User talk:JacobMwiki

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Hello, JacobMwiki, and welcome to Wikipedia! My name is Ian and I work with the Wiki Education Foundation; I help support students who are editing as part of a class assignment.

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If you have any questions, please don't hesitate to contact me on my talk page. Ian (Wiki Ed) (talk) 19:47, 7 March 2016 (UTC)

Daphnia Lumhotlzi Review

The page was created in 2011, and was edited by a handful of people over several days. Since then, there have only been a couple of further revisions, with the last occurring in 2014.

The talk page has no conversations, other than a banner saying this article is part of "WikiProject Arthropods"

The article generally seems to be of good quality, if somewhat ill-structured and narrow. There are a significant number of reputable sources attached to the factual claims and there are no signs of bias. What is written is written clearly and in an encyclopedia format. The poor structure comment derives from the fact that many of the species characteristics seem to be just be shoved under the "Ecology" heading, and they could be easily broken up farther. The narrowness of the article refers to the fact that most of the article information relates to D. lumholtzi's status as an invasive species, but this could simply be due to a limited amount of information being available on this species relating to other topics.

As said before, I would like to break up the "Ecology" section into more suitable categories. I also think that all of the invasive species-related information should be organized under a single header, although then it will even more obviously dominate the article. I'd also like to see more information added about D. lumholtzi in its native habitat, although again this depends on data available. JacobMwiki (talk) 15:40, 11 March 2016 (UTC)

Hi Jacob! I briefly skimmed the article and it looks like there's definitely room for editing, especially regarding physiology.BBres96 (talk) 15:53, 11 March 2016 (UTC)

Hi Jacob, thanks for a thorough evaluation of the article on Daphnia lumholtzi. If this is the one you would like to contribute to for your Wiki work this semester, please indicate this on my talk page and I will assign it to you. Rico.schultz (talk) 18:40, 18 March 2016 (UTC)

I found the bibliography on the article in the talk page, thanks for letting me know you did it. You need to change the first citation: it's the International (not Internal) Journal of Limnology.Rico.schultz (talk) 12:27, 31 March 2016 (UTC)

Incidentally, nice work on the endotherm article also!Rico.schultz (talk) 12:29, 31 March 2016 (UTC)

Project Bibliography

Cherifi O, Chifaa A, and Tifnouti A. 1994. “Etude de regime alimentaire de cinq especes de Cladoceres dans la retenue Lalla Takerkoust”. International Journal of Limnology 30: 285-296.

Davidson NL and Kelso WE. 1997. “The exotic daphnid, Daphnia lumholtzi, in a Louisiana river-swamp”. Journal of Freshwater Ecology 12: 431-435.

Devries DR, Devries TS, and Wright RA. 2006. “Daphnia lumholtzi in the mobile river drainage, USA: invasion of a habitat that experiences salinity”. Journal of Freshwater Ecology 21: 527-530.

Engel K and Tollrian R. 2012. “Competitive ability, thermal tolerance and invasion success in exotic Daphnia lumholtzi”. Journal of Plankton Research 34: 92-97.

Havel JE and Lampert W. 2006. “Habitat partitioning of native and exotic Daphnia in gradients of temperature and food: mesocosm experiments”. Freshwater Biology 51: 487-498.

Lennon JT, Smith VH, and Williams K. 2001. “Influence of temperature on exotic Daphnia lumholtzi and implication for invasion success”. Journal of Plankton Research 23: 425-434.

Yurista PM. 2004. “Bioenergetic of a semi-tropical Cladoceran, Daphnia lumholtzi”. Journal of Freshwater Ecology 19: 681-694. JacobMwiki (talk) 05:45, 12 April 2016 (UTC)

Physiology

Being an invasive species, the physiology of D. lumholtzi is relatively well studied for a daphnid.

Respiration

D. lumholtzi individuals prefer areas with high levels of dissolved oxygen and avoid areas where oxygen levels are low. Population surveys have found robust D. lumholtzi populations in water with oxygen saturation levels ranging from 65-163%, while no populations were found in water with saturation levels ranging from 7-50% ^[1]. The mechanism D. lumholtzi uses for respiration is very similar to that used by other species of Daphnia, with gas exchange occurring through gills that are fed oxygenated water by appendages on the thorax^[2].

Response to salinity

As with most other members of the order Cladocera, D. lumholtzi lives in freshwater and is hyperosmotic to its environment^[3]. D. lumholtzi is generally found in habitats with a salinity near 0 grams per liter, but can withstand slightly saline water, up to 1.5 grams per liter, for short amounts of time ^[3]. This ability to survive short bouts of salinity has likely contributed to D. lumholtzi’s ability to invade North America^[3].

Temperature maintenance

What generally differs D. lumholtzi from most North American daphnid species is its ability to tolerate and thrive in relatively high temperatures. While most species of Daphnia see high mortality at temperatures greater than 25°C^[4], D. lumholtzi individuals can survive and reproduce at temperatures up to 30°C^[5] ^[4] ^[6], with a thermal optimum occurring at 29°C ^[5]. This ability to survive at higher temperatures in comparison to other daphnids may be a result of genetic changes in D. lumholtzi that resulted in enzymes that are better able to function in the higher temperatures of its native tropical habitats ^[7]. The lower temperature range of D. lumholtzi extends to 5°C, where some individuals are able to survive ^[5] ^[4] ^[6], with survival increasing significantly at 10°C ^[4] ^[6] and reproduction beginning to occur at 15°C ^[4] ^[6]. This significantly broad temperature range in which D. lumholtzi can survive has led to it being labeled a eurythermal species ^[7].

Ephippia stress response

D. lumholtzi, as with most daphnid species, produces eggs called ephippia when exposed to high environmental stress ^[8]. These ephippia are able to survive temperature, oxygen, and salinity levels significantly lower and higher than those hospitable to adult daphnids, although exact ranges for D. lumholtzi ephippia have not been found^[8]. This ephippia stage is an example of diapause, a state of suspended animation an organism can enter in order to survive a harsh environment ^[9]. JacobMwiki (talk) 05:25, 25 April 2016 (UTC)

Jacob, I'll reserve other comments until after you've gotten peer reviewer comments, but I would like you to format your references properly now, so that we can see what they will look like when you publish them. Also, make sure you put genus and species names in italics.Rico.schultz (talk) 17:47, 26 April 2016 (UTC)

References

[1]
Davidson, NL; Kelso, WE (1997). "The exotic daphnid, "Daphnia lumholtzi", in a Louisiana river-swamp". Journal of Freshwater Ecology. 12: 431-435. doi:10.1080/02705060.1997.9663553.
[2]
Pennak, Robert (1978). Freshwater Invertebrates of the United States. p. 454. ISBN 9780471358374.
[3]
Devries, DR; Devries, TS; Wright, RA (2006). ""Daphnia lumholtzi" in the mobile river drainage, USA: invasion of a habitat that experiences salinity". Journal of Freshwater Ecology. 21: 527-530. doi:10.1080/02705060.2006.9665031.
[4]
Lennon, JT; Smith, VH; Williams, K (2001). "Influence of temperature on exotic "Daphnia lumholtzi" and implication for invasion success". Freshwater Biology. 51: 487-498. doi:10.1093/plankt/23.4.425.
[5]
Engel, K; Tollrian, R (2012). "Competitive ability, thermal tolerance and invasion success in exotic Daphnia lumholtzi". Journal of Plankton Research. 34: 92-97. doi:10.1093/plankt/fbr083.
[6]
Havel, JE; Lampert, W (2006). "Habitat partitioning of native and exotic Daphnia in gradients of temperature and food: mesocosm experiments". Freshwater Biology. 51: 487-498. doi:10.1111/j.1365-2427.2006.01511.x.
[7]
Yurista, PM (2004). "Bioenergetic of a semi-tropical Cladoceran, Daphnia lumholtzi". Journal of Freshwater Ecology. 19: 681-694. doi:10.1080/02705060.2004.9664750.
[8]
Dzialowski, AR; O'Brien, WJ; Swaffar, SM (2000). "Range expansion and potential dispersal mechanisms of the exotic cladoceran Daphnia lumholtzi". Journal of Plankton Research. 22: 2205-2223. doi:10.1093/plankt/22.12.2205.
[9]
Wilmer, Pat; Stone, Graham; Johnston, Ian (2009). Environmental Physiology of Animals. Wiley. p. 213. ISBN 9781405107242.

Hi Jacob, I think that this is a great contribution. The references appear to be cited correctly, and the information is easy to read and comprehend. BBres96 (talk) 14:10, 27 April 2016 (UTC)

@JacobMwiki: Jacob, thanks for your thoughtful and constructive comments on Ben's Porites contribution. Rico.schultz (talk) 13:59, 29 April 2016 (UTC)