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Araba Bioscan

Araba Bioscan 20-27 November 2020 (New location)

This was the first week running a Malaise trap at the new location selected for the remainder of the project. It was operated in parallel with the original Malaise trap (just 10 m further north). For the results from the original trap, see Araba Bioscan 20-27 November 2020 (Original location).

The new position is slightly higher up a slope and less screened by vegetation on the lower side. Differences in air movements and sight lines presumably contributed to such a massive discrepancy in insect volumes.

Termites swarmed on Saturday 21 and Sunday 21 November and were well represented in both traps. The new trap however caught much greater biomass and many more species, particularly Diptera and Hymenoptera. A selection of the more conspicuous or striking species are illustrated.

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Araba Bioscan

Araba Bioscan 20-27 November 2020 (Original location)

This was the final week operating a trap at the original location. A second Malaise trap was run in parallel this week around 10 m away and caught a much wider range of species – see the following post.

There was a swarming of termites on Saturday 21 and Sunday 22 November and the bulk of insects in this trap were from this event.

The collecting medium was 95% isopropyl alcohol.

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Araba Bioscan

Araba Bioscan 13-20 November 2020

As with recent weeks, a relatively low number and diversity of insects (particularly when compared with the five-day test of a SLAM trap around 10 m away.

Over the next week, I will compare the current Malaise trap location with another Malaise trap located near the position used for the SLAM trap.

The collecting medium was 95% isopropyl alcohol.

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Araba Bioscan

Araba Bioscan SLAM comparison 15-19 November 2020

SLAM trap
SLAM trap positioned for comparison with Malaise trap in the period 15-19 November 2020

There has been a noticeable imbalance in the insects collected in the Araba Bioscan Malaise trap to date. The vast majority of larger insects have been moths, with rather few flies or wasps. This week, I chose to add a second trap (a SLAM trap which operates like a small Malaise trap with four access quadrants instead of two sides) positioned around 10 m away in slightly more exposed spot. This page provides an overview of the material caught in this trap. The balance was very different with many more beetles, including three Euomma lateralis Boheman, 1858 (Tenebrionidae: Alleculinae) and one Pterohelaeus striatopunctatus Boisduval 1835 (Tenebrionidae: Tenebrioninae), and cockroaches, including one Robshelfordia circumducta (Walker, 1869) and seven Johnrehnia concisa (Walker, 1871) (both Ectobiidae: Blatellinae), and a larger number of insects overall. This was despite this trap only being deployed for less than five complete days.

This has encouraged me to set up a second Malaise trap in the position used for the SLAM trap and to compare this in the coming week with the original trap. Assuming a greater diversity of insects also occurs in the new Malaise trap, I will decommission the first one and effectively restart the clock on the project.

The collecting medium was 95% isopropyl alcohol.

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Araba Bioscan

Araba Bioscan 6-13 November 2020

It was much warmer than last week and this was reflected in a greatly increased number of insects in the Malaise trap, particularly gelechioid moths. Philobota cretacea Meyrick, 1884 was noted last week as recorded for the first time at the site despite years of recording moths at light. This week, two more were collected.

I have photographed a selection of flies, including three separate Muscoidea. These vary in size, wing markings and leg colouration. Images 3a, 3b, 3c and 4 illustrate two individuals of a larger species of Muscidae with wing spots. Images, 5, 6, and 7 show three individuals of a smaller species of Muscidae with plainer wings and yellow tarsi. Based on material in BOLD, this seems to be a common species widely collected and clustered as BIN BOLD:AAU5065. Images 8a and 8b illustrate an individual apparently of Anthomyiidae with plain wings and orange-brown front femurs. Thanks again to tony_d on iNaturalist for assistance with these flies.

The collecting medium was 95% isopropyl alcohol.

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Araba Bioscan

Araba Bioscan 30 October to 6 November 2020

This was a cold week and very wet. On 1 November, no point in the whole 24-hour period was as warm as midnight at the start.

The moths captured included several of the small oecophorid Hoplostega ochroma (Meyrick, 1886), as well as the first record for the site of Philobota cretacea Meyrick, 1884. This latter species had not been recorded from light trapping at the site.

Thanks to Frans Janssens@www.collembola.org for the springtail identification, Boris Büche on iNaturalist for the Aderidae identification, Nigel Main on iNaturalist for the ant genus identifications, and tonyd on iNaturalist for multiple fly identifications.

The collecting medium was 95% isopropyl alcohol.

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Miscellaneous

Memes and phenotypes: Re-evaluating the role of taxonomy

A contribution to Dawkins studies

I’m not going to waste time putting this somewhere else, so I thought I might as well put it here …

Taxonomy is normally positioned as a long-running international research effort to recognise and delimit unique evolutionary lineages, describe and name these as species, and organise species within a hierarchical framework of higher taxa. Scientific names are accordingly seen as tools to facilitate human understanding, use and management of biodiversity. However, evolutionary biology reveals the inadequacy of this reductive and overly anthropocentric perspective. Scientific names are better understood as part of the extended phenotype (Dawkins, 1982) of many biological organisms, serving as avatars for collectives of these organisms to form and manipulate symbioses with Homo sapiens. These symbioses are mediated through the ability of these organisms to establish and control memes (Dawkins, 1976) that infect and penetrate human culture. Scientific names are the binding points that allow these memes to become established.

The process by which scientific names infect human consciousness is not dissimilar to mechanisms used by many parasitic organisms to infect their hosts. Scientific names are established when organisms successfully attract the attention of a susceptible and suitable human host. Most humans have some initial susceptibility, provided that the organisms are able to stimulate sufficient interest to become memorable to the infected individual. However, only a small subset of potential hosts is suitable as a vehicle for wider transmission of this interest. Taxonomists serve as the primary hosts that are suitable for transmitting the infection more widely through their activity in publishing species treatments and scientific names. A broader subset of humans, including naturalists and nature lovers, may serve as intermediate hosts that transmit interest in unrecognised organisms to a suitable taxonomist. The infection becomes established as a published scientific name is adopted and reused within the scientific community. In some cases, the infection reaches epidemic levels when the wider human population develops an interest in the species. Modern social media serve as the leading pathway for global infection.

The relationship between any scientific name and an evolutionary lineage is more or less coincidental. Multiple and even unrelated lineages may share characteristics that hamper human recognition and discrimination. This allows such organisms to form mimicry rings that may never or only belatedly be recognised as swarms of cryptic species. Over time, advances in human technology and scientific method have disrupted many of these mimicry rings, effectively modifying the environment within which organisms must maintain the memes associated with their scientific names. This changing environment drives evolution in the membership of the organism collectives that taxonomists recognise as species. This evolution has an epiphenomenal presentation to human observers as a proliferation of species concepts associated with each scientific name.

Scientific names vary in their efficiency and infectiousness as tools for meme propagation. Factors such as euphony and memorability (including the familiarity of name elements to humans) may affect the wider transmission and persistence of a name within the consciousness of the community. 

As part of the extended phenotype of the associated organisms, scientific names support a vast network of symbioses between the world’s species and the human race. Most significantly, the memes tied to each scientific name may increase the reproductive fitness of a species by promoting and facilitating its trade and cultivation by humans, for example via the pet and aquarium trade and in the context of agriculture, horticulture and animal husbandry. In some cases, these memes can trigger the activation of human defence mechanisms, as for example when species are included in lists of undesirable pest or invasive organisms. However, some species may be successful in exploiting memes associated with their scientific names to avert human predation or exploitation (a form of aposematism) and even to elicit heightened human social responses (homologous to brood parasitism) and secure potentially significant assistance in the form of conservation or cultivation.

Some observers (e.g. Garnett and Christidis, 2017) have noted that certain organisms are disproportionately effective in propagating favourable memes and exploiting human responses. Those organisms that appear most charismatic to humans are most successful in parasitising human energy to support their conservation. In extreme cases, the heightened stimuli that these organism collectives present to taxonomists and the wider public trigger the splitting of an existing named collective into multiple named species. Each additional scientific name serves as a new avatar for the organisms to secure additional support and funding. Garnett and Christidis are concerned that such organisms have gamed human interest to a disproportionate extent and divert global resources from other species or components of the environment.

We should recognise that some scientific names are “sock puppets” that serve to deceive humans and subvert the perceived goals of the taxonomic community, conservation organisations and other stakeholders. Better governance mechanisms are required to inoculate the taxonomic community against super-charismatic taxa and protect the wider community from exploitation by these organisms.

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Miscellaneous

Parental investment and edited volumes

A random piece I found I wrote back in 2009 …

A few years ago I picked up a few volumes from the Oxford Series in Ecology and Evolution in a book sale. One of these was The Evolution of Sibling Rivalry by Douglas W. Mock and Geoffrey A. Parker. (Another excellent volume was Biological Invasions: Theory and Practice by Nanako Shigesada and Kohkichi Kawasaki – even if the title suggests a how-to manual for bioterrorists.)

Mock and Parker cover their subject in great detail and in a highly readable fashion. One area in particular struck me as having wider application. One of the conclusions summarised in chapter 10 reads:

Where PI (parental investment) is contributed by both parents, most taxa should exhibit ‘sexual conflict’ over how much each contributes. ESS (evolutionary stable strategy) models of biparental care make the paradoxical prediction of less PI per offspring than under uniparental care (or an idealized ‘true monogamy’, wherein partners mate for life). In a biparental situation, if one mate unilaterally lowers its share of the load, its partner should compensate partially (thereby buffering the offspring from the full force of the uniparental deprivation), but not fully (i.e. not so as to make up for the total cut-back), unless there is true monogamy. The implications for sibling rivalry are clear. Selfish games between the care-givers can shrink the ‘cake’ on which the offspring depend, thereby accentuating their own incentives for selfishness. Some recent field studies of European songbirds provide some support for these and related predictions.

The Evolution of Sibling Rivalry, p.231

This seems to apply very nicely to my experience in reading a range of volumes from individual authors (or small numbers of co-authors) and comparing them with edited volumes each with many authors. In nearly all cases, the overall quality of a book and the benefit derived from reading it (and often more mundane aspects such as the quality of the proof-reading) seems proportional to the number of authors. Of course there are likely to be several contributing factors. A single author has the ability to develop arguments and draw connections between different topics in ways which are much harder for multiple authors. Nevertheless I suspect that authors arrive at a very similar stable strategy to that realised by European songbirds. To rephrase one of the sentences above:

In a multi-author situation, if one author unilaterally lowers its share of the load, the co-authors should compensate partially (thereby buffering the volume from the full force of the author’s dereliction), but not fully (i.e. not so as to make up for the total cut-back), unless there is a (stable, long-term) partnership between the authors.

Certainly not an earth-shattering insight, but one that is, I am sure, applicable in many areas of work and life.

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Araba Bioscan

Araba Bioscan 23-30 October 2020

This was the first week of sampling in the Araba Bioscan Project, using 95% isopropyl alcohol as the collecting medium. A sensor for temperature and humidity was attached to the Malaise trap part way through the week, along with a soil moisture sensor immediately under the trap. Barometric pressure is measured about 10 m away and other environmental measurements will be collected in subsequent weeks.

Spring has been wet here in Canberra, following a number of years of low rainfall. The surrounding woodland is currently full of flowers, including very large numbers of tiger orchids (Diuris sulphurea R.Br.).

The Malaise sample included a surprising number (to me, at least) of springtails (Collembola).

The only neuropteran species captured was the common brown lacewing (Hemerobiidae) Micromus tasmaniae (Walker, 1860). All four individuals of this species are illustrated below.

Thanks to tony_d on iNaturalist for the identification of Sphenella ruficeps (Macquart, 1851) and other flies.