in 1522 by Gil Gonzalez de Avila, and named after his patron, Archbishop Juan Fonseca.
- Shared by three nations, each represented by a volcano: Nicaragua (Volcan Coseguina), El Salvador (Volcan Conchagua) and Honduras (Volcan Amapala)
- Covers approximately 3,200 km² and has a 261 km coastline, 47 of which are in Nicaragua
- The gulf is part of the ‘Pacific Central American Coastal Large Marine Ecosystem’ (LME) which extends along the Pacific Coast of Central America, from Cabo Corrientes in Mexico to the equator.
- The extensive mangrove wetlands which border the Gulf of Fonseca are the largest remaining mangrove stand in the Americas.
- Red mangrove is the most common species, occupying mostly the areas permanently inundated by the tides near the border of the mangrove stand closest to the sea.
- Black mangrove is the second most abundant species and is found around the rivers.
- White mangrove is the third most dominant and then botoncillo. They are both found further inland, in areas less frequently inundated by the tide.
- The dominance of one species over another correlates with the frequency of inundations, water quality, and levels of salinity.
Humpback Whales
Scientific Name: Megaptera novaeangliae
- Life expectancy: 45-50 years
Endangered Status:
- ESA Endangered (Under the Environmental Species Act of 1973) – A species is considered endangered if it is in danger of extinction throughout all or a significant portion of its range.
- Estimated population: 10,000 – 15,000 Humpbacks in the world
Description:
- Females are larger than males and reach up to 60 feet in length. Males are on average 52 feet long.
- They weigh 25-50 tons
- The four-chambered heart of the average humpback whale weighs about 430 pounds or about as much as three adult human beings.
Coloration:
- Primarily dark blue-black, with varying amounts of white on their belly and pectoral fins.
- The pattern and coloration of a whale’s fluke (triangular section of a whale’s tail) is like a human fingerprint and is the best way to identify individual whales
- There is a distinct indentation in between the two flukes and as the whale dives, it arches its back (hence the name ‘humpback’), leaving the flukes clearly visible above the water.
- Conspicuous pectoral fins (side flippers), which can be up to 15 feet in length. These huge fins provide maneuverability for both forward and backward moving.
- Characteristically knobby heads because they are covered in barnacles and raised lumps called tubercles, each with a bristle.
- They have two blowholes on the back and the spout of water they excrete can appear bushy.
- Humpbacks breathe air at the surface through these two blowholes.
- They spout (breathe) 1-2 times per minute while at rest and 4-8 times per minute after a deep dive.
- Their blow is a double stream of spray that rises 10-13 feet (3.1-4 meters) above the surface of the water.
Behavior:
- They are known for the mysterious singing of solitary males (some say it is part of a male’s courtship of a female whale)
- The songs are occasionally similar within populations, each whale’s song evolves from season to season
- They only sing complex songs in warm water (perhaps for mating purposes) and in colder water, their songs are rougher – scrapes and groans (perhaps used to locate krill and plankton)
- Their songs have the largest range of frequencies used by any whale (ranging from 20 – 9,000 Hertz)
- They are the most acrobatic of whales and are often seen leaping, breaching (aka lunging or cresting) , spyhopping (when they stick their head out of the water for up to 30 seconds to take a look around) or lob-tailing (slapping the water with their flippers or flukes).
- Humpbacks perform a breach by swimming very quickly just under the surface (parallel to the surface) and then suddenly jerk upwards at full speed.
- When breaching, the whale clears the water at an angle of about 30° to the horizon and around 90% of the body clears the water before the whale turns to land on its back or side
- To achieve 90% clearance, the whale needs to swim at least 29 km/hour.
- The longest sustained series of breaches by a whale was a Humpback who completed 130 leaps in less than 90 minutes
- There are various suggestions about why whales lob-tail:
- Non-vocal communication
- Sign of aggression
- Hunting technique (the loud slap frightens the fish into tight schools, which makes them an easier target on which to feed)
- They have a unique hunting technique utilizing what is called a “bubble net”.
- The whales essentially herd their prey into clusters and use a “bubble net” to trap larger numbers more effectively.
- The hunting members of a pod form a circle 10-100 feet (3.1-31 meters) across and about 50 feet (15 meters) under the water and emit a continuous stream of air
- The wall of bubble which forms will trap the krill, plankton and small fish in the center and form them to slowly rise to the surface in a concentrated mass
- The whales then swim in a cylindrical pattern towards the surface through their net of bubbles and gorge on their prey trapped within this confined space.
Diet:
- They eat tiny crustaceans (krill), plankton and small fish
- They are baleen whales, which means that they filter feed.
- They have large, sieve-like plates of baleen (made of a material similar to human hair or nails, which regrows as it gets worn down by the whale’s tongue) hanging down inside their mouths, which filters the planktonic organisms [aquatic organisms that drift with water movements; may be either phytoplankton (plants), or zooplankton (animals)] that they eat
- The average whale has 330 pairs of these dark gray baleen plates. Each plate is 25 inches long (0.6 meters) and 13.5 inches (34 cm) wide.
- They open their mouths widely and the 12-36 throat grooves on the underside of their mouth expand, enabling them to take in large quantities of water and with it, the fish and plankton
- The water, full of fish and plankton, enters the whale’s mouth through a gap in the front baleen plates
- The fish and plankton gets caught on the baleen plates and the water gets filtered out the sides of the whale’s mouth
- One whale can eat up to 3,000 pounds of food per day
Migration:
- A Humpback’s annual migration takes them thousands of kilometers between their summer feeding grounds in polar waters and their winter breeding grounds in the tropics
- They mate and calve in tropical waters during the winter and then travel to cold polar waters during the summer to feed.
- Humpbacks migrate 3-9 mph (4.8-14 kph) and have incredible endurance.
- They swim over 3,100 miles (5000 km) during each seasonal migration, with little to no rest along the way
- During migrations, they cover over 1,000 miles per month
- There are 3 separate populations of humpbacks – those living in the North Pacific Ocean, those in the North Atlantic Ocean, and those in the oceans of the Southern Hemisphere.
- Whales feeding south of Cape Horn make the longest known migration to their winter breeding grounds in the warm waters of Costa Rica
- Summer Months:
o Whales spend summer months in high latitude , highly productive locations (The Gulf of Alaska in the Pacific and the Gulf of Maine in the Atlantic)
o They spend the majority of their time building up fat stores (blubber), which they will live off of in the winter months. The calves will feed on their mother’s rich milk.
- Winter Months:
- Whales live off of their blubber stores and while traveling and breeding during the winter months, whales eat significantly less or not at all
- Calves are born after a 10-12 month gestation period and are often seen with their mothers in the winter breeding grounds
- The calves will accompany their mothers on the return migration to their polar summer feeding grounds
- Studies have consistently shown that individual whales return to the same feeding and breeding grounds every year
Threats:
- Humpbacks have historically been a major target in the whaling industry because of their coastal migration routes
- It has been estimated that over 100,000 Humpbacks were slaughtered in the southern hemisphere alone between 1900-1940.
- Although they are protected from whaling today, they are very vulnerable to changes in their marine ecosystem
- Pollution is a large threat because it so greatly affects the fish stock as well as the availability of planktonic organisms on which they depend
- Climate change will greatly affect them as they depend on the primary productivity (food) available along their extremely long migrations
- Increased water temperature, altered wind patterns will have hugely detrimental effects on their food sources and thus, the whales
Conservation
- Humpbacks received full protection in 1966 and have since been a species of interest in the public eye
- Whale watching tours are popular throughout the world from Alaska to Hawaii, Japan, New Zealand and Central America
- The Gulf of Fonseca is their safe haven for breeding and provides great opportunities for us to see whales up and down the coast near the gulf
- They are the most studied species of all the large whales, but there is still a lot of mystery surrounding certain aspects of their behaviour and population dynamics
- The exact reason for their singing, why they lob-tail etc.
- We need to protect these animals so that these mysteries can be uncovered
This whale watching season has been a true success as on every trip we encountered whales. Our last trip was on the 15th of March 2011 and was truly incredible as a mother and calf swam straight up to the boat and hung out with us for over an hour.
We are excited about the 2012 whale watching season!
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