Sunday, 26 February 2012

Protected?


Coastal First Nations http://www.coastalfirstnations.ca/
Humane Society International/Canada http://www.hsi.org/world/canada/
The Spirit Bear Youth Coalition. http://www.spiritbearyouth.org/

The Great Bear Rainforest (together with the Haida Gwaii) holds the largest area of intact coastal temperate rainforest in the world. This ecosystem has become so rare, it now covers less than 1% of the planet’s entire land mass. It supports many threatened and unique species, such as wolves, grizzly bears, and black bears. It is also home to the extraordinary spirit bear, which as Krista explained, is a genetically distinct subspecies of the black bear with white fur due to a recessive gene. However, this habitat and the species living there are facing many threats…

Only 50% of the Great Bear Rainforest is protected from logging, and the BC government says they need until 2014 to increase that to 70%. Of course, that is after the election, so who knows who will be in power then.





The government also allows trophy hunting of black bears and grizzly bears within 98% of the spirit bear’s range, including protected areas. People come from all over in search of the biggest kill. Although it is illegal to hunt the spirit bear, the black bears that are carriers of the white fur gene are fair game. When the proper gene pool is intact, 1 out of every 10 black bears are spirit bears. If these bears were to become endangered, it would be extremely difficult to increase their numbers through captive breeding, due to this fact. That is why it is exceptionally important to conserve the delicate ecological balance that has allowed the spirit bears to survive for thousands of years. This senseless slaughter threatens the genetic diversity of these unique populations. The spirit bear is the icon of our province. It is so rare to begin with, we should be doing everything we can to preserve this celebrated animal. How are we supposed to save the spirit bear, if there are no black bears to carry the gene in the first place?
Even though the grizzly bear is not as renowned as the spirit bear, it is still an important part of BC. This is one of the few places in North America where the grizzly bear has not been extirpated, but it is still a threatened species. Yet, approximately 300 grizzly bears are killed per year in BC by trophy hunters.

Countless organizations have made it their mission to protect the Great Bear Rainforest, save the spirit bear, and end trophy hunting in this area. Pacific Wild, The Spirit Bear Youth Coalition, Humane Society International/Canada, Coastal First Nations, and Sierra Club BC (to name a few) have been educating the public and fighting to increase the protection of the Great Bear Rainforest. People would rather watch these beautiful creatures in their natural environment, instead of see them hung on walls as trophies. To learn more, please visit the above websites to see what they are doing to support this cause.

Word Count: 492

These videos also summarize the issues quite well (but I am warning, you will feel depressed after).
Part 2: http://www.youtube.com/v/DOPWZ8gOAO8?version=3&f=playlists&app=youtube_gdata

Wednesday, 8 February 2012

A "Sea"ccess!


Chaloupka, M., K.A. Bjorndal, G.H. Balazs, A.B. Bolten, L.M. Ehrhart, C.J. Limpus, H. Suganuma, S. Troeng, and M. Yamaguchi. 2008. Encouraging outlook for recovery of a once severaly exploited marine megaherbivore. Global Ecology and Biogeography 17: 297–304. http://accstr.ufl.edu/publications/Chaloupka_etal_GEB_2008.pdf

Mortimer, J.A., R.G. von Brandis, A. Liljevik, R. Chapman, and J. Collie. 2011. Fall and rise of nesting green turtles (Chelonia mydas) at Aldabra Atoll, Seychelles: Positive response to four decades of protection (1968–2008). Chelonian Conservation and Biology 10: 165–176. http://www.swetswise.com.ezproxy.tru.ca/FullTextProxy/swproxy?url=http%3A%2F%2Fwww.chelonianjournals.org%2Fdoi%2Fpdf%2F10.2744%252FCCB-0872.1&ts=1328759412200&cs=3094114707&userName=5786541.ipdirect&emCondId=5786541&articleID=163757158&yevoID=3454990&titleID=39926&referer=4&remoteAddr=192.146.156.172&hostType=PRO&swsSessionId=dgs4vW4-33ycBXdp2TmMhw__.pasc1

Standora, E.A., and J. Spotila. 1985. Temperature dependent sex determination in sea turtles. Copeia 3: 711-722. http://www.jstor.org/pss/1444765

Troeng, S., and E. Rankin. 2004. Long term conservation efforts contribute to positive green turtle Chelonia mydas nesting trend at Tortuguero, Costa Rica. Biological Conservation 121: 111–116. http://www.conserveturtles.org/pdf/scientific/Troeng_Rankin_2005BiologicalConservation.pdf

After a somewhat depressing start to the semester of conservation biology, we are in need of a few success stories to lighten our mood. A prime example of animals that are significantly benefiting from our conservation efforts are the sea turtles (I will focus on the green turtle, Chelonia mydas). Sadly, for the last 141 years, green turtle populations have declined by 37-61%; and as a result, the species is listed as endangered by the IUCN (Troeng et al., 2004). There have been many causes contributing to their decline: (1) exploitation by humans for eggs and meat; (2) conflicts with commercial fishing; and (3) coastal development (Troeng et al., 2004; Chaloupka et al., 2008). Sea turtles are especially sensitive to coastal development, as they are very specific as to what beaches they will nest on, and they tend to return to the same beach year after year. They also have temperature dependent sex determination, where lower incubation temperatures for the eggs result in males, and higher temperatures produce females; therefore, buildings along the coast provide shade that could drastically alter the normal offspring sex ratios of the sea turtles (Standora and Spotila, 1985). The loss of green turtles is of particular concern because they contribute greatly to the health of seagrass and coral reef ecosystems (Chaloupka et al., 2008). In response to these threats, countless sea turtle conservation organizations have been established to try to save these beautiful creatures from extinction.


Monitoring and conservation of the green turtle population began in 1955 (Troeng et al., 2004); yet, sea turtles are a species with late maturity and low population growth rates, so it can take decades to see results (Troeng et al., 2004; Chaloupka et al., 2008).  Multiple studies have shown significant increases in nesting in several different populations over their study periods: 417% increase in Tortuguero, Costa Rica over 32 years (Troeng et al., 2004); 500-800% increase in Aldabra Atoll, Seychelles over 40 years (Mortimer et al., 2011); and up to a 14% increase per year in Florida over 25 years (Chaloupka et al., 2008). Nonetheless, other populations have still been seriously depleted, and numbers for all populations are still below historical abundance levels (Chaloupka et al., 2008). However, these trends reveal the positive effects that worldwide conservation efforts have had on the recuperation of the endangered green turtle populations. Although, there is still a long way to go, the outlook for green sea turtles looks promising!
Words: 407