Diario del proyecto Cacti of Ontario

18 de febrero de 2024

Open Sourced Link: Consaul, L., S. Darbyshire, and A. Dugal. 1998. The status of the fragile prickly pear cactus (Opuntia fragilis) in Nepean, Ontario. Trail and Landscape 32: 175-181

Consaul, L., S. Darbyshire, and A. Dugal. 1998. The status of the fragile prickly pear cactus (Opuntia fragilis) in Nepean, Ontario. Trail and Landscape 32: 175-181

v.32:no.4 (1998)
Pages 175-181

https://archive.org/details/traillandscape32ottac/page/156/mode/1up

Publicado el febrero 18, 2024 05:05 TARDE por derekstephenhollingshead derekstephenhollingshead | 0 comentarios | Deja un comentario

12 de febrero de 2024

The importance of studying disjunct, northeastern Opuntia (Cactaceae) 🌵 distributions and populations:

  1. Biodiversity conservation: Opuntia species are an integral part of the ecosystem and contribute to the overall biodiversity of an area. Understanding their distributions and populations helps in assessing their conservation status and implementing appropriate measures for their protection.
  2. Habitat assessment: Studying the presence or absence of Opuntia species in different habitats provides insights into their habitat requirements and preferences. This information can be used to identify suitable habitats for restoration efforts or to monitor changes in the landscape that could impact their populations.
  3. Range expansion and contraction: Disjunct distributions of Opuntia species might indicate historical range expansions or contractions due to various factors such as climate change, land use practices, or natural events. By studying these distributions, researchers can gain a better understanding of the species ecological history and its response to environmental changes.
  4. Evolutionary patterns: The study of disjunct Opuntia populations can shed light on evolutionary processes such as speciation, genetic differentiation, and adaptation. By examining the genetic diversity and relationships among populations, researchers can explore the mechanisms driving their divergence and potentially uncover new insights into evolution and adaptation.
  5. Plant-insect interactions: Opuntia species often have specific interactions with certain insect species, such as their pollinators or herbivores. Studying their distributions and populations can help understand the mutual dependencies and coevolutionary dynamics between Opuntia cacti and associated insects, providing valuable insights into the functioning of ecosystems.
  6. Conservation management: Knowledge of the distributions and population dynamics of Opuntia species is crucial for effective conservation planning and management strategies. It helps identify areas of high conservation value, prioritize conservation efforts, and implement measures to mitigate threats like habitat loss, invasive species, or overexploitation.

Overall, studying disjunct, northeastern Opuntia distributions and populations allows for a better understanding of their ecological roles, evolutionary history, and conservation needs. This knowledge is essential for developing informed conservation strategies, promoting sustainable land management practices, and maintaining the long-term viability of these important cactus species.

Publicado el febrero 12, 2024 05:21 TARDE por derekstephenhollingshead derekstephenhollingshead | 0 comentarios | Deja un comentario

The Rediscovery of Opuntia polyacantha Haw. in Ontario, Canada.

The rediscovery of a reproductive population of O. polyacantha Haw. in Ontario, Canada is highly significant for several reasons. Firstly, it confirms the continued existence of this species in the region, which was previously delisted. This discovery provides valuable evidence and support for the conservation of O. polyacantha Haw.

Additionally, the rediscovery highlights the importance of thorough and accurate documentation of species. It emphasizes the need for ongoing research and monitoring efforts to ensure the preservation of biodiversity. This finding contributes to our understanding of the distribution, habitat requirements, population dynamics, and conservation status of native Opuntia cacti in Ontario.

Furthermore, the rediscovery of a reproductive population opens up possibilities for studying the genetic diversity and evolutionary history of these cacti. It allows researchers, who have otherwise dedicated their efforts to the preservation and study of cacti, to further investigate and contribute to our knowledge of these fascinating plants.

Overall, the rediscovery of a reproductive population of O. polyacantha Haw. in Ontario, Canada represents a significant milestone in our understanding and conservation of these cacti species.

Publicado el febrero 12, 2024 05:18 TARDE por derekstephenhollingshead derekstephenhollingshead | 0 comentarios | Deja un comentario

06 de noviembre de 2023

The 1882 Discovery of Opuntia rafinesquii at Point Pelee National Park

"Notes from Canada"

T J W Burgess
Published in Botanical Gazette, in 1882, in volume 7, issue 8/9, pages 95-96

https://biostor.org/reference/209928

" Notes from Canada. —

Having in the latter part of June,
made a collecting tour with my friends. Professor Macoun, Dominion Naturalist; Mr. Wm. Saunders, Editor of the Canadian Entomologist; and Mr. James Macoun, to Point Pelee, Essex Co., Ontario, the most southern point on the mainland in Canada, a list of the rarer plants found there might not be void of interest to some of the readers of the Gazette. The list is chiefly remarkable for the southern nature of most of the species enumerated, some of
them so much so, that I had not dreamed of finding them within our
boreal confines. To this locality never before having been thoroughly explored, may be attributed the seemingly extraordinary fact, that
or the plants mentioned, the first eleven have not, I believe, been
heretofore recorded as found in Canada, while the remaining ten
have but very rarely been noted.

Opuntia Rafinesquii, Eng."

Publicado el noviembre 6, 2023 01:58 TARDE por derekstephenhollingshead derekstephenhollingshead | 0 comentarios | Deja un comentario

Ontario Opuntia polyacantha Haw.

Opuntia polyacantha Haw. (Cactaceae) was previously excluded from the "Atlas of the Rare Vascular Plants of Ontario" as an unconfirmed species.

Argus, G.W., C.J. Keddy, K.M. Pryor and D.J. White. 1982-1987. Atlas of the Rare Vascular Plants of Ontario, G.W. Argus & D.J. White (eds.). National Museum of
Natural Sciences, Botany Division, Ottawa, Ont.

"Excluded species of Cactaceae / Espèces de Cactaceae exclues

J/SI - unconfirmed/situation incertaine

USI Opuntia polyacantha Haw."

https://www.biodiversitylibrary.org/item/109262#page/224/mode/1up

Publicado el noviembre 6, 2023 01:55 TARDE por derekstephenhollingshead derekstephenhollingshead | 0 comentarios | Deja un comentario

03 de diciembre de 2022

Cacti of Ontario

Ontario has 2 native species of cacti have have been observed since the late 1800s:

Both Opuntia cespitosa (formerly humifusa) and Opuntia fragilis.

Elements of Opuntia cymochila Engelm & Big. have been observed as introduced into a southern Ontario locality as early as the 1940's as per comm. Allan Woodliffe & Michael J. Oldham. Determinations were made by both Lucas Majure and myself, Derek Stephen Hollingshead, regarding Anthony Reznicek's herbarium submissions; made to MICH in the 1980s. Both corresponding samples appear as O. cymochila Engelm. and Big. not O. humifusa Raf.

Elements of an introduced species displaying spinal characteristics consistent with O. macrohiza have been observed as early as 2009. Although similar occurrences are likely byproducts of human introduction and Ontario's commercial horticulture industry, I propose the use of the taxonomy O. macrorhiza Engelm. & Big (Oldham) to describe them. After retire provincial botanist Michael J Oldham, first to collect and submit herbarium samples of a specimen.

Lastly, in 2018 a population of O. polyacantha was discovered in eastern Ontario. The origins of this population have yet to be formally determined. The presence of this species is notable for being over 1800km removed from its next closest element. Multiple colonies have been observed in 2 distinct sub populations. Both populations reproduce by means of pad detachment and seed dispersals.

Publicado el diciembre 3, 2022 01:56 MAÑANA por derekstephenhollingshead derekstephenhollingshead | 0 comentarios | Deja un comentario

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